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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.jasper.compiler;
19  
20  import java.io.FileInputStream;
21  import java.io.FileNotFoundException;
22  import java.io.InputStream;
23  import java.io.PrintWriter;
24  import java.io.StringWriter;
25  import java.net.JarURLConnection;
26  import java.net.URL;
27  import java.util.Collection;
28  import java.util.Enumeration;
29  import java.util.Hashtable;
30  import java.util.Iterator;
31  import java.util.Map;
32  import java.util.Vector;
33  import java.util.jar.JarFile;
34  import java.util.zip.ZipEntry;
35  
36  import javax.servlet.jsp.tagext.FunctionInfo;
37  import javax.servlet.jsp.tagext.PageData;
38  import javax.servlet.jsp.tagext.TagAttributeInfo;
39  import javax.servlet.jsp.tagext.TagExtraInfo;
40  import javax.servlet.jsp.tagext.TagFileInfo;
41  import javax.servlet.jsp.tagext.TagInfo;
42  import javax.servlet.jsp.tagext.TagLibraryInfo;
43  import javax.servlet.jsp.tagext.TagLibraryValidator;
44  import javax.servlet.jsp.tagext.TagVariableInfo;
45  import javax.servlet.jsp.tagext.ValidationMessage;
46  import javax.servlet.jsp.tagext.VariableInfo;
47  
48  import org.apache.jasper.JasperException;
49  import org.apache.jasper.JspCompilationContext;
50  import org.apache.jasper.xmlparser.ParserUtils;
51  import org.apache.jasper.xmlparser.TreeNode;
52  import org.apache.juli.logging.Log;
53  import org.apache.juli.logging.LogFactory;
54  
55  /**
56   * Implementation of the TagLibraryInfo class from the JSP spec.
57   * 
58   * @author Anil K. Vijendran
59   * @author Mandar Raje
60   * @author Pierre Delisle
61   * @author Kin-man Chung
62   * @author Jan Luehe
63   */
64  class TagLibraryInfoImpl extends TagLibraryInfo implements TagConstants {
65  
66      // Logger
67      private Log log = LogFactory.getLog(TagLibraryInfoImpl.class);
68  
69      private JspCompilationContext ctxt;
70      
71      private PageInfo pi;
72  
73      private ErrorDispatcher err;
74  
75      private ParserController parserController;
76  
77      private final void print(String name, String value, PrintWriter w) {
78          if (value != null) {
79              w.print(name + " = {\n\t");
80              w.print(value);
81              w.print("\n}\n");
82          }
83      }
84  
85      public String toString() {
86          StringWriter sw = new StringWriter();
87          PrintWriter out = new PrintWriter(sw);
88          print("tlibversion", tlibversion, out);
89          print("jspversion", jspversion, out);
90          print("shortname", shortname, out);
91          print("urn", urn, out);
92          print("info", info, out);
93          print("uri", uri, out);
94          print("tagLibraryValidator", "" + tagLibraryValidator, out);
95  
96          for (int i = 0; i < tags.length; i++)
97              out.println(tags[i].toString());
98  
99          for (int i = 0; i < tagFiles.length; i++)
100             out.println(tagFiles[i].toString());
101 
102         for (int i = 0; i < functions.length; i++)
103             out.println(functions[i].toString());
104 
105         return sw.toString();
106     }
107 
108     // XXX FIXME
109     // resolveRelativeUri and/or getResourceAsStream don't seem to properly
110     // handle relative paths when dealing when home and getDocBase are set
111     // the following is a workaround until these problems are resolved.
112     private InputStream getResourceAsStream(String uri)
113             throws FileNotFoundException {
114         try {
115             // see if file exists on the filesystem first
116             String real = ctxt.getRealPath(uri);
117             if (real == null) {
118                 return ctxt.getResourceAsStream(uri);
119             } else {
120                 return new FileInputStream(real);
121             }
122         } catch (FileNotFoundException ex) {
123             // if file not found on filesystem, get the resource through
124             // the context
125             return ctxt.getResourceAsStream(uri);
126         }
127 
128     }
129 
130     /**
131      * Constructor.
