XercesDOMAdapter


1   /*-- 
2   
3    $Id: XercesDOMAdapter.java,v 1.18 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
37   WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38   OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39   DISCLAIMED.  IN NO EVENT SHALL THE JDOM AUTHORS OR THE PROJECT
40   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
43   USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
44   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45   OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46   OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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  import org.xml.sax.*;
66  
67  /**
68   * An adapter for the Apache Xerces DOM parser.
69   * 
70   * @version $Revision: 1.18 $, $Date: 2004/02/06 09:28:31 $
71   * @author  Brett McLaughlin
72   * @author  Jason Hunter
73   */
74  public class XercesDOMAdapter extends AbstractDOMAdapter {
75  
76      private static final String   CVS_ID = 
77        "@(#) $RCSfile: XercesDOMAdapter.java,v $ $Revision: 1.18 $ $Date: 2004/02/06 09:28:31 $ $Name:  $";
78  
79      /**
80       * This creates a new <code>{@link Document}</code> from an
81       * existing <code>InputStream</code> by letting a DOM
82       * parser handle parsing using the supplied stream.
83       *
84       * @param in <code>InputStream</code> to parse.
85       * @param validate <code>boolean</code> to indicate if validation 
86       * should occur.
87       * @return <code>Document</code> - instance ready for use.
88       * @throws IOException when I/O error occurs.
89       * @throws JDOMException when errors occur in parsing.
90       */
91      public Document   getDocument(InputStream in, boolean validate)
92          throws IOException, JDOMException  {
93  
94          try {
95              // Load the parser class
96              Class   parserClass =
97                  Class.forName("org.apache.xerces.parsers.DOMParser");
98              Object   parser = parserClass.newInstance();
99  
100             // Set validation
101             Method setFeature = parserClass.getMethod(
102                 "setFeature",
103                 new Class  [] {java.lang.String  .class, boolean.class});
104             setFeature.invoke(parser, 
105                 new Object  [] {"http://xml.org/sax/features/validation",
106                 new Boolean  (validate)});
107 
108             // Set namespaces true
109             setFeature.invoke(parser,
110                 new Object  [] {"http://xml.org/sax/features/namespaces",
111                 new Boolean  (true)});
112 
113             // Set the error handler
114             if (validate) {
115                 Method setErrorHandler = parserClass.getMethod(
116                     "setErrorHandler",
117                     new Class  [] {ErrorHandler.class});
118                 setErrorHandler.invoke(parser,
119                     new Object  [] {new BuilderErrorHandler()});
120             }
121 
122             // Parse the document
123             Method parse = parserClass.getMethod(
124                 "parse",
125                 new Class  [] {org.xml.sax.InputSource  .class});
126             parse.invoke(parser, new Object  []{new InputSource(in)});
127 
128             // Get the Document object
129             Method getDocument = parserClass.getMethod("getDocument", null);
130             Document   doc = (Document  )getDocument.invoke(parser, null);
131 
132             return doc;
133         } catch (InvocationTargetException e) {
134             Throwable   targetException = e.getTargetException();
135             if (targetException instanceof org.xml.sax.SAXParseException  ) {
136                 SAXParseException parseException =
137                     (SAXParseException)targetException;
138                 throw new JDOMException("Error on line " +
139                                       parseException.getLineNumber() +
140                                       " of XML document: " +
141                                       parseException.getMessage(), e);
142             } else if (targetException instanceof IOException) {
143                 IOException ioException = (IOException) targetException;
144                 throw ioException;
145             } else {
146                 throw new JDOMException(targetException.getMessage(), e);
147             }
148         } catch (Exception   e) {
149             throw new JDOMException(e.getClass().getName() + ": " +
150                                   e.getMessage(), e);
151         }
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.
160      */
161     public Document   createDocument() throws JDOMException {
162         try {
163             return (Document  )Class.forName(
164                 "org.apache.xerces.dom.DocumentImpl").newInstance();
165         } catch (Exception   e) {
166             throw new JDOMException(e.getClass().getName() + ": " +
167                                   e.getMessage() + " when creating document", e);
168         }
169     }
170 }
171
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