PrecisionDecimalDV


1   /*
2    * Copyright 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  package org.apache.xerces.impl.dv.xs;
17  
18  import org.apache.xerces.impl.dv.InvalidDatatypeValueException;
19  import org.apache.xerces.impl.dv.ValidationContext;
20  
21  /**
22   * Validator for <precisionDecimal> datatype (W3C Schema 1.1)
23   * 
24   * @xerces.experimental
25   * 
26   * @author Ankit Pasricha, IBM
27   * 
28   * @version $Id: PrecisionDecimalDV.java,v 1.2 2004/10/06 14:56:46 mrglavas Exp $
29   */
30  class PrecisionDecimalDV extends TypeValidator {
31      
32      static class XPrecisionDecimal {
33          
34          // sign: 0 for absent; 1 for positive values; -1 for negative values (except in case of INF, -INF)
35          int sign = 1;
36          // total digits. >= 1
37          int totalDigits = 0;
38          // integer digits when sign != 0
39          int intDigits = 0;
40          // fraction digits when sign != 0
41          int fracDigits = 0;
42          //precision
43          //int precision = 0;
44          // the string representing the integer part
45          String   ivalue = "";
46          // the string representing the fraction part
47          String   fvalue = "";
48          
49          int pvalue = 0;
50          
51          
52          XPrecisionDecimal(String   content) throws NumberFormatException   {
53              if(content.equals("NaN")) {
54                  ivalue = content;
55                  sign = 0;
56              }
57              if(content.equals("+INF") || content.equals("INF") || content.equals("-INF")) {
58                  ivalue = content.charAt(0) == '+' ? content.substring(1) : content;
59                  return;
60              }
61              initD(content);
62          }
63          
64          void initD(String   content) throws NumberFormatException   {
65              int len = content.length();
66              if (len == 0)
67                  throw new NumberFormatException  ();
68              
69              // these 4 variables are used to indicate where the integre/fraction
70              // parts start/end.
71              int intStart = 0, intEnd = 0, fracStart = 0, fracEnd = 0;
72              
73              // Deal with leading sign symbol if present
74              if (content.charAt(0) == '+') {
75                  // skip '+', so intStart should be 1
76                  intStart = 1;
77              }
78              else if (content.charAt(0) == '-') {
79                  intStart = 1;
80                  sign = -1;
81              }
82              
83              // skip leading zeroes in integer part
84              int actualIntStart = intStart;
85              while (actualIntStart < len && content.charAt(actualIntStart) == '0') {
86                  actualIntStart++;
87              }
88              
89              // Find the ending position of the integer part
90              for (intEnd = actualIntStart; intEnd < len && TypeValidator.isDigit(content.charAt(intEnd)); intEnd++);
91              
92              // Not reached the end yet
93              if (intEnd < len) {
94                  // the remaining part is not ".DDD" or "EDDD" or "eDDD", error
95                  if (content.charAt(intEnd) != '.' && content.charAt(intEnd) != 'E' && content.charAt(intEnd) != 'e')
96                      throw new NumberFormatException  ();
97                  
98                  if(content.charAt(intEnd) == '.') {
99                      // fraction part starts after '.', and ends at the end of the input
100                     fracStart = intEnd + 1;
101                     
102                     // find location of E or e (if present)
103                     // Find the ending position of the fracion part
104                     for (fracEnd = fracStart;
105                     fracEnd < len && TypeValidator.isDigit(content.charAt(fracEnd));
106                     fracEnd++);
107                 }
108                 else {
109                     pvalue = Integer.parseInt(content.substring(intEnd + 1, len));
110                 }
111             }
112             
113             // no integer part, no fraction part, error.
