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Java > Open Source Codes > org > jdom > adapters > 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 JavaDoc;
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 JavaDoc 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 JavaDoc getDocument(InputStream in, boolean validate)
92         throws IOException, JDOMException {
93
94         try {
95             // Load the parser class
96
Class JavaDoc parserClass =
97                 Class.forName("org.apache.xerces.parsers.DOMParser");
98             Object JavaDoc parser = parserClass.newInstance();
99
100             // Set validation
101
Method setFeature = parserClass.getMethod(
102                 "setFeature",
103                 new Class JavaDoc[] {java.lang.String JavaDoc.class, boolean.class});
104             setFeature.invoke(parser,
105                 new Object JavaDoc[] {"http://xml.org/sax/features/validation",
106                 new Boolean JavaDoc(validate)});
107
108             // Set namespaces true
109
setFeature.invoke(parser,
110                 new Object JavaDoc[] {"http://xml.org/sax/features/namespaces",
111                 new Boolean JavaDoc(true)});
112
113             // Set the error handler
114
if (validate) {
115                 Method setErrorHandler = parserClass.getMethod(
116                     "setErrorHandler",
117                     new Class JavaDoc[] {ErrorHandler.class});
118                 setErrorHandler.invoke(parser,
119                     new Object JavaDoc[] {new BuilderErrorHandler()});
120             }
121
122             // Parse the document
123
Method parse = parserClass.getMethod(
124                 "parse",
125                 new Class JavaDoc[] {org.xml.sax.InputSource JavaDoc.class});
126             parse.invoke(parser, new Object JavaDoc[]{new InputSource(in)});
127
128             // Get the Document object
129
Method getDocument = parserClass.getMethod("getDocument", null);
130             Document JavaDoc doc = (Document JavaDoc)getDocument.invoke(parser, null);
131
132             return doc;
133         } catch (InvocationTargetException e) {
134             Throwable JavaDoc targetException = e.getTargetException();
135             if (targetException instanceof org.xml.sax.SAXParseException JavaDoc) {
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 JavaDoc 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 JavaDoc createDocument() throws JDOMException {
162         try {
163             return (Document JavaDoc)Class.forName(
164                 "org.apache.xerces.dom.DocumentImpl").newInstance();
165         } catch (Exception JavaDoc e) {
166             throw new JDOMException(e.getClass().getName() + ": " +
167                                   e.getMessage() + " when creating document", e);
168         }
169     }
170 }
171
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