Java > Open Source Codes > org > apache > axis > types > URI


1   /*
2    * Copyright 1999-2004 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.axis.types;
18  
19  import java.io.IOException  ;
20  import java.io.Serializable  ;
21  
22  /**********************************************************************
23  * <i>Axis Note: This class was 'borrowed' from Xerces 2:
24   * org.apache.xerces.util.URI.java, version 1.22 </i>
25  * <p>
26  * A class to represent a Uniform Resource Identifier (URI). This class
27  * is designed to handle the parsing of URIs and provide access to
28  * the various components (scheme, host, port, userinfo, path, query
29  * string and fragment) that may constitute a URI.
30  * <p>
31  * Parsing of a URI specification is done according to the URI
32  * syntax described in 
33  * <a HREF="http://www.ietf.org/rfc/rfc2396.txt?number=2396">RFC 2396</a>,
34  * and amended by
35  * <a HREF="http://www.ietf.org/rfc/rfc2732.txt?number=2732">RFC 2732</a>. 
36  * <p>
37  * Every absolute URI consists of a scheme, followed by a colon (':'), 
38  * followed by a scheme-specific part. For URIs that follow the 
39  * "generic URI" syntax, the scheme-specific part begins with two 
40  * slashes ("//") and may be followed by an authority segment (comprised 
41  * of user information, host, and port), path segment, query segment 
42  * and fragment. Note that RFC 2396 no longer specifies the use of the 
43  * parameters segment and excludes the "user:password" syntax as part of 
44  * the authority segment. If "user:password" appears in a URI, the entire 
45  * user/password string is stored as userinfo.
46  * <p>
47  * For URIs that do not follow the "generic URI" syntax (e.g. mailto),
48  * the entire scheme-specific part is treated as the "path" portion
49  * of the URI.
50  * <p>
51  * Note that, unlike the java.net.URL class, this class does not provide
52  * any built-in network access functionality nor does it provide any
53  * scheme-specific functionality (for example, it does not know a
54  * default port for a specific scheme). Rather, it only knows the
55  * grammar and basic set of operations that can be applied to a URI.
56  *
57  **********************************************************************/
58   public class URI implements Serializable   {
59  
60    /*******************************************************************
61    * MalformedURIExceptions are thrown in the process of building a URI
62    * or setting fields on a URI when an operation would result in an
63    * invalid URI specification.
64    *
65    ********************************************************************/
66    public static class MalformedURIException extends IOException   {
67  
68     /** Serialization version. */
69     static final long serialVersionUID = -6695054834342951930L;
70     
71     /******************************************************************
72      * Constructs a <code>MalformedURIException</code> with no specified
73      * detail message.
74      ******************************************************************/
75      public MalformedURIException() {
76        super();
77      }
78  
79      /*****************************************************************
80      * Constructs a <code>MalformedURIException</code> with the
81      * specified detail message.
82      *
83      * @param p_msg the detail message.
84      ******************************************************************/
85      public MalformedURIException(String   p_msg) {
86        super(p_msg);
87      }
88    }
89  
90    /** Serialization version. */
91    static final long serialVersionUID = 1601921774685357214L;
92  
93    private static final byte [] fgLookupTable = new byte[128];
94    
95    /**
96     * Character Classes
97     */
98    
99    /** reserved characters ;/?:@&=+$,[] */
100   //RFC 2732 added '[' and ']' as reserved characters
101   private static final int RESERVED_CHARACTERS = 0x01;
102   
103   /** URI punctuation mark characters: -_.!~*'() - these, combined with
104       alphanumerics, constitute the "unreserved" characters */
105   private static final int MARK_CHARACTERS = 0x02;
106   
107   /** scheme can be composed of alphanumerics and these characters: +-. */
108   private static final int SCHEME_CHARACTERS = 0x04;
109   
110   /** userinfo can be composed of unreserved, escaped and these
111       characters: ;:&=+$, */
112   private static final int USERINFO_CHARACTERS = 0x08;
113   
114   /** ASCII letter characters */
115   private static final int ASCII_ALPHA_CHARACTERS = 0x10;
116   
117   /** ASCII digit characters */
118   private static final int ASCII_DIGIT_CHARACTERS = 0x20;
119   
120   /** ASCII hex characters */
121   private static final int ASCII_HEX_CHARACTERS = 0x40;
122   
123   /** Path characters */
124   private static final int PATH_CHARACTERS = 0x80;
125 
126   /** Mask for alpha-numeric characters */
127   private static final int MASK_ALPHA_NUMERIC = ASCII_ALPHA_CHARACTERS | ASCII_DIGIT_CHARACTERS;
128   
129   /** Mask for unreserved characters */
130   private static final int MASK_UNRESERVED_MASK = MASK_ALPHA_NUMERIC | MARK_CHARACTERS;
131   
132   /** Mask for URI allowable characters except for % */
133   private static final int MASK_URI_CHARACTER = MASK_UNRESERVED_MASK | RESERVED_CHARACTERS;
134   
135   /** Mask for scheme characters */
136   private static final int MASK_SCHEME_CHARACTER = MASK_ALPHA_NUMERIC | SCHEME_CHARACTERS;
137   
138   /** Mask for userinfo characters */
139   private static final int MASK_USERINFO_CHARACTER = MASK_UNRESERVED_MASK | USERINFO_CHARACTERS;
140   
141   /** Mask for path characters */
142   private static final int MASK_PATH_CHARACTER = MASK_UNRESERVED_MASK | PATH_CHARACTERS; 
143 
144   static {
145       // Add ASCII Digits and ASCII Hex Numbers
146       for (int i = '0'; i <= '9'; ++i) {
147           fgLookupTable[i] |= ASCII_DIGIT_CHARACTERS | ASCII_HEX_CHARACTERS;
148       }
149 
150       // Add ASCII Letters and ASCII Hex Numbers
151       for (int i = 'A'; i <= 'F'; ++i) {
152           fgLookupTable[i] |= ASCII_ALPHA_CHARACTERS | ASCII_HEX_CHARACTERS;
153           fgLookupTable[i+0x00000020] |= ASCII_ALPHA_CHARACTERS | ASCII_HEX_CHARACTERS;
154       }
155 
156       // Add ASCII Letters
157       for (int i = 'G'; i <= 'Z'; ++i) {
158           fgLookupTable[i] |= ASCII_ALPHA_CHARACTERS;
159           fgLookupTable[i+0x00000020] |= ASCII_ALPHA_CHARACTERS;
160       }
161 
162       // Add Reserved Characters
163       fgLookupTable[';'] |= RESERVED_CHARACTERS;
164       fgLookupTable['/'] |= RESERVED_CHARACTERS;
165       fgLookupTable['?'] |= RESERVED_CHARACTERS;
166       fgLookupTable[':'] |= RESERVED_CHARACTERS;
167       fgLookupTable['@'] |= RESERVED_CHARACTERS;
168       fgLookupTable['&'] |= RESERVED_CHARACTERS;
169       fgLookupTable['='] |= RESERVED_CHARACTERS;
170       fgLookupTable['+'] |= RESERVED_CHARACTERS;
171       fgLookupTable['$'] |= RESERVED_CHARACTERS;
172       fgLookupTable[','] |= RESERVED_CHARACTERS;
173       fgLookupTable['['] |= RESERVED_CHARACTERS;
174       fgLookupTable[']'] |= RESERVED_CHARACTERS;
175 
176       // Add Mark Characters
177       fgLookupTable['-'] |= MARK_CHARACTERS;
178       fgLookupTable['_'] |= MARK_CHARACTERS;
179       fgLookupTable['.'] |= MARK_CHARACTERS;
180       fgLookupTable['!'] |= MARK_CHARACTERS;
181       fgLookupTable['~'] |= MARK_CHARACTERS;
182       fgLookupTable['*'] |= MARK_CHARACTERS;
183       fgLookupTable['\''] |= MARK_CHARACTERS;
184       fgLookupTable['('] |= MARK_CHARACTERS;
185       fgLookupTable[')'] |= MARK_CHARACTERS;
186 
187       // Add Scheme Characters
188       fgLookupTable['+'] |= SCHEME_CHARACTERS;
189       fgLookupTable['-'] |= SCHEME_CHARACTERS;
190       fgLookupTable['.'] |= SCHEME_CHARACTERS;
191 
192       // Add Userinfo Characters
193       fgLookupTable[';'] |= USERINFO_CHARACTERS;
194       fgLookupTable[':'] |= USERINFO_CHARACTERS;
195       fgLookupTable['&'] |= USERINFO_CHARACTERS;
196       fgLookupTable['='] |= USERINFO_CHARACTERS;
197       fgLookupTable['+'] |= USERINFO_CHARACTERS;
198       fgLookupTable['$'] |= USERINFO_CHARACTERS;
199       fgLookupTable[','] |= USERINFO_CHARACTERS;
200       
201       // Add Path Characters
202       fgLookupTable[';'] |= PATH_CHARACTERS;
203       fgLookupTable['/'] |= PATH_CHARACTERS;
204       fgLookupTable[':'] |= PATH_CHARACTERS;
205       fgLookupTable['@'] |= PATH_CHARACTERS;
206       fgLookupTable['&'] |= PATH_CHARACTERS;
207       fgLookupTable['='] |= PATH_CHARACTERS;
208       fgLookupTable['+'] |= PATH_CHARACTERS;
209       fgLookupTable['$'] |= PATH_CHARACTERS;
210       fgLookupTable[','] |= PATH_CHARACTERS;
211   }
212 
213   /** Stores the scheme (usually the protocol) for this URI. */
214   private String   m_scheme = null;
215 
216   /** If specified, stores the userinfo for this URI; otherwise null */
217   private String   m_userinfo = null;
218 
219   /** If specified, stores the host for this URI; otherwise null */
220   private String   m_host = null;
221 
222   /** If specified, stores the port for this URI; otherwise -1 */
223   private int m_port = -1;
224   
225   /** If specified, stores the registry based authority for this URI; otherwise -1 */
226   private String   m_regAuthority = null;
227 
228   /** If specified, stores the path for this URI; otherwise null */
229   private String   m_path = null;
230 
231   /** If specified, stores the query string for this URI; otherwise
232       null.  */
233   private String   m_queryString = null;
234 
235   /** If specified, stores the fragment for this URI; otherwise null */
236   private String   m_fragment = null;
237 
238   private static boolean DEBUG = false;
239 
240   /**
241   * Construct a new and uninitialized URI.