132      */
133     public TagLibraryInfoImpl(JspCompilationContext ctxt, ParserController pc, PageInfo pi,
134             String prefix, String uriIn, String[] location, ErrorDispatcher err)
135             throws JasperException {
136         super(prefix, uriIn);
137 
138         this.ctxt = ctxt;
139         this.parserController = pc;
140         this.pi = pi;
141         this.err = err;
142         InputStream in = null;
143         JarFile jarFile = null;
144 
145         if (location == null) {
146             // The URI points to the TLD itself or to a JAR file in which the
147             // TLD is stored
148             location = generateTLDLocation(uri, ctxt);
149         }
150 
151         try {
152             if (!location[0].endsWith("jar")) {
153                 // Location points to TLD file
154                 try {
155                     in = getResourceAsStream(location[0]);
156                     if (in == null) {
157                         throw new FileNotFoundException(location[0]);
158                     }
159                 } catch (FileNotFoundException ex) {
160                     err.jspError("jsp.error.file.not.found", location[0]);
161                 }
162 
163                 parseTLD(ctxt, location[0], in, null);
164                 // Add TLD to dependency list
165                 PageInfo pageInfo = ctxt.createCompiler().getPageInfo();
166                 if (pageInfo != null) {
167                     pageInfo.addDependant(location[0]);
168                 }
169             } else {
170                 // Tag library is packaged in JAR file
171                 try {
172                     URL jarFileUrl = new URL("jar:" + location[0] + "!/");
173                     JarURLConnection conn = (JarURLConnection) jarFileUrl
174                             .openConnection();
175                     conn.setUseCaches(false);
176                     conn.connect();
177                     jarFile = conn.getJarFile();
178                     ZipEntry jarEntry = jarFile.getEntry(location[1]);
179                     in = jarFile.getInputStream(jarEntry);
180                     parseTLD(ctxt, location[0], in, jarFileUrl);
181                 } catch (Exception ex) {
182                     err.jspError("jsp.error.tld.unable_to_read", location[0],
183                             location[1], ex.toString());
184                 }
185             }
186         } finally {
187             if (in != null) {
188                 try {
189                     in.close();
190                 } catch (Throwable t) {
191                 }
192             }
193             if (jarFile != null) {
194                 try {
195                     jarFile.close();
196                 } catch (Throwable t) {
197                 }
198             }
199         }
200 
201     }
202 
203     public TagLibraryInfo[] getTagLibraryInfos() {
204         Collection coll = pi.getTaglibs();
205         return (TagLibraryInfo[]) coll.toArray(new TagLibraryInfo[0]);
206     }
207     
208     /*
209      * @param ctxt The JSP compilation context @param uri The TLD's uri @param
210      * in The TLD's input stream @param jarFileUrl The JAR file containing the
211      * TLD, or null if the tag library is not packaged in a JAR
212      */
213     private void parseTLD(JspCompilationContext ctxt, String uri,
214             InputStream in, URL jarFileUrl) throws JasperException {
215         Vector tagVector = new Vector();
216         Vector tagFileVector = new Vector();
217         Hashtable functionTable = new Hashtable();
218 
219         // Create an iterator over the child elements of our <taglib> element
220         ParserUtils pu = new ParserUtils();
221         TreeNode tld = pu.parseXMLDocument(uri, in);
222 
223         // Check to see if the <taglib> root element contains a 'version'
224         // attribute, which was added in JSP 2.0 to replace the <jsp-version>
