JAXPDOMAdapter


1   /*-- 
2   
3    $Id: JAXPDOMAdapter.java,v 1.12 2004/02/06 09:28:31 jhunter Exp $
4   
5    Copyright (C) 2000-2004 Jason Hunter & Brett McLaughlin.
6    All rights reserved.
7    
8    Redistribution and use in source and binary forms, with or without
9    modification, are permitted provided that the following conditions
10   are met:
11   
12   1. Redistributions of source code must retain the above copyright
13      notice, this list of conditions, and the following disclaimer.
14   
15   2. Redistributions in binary form must reproduce the above copyright
16      notice, this list of conditions, and the disclaimer that follows 
17      these conditions in the documentation and/or other materials 
18      provided with the distribution.
19  
20   3. The name "JDOM" must not be used to endorse or promote products
21      derived from this software without prior written permission.  For
22      written permission, please contact <request_AT_jdom_DOT_org>.
23   
24   4. Products derived from this software may not be called "JDOM", nor
25      may "JDOM" appear in their name, without prior written permission
26      from the JDOM Project Management <request_AT_jdom_DOT_org>.
27   
28   In addition, we request (but do not require) that you include in the 
29   end-user documentation provided with the redistribution and/or in the 
30   software itself an acknowledgement equivalent to the following:
31       "This product includes software developed by the
32        JDOM Project (http://www.jdom.org/)."
33   Alternatively, the acknowledgment may be graphical using the logos 
34   available at http://www.jdom.org/images/logos.
35  
36   THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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38   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39   DISCLAIMED.  IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
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41   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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44   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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47   SUCH DAMAGE.
48  
49   This software consists of voluntary contributions made by many 
50   individuals on behalf of the JDOM Project and was originally 
51   created by Jason Hunter <jhunter_AT_jdom_DOT_org> and
52   Brett McLaughlin <brett_AT_jdom_DOT_org>.  For more information
53   on the JDOM Project, please see <http://www.jdom.org/>.
54   
55   */
56  
57  package org.jdom.adapters;
58  
59  import java.io.*;
60  import java.lang.reflect.*;
61  
62  import org.jdom.*;
63  import org.jdom.input.*;
64  import org.w3c.dom.Document  ;
65  
66  /**
67   * An adapter for any parser supporting the Sun JAXP APIs.
68   * 
69   * @version $Revision: 1.12 $, $Date: 2004/02/06 09:28:31 $
70   * @author  Jason Hunter
71   */
72  public class JAXPDOMAdapter extends AbstractDOMAdapter {
73  
74      private static final String   CVS_ID = 
75        "@(#) $RCSfile: JAXPDOMAdapter.java,v $ $Revision: 1.12 $ $Date: 2004/02/06 09:28:31 $ $Name:  $";
76  
77      /**
78       * This creates a new <code>{@link Document}</code> from an
79       * existing <code>InputStream</code> by letting a JAXP
80       * parser handle parsing using the supplied stream.
81       *
82       * @param in <code>InputStream</code> to parse.
83       * @param validate <code>boolean</code> to indicate if validation 
84       *        should occur.
85       * @return <code>Document</code> - instance ready for use.
86       * @throws IOException when I/O error occurs.
87       * @throws JDOMException when errors occur in parsing.
88        */
89      public Document   getDocument(InputStream in, boolean validate)
90          throws IOException, JDOMException {
91  
92          try {
93              // Try using JAXP...
94              // Note we need DOM Level 2 and thus JAXP 1.1.
95              Class.forName("javax.xml.transform.Transformer");
96  
97              // Try JAXP 1.1 calls to build the document
98              Class   factoryClass =
99                  Class.forName("javax.xml.parsers.DocumentBuilderFactory");
100 
101             // factory = DocumentBuilderFactory.newInstance();
102             Method newParserInstance =
103                 factoryClass.getMethod("newInstance", null);
104             Object   factory = newParserInstance.invoke(null, null);
105 
106             // factory.setValidating(validate);
107             Method setValidating =
108                 factoryClass.getMethod("setValidating",
109                                    new Class  []{boolean.class});
110             setValidating.invoke(factory,
111                                  new Object  []{new Boolean  (validate)});
112 
113             // factory.setNamespaceAware(true);
114             Method setNamespaceAware =
115                 factoryClass.getMethod("setNamespaceAware",
116                                        new Class  []{boolean.class});
117             setNamespaceAware.invoke(factory,
118                                  new Object  []{Boolean.TRUE});
119     
120             // jaxpParser = factory.newDocumentBuilder();
121             Method newDocBuilder =
122                 factoryClass.getMethod("newDocumentBuilder", null);
123             Object   jaxpParser  = newDocBuilder.invoke(factory, null);
124 
125             // jaxpParser.setErrorHandler(null);
126             Class   parserClass = jaxpParser.getClass();
127             Method setErrorHandler =
128                 parserClass.getMethod("setErrorHandler",
129                                  new Class  []{org.xml.sax.ErrorHandler  .class});
130             setErrorHandler.invoke(jaxpParser,
131                                  new Object  []{new BuilderErrorHandler()});
132 
133             // domDoc = jaxpParser.parse(in);
134             Method parse = parserClass.getMethod(
135                 "parse", new Class  []{InputStream.class});
136             org.w3c.dom.Document   domDoc = (org.w3c.dom.Document  )
137                 parse.invoke(jaxpParser, new Object  []{in});
138 
139             return domDoc;
140         } catch (InvocationTargetException e) {
141             Throwable   targetException = e.getTargetException();
142             if (targetException instanceof IOException) {
143                 throw (IOException) targetException;
144             } else {
145                 throw new JDOMException(targetException.getMessage(), targetException);
146             }
147         } catch (Exception   e) {
148             throw new JDOMException("Reflection failed while parsing a document with JAXP", e); 
149         }
150 
151         // Allow all exceptions to pass through
152     }
153 
154     /**
155      * This creates an empty <code>Document</code> object based
156      * on a specific parser implementation.
157      *
158      * @return <code>Document</code> - created DOM Document.
159      * @throws JDOMException when errors occur in parsing.
160       */
161     public Document   createDocument() 
162         throws JDOMException {
163 
164         try {
165             // We need DOM Level 2 and thus JAXP 1.1.
166             // If JAXP 1.0 is all that's available then we error out.
167             Class.forName("javax.xml.transform.Transformer");
168 
169             // Try JAXP 1.1 calls to build the document
170             Class   factoryClass =
171                 Class.forName("javax.xml.parsers.DocumentBuilderFactory");
172 
173             // factory = DocumentBuilderFactory.newInstance();
174             Method newParserInstance =
175                 factoryClass.getMethod("newInstance", null);
176             Object   factory = newParserInstance.invoke(null, null);
177 
178             // jaxpParser = factory.newDocumentBuilder();
179             Method newDocBuilder =
180                 factoryClass.getMethod("newDocumentBuilder", null);
181             Object   jaxpParser  = newDocBuilder.invoke(factory, null);
182 
183             // domDoc = jaxpParser.newDocument();
184             Class   parserClass = jaxpParser.getClass();
185             Method newDoc = parserClass.getMethod("newDocument", null);
186             org.w3c.dom.Document   domDoc =
187                 (org.w3c.dom.Document  ) newDoc.invoke(jaxpParser, null);
188 
189             return domDoc;
190         } catch (Exception   e) {
191             throw new JDOMException("Reflection failed while creating new JAXP document", e); 
192         }
193 
194     }
195 }
196
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