242   */
243   public URI() {
244   }
245 
246  /**
247   * Construct a new URI from another URI. All fields for this URI are
248   * set equal to the fields of the URI passed in.
249   *
250   * @param p_other the URI to copy (cannot be null)
251   */
252   public URI(URI p_other) {
253     initialize(p_other);
254   }
255 
256  /**
257   * Construct a new URI from a URI specification string. If the
258   * specification follows the "generic URI" syntax, (two slashes
259   * following the first colon), the specification will be parsed
260   * accordingly - setting the scheme, userinfo, host,port, path, query
261   * string and fragment fields as necessary. If the specification does
262   * not follow the "generic URI" syntax, the specification is parsed
263   * into a scheme and scheme-specific part (stored as the path) only.
264   *
265   * @param p_uriSpec the URI specification string (cannot be null or
266   *                  empty)
267   *
268   * @exception MalformedURIException if p_uriSpec violates any syntax
269   *                                   rules
270   */
271   public URI(String   p_uriSpec) throws MalformedURIException {
272     this((URI)null, p_uriSpec);
273   }
274 
275  /**
276    * Construct a new URI from a URI specification string. If the
277    * specification follows the "generic URI" syntax, (two slashes
278    * following the first colon), the specification will be parsed
279    * accordingly - setting the scheme, userinfo, host,port, path, query
280    * string and fragment fields as necessary. If the specification does
281    * not follow the "generic URI" syntax, the specification is parsed
282    * into a scheme and scheme-specific part (stored as the path) only.
283    * Construct a relative URI if boolean is assigned to "true"
284    * and p_uriSpec is not valid absolute URI, instead of throwing an exception. 
285    * 
286    * @param p_uriSpec the URI specification string (cannot be null or
287    *                  empty)
288    * @param allowNonAbsoluteURI true to permit non-absolute URIs, 
289    *                            false otherwise.
290    *
291    * @exception MalformedURIException if p_uriSpec violates any syntax
292    *                                   rules
293    */
294   public URI(String   p_uriSpec, boolean allowNonAbsoluteURI) throws MalformedURIException {
295       this((URI)null, p_uriSpec, allowNonAbsoluteURI);
296   }
297   
298  /**
299   * Construct a new URI from a base URI and a URI specification string.
300   * The URI specification string may be a relative URI.
301   *
302   * @param p_base the base URI (cannot be null if p_uriSpec is null or
303   *               empty)
304   * @param p_uriSpec the URI specification string (cannot be null or
305   *                  empty if p_base is null)
306   *
307   * @exception MalformedURIException if p_uriSpec violates any syntax
308   *                                  rules
309   */
310   public URI(URI p_base, String   p_uriSpec) throws MalformedURIException {
311     initialize(p_base, p_uriSpec);
312   }
313 
314  /**
315    * Construct a new URI from a base URI and a URI specification string.
316    * The URI specification string may be a relative URI.
317    * Construct a relative URI if boolean is assigned to "true"
318    * and p_uriSpec is not valid absolute URI and p_base is null
319    * instead of throwing an exception. 
320    *
321    * @param p_base the base URI (cannot be null if p_uriSpec is null or
322    *               empty)
323    * @param p_uriSpec the URI specification string (cannot be null or
324    *                  empty if p_base is null)
325    * @param allowNonAbsoluteURI true to permit non-absolute URIs, 
326    *                            false otherwise.
327    *
328    * @exception MalformedURIException if p_uriSpec violates any syntax
329    *                                  rules
330    */
331   public URI(URI p_base, String   p_uriSpec, boolean allowNonAbsoluteURI) throws MalformedURIException {
332       initialize(p_base, p_uriSpec, allowNonAbsoluteURI);
333   }
334 
335  /**
336   * Construct a new URI that does not follow the generic URI syntax.
337   * Only the scheme and scheme-specific part (stored as the path) are
338   * initialized.
339   *
340   * @param p_scheme the URI scheme (cannot be null or empty)
341   * @param p_schemeSpecificPart the scheme-specific part (cannot be
342   *                             null or empty)
343   *
344   * @exception MalformedURIException if p_scheme violates any
345   *                                  syntax rules
346   */
347   public URI(String   p_scheme, String   p_schemeSpecificPart)
348              throws MalformedURIException {
349     if (p_scheme == null || p_scheme.trim().length() == 0) {
350       throw new MalformedURIException(
351             "Cannot construct URI with null/empty scheme!");
352     }
353     if (p_schemeSpecificPart == null ||
354         p_schemeSpecificPart.trim().length() == 0) {
355       throw new MalformedURIException(
356           "Cannot construct URI with null/empty scheme-specific part!");
357     }
358     setScheme(p_scheme);
359     setPath(p_schemeSpecificPart);
360   }
361 
362  /**
363   * Construct a new URI that follows the generic URI syntax from its
364   * component parts. Each component is validated for syntax and some
365   * basic semantic checks are performed as well.  See the individual
366   * setter methods for specifics.
367   *
368   * @param p_scheme the URI scheme (cannot be null or empty)
369   * @param p_host the hostname, IPv4 address or IPv6 reference for the URI
370   * @param p_path the URI path - if the path contains '?' or '#',
371   *               then the query string and/or fragment will be
372   *               set from the path; however, if the query and
373   *               fragment are specified both in the path and as
374   *               separate parameters, an exception is thrown
375   * @param p_queryString the URI query string (cannot be specified
376   *                      if path is null)
377   * @param p_fragment the URI fragment (cannot be specified if path
378   *                   is null)
379   *
380   * @exception MalformedURIException if any of the parameters violates
381   *                                  syntax rules or semantic rules
382   */
383   public URI(String   p_scheme, String   p_host, String   p_path,
384              String   p_queryString, String   p_fragment)
385          throws MalformedURIException {
386     this(p_scheme, null, p_host, -1, p_path, p_queryString, p_fragment);
387   }
388 
389  /**
390   * Construct a new URI that follows the generic URI syntax from its
391   * component parts. Each component is validated for syntax and some
392   * basic semantic checks are performed as well.  See the individual
393   * setter methods for specifics.
394   *
395   * @param p_scheme the URI scheme (cannot be null or empty)
396   * @param p_userinfo the URI userinfo (cannot be specified if host
397   *                   is null)
398   * @param p_host the hostname, IPv4 address or IPv6 reference for the URI
399   * @param p_port the URI port (may be -1 for "unspecified"; cannot
400   *               be specified if host is null)
401   * @param p_path the URI path - if the path contains '?' or '#',
402   *               then the query string and/or fragment will be
403   *               set from the path; however, if the query and
404   *               fragment are specified both in the path and as
405   *               separate parameters, an exception is thrown
406   * @param p_queryString the URI query string (cannot be specified
407   *                      if path is null)
408   * @param p_fragment the URI fragment (cannot be specified if path
409   *                   is null)
410   *
411   * @exception MalformedURIException if any of the parameters violates
412   *                                  syntax rules or semantic rules
413   */
414   public URI(String   p_scheme, String   p_userinfo,
415              String   p_host, int p_port, String   p_path,
416              String   p_queryString, String   p_fragment)
417          throws MalformedURIException {
418     if (p_scheme == null || p_scheme.trim().length() == 0) {
419       throw new MalformedURIException("Scheme is required!");
420     }
421 
422     if (p_host == null) {
423       if (p_userinfo != null) {
424         throw new MalformedURIException(
425              "Userinfo may not be specified if host is not specified!");
426       }
427       if (p_port != -1) {
428         throw new MalformedURIException(
429              "Port may not be specified if host is not specified!");
430       }
431     }
432 
433     if (p_path != null) {
434       if (p_path.indexOf('?') != -1 && p_queryString != null) {
435         throw new MalformedURIException(
436           "Query string cannot be specified in path and query string!");
437       }
438 
439       if (p_path.indexOf('#') != -1 && p_fragment != null) {
440         throw new MalformedURIException(
441           "Fragment cannot be specified in both the path and fragment!");
442       }
443     }
444 
445     setScheme(p_scheme);
446     setHost(p_host);
447     setPort(p_port);
448     setUserinfo(p_userinfo);
449     setPath(p_path);
450     setQueryString(p_queryString);
451     setFragment(p_fragment);
452   }
453 
454  /**
455   * Initialize all fields of this URI from another URI.
456   *
457   * @param p_other the URI to copy (cannot be null)
458   */
459   private void initialize(URI p_other) {
460     m_scheme = p_other.getScheme();
461     m_userinfo = p_other.getUserinfo();
462     m_host = p_other.getHost();
463     m_port = p_other.getPort();
464     m_regAuthority = p_other.getRegBasedAuthority();
465     m_path = p_other.getPath();
466     m_queryString = p_other.getQueryString();
467     m_fragment = p_other.getFragment();
468   }
469 
470  /**
471   * Initializes this URI from a base URI and a URI specification string.
472   * See RFC 2396 Section 4 and Appendix B for specifications on parsing
473   * the URI and Section 5 for specifications on resolving relative URIs
474   * and relative paths.