225         // subelement
226         this.jspversion = tld.findAttribute("version");
227 
228         // Process each child element of our <taglib> element
229         Iterator list = tld.findChildren();
230 
231         while (list.hasNext()) {
232             TreeNode element = (TreeNode) list.next();
233             String tname = element.getName();
234 
235             if ("tlibversion".equals(tname) // JSP 1.1
236                     || "tlib-version".equals(tname)) { // JSP 1.2
237                 this.tlibversion = element.getBody();
238             } else if ("jspversion".equals(tname)
239                     || "jsp-version".equals(tname)) {
240                 this.jspversion = element.getBody();
241             } else if ("shortname".equals(tname) || "short-name".equals(tname))
242                 this.shortname = element.getBody();
243             else if ("uri".equals(tname))
244                 this.urn = element.getBody();
245             else if ("info".equals(tname) || "description".equals(tname))
246                 this.info = element.getBody();
247             else if ("validator".equals(tname))
248                 this.tagLibraryValidator = createValidator(element);
249             else if ("tag".equals(tname))
250                 tagVector.addElement(createTagInfo(element, jspversion));
251             else if ("tag-file".equals(tname)) {
252                 TagFileInfo tagFileInfo = createTagFileInfo(element, uri,
253                         jarFileUrl);
254                 tagFileVector.addElement(tagFileInfo);
255             } else if ("function".equals(tname)) { // JSP2.0
256                 FunctionInfo funcInfo = createFunctionInfo(element);
257                 String funcName = funcInfo.getName();
258                 if (functionTable.containsKey(funcName)) {
259                     err.jspError("jsp.error.tld.fn.duplicate.name", funcName,
260                             uri);
261 
262                 }
263                 functionTable.put(funcName, funcInfo);
264             } else if ("display-name".equals(tname) || // Ignored elements
265                     "small-icon".equals(tname) || "large-icon".equals(tname)
266                     || "listener".equals(tname)) {
267                 ;
268             } else if ("taglib-extension".equals(tname)) {
269                 // Recognized but ignored
270             } else {
271                 if (log.isWarnEnabled()) {
272                     log.warn(Localizer.getMessage(
273                             "jsp.warning.unknown.element.in.taglib", tname));
274                 }
275             }
276 
277         }
278 
279         if (tlibversion == null) {
280             err.jspError("jsp.error.tld.mandatory.element.missing",
281                     "tlib-version");
282         }
283         if (jspversion == null) {
284             err.jspError("jsp.error.tld.mandatory.element.missing",
285                     "jsp-version");
286         }
287 
288         this.tags = new TagInfo[tagVector.size()];
289         tagVector.copyInto(this.tags);
290 
291         this.tagFiles = new TagFileInfo[tagFileVector.size()];
292         tagFileVector.copyInto(this.tagFiles);
293 
294         this.functions = new FunctionInfo[functionTable.size()];
295         int i = 0;
296         Enumeration enumeration = functionTable.elements();
297         while (enumeration.hasMoreElements()) {
298             this.functions[i++] = (FunctionInfo) enumeration.nextElement();
299         }
300     }
301 
302     /*
303      * @param uri The uri of the TLD @param ctxt The compilation context
304      * 
305      * @return String array whose first element denotes the path to the TLD. If
306      * the path to the TLD points to a jar file, then the second element denotes
307      * the name of the TLD entry in the jar file, which is hardcoded to
308      * META-INF/taglib.tld.