114             if (intStart == intEnd && fracStart == fracEnd)
115                 throw new NumberFormatException  ();
116             
117             // ignore trailing zeroes in fraction part
118             /*while (fracEnd > fracStart && content.charAt(fracEnd-1) == '0') {
119              fracEnd--;
120              }*/
121             
122             // check whether there is non-digit characters in the fraction part
123             for (int fracPos = fracStart; fracPos < fracEnd; fracPos++) {
124                 if (!TypeValidator.isDigit(content.charAt(fracPos)))
125                     throw new NumberFormatException  ();
126             }
127             
128             intDigits = intEnd - actualIntStart;
129             fracDigits = fracEnd - fracStart;
130             
131             if (intDigits > 0) {
132                 ivalue = content.substring(actualIntStart, intEnd);
133             }
134             
135             if (fracDigits > 0) {
136                 fvalue = content.substring(fracStart, fracEnd);
137                 if(fracEnd < len) {
138                     pvalue = Integer.parseInt(content.substring(fracEnd + 1, len));
139                 }
140             }
141             totalDigits = intDigits + fracDigits;
142         }
143         
144         
145         public boolean equals(Object   val) {
146             if (val == this)
147                 return true;
148             
149             if (!(val instanceof XPrecisionDecimal))
150                 return false;
151             XPrecisionDecimal oval = (XPrecisionDecimal)val;
152             
153             return this.compareTo(oval) == EQUAL;
154         }
155         
156         /**
157          * @return
158          */
159         private int compareFractionalPart(XPrecisionDecimal oval) {
160             if(fvalue.equals(oval.fvalue))
161                 return EQUAL;
162             
163             StringBuffer   temp1 = new StringBuffer  (fvalue);
164             StringBuffer   temp2 = new StringBuffer  (oval.fvalue);
165             
166             truncateTrailingZeros(temp1, temp2);
167             return temp1.toString().compareTo(temp2.toString());
168         }
169         
170         private void truncateTrailingZeros(StringBuffer   fValue, StringBuffer   otherFValue) {
171             for(int i = fValue.length() - 1;i >= 0; i--)
172                 if(fValue.charAt(i) == '0')
173                     fValue.deleteCharAt(i);
174                 else
175                     break;
176             
177             for(int i = otherFValue.length() - 1;i >= 0; i--)
178                 if(otherFValue.charAt(i) == '0')
179                     otherFValue.deleteCharAt(i);
180                 else
181                     break;
182         }
183         
184         public int compareTo(XPrecisionDecimal val) {
185             
186             // seen NaN
187             if(sign == 0)
188                 return INDETERMINATE;
189             
190             //INF is greater than everything and equal to itself
191             if(ivalue.equals("INF") || val.ivalue.equals("INF")) {
192                 if(ivalue.equals(val.ivalue))
193                     return EQUAL;
194                 else if(ivalue.equals("INF"))
195                     return GREATER_THAN;
196                 return LESS_THAN;
197             }
198             
199             //-INF is smaller than everything and equal itself
200             if(ivalue.equals("-INF") || val.ivalue.equals("-INF")) {
201                 if(ivalue.equals(val.ivalue))
202                     return EQUAL;
203                 else if(ivalue.equals("-INF"))
204                     return LESS_THAN;
205                 return GREATER_THAN;
206             }
207             
208             if (sign != val.sign)
209                 return sign > val.sign ? GREATER_THAN : LESS_THAN;
210             
211             return sign * compare(val);
212         }
213         
214         // To enable comparison - the exponent part of the decimal will be limited
215         // to the max value of int.
216         private int compare(XPrecisionDecimal val) {        
217             
218             if(pvalue != 0 || val.pvalue != 0) {
219                 if(pvalue == val.pvalue)
220                     return intComp(val);
221                 else {
222                     
223                     if(intDigits + pvalue != val.intDigits + val.pvalue)
224                         return intDigits + pvalue > val.intDigits + val.pvalue ? GREATER_THAN : LESS_THAN;
225                     
226                     //otherwise the 2 combined values are the same
227                     if(pvalue > val.pvalue) {
228                         int expDiff = pvalue - val.pvalue;
229                         StringBuffer   buffer = new StringBuffer  (ivalue);
230                         StringBuffer   fbuffer = new StringBuffer  (fvalue);
231                         for(int i = 0;i < expDiff; i++) {
232                             if(i < fracDigits) {
233                                 buffer.append(fvalue.charAt(i));
234                                 fbuffer.deleteCharAt(i);
235                             }
236                             else
237                                 buffer.append('0');
238                         }                       