475   *
476   * @param p_base the base URI (may be null if p_uriSpec is an absolute
477   *               URI)
478   * @param p_uriSpec the URI spec string which may be an absolute or
479   *                  relative URI (can only be null/empty if p_base
480   *                  is not null)
481    * @param allowNonAbsoluteURI true to permit non-absolute URIs, 
482    *                         in case of relative URI, false otherwise.
483    *
484    * @exception MalformedURIException if p_base is null and p_uriSpec
485    *                                  is not an absolute URI or if
486    *                                  p_uriSpec violates syntax rules
487    */
488   private void initialize(URI p_base, String   p_uriSpec, boolean allowNonAbsoluteURI)
489       throws MalformedURIException {
490       
491       String   uriSpec = p_uriSpec;
492       int uriSpecLen = (uriSpec != null) ? uriSpec.length() : 0;
493       
494       if (p_base == null && uriSpecLen == 0) {
495           if (allowNonAbsoluteURI) {
496               m_path = "";
497               return;
498           }
499           throw new MalformedURIException("Cannot initialize URI with empty parameters.");
500       }
501       
502       // just make a copy of the base if spec is empty
503       if (uriSpecLen == 0) {
504           initialize(p_base);
505           return;
506       }
507       
508       int index = 0;
509       
510       // Check for scheme, which must be before '/', '?' or '#'.
511       int colonIdx = uriSpec.indexOf(':');
512       if (colonIdx != -1) {
513           final int searchFrom = colonIdx - 1;
514           // search backwards starting from character before ':'.
515           int slashIdx = uriSpec.lastIndexOf('/', searchFrom);
516           int queryIdx = uriSpec.lastIndexOf('?', searchFrom);
517           int fragmentIdx = uriSpec.lastIndexOf('#', searchFrom);
518           
519           if (colonIdx == 0 || slashIdx != -1 || 
520               queryIdx != -1 || fragmentIdx != -1) {
521               // A standalone base is a valid URI according to spec
522               if (colonIdx == 0 || (p_base == null && fragmentIdx != 0 && !allowNonAbsoluteURI)) {
523                   throw new MalformedURIException("No scheme found in URI.");
524               }
525           }
526           else {
527               initializeScheme(uriSpec);
528               index = m_scheme.length()+1;
529               
530               // Neither 'scheme:' or 'scheme:#fragment' are valid URIs.
531               if (colonIdx == uriSpecLen - 1 || uriSpec.charAt(colonIdx+1) == '#') {
532                   throw new MalformedURIException("Scheme specific part cannot be empty.");   
533               }
534           }
535       }
536       else if (p_base == null && uriSpec.indexOf('#') != 0 && !allowNonAbsoluteURI) {
537           throw new MalformedURIException("No scheme found in URI.");    
538       }
539       
540       // Two slashes means we may have authority, but definitely means we're either
541       // matching net_path or abs_path. These two productions are ambiguous in that
542       // every net_path (except those containing an IPv6Reference) is an abs_path. 
543       // RFC 2396 resolves this ambiguity by applying a greedy left most matching rule. 
544       // Try matching net_path first, and if that fails we don't have authority so 
545       // then attempt to match abs_path.
546       //
547       // net_path = "//" authority [ abs_path ]
548       // abs_path = "/"  path_segments
549       if (((index+1) < uriSpecLen) &&
550           (uriSpec.charAt(index) == '/' && uriSpec.charAt(index+1) == '/')) {
551           index += 2;
552           int startPos = index;
553           
554           // Authority will be everything up to path, query or fragment
555           char testChar = '\0';
556           while (index < uriSpecLen) {
557               testChar = uriSpec.charAt(index);
558               if (testChar == '/' || testChar == '?' || testChar == '#') {
559                   break;
560               }
561               index++;
562           }
563           
564           // Attempt to parse authority. If the section is an empty string
565           // this is a valid server based authority, so set the host to this
566           // value.
567           if (index > startPos) {
568               // If we didn't find authority we need to back up. Attempt to
569               // match against abs_path next.
570               if (!initializeAuthority(uriSpec.substring(startPos, index))) {
571                   index = startPos - 2;
572               }
573           }
574           else {
575               m_host = "";
576           }
577       }
578       
579       initializePath(uriSpec, index);
580       
581       // Resolve relative URI to base URI - see RFC 2396 Section 5.2
582       // In some cases, it might make more sense to throw an exception
583       // (when scheme is specified is the string spec and the base URI
584       // is also specified, for example), but we're just following the
585       // RFC specifications
586       if (p_base != null) {
587           absolutize(p_base);
588       }
589   }
590 
591  /**
592   * Initializes this URI from a base URI and a URI specification string.
593   * See RFC 2396 Section 4 and Appendix B for specifications on parsing
594   * the URI and Section 5 for specifications on resolving relative URIs
595   * and relative paths.
596   *
597   * @param p_base the base URI (may be null if p_uriSpec is an absolute
598   *               URI)
599   * @param p_uriSpec the URI spec string which may be an absolute or
600   *                  relative URI (can only be null/empty if p_base
601   *                  is not null)
602   *
603   * @exception MalformedURIException if p_base is null and p_uriSpec
604   *                                  is not an absolute URI or if
605   *                                  p_uriSpec violates syntax rules
606   */
607   private void initialize(URI p_base, String   p_uriSpec)
608                          throws MalformedURIException {
609       
610     String   uriSpec = p_uriSpec;
611     int uriSpecLen = (uriSpec != null) ? uriSpec.length() : 0;
612     
613     if (p_base == null && uriSpecLen == 0) {
614       throw new MalformedURIException(
615                   "Cannot initialize URI with empty parameters.");
616     }
617 
618     // just make a copy of the base if spec is empty
619     if (uriSpecLen == 0) {
620       initialize(p_base);
621       return;
622     }
623 
624     int index = 0;
625 
626     // Check for scheme, which must be before '/', '?' or '#'.
627     int colonIdx = uriSpec.indexOf(':');
628     if (colonIdx != -1) {
629         final int searchFrom = colonIdx - 1;
630         // search backwards starting from character before ':'.
631         int slashIdx = uriSpec.lastIndexOf('/', searchFrom);
632         int queryIdx = uriSpec.lastIndexOf('?', searchFrom);
633         int fragmentIdx = uriSpec.lastIndexOf('#', searchFrom);
634        
635         if (colonIdx == 0 || slashIdx != -1 || 
636             queryIdx != -1 || fragmentIdx != -1) {
637             // A standalone base is a valid URI according to spec
638             if (colonIdx == 0 || (p_base == null && fragmentIdx != 0)) {
639                 throw new MalformedURIException("No scheme found in URI.");
640             }
641         }
642         else {
643             initializeScheme(uriSpec);
644             index = m_scheme.length()+1;
645             
646             // Neither 'scheme:' or 'scheme:#fragment' are valid URIs.
647             if (colonIdx == uriSpecLen - 1 || uriSpec.charAt(colonIdx+1) == '#') {
648                 throw new MalformedURIException("Scheme specific part cannot be empty.");    
649             }
650         }
651     }
652     else if (p_base == null && uriSpec.indexOf('#') != 0) {
653         throw new MalformedURIException("No scheme found in URI.");    
654     }
655 
656     // Two slashes means we may have authority, but definitely means we're either
657     // matching net_path or abs_path. These two productions are ambiguous in that
658     // every net_path (except those containing an IPv6Reference) is an abs_path. 
659     // RFC 2396 resolves this ambiguity by applying a greedy left most matching rule. 
660     // Try matching net_path first, and if that fails we don't have authority so 
661     // then attempt to match abs_path.
662     //
663     // net_path = "//" authority [ abs_path ]
664     // abs_path = "/"  path_segments
665     if (((index+1) < uriSpecLen) &&
666         (uriSpec.charAt(index) == '/' && uriSpec.charAt(index+1) == '/')) {
667       index += 2;
668       int startPos = index;
669 
670       // Authority will be everything up to path, query or fragment
671       char testChar = '\0';
672       while (index < uriSpecLen) {
673         testChar = uriSpec.charAt(index);
674         if (testChar == '/' || testChar == '?' || testChar == '#') {
675           break;
676         }
677         index++;
678       }
679 
680       // Attempt to parse authority. If the section is an empty string
681       // this is a valid server based authority, so set the host to this
682       // value.
683       if (index > startPos) {
684         // If we didn't find authority we need to back up. Attempt to
685         // match against abs_path next.
686         if (!initializeAuthority(uriSpec.substring(startPos, index))) {
687           index = startPos - 2;
688         }
689       }
690       else {
691         m_host = "";
692       }
693     }
694 
695     initializePath(uriSpec, index);
696 
697     // Resolve relative URI to base URI - see RFC 2396 Section 5.2
698     // In some cases, it might make more sense to throw an exception
699     // (when scheme is specified is the string spec and the base URI
700     // is also specified, for example), but we're just following the
701     // RFC specifications
702     if (p_base != null) {
703         absolutize(p_base);
704     }
705   }
706 
707   /**
708    * Absolutize URI with given base URI.