309      */
310     private String[] generateTLDLocation(String uri, JspCompilationContext ctxt)
311             throws JasperException {
312 
313         int uriType = TldLocationsCache.uriType(uri);
314         if (uriType == TldLocationsCache.ABS_URI) {
315             err.jspError("jsp.error.taglibDirective.absUriCannotBeResolved",
316                     uri);
317         } else if (uriType == TldLocationsCache.NOROOT_REL_URI) {
318             uri = ctxt.resolveRelativeUri(uri);
319         }
320 
321         String[] location = new String[2];
322         location[0] = uri;
323         if (location[0].endsWith("jar")) {
324             URL url = null;
325             try {
326                 url = ctxt.getResource(location[0]);
327             } catch (Exception ex) {
328                 err.jspError("jsp.error.tld.unable_to_get_jar", location[0], ex
329                         .toString());
330             }
331             if (url == null) {
332                 err.jspError("jsp.error.tld.missing_jar", location[0]);
333             }
334             location[0] = url.toString();
335             location[1] = "META-INF/taglib.tld";
336         }
337 
338         return location;
339     }
340 
341     private TagInfo createTagInfo(TreeNode elem, String jspVersion)
342             throws JasperException {
343 
344         String tagName = null;
345         String tagClassName = null;
346         String teiClassName = null;
347 
348         /*
349          * Default body content for JSP 1.2 tag handlers (<body-content> has
350          * become mandatory in JSP 2.0, because the default would be invalid for
351          * simple tag handlers)
352          */
353         String bodycontent = "JSP";
354 
355         String info = null;
356         String displayName = null;
357         String smallIcon = null;
358         String largeIcon = null;
359         boolean dynamicAttributes = false;
360 
361         Vector attributeVector = new Vector();
362         Vector variableVector = new Vector();
363         Iterator list = elem.findChildren();
364         while (list.hasNext()) {
365             TreeNode element = (TreeNode) list.next();
366             String tname = element.getName();
367 
368             if ("name".equals(tname)) {
369                 tagName = element.getBody();
370             } else if ("tagclass".equals(tname) || "tag-class".equals(tname)) {
371                 tagClassName = element.getBody();
372             } else if ("teiclass".equals(tname) || "tei-class".equals(tname)) {
373                 teiClassName = element.getBody();
374             } else if ("bodycontent".equals(tname)
375                     || "body-content".equals(tname)) {
376                 bodycontent = element.getBody();
377             } else if ("display-name".equals(tname)) {
378                 displayName = element.getBody();
379             } else if ("small-icon".equals(tname)) {
380                 smallIcon = element.getBody();
381             } else if ("large-icon".equals(tname)) {
382                 largeIcon = element.getBody();
383             } else if ("icon".equals(tname)) {
384                 TreeNode icon = element.findChild("small-icon");
385                 if (icon != null) {
386                     smallIcon = icon.getBody();
387                 }
388                 icon = element.findChild("large-icon");
389                 if (icon != null) {
390                     largeIcon = icon.getBody();
391                 }
392             } else if ("info".equals(tname) || "description".equals(tname)) {
393                 info = element.getBody();
394             } else if ("variable".equals(tname)) {
395                 variableVector.addElement(createVariable(element));
396             } else if ("attribute".equals(tname)) {
397                 attributeVector
398                         .addElement(createAttribute(element, jspVersion));
399             } else if ("dynamic-attributes".equals(tname)) {
400                 dynamicAttributes = JspUtil.booleanValue(element.getBody());
401             } else if ("example".equals(tname)) {
402                 // Ignored elements
403             } else if ("tag-extension".equals(tname)) {
404                 // Ignored
405             } else {
406                 if (log.isWarnEnabled()) {
407                     log.warn(Localizer.getMessage(
408                             "jsp.warning.unknown.element.in.tag", tname));
409                 }
410             }
411         }
412 
413         TagExtraInfo tei = null;
414         if (teiClassName != null && !teiClassName.equals("")) {
415             try {
416                 Class teiClass = ctxt.getClassLoader().loadClass(teiClassName);
417                 tei = (TagExtraInfo) teiClass.newInstance();
418             } catch (Exception e) {
419                 err.jspError("jsp.error.teiclass.instantiation", teiClassName,
420                         e);
421             }
422         }
423 
424         TagAttributeInfo[] tagAttributeInfo = new TagAttributeInfo[attributeVector
425                 .size()];
426         attributeVector.copyInto(tagAttributeInfo);
427 
428         TagVariableInfo[] tagVariableInfos = new TagVariableInfo[variableVector
429                 .size()];
430         variableVector.copyInto(tagVariableInfos);
431 
432         TagInfo taginfo = new TagInfo(tagName, tagClassName, bodycontent, info,
433                 this, tei, tagAttributeInfo, displayName, smallIcon, largeIcon,
434                 tagVariableInfos, dynamicAttributes);
435         return taginfo;
436     }
437 
438     /*
439      * Parses the tag file directives of the given TagFile and turns them into a
440      * TagInfo.
