ElemExtensionDecl


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   * $Id: ElemExtensionDecl.java,v 1.21 2004/02/16 20:32:33 minchau Exp $
18   */
19  package org.apache.xalan.templates;
20  
21  import javax.xml.transform.TransformerException  ;
22  
23  import org.apache.xalan.extensions.ExtensionNamespaceSupport;
24  import org.apache.xalan.extensions.ExtensionNamespacesManager;
25  import org.apache.xalan.res.XSLMessages;
26  import org.apache.xalan.res.XSLTErrorResources;
27  import org.apache.xalan.transformer.TransformerImpl;
28  import org.apache.xml.utils.StringVector;
29  
30  /**
31   * Implement the declaration of an extension element 
32   * @xsl.usage internal
33   */
34  public class ElemExtensionDecl extends ElemTemplateElement
35  {
36  
37    /**
38     * Constructor ElemExtensionDecl
39     *
40     */
41    public ElemExtensionDecl()
42    {
43  
44      // System.out.println("ElemExtensionDecl ctor");
45    }
46  
47    /** Prefix string for this extension element.
48     *  @serial         */
49    private String   m_prefix = null;
50  
51    /**
52     * Set the prefix for this extension element  
53     *
54     *
55     * @param v Prefix to set for this extension element
56     */
57    public void setPrefix(String   v)
58    {
59      m_prefix = v;
60    }
61  
62    /**
63     * Get the prefix for this extension element
64     *
65     *
66     * @return Prefix for this extension element
67     */
68    public String   getPrefix()
69    {
70      return m_prefix;
71    }
72  
73    /** StringVector holding the names of functions defined in this extension.
74     *  @serial     */
75    private StringVector m_functions = new StringVector();
76  
77    /**
78     * Set the names of functions defined in this extension  
79     *
80     *
81     * @param v StringVector holding the names of functions defined in this extension
82     */
83    public void setFunctions(StringVector v)
84    {
85      m_functions = v;
86    }
87  
88    /**
89     * Get the names of functions defined in this extension
90     *
91     *
92     * @return StringVector holding the names of functions defined in this extension
93     */
94    public StringVector getFunctions()
95    {
96      return m_functions;
97    }
98  
99    /**
100    * Get a function at a given index in this extension element 
101    *
102    *
103    * @param i Index of function to get
104    *
105    * @return Name of Function at given index
106    *
107    * @throws ArrayIndexOutOfBoundsException
108    */
109   public String   getFunction(int i) throws ArrayIndexOutOfBoundsException  
110   {
111 
112     if (null == m_functions)
113       throw new ArrayIndexOutOfBoundsException  ();
114 
115     return (String  ) m_functions.elementAt(i);
116   }
117 
118   /**
119    * Get count of functions defined in this extension element
120    *
121    *
122    * @return count of functions defined in this extension element
123    */
124   public int getFunctionCount()
125   {
126     return (null != m_functions) ? m_functions.size() : 0;
127   }
128 
129   /** StringVector of elements defined in this extension.
130    *  @serial         */
131   private StringVector m_elements = null;
132 
133   /**
134    * Set StringVector of elements for this extension
135    *
136    *
137    * @param v StringVector of elements to set
138    */
139   public void setElements(StringVector v)
140   {
141     m_elements = v;
142   }
143 
144   /**
145    * Get StringVector of elements defined for this extension  
146    *
147    *
148    * @return StringVector of elements defined for this extension
149    */
150   public StringVector getElements()
151   {
152     return m_elements;
153   }
154 
155   /**
156    * Get the element at the given index
157    *
158    *
159    * @param i Index of element to get
160    *
161    * @return The element at the given index
162    *
163    * @throws ArrayIndexOutOfBoundsException
164    */
165   public String   getElement(int i) throws ArrayIndexOutOfBoundsException  
166   {
167 
168     if (null == m_elements)
169       throw new ArrayIndexOutOfBoundsException  ();
170 
171     return (String  ) m_elements.elementAt(i);
172   }
173 
174   /**
175    * Return the count of elements defined for this extension element 
176    *
177    *
178    * @return the count of elements defined for this extension element
179    */
180   public int getElementCount()
181   {
182     return (null != m_elements) ? m_elements.size() : 0;
183   }
184 
185   /**
186    * Get an int constant identifying the type of element.
187    * @see org.apache.xalan.templates.Constants
188    *
189    * @return The token ID for this element
190    */
191   public int getXSLToken()
192   {
193     return Constants.ELEMNAME_EXTENSIONDECL;
194   }
195   
196   public void compose(StylesheetRoot sroot) throws TransformerException  
197   {
198     super.compose(sroot);
199     String   prefix = getPrefix();
200     String   declNamespace = getNamespaceForPrefix(prefix);
201     String   lang = null;
202     String   srcURL = null;
203     String   scriptSrc = null;
204     if (null == declNamespace)
205       throw new TransformerException  (XSLMessages.createMessage(XSLTErrorResources.ER_NO_NAMESPACE_DECL, new Object  []{prefix})); 
206       //"Prefix " + prefix does not have a corresponding namespace declaration");
207     for (ElemTemplateElement child = getFirstChildElem(); child != null;
208           child = child.getNextSiblingElem())
209     {
210       if (Constants.ELEMNAME_EXTENSIONSCRIPT == child.getXSLToken())
211       {
212         ElemExtensionScript sdecl = (ElemExtensionScript) child;
213         lang = sdecl.getLang();
214         srcURL = sdecl.getSrc();
215         ElemTemplateElement childOfSDecl = sdecl.getFirstChildElem();
216         if (null != childOfSDecl)
217         {
218           if (Constants.ELEMNAME_TEXTLITERALRESULT
219                   == childOfSDecl.getXSLToken())
220           {
221             ElemTextLiteral tl = (ElemTextLiteral) childOfSDecl;
222             char[] chars = tl.getChars();
223             scriptSrc = new String  (chars);
224             if (scriptSrc.trim().length() == 0)
225               scriptSrc = null;
226           }
227         }
228       }
229     }
230     if (null == lang)
231       lang = "javaclass";
232     if (lang.equals("javaclass") && (scriptSrc != null))
233         throw new TransformerException  (XSLMessages.createMessage(XSLTErrorResources.ER_ELEM_CONTENT_NOT_ALLOWED, new Object  []{scriptSrc})); 
234         //"Element content not allowed for lang=javaclass " + scriptSrc);
235 
236     // Register the extension namespace if it has not already been registered.