709    *
710    * @param p_base base URI for absolutization
711    */
712   public void absolutize(URI p_base) {
713 
714       // check to see if this is the current doc - RFC 2396 5.2 #2
715       // note that this is slightly different from the RFC spec in that
716       // we don't include the check for query string being null
717       // - this handles cases where the urispec is just a query
718       // string or a fragment (e.g. "?y" or "#s") -
719       // see <http://www.ics.uci.edu/~fielding/url/test1.html> which
720       // identified this as a bug in the RFC
721       if (m_path.length() == 0 && m_scheme == null &&
722           m_host == null && m_regAuthority == null) {
723         m_scheme = p_base.getScheme();
724         m_userinfo = p_base.getUserinfo();
725         m_host = p_base.getHost();
726         m_port = p_base.getPort();
727         m_regAuthority = p_base.getRegBasedAuthority();
728         m_path = p_base.getPath();
729 
730         if (m_queryString == null) {
731           m_queryString = p_base.getQueryString();
732               
733               if (m_fragment == null) {
734                   m_fragment = p_base.getFragment();
735               }
736         }
737         return;
738       }
739 
740       // check for scheme - RFC 2396 5.2 #3
741       // if we found a scheme, it means absolute URI, so we're done
742       if (m_scheme == null) {
743         m_scheme = p_base.getScheme();
744       }
745       else {
746         return;
747       }
748 
749       // check for authority - RFC 2396 5.2 #4
750       // if we found a host, then we've got a network path, so we're done
751       if (m_host == null && m_regAuthority == null) {
752         m_userinfo = p_base.getUserinfo();
753         m_host = p_base.getHost();
754         m_port = p_base.getPort();
755         m_regAuthority = p_base.getRegBasedAuthority();
756       }
757       else {
758         return;
759       }
760 
761       // check for absolute path - RFC 2396 5.2 #5
762       if (m_path.length() > 0 &&
763           m_path.startsWith("/")) {
764         return;
765       }
766 
767       // if we get to this point, we need to resolve relative path
768       // RFC 2396 5.2 #6
769       String   path = "";
770       String   basePath = p_base.getPath();
771 
772       // 6a - get all but the last segment of the base URI path
773       if (basePath != null && basePath.length() > 0) {
774         int lastSlash = basePath.lastIndexOf('/');
775         if (lastSlash != -1) {
776           path = basePath.substring(0, lastSlash+1);
777         }
778       }
779       else if (m_path.length() > 0) {
780           path = "/";
781       }
782 
783       // 6b - append the relative URI path
784       path = path.concat(m_path);
785 
786       // 6c - remove all "./" where "." is a complete path segment
787       int index = -1;
788       while ((index = path.indexOf("/./")) != -1) {
789         path = path.substring(0, index+1).concat(path.substring(index+3));
790       }
791 
792       // 6d - remove "." if path ends with "." as a complete path segment
793       if (path.endsWith("/.")) {
794         path = path.substring(0, path.length()-1);
795       }
796 
797       // 6e - remove all "<segment>/../" where "<segment>" is a complete
798       // path segment not equal to ".."
799       index = 1;
800       int segIndex = -1;
801       String   tempString = null;
802 
803       while ((index = path.indexOf("/../", index)) > 0) {
804         tempString = path.substring(0, path.indexOf("/../"));
805         segIndex = tempString.lastIndexOf('/');
806         if (segIndex != -1) {
807           if (!tempString.substring(segIndex).equals("..")) {
808             path = path.substring(0, segIndex+1).concat(path.substring(index+4));
809             index = segIndex;
810           }
811               else {
812             index += 4;
813         }
814           }
815           else {
816           index += 4;
817       }
818       }
819 
820       // 6f - remove ending "<segment>/.." where "<segment>" is a
821       // complete path segment
822       if (path.endsWith("/..")) {
823         tempString = path.substring(0, path.length()-3);
824         segIndex = tempString.lastIndexOf('/');
825         if (segIndex != -1) {
826           path = path.substring(0, segIndex+1);
827         }
828       }
829       m_path = path;
830     }
831 
832  /**
833   * Initialize the scheme for this URI from a URI string spec.
834   *
835   * @param p_uriSpec the URI specification (cannot be null)
836   *
837   * @exception MalformedURIException if URI does not have a conformant
838   *                                  scheme
839   */
840   private void initializeScheme(String   p_uriSpec)
841                  throws MalformedURIException {
842     int uriSpecLen = p_uriSpec.length();
843     int index = 0;
844     String   scheme = null;
845     char testChar = '\0';
846 
847     while (index < uriSpecLen) {
848       testChar = p_uriSpec.charAt(index);
849       if (testChar == ':' || testChar == '/' ||
850           testChar == '?' || testChar == '#') {
851         break;
852       }
853       index++;
854     }
855     scheme = p_uriSpec.substring(0, index);
856 
857     if (scheme.length() == 0) {
858       throw new MalformedURIException("No scheme found in URI.");
859     }
860     else {
861       setScheme(scheme);
862     }
863   }
864 
865  /**
866   * Initialize the authority (either server or registry based)
867   * for this URI from a URI string spec.
868   *
869   * @param p_uriSpec the URI specification (cannot be null)
870   * 
871   * @return true if the given string matched server or registry
872   * based authority
873   */
874   private boolean initializeAuthority(String   p_uriSpec) {
875     
876     int index = 0;
877     int start = 0;
878     int end = p_uriSpec.length();
879 
880     char testChar = '\0';
881     String   userinfo = null;
882 
883     // userinfo is everything up to @
884     if (p_uriSpec.indexOf('@', start) != -1) {
885       while (index < end) {
886         testChar = p_uriSpec.charAt(index);
887         if (testChar == '@') {
888           break;
889         }
890         index++;
891       }
892       userinfo = p_uriSpec.substring(start, index);
893       index++;
894     }
895 
896     // host is everything up to last ':', or up to 
897     // and including ']' if followed by ':'.
898     String   host = null;
899     start = index;
900     boolean hasPort = false;
901     if (index < end) {
902       if (p_uriSpec.charAt(start) == '[') {
903           int bracketIndex = p_uriSpec.indexOf(']', start);
904           index = (bracketIndex != -1) ? bracketIndex : end;
905           if (index+1 < end && p_uriSpec.charAt(index+1) == ':') {
906             ++index;
907             hasPort = true;
908           }
909           else {
910             index = end;
911           }
912       }
913       else {
914           int colonIndex = p_uriSpec.lastIndexOf(':', end);
915           index = (colonIndex > start) ? colonIndex : end;
916           hasPort = (index != end);
917       }
918     }
919     host = p_uriSpec.substring(start, index);
920     int port = -1;
921     if (host.length() > 0) {
922       // port
923       if (hasPort) {
924         index++;
925         start = index;
926         while (index < end) {
927           index++;
928         }
929         String   portStr = p_uriSpec.substring(start, index);
930         if (portStr.length() > 0) {
931           // REVISIT: Remove this code.
932           /** for (int i = 0; i < portStr.length(); i++) {
933             if (!isDigit(portStr.charAt(i))) {
934               throw new MalformedURIException(
935                    portStr +
936                    " is invalid. Port should only contain digits!");
937             }
938           }**/
939           // REVISIT: Remove this code.
940           // Store port value as string instead of integer.
941           try {
942             port = Integer.parseInt(portStr);
943             if (port == -1) --port;
944           }
945           catch (NumberFormatException   nfe) {
946             port = -2;
947           }
948         }
949       }
950     }
951     
952     if (isValidServerBasedAuthority(host, port, userinfo)) {
953       m_host = host;
954       m_port = port;
955       m_userinfo = userinfo;
956       return true;
957     }
958     // Note: Registry based authority is being removed from a
959     // new spec for URI which would obsolete RFC 2396. If the
960     // spec is added to XML errata, processing of reg_name
961     // needs to be removed. - mrglavas.
962     else if (isValidRegistryBasedAuthority(p_uriSpec)) {
963       m_regAuthority = p_uriSpec;
964       return true;
965     }
966     return false;
967   }
968   
969   /**
970    * Determines whether the components host, port, and user info
971    * are valid as a server authority.
972    * 
973    * @param host the host component of authority
974    * @param port the port number component of authority
975    * @param userinfo the user info component of authority
976    * 
977    * @return true if the given host, port, and userinfo compose
978    * a valid server authority
979    */
980   private boolean isValidServerBasedAuthority(String   host, int port, String   userinfo) {
981     
982     // Check if the host is well formed.
983     if (!isWellFormedAddress(host)) {
984       return false;
985     }
986     
987     // Check that port is well formed if it exists.
988     // REVISIT: There's no restriction on port value ranges, but
989     // perform the same check as in setPort to be consistent. Pass
990     // in a string to this method instead of an integer.
991     if (port < -1 || port > 65535) {
992       return false;
993     }
994     
995     // Check that userinfo is well formed if it exists.
996     if (userinfo != null) {
997       // Userinfo can contain alphanumerics, mark characters, escaped
998       // and ';',':','&','=','+','$',','
999       int index = 0;
1000      int end = userinfo.length();
1001      char testChar = '\0';
1002      while (index < end) {
1003        testChar = userinfo.charAt(index);
1004        if (testChar == '%') {
1005          if (index+2 >= end ||
1006            !isHex(userinfo.charAt(index+1)) ||
1007            !isHex(userinfo.charAt(index+2))) {
1008            return false;
1009          }
1010          index += 2;
1011        }
1012        else if (!isUserinfoCharacter(testChar)) {
1013          return false;
1014        }
1015        ++index;
1016      }
1017    }
1018    return true;
1019  }
1020  
1021  /**
1022   * Determines whether the given string is a registry based authority.
1023   * 
1024   * @param authority the authority component of a URI
1025   * 
1026   * @return true if the given string is a registry based authority
1027   */
1028  private boolean isValidRegistryBasedAuthority(String   authority) {
1029    int index = 0;
1030    int end = authority.length();
1031    char testChar;
1032      
1033    while (index < end) {
1034      testChar = authority.charAt(index);
1035      
1036      // check for valid escape sequence
1037      if (testChar == '%') {
1038        if (index+2 >= end ||
1039            !isHex(authority.charAt(index+1)) ||
1040            !isHex(authority.charAt(index+2))) {
1041            return false;
1042        }
1043        index += 2;
1044      }
1045      // can check against path characters because the set
1046      // is the same except for '/' which we've already excluded.