441      * 
442      * @param elem The <tag-file> element in the TLD @param uri The location of
443      * the TLD, in case the tag file is specified relative to it @param jarFile
444      * The JAR file, in case the tag file is packaged in a JAR
445      * 
446      * @return TagInfo correspoding to tag file directives
447      */
448     private TagFileInfo createTagFileInfo(TreeNode elem, String uri,
449             URL jarFileUrl) throws JasperException {
450 
451         String name = null;
452         String path = null;
453 
454         Iterator list = elem.findChildren();
455         while (list.hasNext()) {
456             TreeNode child = (TreeNode) list.next();
457             String tname = child.getName();
458             if ("name".equals(tname)) {
459                 name = child.getBody();
460             } else if ("path".equals(tname)) {
461                 path = child.getBody();
462             } else if ("example".equals(tname)) {
463                 // Ignore <example> element: Bugzilla 33538
464             } else if ("tag-extension".equals(tname)) {
465                 // Ignore <tag-extension> element: Bugzilla 33538
466             } else if ("icon".equals(tname) 
467                     || "display-name".equals(tname) 
468                     || "description".equals(tname)) {
469                 // Ignore these elements: Bugzilla 38015
470             } else {
471                 if (log.isWarnEnabled()) {
472                     log.warn(Localizer.getMessage(
473                             "jsp.warning.unknown.element.in.tagfile", tname));
474                 }
475             }
476         }
477 
478         if (path.startsWith("/META-INF/tags")) {
479             // Tag file packaged in JAR
480             // See https://issues.apache.org/bugzilla/show_bug.cgi?id=46471
481             // This needs to be removed once all the broken code that depends on
482             // it has been removed
483             ctxt.setTagFileJarUrl(path, jarFileUrl);
484         } else if (!path.startsWith("/WEB-INF/tags")) {
485             err.jspError("jsp.error.tagfile.illegalPath", path);
486         }
487 
488         TagInfo tagInfo = TagFileProcessor.parseTagFileDirectives(
489                 parserController, name, path, jarFileUrl, this);
490         return new TagFileInfo(name, path, tagInfo);
491     }
492 
493     TagAttributeInfo createAttribute(TreeNode elem, String jspVersion) {
494         String name = null;
495         String type = null;
496         String expectedType = null;
497         String methodSignature = null;
498         boolean required = false, rtexprvalue = false, reqTime = false, isFragment = false, deferredValue = false, deferredMethod = false;
499 
500         Iterator list = elem.findChildren();
501         while (list.hasNext()) {
502             TreeNode element = (TreeNode) list.next();
503             String tname = element.getName();
504 
505             if ("name".equals(tname)) {
506                 name = element.getBody();
507             } else if ("required".equals(tname)) {
508                 String s = element.getBody();
509                 if (s != null)
510                     required = JspUtil.booleanValue(s);
511             } else if ("rtexprvalue".equals(tname)) {
512                 String s = element.getBody();
513                 if (s != null)
514                     rtexprvalue = JspUtil.booleanValue(s);
515             } else if ("type".equals(tname)) {
516                 type = element.getBody();
517                 if ("1.2".equals(jspVersion)
518                         && (type.equals("Boolean") || type.equals("Byte")
519                                 || type.equals("Character")
520                                 || type.equals("Double")
521                                 || type.equals("Float")
522                                 || type.equals("Integer")
523                                 || type.equals("Long") || type.equals("Object")
524                                 || type.equals("Short") || type
525                                 .equals("String"))) {
526                     type = "java.lang." + type;
527                 }
528             } else if ("fragment".equals(tname)) {
529                 String s = element.getBody();
530                 if (s != null) {
531                     isFragment = JspUtil.booleanValue(s);
532                 }
533             } else if ("deferred-value".equals(tname)) {
534                 deferredValue = true;
535                 type = "javax.el.ValueExpression";
536                 TreeNode child = element.findChild("type");
537                 if (child != null) {
538                     expectedType = child.getBody();
539                     if (expectedType != null) {
540                         expectedType = expectedType.trim();
541                     }
542                 } else {
543                     expectedType = "java.lang.Object";
544                 }
545             } else if ("deferred-method".equals(tname)) {
546                 deferredMethod = true;
547                 type = "javax.el.MethodExpression";
548                 TreeNode child = element.findChild("method-signature");
549                 if (child != null) {
550                     methodSignature = child.getBody();
551                     if (methodSignature != null) {
552                         methodSignature = methodSignature.trim();
553                     }
554                 } else {
555                     methodSignature = "java.lang.Object method()";
556                 }
557             } else if ("description".equals(tname) || // Ignored elements
558             false) {
559                 ;
560             } else {
561                 if (log.isWarnEnabled()) {
562                     log.warn(Localizer.getMessage(
563                             "jsp.warning.unknown.element.in.attribute", tname));
564                 }
565             }
566         }
567 
568         if (isFragment) {
569             /*
570              * According to JSP.C-3 ("TLD Schema Element Structure - tag"),
571              * 'type' and 'rtexprvalue' must not be specified if 'fragment' has
572              * been specified (this will be enforced by validating parser).