239                         return compareDecimal(buffer.toString(), val.ivalue, fbuffer.toString(), val.fvalue);
240                     }
241                     else {
242                         int expDiff = val.pvalue - pvalue;
243                         StringBuffer   buffer = new StringBuffer  (val.ivalue);
244                         StringBuffer   fbuffer = new StringBuffer  (val.fvalue);
245                         for(int i = 0;i < expDiff; i++) {
246                             if(i < val.fracDigits) {
247                                 buffer.append(val.fvalue.charAt(i));
248                                 fbuffer.deleteCharAt(i);
249                             }
250                             else
251                                 buffer.append('0');
252                         }                       
253                         return compareDecimal(ivalue, buffer.toString(), fvalue, fbuffer.toString());
254                     }
255                 }
256             }
257             else {
258                 return intComp(val);
259             }
260         }
261         
262         /**
263          * @param val
264          * @return
265          */
266         private int intComp(XPrecisionDecimal val) {
267             if (intDigits != val.intDigits)
268                 return intDigits > val.intDigits ? GREATER_THAN : LESS_THAN;
269             
270             return compareDecimal(ivalue, val.ivalue, fvalue, val.fvalue);
271         }
272         
273         /**
274          * @param val
275          * @return
276          */
277         private int compareDecimal(String   iValue, String   fValue, String   otherIValue, String   otherFValue) {
278             int ret = iValue.compareTo(otherIValue);
279             if (ret != 0)
280                 return ret > 0 ? GREATER_THAN : LESS_THAN;
281             
282             if(fValue.equals(otherFValue))
283                 return EQUAL;
284             
285             StringBuffer   temp1=new StringBuffer  (fValue);
286             StringBuffer   temp2=new StringBuffer  (otherFValue);
287             
288             truncateTrailingZeros(temp1, temp2);
289             ret = temp1.toString().compareTo(temp2.toString());
290             return ret == 0 ? EQUAL : (ret > 0 ? GREATER_THAN : LESS_THAN);
291         }
292         
293         private String   canonical;
294         
295         public synchronized String   toString() {
296             if (canonical == null) {
297                 makeCanonical();
298             }
299             return canonical;
300         }
301         
302         private void makeCanonical() {
303             // REVISIT: to be determined by working group
304             canonical = "TBD by Working Group";
305         }
306         
307         /**
308          * @param decimal
309          * @return
310          */
311         public boolean isIdentical(XPrecisionDecimal decimal) {
312             if(ivalue.equals(decimal.ivalue) && (ivalue.equals("INF") || ivalue.equals("-INF") || ivalue.equals("NaN")))
313                 return true;
314             
315             if(sign == decimal.sign && intDigits == decimal.intDigits && fracDigits == decimal.fracDigits && pvalue == decimal.pvalue 
316                     && ivalue.equals(decimal.ivalue) && fvalue.equals(decimal.fvalue))
317                 return true;
318             return false;
319         }
320         
321     }
322     /* (non-Javadoc)
323      * @see org.apache.xerces.impl.dv.xs.TypeValidator#getAllowedFacets()
324      */
325     public short getAllowedFacets() {
326         return ( XSSimpleTypeDecl.FACET_PATTERN | XSSimpleTypeDecl.FACET_WHITESPACE | XSSimpleTypeDecl.FACET_ENUMERATION |XSSimpleTypeDecl.FACET_MAXINCLUSIVE |XSSimpleTypeDecl.FACET_MININCLUSIVE | XSSimpleTypeDecl.FACET_MAXEXCLUSIVE  | XSSimpleTypeDecl.FACET_MINEXCLUSIVE | XSSimpleTypeDecl.FACET_TOTALDIGITS | XSSimpleTypeDecl.FACET_FRACTIONDIGITS);
327     }
328     
329     /* (non-Javadoc)
330      * @see org.apache.xerces.impl.dv.xs.TypeValidator#getActualValue(java.lang.String, org.apache.xerces.impl.dv.ValidationContext)
331      */
332     public Object   getActualValue(String   content, ValidationContext context)
333     throws InvalidDatatypeValueException {
334         try {
335             return new XPrecisionDecimal(content);
336         } catch (NumberFormatException   nfe) {
337             throw new InvalidDatatypeValueException("cvc-datatype-valid.1.2.1", new Object  []{content, "precisionDecimal"});
338         }
339     }
340     
341     public int compare(Object   value1, Object   value2) {
342         return ((XPrecisionDecimal)value1).compareTo((XPrecisionDecimal)value2);
343     }
344     
345     public int getFractionDigits(Object   value) {
346         return ((XPrecisionDecimal)value).fracDigits;
347     }
348     
349     public int getTotalDigits(Object   value) {
350         return ((XPrecisionDecimal)value).totalDigits;
351     }
352     
353     public boolean isIdentical(Object   value1, Object   value2) {
354         if(!(value2 instanceof XPrecisionDecimal) || !(value1 instanceof XPrecisionDecimal))
355             return false;
356         return ((XPrecisionDecimal)value1).isIdentical((XPrecisionDecimal)value2);  
357     }
358 }
359
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