1047      else if (!isPathCharacter(testChar)) {
1048        return false;
1049      }
1050      ++index;
1051    }
1052    return true;
1053  }
1054      
1055 /**
1056  * Initialize the path for this URI from a URI string spec.
1057  *
1058  * @param p_uriSpec the URI specification (cannot be null)
1059  * @param p_nStartIndex the index to begin scanning from
1060  *
1061  * @exception MalformedURIException if p_uriSpec violates syntax rules
1062  */
1063  private void initializePath(String   p_uriSpec, int p_nStartIndex)
1064                 throws MalformedURIException {
1065    if (p_uriSpec == null) {
1066      throw new MalformedURIException(
1067                "Cannot initialize path from null string!");
1068    }
1069
1070    int index = p_nStartIndex;
1071    int start = p_nStartIndex;
1072    int end = p_uriSpec.length();
1073    char testChar = '\0';
1074
1075    // path - everything up to query string or fragment
1076    if (start < end) {
1077        // RFC 2732 only allows '[' and ']' to appear in the opaque part.
1078        if (getScheme() == null || p_uriSpec.charAt(start) == '/') {
1079        
1080            // Scan path.
1081            // abs_path = "/"  path_segments
1082            // rel_path = rel_segment [ abs_path ]
1083            while (index < end) {
1084                testChar = p_uriSpec.charAt(index);
1085            
1086                // check for valid escape sequence
1087                if (testChar == '%') {
1088                    if (index+2 >= end ||
1089                    !isHex(p_uriSpec.charAt(index+1)) ||
1090                    !isHex(p_uriSpec.charAt(index+2))) {
1091                        throw new MalformedURIException(
1092                            "Path contains invalid escape sequence!");
1093                    }
1094                    index += 2;
1095                }
1096                // Path segments cannot contain '[' or ']' since pchar
1097                // production was not changed by RFC 2732.
1098                else if (!isPathCharacter(testChar)) {
1099                      if (testChar == '?' || testChar == '#') {
1100                          break;
1101                      }
1102                    throw new MalformedURIException(
1103                        "Path contains invalid character: " + testChar);
1104                }
1105                ++index;
1106            }
1107        }
1108        else {
1109            
1110            // Scan opaque part.
1111            // opaque_part = uric_no_slash *uric
1112            while (index < end) {
1113                testChar = p_uriSpec.charAt(index);
1114            
1115                if (testChar == '?' || testChar == '#') {
1116                    break;
1117                  }
1118                
1119                // check for valid escape sequence
1120                if (testChar == '%') {
1121                    if (index+2 >= end ||
1122                    !isHex(p_uriSpec.charAt(index+1)) ||
1123                    !isHex(p_uriSpec.charAt(index+2))) {
1124                        throw new MalformedURIException(
1125                            "Opaque part contains invalid escape sequence!");
1126                    }
1127                    index += 2;
1128                }
1129                // If the scheme specific part is opaque, it can contain '['
1130                // and ']'. uric_no_slash wasn't modified by RFC 2732, which
1131                // I've interpreted as an error in the spec, since the 
1132                // production should be equivalent to (uric - '/'), and uric
1133                // contains '[' and ']'. - mrglavas
1134                else if (!isURICharacter(testChar)) {
1135                    throw new MalformedURIException(
1136                        "Opaque part contains invalid character: " + testChar);
1137                }
1138                ++index;
1139            }
1140        }
1141    }
1142    m_path = p_uriSpec.substring(start, index);
1143
1144    // query - starts with ? and up to fragment or end
1145    if (testChar == '?') {
1146      index++;
1147      start = index;
1148      while (index < end) {
1149        testChar = p_uriSpec.charAt(index);
1150        if (testChar == '#') {
1151          break;
1152        }
1153        if (testChar == '%') {
1154           if (index+2 >= end ||
1155              !isHex(p_uriSpec.charAt(index+1)) ||
1156              !isHex(p_uriSpec.charAt(index+2))) {
1157            throw new MalformedURIException(
1158                    "Query string contains invalid escape sequence!");
1159           }
1160           index += 2;
1161        }
1162        else if (!isURICharacter(testChar)) {
1163          throw new MalformedURIException(
1164                "Query string contains invalid character: " + testChar);
1165        }
1166        index++;
1167      }
1168      m_queryString = p_uriSpec.substring(start, index);
1169    }
1170
1171    // fragment - starts with #
1172    if (testChar == '#') {
1173      index++;
1174      start = index;
1175      while (index < end) {
1176        testChar = p_uriSpec.charAt(index);
1177
1178        if (testChar == '%') {
1179           if (index+2 >= end ||
1180              !isHex(p_uriSpec.charAt(index+1)) ||
1181              !isHex(p_uriSpec.charAt(index+2))) {
1182            throw new MalformedURIException(
1183                    "Fragment contains invalid escape sequence!");
1184           }
1185           index += 2;
1186        }
1187        else if (!isURICharacter(testChar)) {
1188          throw new MalformedURIException(
1189                "Fragment contains invalid character: "+testChar);
1190        }
1191        index++;
1192      }
1193      m_fragment = p_uriSpec.substring(start, index);
1194    }
1195  }
1196
1197 /**
1198  * Get the scheme for this URI.
1199  *
1200  * @return the scheme for this URI
1201  */
1202  public String   getScheme() {
1203    return m_scheme;
1204  }
1205
1206 /**
1207  * Get the scheme-specific part for this URI (everything following the
1208  * scheme and the first colon). See RFC 2396 Section 5.2 for spec.
1209  *
1210  * @return the scheme-specific part for this URI
1211  */
1212  public String   getSchemeSpecificPart() {
1213    StringBuffer   schemespec = new StringBuffer  ();
1214
1215    if (m_host != null || m_regAuthority != null) {
1216      schemespec.append("//");
1217    
1218      // Server based authority.
1219      if (m_host != null) {
1220
1221        if (m_userinfo != null) {
1222          schemespec.append(m_userinfo);
1223          schemespec.append('@');
1224        }
1225        
1226        schemespec.append(m_host);
1227        
1228        if (m_port != -1) {
1229          schemespec.append(':');
1230          schemespec.append(m_port);
1231        }
1232      }
1233      // Registry based authority.
1234      else {
1235          schemespec.append(m_regAuthority);
1236      }
1237    }
1238
1239    if (m_path != null) {
1240      schemespec.append((m_path));
1241    }
1242
1243    if (m_queryString != null) {
1244      schemespec.append('?');
1245      schemespec.append(m_queryString);
1246    }
1247
1248    if (m_fragment != null) {
1249      schemespec.append('#');
1250      schemespec.append(m_fragment);
1251    }
1252
1253    return schemespec.toString();
1254  }
1255
1256 /**
1257  * Get the userinfo for this URI.
1258  *
1259  * @return the userinfo for this URI (null if not specified).
1260  */
1261  public String   getUserinfo() {
1262    return m_userinfo;
1263  }
1264
1265  /**
1266  * Get the host for this URI.
1267  *
1268  * @return the host for this URI (null if not specified).
1269  */
1270  public String   getHost() {
1271    return m_host;
1272  }
1273
1274 /**
1275  * Get the port for this URI.
1276  *
1277  * @return the port for this URI (-1 if not specified).
1278  */
1279  public int getPort() {
1280    return m_port;
1281  }
1282  
1283  /**
1284   * Get the registry based authority for this URI.
1285   * 
1286   * @return the registry based authority (null if not specified).
1287   */
1288  public String   getRegBasedAuthority() {
1289    return m_regAuthority;
1290  }
1291
1292 /**
1293  * Get the path for this URI (optionally with the query string and
1294  * fragment).
1295  *
1296  * @param p_includeQueryString if true (and query string is not null),
1297  *                             then a "?" followed by the query string
1298  *                             will be appended
1299  * @param p_includeFragment if true (and fragment is not null),
1300  *                             then a "#" followed by the fragment
1301  *                             will be appended
1302  *
1303  * @return the path for this URI possibly including the query string
1304  *         and fragment
1305  */
1306  public String   getPath(boolean p_includeQueryString,
1307                        boolean p_includeFragment) {
1308    StringBuffer   pathString = new StringBuffer  (m_path);
1309
1310    if (p_includeQueryString && m_queryString != null) {
1311      pathString.append('?');
1312      pathString.append(m_queryString);
1313    }
1314
1315    if (p_includeFragment && m_fragment != null) {
1316      pathString.append('#');
1317      pathString.append(m_fragment);
1318    }
1319    return pathString.toString();
1320  }
1321
1322 /**
1323  * Get the path for this URI. Note that the value returned is the path
1324  * only and does not include the query string or fragment.
1325  *
1326  * @return the path for this URI.
1327  */
1328  public String   getPath() {
1329    return m_path;
1330  }
1331
1332 /**
1333  * Get the query string for this URI.
1334  *
1335  * @return the query string for this URI. Null is returned if there
1336  *         was no "?" in the URI spec, empty string if there was a
1337  *         "?" but no query string following it.
1338  */
1339  public String   getQueryString() {
1340    return m_queryString;
1341  }
1342
1343 /**
1344  * Get the fragment for this URI.
1345  *
1346  * @return the fragment for this URI. Null is returned if there
1347  *         was no "#" in the URI spec, empty string if there was a
1348  *         "#" but no fragment following it.
1349  */
1350  public String   getFragment() {
1351    return m_fragment;
1352  }
1353
1354 /**
1355  * Set the scheme for this URI. The scheme is converted to lowercase
1356  * before it is set.