237     ExtensionNamespaceSupport extNsSpt = null;
238     ExtensionNamespacesManager extNsMgr = sroot.getExtensionNamespacesManager();
239     if (extNsMgr.namespaceIndex(declNamespace,
240                                 extNsMgr.getExtensions()) == -1)
241     {
242       if (lang.equals("javaclass"))
243       {
244         if (null == srcURL)
245         {
246            extNsSpt = extNsMgr.defineJavaNamespace(declNamespace);
247         }
248         else if (extNsMgr.namespaceIndex(srcURL,
249                                          extNsMgr.getExtensions()) == -1)
250         {
251           extNsSpt = extNsMgr.defineJavaNamespace(declNamespace, srcURL);
252         }
253       }
254       else  // not java
255       {
256         String   handler = "org.apache.xalan.extensions.ExtensionHandlerGeneral";
257         Object   [] args = {declNamespace, this.m_elements, this.m_functions,
258                           lang, srcURL, scriptSrc, getSystemId()};
259         extNsSpt = new ExtensionNamespaceSupport(declNamespace, handler, args);
260       }
261     }
262     if (extNsSpt != null)
263       extNsMgr.registerExtension(extNsSpt);
264   }
265 
266   
267   /**
268    * This function will be called on top-level elements
269    * only, just before the transform begins.
270    *
271    * @param transformer The XSLT TransformerFactory.
272    *
273    * @throws TransformerException
274    */  
275   public void runtimeInit(TransformerImpl transformer) throws TransformerException  
276   {
277 /*    //System.out.println("ElemExtensionDecl.runtimeInit()");
278     String lang = null;
279     String srcURL = null;
280     String scriptSrc = null;
281     String prefix = getPrefix();
282     String declNamespace = getNamespaceForPrefix(prefix);
283 
284     if (null == declNamespace)
285       throw new TransformerException(XSLMessages.createMessage(XSLTErrorResources.ER_NO_NAMESPACE_DECL, new Object[]{prefix})); 
286       //"Prefix " + prefix does not have a corresponding namespace declaration");
287 
288     for (ElemTemplateElement child = getFirstChildElem(); child != null;
289             child = child.getNextSiblingElem())
290     {
291       if (Constants.ELEMNAME_EXTENSIONSCRIPT == child.getXSLToken())
292       {
293         ElemExtensionScript sdecl = (ElemExtensionScript) child;
294 
295         lang = sdecl.getLang();
296         srcURL = sdecl.getSrc();
297 
298         ElemTemplateElement childOfSDecl = sdecl.getFirstChildElem();
299 
300         if (null != childOfSDecl)
301         {
302           if (Constants.ELEMNAME_TEXTLITERALRESULT
303                   == childOfSDecl.getXSLToken())
304           {
305             ElemTextLiteral tl = (ElemTextLiteral) childOfSDecl;
306             char[] chars = tl.getChars();
307 
308             scriptSrc = new String(chars);
309 
310             if (scriptSrc.trim().length() == 0)
311               scriptSrc = null;
312           }
313         }
314       }
315     }
316 
317     if (null == lang)
318       lang = "javaclass";
319 
320     if (lang.equals("javaclass") && (scriptSrc != null))
321       throw new TransformerException(XSLMessages.createMessage(XSLTErrorResources.ER_ELEM_CONTENT_NOT_ALLOWED, new Object[]{scriptSrc})); 
322       //"Element content not allowed for lang=javaclass " + scriptSrc);
323     
324     // Instantiate a handler for this extension namespace.
325     ExtensionsTable etable = transformer.getExtensionsTable();    
326     ExtensionHandler nsh = etable.get(declNamespace);
327 
328     // If we have no prior ExtensionHandler for this namespace, we need to
329     // create one.
330     // If the script element is for javaclass, this is our special compiled java.
331     // Element content is not supported for this so we throw an exception if
332     // it is provided.  Otherwise, we look up the srcURL to see if we already have
333     // an ExtensionHandler.
334     if (null == nsh)
335     {
336       if (lang.equals("javaclass"))
337       {
338         if (null == srcURL)
339         {
340           nsh = etable.makeJavaNamespace(declNamespace);
341         }
342         else
343         {
344           nsh = etable.get(srcURL);
345 
346           if (null == nsh)
347           {
348             nsh = etable.makeJavaNamespace(srcURL);
349           }
350         }
351       }
352       else  // not java
353       {
354         nsh = new ExtensionHandlerGeneral(declNamespace, this.m_elements,
355                                           this.m_functions, lang, srcURL,
356                                           scriptSrc, getSystemId());
357 
358         // System.out.println("Adding NS Handler: declNamespace = "+
359         //                   declNamespace+", lang = "+lang+", srcURL = "+
360         //                   srcURL+", scriptSrc="+scriptSrc);
361       }
362 
363       etable.addExtensionNamespace(declNamespace, nsh);
364     }*/
365   }
366 }
367
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