573              * Also, if 'fragment' is TRUE, 'type' is fixed at
574              * javax.servlet.jsp.tagext.JspFragment, and 'rtexprvalue' is fixed
575              * at true. See also JSP.8.5.2.
576              */
577             type = "javax.servlet.jsp.tagext.JspFragment";
578             rtexprvalue = true;
579         }
580 
581         if (!rtexprvalue && type == null) {
582             // According to JSP spec, for static values (those determined at
583             // translation time) the type is fixed at java.lang.String.
584             type = "java.lang.String";
585         }
586         
587         return new TagAttributeInfo(name, required, type, rtexprvalue,
588                 isFragment, null, deferredValue, deferredMethod, expectedType,
589                 methodSignature);
590     }
591 
592     TagVariableInfo createVariable(TreeNode elem) {
593         String nameGiven = null;
594         String nameFromAttribute = null;
595         String className = "java.lang.String";
596         boolean declare = true;
597         int scope = VariableInfo.NESTED;
598 
599         Iterator list = elem.findChildren();
600         while (list.hasNext()) {
601             TreeNode element = (TreeNode) list.next();
602             String tname = element.getName();
603             if ("name-given".equals(tname))
604                 nameGiven = element.getBody();
605             else if ("name-from-attribute".equals(tname))
606                 nameFromAttribute = element.getBody();
607             else if ("variable-class".equals(tname))
608                 className = element.getBody();
609             else if ("declare".equals(tname)) {
610                 String s = element.getBody();
611                 if (s != null)
612                     declare = JspUtil.booleanValue(s);
613             } else if ("scope".equals(tname)) {
614                 String s = element.getBody();
615                 if (s != null) {
616                     if ("NESTED".equals(s)) {
617                         scope = VariableInfo.NESTED;
618                     } else if ("AT_BEGIN".equals(s)) {
619                         scope = VariableInfo.AT_BEGIN;
620                     } else if ("AT_END".equals(s)) {
621                         scope = VariableInfo.AT_END;
622                     }
623                 }
624             } else if ("description".equals(tname) || // Ignored elements
625             false) {
626             } else {
627                 if (log.isWarnEnabled()) {
628                     log.warn(Localizer.getMessage(
629                             "jsp.warning.unknown.element.in.variable", tname));
630                 }
631             }
632         }
633         return new TagVariableInfo(nameGiven, nameFromAttribute, className,
634                 declare, scope);
635     }
636 
637     private TagLibraryValidator createValidator(TreeNode elem)
638             throws JasperException {
639 
640         String validatorClass = null;
641         Map initParams = new Hashtable();
642 
643         Iterator list = elem.findChildren();
644         while (list.hasNext()) {
645             TreeNode element = (TreeNode) list.next();
646             String tname = element.getName();
647             if ("validator-class".equals(tname))
648                 validatorClass = element.getBody();
649             else if ("init-param".equals(tname)) {
650                 String[] initParam = createInitParam(element);
651                 initParams.put(initParam[0], initParam[1]);
652             } else if ("description".equals(tname) || // Ignored elements
653             false) {
654             } else {
655                 if (log.isWarnEnabled()) {
656                     log.warn(Localizer.getMessage(
657                             "jsp.warning.unknown.element.in.validator", tname));
658                 }
659             }
660         }
661 
662         TagLibraryValidator tlv = null;
663         if (validatorClass != null && !validatorClass.equals("")) {