1357  *
1358  * @param p_scheme the scheme for this URI (cannot be null)
1359  *
1360  * @exception MalformedURIException if p_scheme is not a conformant
1361  *                                  scheme name
1362  */
1363  public void setScheme(String   p_scheme) throws MalformedURIException {
1364    if (p_scheme == null) {
1365      throw new MalformedURIException(
1366                "Cannot set scheme from null string!");
1367    }
1368    if (!isConformantSchemeName(p_scheme)) {
1369      throw new MalformedURIException("The scheme is not conformant.");
1370    }
1371
1372    m_scheme = p_scheme.toLowerCase();
1373  }
1374
1375 /**
1376  * Set the userinfo for this URI. If a non-null value is passed in and
1377  * the host value is null, then an exception is thrown.
1378  *
1379  * @param p_userinfo the userinfo for this URI
1380  *
1381  * @exception MalformedURIException if p_userinfo contains invalid
1382  *                                  characters
1383  */
1384  public void setUserinfo(String   p_userinfo) throws MalformedURIException {
1385    if (p_userinfo == null) {
1386      m_userinfo = null;
1387      return;
1388    }
1389    else {
1390      if (m_host == null) {
1391        throw new MalformedURIException(
1392                     "Userinfo cannot be set when host is null!");
1393      }
1394
1395      // userinfo can contain alphanumerics, mark characters, escaped
1396      // and ';',':','&','=','+','$',','
1397      int index = 0;
1398      int end = p_userinfo.length();
1399      char testChar = '\0';
1400      while (index < end) {
1401        testChar = p_userinfo.charAt(index);
1402        if (testChar == '%') {
1403          if (index+2 >= end ||
1404              !isHex(p_userinfo.charAt(index+1)) ||
1405              !isHex(p_userinfo.charAt(index+2))) {
1406            throw new MalformedURIException(
1407                  "Userinfo contains invalid escape sequence!");
1408          }
1409        }
1410        else if (!isUserinfoCharacter(testChar)) {
1411          throw new MalformedURIException(
1412                  "Userinfo contains invalid character:"+testChar);
1413        }
1414        index++;
1415      }
1416    }
1417    m_userinfo = p_userinfo;
1418  }
1419
1420 /**
1421  * <p>Set the host for this URI. If null is passed in, the userinfo
1422  * field is also set to null and the port is set to -1.</p>
1423  * 
1424  * <p>Note: This method overwrites registry based authority if it
1425  * previously existed in this URI.</p>
1426  *
1427  * @param p_host the host for this URI
1428  *
1429  * @exception MalformedURIException if p_host is not a valid IP
1430  *                                  address or DNS hostname.
1431  */
1432  public void setHost(String   p_host) throws MalformedURIException {
1433    if (p_host == null || p_host.length() == 0) {
1434      if (p_host != null) {
1435        m_regAuthority = null;
1436      }
1437      m_host = p_host;
1438      m_userinfo = null;
1439      m_port = -1;
1440      return;
1441    }
1442    else if (!isWellFormedAddress(p_host)) {
1443      throw new MalformedURIException("Host is not a well formed address!");
1444    }
1445    m_host = p_host;
1446    m_regAuthority = null;
1447  }
1448
1449 /**
1450  * Set the port for this URI. -1 is used to indicate that the port is
1451  * not specified, otherwise valid port numbers are  between 0 and 65535.
1452  * If a valid port number is passed in and the host field is null,
1453  * an exception is thrown.
1454  *
1455  * @param p_port the port number for this URI
1456  *
1457  * @exception MalformedURIException if p_port is not -1 and not a
1458  *                                  valid port number
1459  */
1460  public void setPort(int p_port) throws MalformedURIException {
1461    if (p_port >= 0 && p_port <= 65535) {
1462      if (m_host == null) {
1463        throw new MalformedURIException(
1464                      "Port cannot be set when host is null!");
1465      }
1466    }
1467    else if (p_port != -1) {
1468      throw new MalformedURIException("Invalid port number!");
1469    }
1470    m_port = p_port;
1471  }
1472  
1473  /**
1474   * <p>Sets the registry based authority for this URI.</p>
1475   * 
1476   * <p>Note: This method overwrites server based authority
1477   * if it previously existed in this URI.</p>
1478   * 
1479   * @param authority the registry based authority for this URI
1480   * 
1481   * @exception MalformedURIException it authority is not a
1482   * well formed registry based authority
1483   */
1484  public void setRegBasedAuthority(String   authority) 
1485    throws MalformedURIException {
1486
1487      if (authority == null) {
1488        m_regAuthority = null;
1489        return;
1490      }
1491    // reg_name = 1*( unreserved | escaped | "$" | "," | 
1492    //            ";" | ":" | "@" | "&" | "=" | "+" )
1493      else if (authority.length() < 1 ||
1494        !isValidRegistryBasedAuthority(authority) ||
1495        authority.indexOf('/') != -1) {
1496      throw new MalformedURIException("Registry based authority is not well formed.");           
1497      }
1498      m_regAuthority = authority;
1499      m_host = null;
1500      m_userinfo = null;
1501      m_port = -1;
1502  }
1503
1504 /**
1505  * Set the path for this URI. If the supplied path is null, then the
1506  * query string and fragment are set to null as well. If the supplied
1507  * path includes a query string and/or fragment, these fields will be
1508  * parsed and set as well. Note that, for URIs following the "generic
1509  * URI" syntax, the path specified should start with a slash.
1510  * For URIs that do not follow the generic URI syntax, this method
1511  * sets the scheme-specific part.
1512  *
1513  * @param p_path the path for this URI (may be null)
1514  *
1515  * @exception MalformedURIException if p_path contains invalid
1516  *                                  characters
1517  */
1518  public void setPath(String   p_path) throws MalformedURIException {
1519    if (p_path == null) {
1520      m_path = null;
1521      m_queryString = null;
1522      m_fragment = null;
1523    }
1524    else {
1525      initializePath(p_path, 0);
1526    }
1527  }
1528
1529 /**
1530  * Append to the end of the path of this URI. If the current path does
1531  * not end in a slash and the path to be appended does not begin with
1532  * a slash, a slash will be appended to the current path before the
1533  * new segment is added. Also, if the current path ends in a slash
1534  * and the new segment begins with a slash, the extra slash will be
1535  * removed before the new segment is appended.
1536  *
1537  * @param p_addToPath the new segment to be added to the current path
1538  *
1539  * @exception MalformedURIException if p_addToPath contains syntax
1540  *                                  errors
1541  */
1542  public void appendPath(String   p_addToPath)
1543                         throws MalformedURIException {
1544    if (p_addToPath == null || p_addToPath.trim().length() == 0) {
1545      return;
1546    }
1547
1548    if (!isURIString(p_addToPath)) {
1549      throw new MalformedURIException(
1550              "Path contains invalid character!");
1551    }
1552
1553    if (m_path == null || m_path.trim().length() == 0) {
1554      if (p_addToPath.startsWith("/")) {
1555        m_path = p_addToPath;
1556      }
1557      else {
1558        m_path = "/" + p_addToPath;
1559      }
1560    }
1561    else if (m_path.endsWith("/")) {
1562      if (p_addToPath.startsWith("/")) {
1563        m_path = m_path.concat(p_addToPath.substring(1));
1564      }
1565      else {
1566        m_path = m_path.concat(p_addToPath);
1567      }
1568    }
1569    else {
1570      if (p_addToPath.startsWith("/")) {
1571        m_path = m_path.concat(p_addToPath);
1572      }
1573      else {
1574        m_path = m_path.concat("/" + p_addToPath);
1575      }
1576    }
1577  }
1578
1579 /**
1580  * Set the query string for this URI. A non-null value is valid only
1581  * if this is an URI conforming to the generic URI syntax and
1582  * the path value is not null.
1583  *
1584  * @param p_queryString the query string for this URI
1585  *
1586  * @exception MalformedURIException if p_queryString is not null and this
1587  *                                  URI does not conform to the generic
1588  *                                  URI syntax or if the path is null
1589  */
1590  public void setQueryString(String   p_queryString) throws MalformedURIException {
1591    if (p_queryString == null) {
1592      m_queryString = null;
1593    }
1594    else if (!isGenericURI()) {
1595      throw new MalformedURIException(
1596              "Query string can only be set for a generic URI!");
1597    }
1598    else if (getPath() == null) {
1599      throw new MalformedURIException(
1600              "Query string cannot be set when path is null!");
1601    }
1602    else if (!isURIString(p_queryString)) {
1603      throw new MalformedURIException(
1604              "Query string contains invalid character!");
1605    }
1606    else {
1607      m_queryString = p_queryString;
1608    }
1609  }
1610
1611 /**
1612  * Set the fragment for this URI. A non-null value is valid only
1613  * if this is a URI conforming to the generic URI syntax and
1614  * the path value is not null.
1615  *
1616  * @param p_fragment the fragment for this URI
1617  *
1618  * @exception MalformedURIException if p_fragment is not null and this
1619  *                                  URI does not conform to the generic
1620  *                                  URI syntax or if the path is null
1621  */
1622  public void setFragment(String   p_fragment) throws MalformedURIException {
1623    if (p_fragment == null) {
1624      m_fragment = null;
1625    }
1626    else if (!isGenericURI()) {
1627      throw new MalformedURIException(
1628         "Fragment can only be set for a generic URI!");
1629    }
1630    else if (getPath() == null) {
1631      throw new MalformedURIException(
1632              "Fragment cannot be set when path is null!");
1633    }
1634    else if (!isURIString(p_fragment)) {
1635      throw new MalformedURIException(
1636              "Fragment contains invalid character!");
1637    }
1638    else {
1639      m_fragment = p_fragment;
1640    }
1641  }
1642
1643 /**
1644  * Determines if the passed-in Object is equivalent to this URI.
1645  *
1646  * @param p_test the Object to test for equality.
1647  *
1648  * @return true if p_test is a URI with all values equal to this
1649  *         URI, false otherwise
1650  */
1651  public boolean equals(Object   p_test) {
1652    if (p_test instanceof URI) {
1653      URI testURI = (URI) p_test;
1654      if (((m_scheme == null && testURI.m_scheme == null) ||
1655           (m_scheme != null && testURI.m_scheme != null &&
1656            m_scheme.equals(testURI.m_scheme))) &&
1657          ((m_userinfo == null && testURI.m_userinfo == null) ||
1658           (m_userinfo != null && testURI.m_userinfo != null &&
1659            m_userinfo.equals(testURI.m_userinfo))) &&
1660          ((m_regAuthority == null && testURI.m_regAuthority == null) ||
1661           (m_regAuthority != null && testURI.m_regAuthority != null &&
1662            m_regAuthority.equals(testURI.m_regAuthority))) &&
1663          ((m_host == null && testURI.m_host == null) ||
1664           (m_host != null && testURI.m_host != null &&
1665            m_host.equals(testURI.m_host))) &&
1666            m_port == testURI.m_port &&
1667          ((m_path == null && testURI.m_path == null) ||
1668           (m_path != null && testURI.m_path != null &&
1669            m_path.equals(testURI.m_path))) &&
1670          ((m_queryString == null && testURI.m_queryString == null) ||
1671           (m_queryString != null && testURI.m_queryString != null &&
1672            m_queryString.equals(testURI.m_queryString))) &&
1673          ((m_fragment == null && testURI.m_fragment == null) ||
1674           (m_fragment != null && testURI.m_fragment != null &&
1675            m_fragment.equals(testURI.m_fragment)))) {
1676        return true;
1677      }
1678    }
1679    return false;
1680  }
1681
1682    /**
1683     * Returns a hash-code value for this URI.  The hash code is based upon all
1684     * of the URI's components, and satisfies the general contract of the
1685     * {@link java.lang.Object#hashCode() Object.hashCode} method. </p>
1686     *
1687     * @return  A hash-code value for this URI
1688     */
1689    public int hashCode() {
1690        return toString().hashCode();
1691    }
1692    
1693 /**
1694  * Get the URI as a string specification. See RFC 2396 Section 5.2.
1695  *
1696  * @return the URI string specification
1697  */
1698  public String   toString() {
1699    StringBuffer   uriSpecString = new StringBuffer  ();
1700
1701    if (m_scheme != null) {
1702      uriSpecString.append(m_scheme);
1703      uriSpecString.append(':');
1704    }
1705    uriSpecString.append(getSchemeSpecificPart());
1706    return uriSpecString.toString();
1707  }
1708
1709 /**
1710  * Get the indicator as to whether this URI uses the "generic URI"
1711  * syntax.
1712  *
1713  * @return true if this URI uses the "generic URI" syntax, false
1714  *         otherwise
1715  */
1716  public boolean isGenericURI() {
1717    // presence of the host (whether valid or empty) means
1718    // double-slashes which means generic uri
1719    return (m_host != null);
1720  }
1721
1722 /**
1723   * Returns whether this URI represents an absolute URI.
1724   *
1725   * @return true if this URI represents an absolute URI, false
1726   *         otherwise
1727   */
1728  public boolean isAbsoluteURI() {
1729      // presence of the scheme means absolute uri
1730      return (m_scheme != null);
1731  }
1732
1733 /**
1734  * Determine whether a scheme conforms to the rules for a scheme name.
1735  * A scheme is conformant if it starts with an alphanumeric, and
1736  * contains only alphanumerics, '+','-' and '.'.
1737  *
1738  * @return true if the scheme is conformant, false otherwise
1739  */
1740  public static boolean isConformantSchemeName(String   p_scheme) {
1741    if (p_scheme == null || p_scheme.trim().length() == 0) {
1742      return false;
1743    }
1744
1745    if (!isAlpha(p_scheme.charAt(0))) {
1746      return false;
1747    }
1748
1749    char testChar;
1750    int schemeLength = p_scheme.length();
1751    for (int i = 1; i < schemeLength; ++i) {
1752      testChar = p_scheme.charAt(i);
1753      if (!isSchemeCharacter(testChar)) {
1754        return false;
1755      }
1756    }
1757
1758    return true;
1759  }
1760
1761 /**
1762  * Determine whether a string is syntactically capable of representing
1763  * a valid IPv4 address, IPv6 reference or the domain name of a network host. 
1764  * A valid IPv4 address consists of four decimal digit groups separated by a
1765  * '.'. Each group must consist of one to three digits. See RFC 2732 Section 3,
1766  * and RFC 2373 Section 2.2, for the definition of IPv6 references. A hostname 
1767  * consists of domain labels (each of which must begin and end with an alphanumeric 
1768  * but may contain '-') separated & by a '.'. See RFC 2396 Section 3.2.2.
1769  *
1770  * @return true if the string is a syntactically valid IPv4 address, 
1771  * IPv6 reference or hostname
1772  */
1773  public static boolean isWellFormedAddress(String   address) {
1774    if (address == null) {
1775      return false;
1776    }
1777
1778    int addrLength = address.length();
1779    if (addrLength == 0) {
1780      return false;
1781    }
1782    
1783    // Check if the host is a valid IPv6reference.
1784    if (address.startsWith("[")) {
1785      return isWellFormedIPv6Reference(address);
1786    }
1787
1788    // Cannot start with a '.', '-', or end with a '-'.
1789    if (address.startsWith(".") || 
1790        address.startsWith("-") || 
1791        address.endsWith("-")) {
1792      return false;
1793    }
1794
1795    // rightmost domain label starting with digit indicates IP address
1796    // since top level domain label can only start with an alpha
1797    // see RFC 2396 Section 3.2.2
1798    int index = address.lastIndexOf('.');
1799    if (address.endsWith(".")) {
1800      index = address.substring(0, index).lastIndexOf('.');
1801    }
1802
1803    if (index+1 < addrLength && isDigit(address.charAt(index+1))) {
1804      return isWellFormedIPv4Address(address);
1805    }
1806    else {
1807      // hostname      = *( domainlabel "." ) toplabel [ "." ]
1808      // domainlabel   = alphanum | alphanum *( alphanum | "-" ) alphanum
1809      // toplabel      = alpha | alpha *( alphanum | "-" ) alphanum
1810      
1811      // RFC 2396 states that hostnames take the form described in 
1812      // RFC 1034 (Section 3) and RFC 1123 (Section 2.1). According
1813      // to RFC 1034, hostnames are limited to 255 characters.
1814      if (addrLength > 255) {
1815          return false;
1816      }
1817      
1818      // domain labels can contain alphanumerics and '-"
1819      // but must start and end with an alphanumeric
1820      char testChar;
1821      int labelCharCount = 0;
1822
1823      for (int i = 0; i < addrLength; i++) {
1824        testChar = address.charAt(i);
1825        if (testChar == '.') {
1826          if (!isAlphanum(address.charAt(i-1))) {
1827            return false;
1828          }
1829          if (i+1 < addrLength && !isAlphanum(address.charAt(i+1))) {
1830            return false;
1831          }
1832          labelCharCount = 0;
1833        }
1834        else if (!isAlphanum(testChar) && testChar != '-') {
1835          return false;
1836        }
1837        // RFC 1034: Labels must be 63 characters or less.
1838        else if (++labelCharCount > 63) {
1839          return false;
1840        }
1841      }
1842    }
1843    return true;
1844  }
1845  
1846  /**
1847   * <p>Determines whether a string is an IPv4 address as defined by 
1848   * RFC 2373, and under the further constraint that it must be a 32-bit
1849   * address. Though not expressed in the grammar, in order to satisfy 
1850   * the 32-bit address constraint, each segment of the address cannot 
1851   * be greater than 255 (8 bits of information).</p>
1852   *
1853   * <p><code>IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT</code></p>
1854   *
1855   * @return true if the string is a syntactically valid IPv4 address
1856   */
1857  public static boolean isWellFormedIPv4Address(String   address) {
1858      
1859      int addrLength = address.length();
1860      char testChar;
1861      int numDots = 0;
1862      int numDigits = 0;
1863
1864      // make sure that 1) we see only digits and dot separators, 2) that
1865      // any dot separator is preceded and followed by a digit and
1866      // 3) that we find 3 dots
1867      //
1868      // RFC 2732 amended RFC 2396 by replacing the definition 
1869      // of IPv4address with the one defined by RFC 2373. - mrglavas
1870      //
1871      // IPv4address = 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT "." 1*3DIGIT
1872      //
1873      // One to three digits must be in each segment.
1874      for (int i = 0; i < addrLength; i++) {
1875        testChar = address.charAt(i);
1876        if (testChar == '.') {
1877          if ((i > 0 && !isDigit(address.charAt(i-1))) || 
1878              (i+1 < addrLength && !isDigit(address.charAt(i+1)))) {
1879            return false;
1880          }
1881          numDigits = 0;
1882          if (++numDots > 3) {
1883            return false;
1884          }
1885        }
1886        else if (!isDigit(testChar)) {
1887          return false;
1888        }
1889        // Check that that there are no more than three digits
1890        // in this segment.
1891        else if (++numDigits > 3) {
1892          return false;
1893        }
1894        // Check that this segment is not greater than 255.