664             try {
665                 Class tlvClass = ctxt.getClassLoader()
666                         .loadClass(validatorClass);
667                 tlv = (TagLibraryValidator) tlvClass.newInstance();
668             } catch (Exception e) {
669                 err.jspError("jsp.error.tlvclass.instantiation",
670                         validatorClass, e);
671             }
672         }
673         if (tlv != null) {
674             tlv.setInitParameters(initParams);
675         }
676         return tlv;
677     }
678 
679     String[] createInitParam(TreeNode elem) {
680         String[] initParam = new String[2];
681 
682         Iterator list = elem.findChildren();
683         while (list.hasNext()) {
684             TreeNode element = (TreeNode) list.next();
685             String tname = element.getName();
686             if ("param-name".equals(tname)) {
687                 initParam[0] = element.getBody();
688             } else if ("param-value".equals(tname)) {
689                 initParam[1] = element.getBody();
690             } else if ("description".equals(tname)) {
691                  // Do nothing
692             } else {
693                 if (log.isWarnEnabled()) {
694                     log.warn(Localizer.getMessage(
695                             "jsp.warning.unknown.element.in.initParam", tname));
696                 }
697             }
698         }
699         return initParam;
700     }
701 
702     FunctionInfo createFunctionInfo(TreeNode elem) {
703 
704         String name = null;
705         String klass = null;
706         String signature = null;
707 
708         Iterator list = elem.findChildren();
709         while (list.hasNext()) {
710             TreeNode element = (TreeNode) list.next();
711             String tname = element.getName();
712 
713             if ("name".equals(tname)) {
714                 name = element.getBody();
715             } else if ("function-class".equals(tname)) {
716                 klass = element.getBody();
717             } else if ("function-signature".equals(tname)) {
718                 signature = element.getBody();
719             } else if ("display-name".equals(tname) || // Ignored elements
720                     "small-icon".equals(tname) || "large-icon".equals(tname)
721                     || "description".equals(tname) || "example".equals(tname)) {
722             } else {
723                 if (log.isWarnEnabled()) {
724                     log.warn(Localizer.getMessage(
725                             "jsp.warning.unknown.element.in.function", tname));
726                 }
727             }
728         }
729 
730         return new FunctionInfo(name, klass, signature);
731     }
732 
733     // *********************************************************************
734     // Until javax.servlet.jsp.tagext.TagLibraryInfo is fixed
735 
736     /**
737      * The instance (if any) for the TagLibraryValidator class.
738      * 
739      * @return The TagLibraryValidator instance, if any.
740      */
741     public TagLibraryValidator getTagLibraryValidator() {
742         return tagLibraryValidator;
743     }
744 
745     /**
746      * Translation-time validation of the XML document associated with the JSP
747      * page. This is a convenience method on the associated TagLibraryValidator
748      * class.
749      * 
750      * @param thePage
751      *            The JSP page object
752      * @return A string indicating whether the page is valid or not.
753      */
754     public ValidationMessage[] validate(PageData thePage) {
755         TagLibraryValidator tlv = getTagLibraryValidator();
756         if (tlv == null)
757             return null;
758 
759         String uri = getURI();
760         if (uri.startsWith("/")) {
761             uri = URN_JSPTLD + uri;
762         }
763 
764         return tlv.validate(getPrefixString(), uri, thePage);
765     }
766 
767     protected TagLibraryValidator tagLibraryValidator;
768 }