1895        else if (numDigits == 3) {
1896          char first = address.charAt(i-2);
1897          char second = address.charAt(i-1);
1898          if (!(first < '2' || 
1899               (first == '2' && 
1900               (second < '5' || 
1901               (second == '5' && testChar <= '5'))))) {
1902            return false;
1903          }
1904        }
1905      }
1906      return (numDots == 3);
1907  }
1908  
1909  /**
1910   * <p>Determines whether a string is an IPv6 reference as defined
1911   * by RFC 2732, where IPv6address is defined in RFC 2373. The 
1912   * IPv6 address is parsed according to Section 2.2 of RFC 2373,
1913   * with the additional constraint that the address be composed of
1914   * 128 bits of information.</p>
1915   *
1916   * <p><code>IPv6reference = "[" IPv6address "]"</code></p>
1917   *
1918   * <p>Note: The BNF expressed in RFC 2373 Appendix B does not 
1919   * accurately describe section 2.2, and was in fact removed from
1920   * RFC 3513, the successor of RFC 2373.</p>
1921   *
1922   * @return true if the string is a syntactically valid IPv6 reference
1923   */
1924  public static boolean isWellFormedIPv6Reference(String   address) {
1925
1926      int addrLength = address.length();
1927      int index = 1;
1928      int end = addrLength-1;
1929      
1930      // Check if string is a potential match for IPv6reference.
1931      if (!(addrLength > 2 && address.charAt(0) == '[' 
1932          && address.charAt(end) == ']')) {
1933          return false;
1934      }
1935      
1936      // Counter for the number of 16-bit sections read in the address.
1937      int [] counter = new int[1];
1938      
1939      // Scan hex sequence before possible '::' or IPv4 address.
1940      index = scanHexSequence(address, index, end, counter);
1941      if (index == -1) {
1942          return false;
1943      }
1944      // Address must contain 128-bits of information.
1945      else if (index == end) {
1946          return (counter[0] == 8);
1947      }
1948      
1949      if (index+1 < end && address.charAt(index) == ':') {
1950          if (address.charAt(index+1) == ':') {
1951              // '::' represents at least one 16-bit group of zeros.
1952              if (++counter[0] > 8) {
1953                  return false;
1954              }
1955              index += 2;
1956              // Trailing zeros will fill out the rest of the address.
1957              if (index == end) {
1958                 return true;
1959              }
1960          }
1961          // If the second character wasn't ':', in order to be valid,
1962          // the remainder of the string must match IPv4Address, 
1963          // and we must have read exactly 6 16-bit groups.
1964          else {
1965              return (counter[0] == 6) && 
1966                  isWellFormedIPv4Address(address.substring(index+1, end));
1967          }
1968      }
1969      else {
1970          return false;
1971      }
1972      
1973      // 3. Scan hex sequence after '::'.
1974      int prevCount = counter[0];
1975      index = scanHexSequence(address, index, end, counter);
1976
1977      // We've either reached the end of the string, the address ends in
1978      // an IPv4 address, or it is invalid. scanHexSequence has already 
1979      // made sure that we have the right number of bits. 
1980      return (index == end) || 
1981          (index != -1 && isWellFormedIPv4Address(
1982          address.substring((counter[0] > prevCount) ? index+1 : index, end)));
1983  }
1984  
1985  /**
1986   * Helper method for isWellFormedIPv6Reference which scans the 
1987   * hex sequences of an IPv6 address. It returns the index of the 
1988   * next character to scan in the address, or -1 if the string 
1989   * cannot match a valid IPv6 address. 
1990   *
1991   * @param address the string to be scanned
1992   * @param index the beginning index (inclusive)
1993   * @param end the ending index (exclusive)
1994   * @param counter a counter for the number of 16-bit sections read
1995   * in the address
1996   *
1997   * @return the index of the next character to scan, or -1 if the
1998   * string cannot match a valid IPv6 address
1999   */
2000  private static int scanHexSequence (String   address, int index, int end, int [] counter) {
2001      
2002      char testChar;
2003      int numDigits = 0;
2004      int start = index;
2005      
2006      // Trying to match the following productions:
2007      // hexseq = hex4 *( ":" hex4)
2008      // hex4   = 1*4HEXDIG
2009      for (; index < end; ++index) {
2010          testChar = address.charAt(index);
2011          if (testChar == ':') {
2012              // IPv6 addresses are 128-bit, so there can be at most eight sections.
2013              if (numDigits > 0 && ++counter[0] > 8) {
2014                  return -1;
2015              }
2016              // This could be '::'.
2017              if (numDigits == 0 || ((index+1 < end) && address.charAt(index+1) == ':')) {
2018                  return index;
2019              }
2020              numDigits = 0;
2021        }
2022        // This might be invalid or an IPv4address. If it's potentially an IPv4address,
2023        // backup to just after the last valid character that matches hexseq.
2024        else if (!isHex(testChar)) {
2025            if (testChar == '.' && numDigits < 4 && numDigits > 0 && counter[0] <= 6) {
2026                int back = index - numDigits - 1;
2027                return (back >= start) ? back : (back+1);
2028            }
2029            return -1;
2030        }
2031        // There can be at most 4 hex digits per group.
2032        else if (++numDigits > 4) {
2033            return -1;
2034        }
2035      }
2036      return (numDigits > 0 && ++counter[0] <= 8) ? end : -1;
2037  } 
2038
2039
2040 /**
2041  * Determine whether a char is a digit.
2042  *
2043  * @return true if the char is betweeen '0' and '9', false otherwise
2044  */
2045  private static boolean isDigit(char p_char) {
2046    return p_char >= '0' && p_char <= '9';
2047  }
2048
2049 /**
2050  * Determine whether a character is a hexadecimal character.
2051  *
2052  * @return true if the char is betweeen '0' and '9', 'a' and 'f'
2053  *         or 'A' and 'F', false otherwise
2054  */
2055  private static boolean isHex(char p_char) {
2056    return (p_char <= 'f' && (fgLookupTable[p_char] & ASCII_HEX_CHARACTERS) != 0);
2057  }
2058
2059 /**
2060  * Determine whether a char is an alphabetic character: a-z or A-Z
2061  *
2062  * @return true if the char is alphabetic, false otherwise
2063  */
2064  private static boolean isAlpha(char p_char) {
2065      return ((p_char >= 'a' && p_char <= 'z') || (p_char >= 'A' && p_char <= 'Z' ));
2066  }
2067
2068 /**
2069  * Determine whether a char is an alphanumeric: 0-9, a-z or A-Z
2070  *
2071  * @return true if the char is alphanumeric, false otherwise
2072  */
2073  private static boolean isAlphanum(char p_char) {
2074     return (p_char <= 'z' && (fgLookupTable[p_char] & MASK_ALPHA_NUMERIC) != 0);
2075  }
2076
2077 /**
2078  * Determine whether a character is a reserved character:
2079  * ';', '/', '?', ':', '@', '&', '=', '+', '$', ',', '[', or ']'
2080  *
2081  * @return true if the string contains any reserved characters
2082  */
2083  private static boolean isReservedCharacter(char p_char) {
2084     return (p_char <= ']' && (fgLookupTable[p_char] & RESERVED_CHARACTERS) != 0);
2085  }
2086
2087 /**
2088  * Determine whether a char is an unreserved character.
2089  *
2090  * @return true if the char is unreserved, false otherwise
2091  */
2092  private static boolean isUnreservedCharacter(char p_char) {
2093     return (p_char <= '~' && (fgLookupTable[p_char] & MASK_UNRESERVED_MASK) != 0);
2094  }
2095
2096 /**
2097  * Determine whether a char is a URI character (reserved or 
2098  * unreserved, not including '%' for escaped octets).
2099  *
2100  * @return true if the char is a URI character, false otherwise
2101  */
2102  private static boolean isURICharacter (char p_char) {
2103      return (p_char <= '~' && (fgLookupTable[p_char] & MASK_URI_CHARACTER) != 0);
2104  }
2105
2106 /**
2107  * Determine whether a char is a scheme character.
2108  *
2109  * @return true if the char is a scheme character, false otherwise
2110  */
2111  private static boolean isSchemeCharacter (char p_char) {
2112      return (p_char <= 'z' && (fgLookupTable[p_char] & MASK_SCHEME_CHARACTER) != 0);
2113  }
2114
2115 /**
2116  * Determine whether a char is a userinfo character.
2117  *
2118  * @return true if the char is a userinfo character, false otherwise
2119  */
2120  private static boolean isUserinfoCharacter (char p_char) {
2121      return (p_char <= 'z' && (fgLookupTable[p_char] & MASK_USERINFO_CHARACTER) != 0);
2122  }
2123  
2124 /**
2125  * Determine whether a char is a path character.
2126  * 
2127  * @return true if the char is a path character, false otherwise
2128  */
2129  private static boolean isPathCharacter (char p_char) {
2130      return (p_char <= '~' && (fgLookupTable[p_char] & MASK_PATH_CHARACTER) != 0);
2131  }
2132
2133
2134 /**
2135  * Determine whether a given string contains only URI characters (also
2136  * called "uric" in RFC 2396). uric consist of all reserved
2137  * characters, unreserved characters and escaped characters.
2138  *
2139  * @return true if the string is comprised of uric, false otherwise
2140  */
2141  private static boolean isURIString(String   p_uric) {
2142    if (p_uric == null) {
2143      return false;
2144    }
2145    int end = p_uric.length();
2146    char testChar = '\0';
2147    for (int i = 0; i < end; i++) {
2148      testChar = p_uric.charAt(i);
2149      if (testChar == '%') {
2150        if (i+2 >= end ||
2151            !isHex(p_uric.charAt(i+1)) ||
2152            !isHex(p_uric.charAt(i+2))) {
2153          return false;
2154        }
2155        else {
2156          i += 2;
2157          continue;
2158        }
2159      }
2160      if (isURICharacter(testChar)) {
2161          continue;
2162      }
2163      else {
2164        return false;
2165      }
2166    }
2167    return true;
2168  }
2169}
2170
2171
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