DocumentReader


1   /* ***** BEGIN LICENSE BLOCK *****
2    * Version: MPL 1.1
3    * The contents of this file are subject to the Mozilla Public License Version
4    * 1.1 (the "License"); you may not use this file except in compliance with
5    * the License. You may obtain a copy of the License at
6    * http://www.mozilla.org/MPL/
7    * 
8    * Software distributed under the License is distributed on an "AS IS" basis,
9    * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10   * for the specific language governing rights and limitations under the
11   * License.
12   * 
13   * The Original Code is Riot.
14   * 
15   * The Initial Developer of the Original Code is
16   * Neteye GmbH.
17   * Portions created by the Initial Developer are Copyright (C) 2006
18   * the Initial Developer. All Rights Reserved.
19   * 
20   * Contributor(s):
21   *   Felix Gnass [fgnass at neteye dot de]
22   * 
23   * ***** END LICENSE BLOCK ***** */
24  package org.riotfamily.common.xml;
25  
26  import org.apache.commons.logging.Log;
27  import org.apache.commons.logging.LogFactory;
28  import org.springframework.beans.factory.xml.DefaultDocumentLoader;
29  import org.springframework.beans.factory.xml.DocumentLoader;
30  import org.springframework.core.io.Resource;
31  import org.springframework.util.xml.SimpleSaxErrorHandler;
32  import org.w3c.dom.Document  ;
33  import org.xml.sax.EntityResolver  ;
34  import org.xml.sax.ErrorHandler  ;
35  import org.xml.sax.InputSource  ;
36  
37  /**
38   * Convinience class to read a XML document from a 
39   * {@link org.springframework.core.io.Resource resource}.
40   */
41  public class DocumentReader {
42  
43      protected static final int VALIDATION_MODE_NONE = 0;
44          
45      private static Log log = LogFactory.getLog(DocumentReader.class);
46          
47      private Resource resource;
48      
49      private ErrorHandler errorHandler = new SimpleSaxErrorHandler(log);
50  
51      private DocumentLoader loader = new DefaultDocumentLoader();
52      
53      public DocumentReader(Resource resource) {
54          this.resource = resource;
55      }
56      
57      protected int getValidationMode() {
58          return VALIDATION_MODE_NONE;
59      }
60      
61      protected EntityResolver   getEntityResolver() {
62          return null;
63      }
64      
65      public Document   readDocument() {
66          try {
67              InputSource   source = new InputSource  (resource.getInputStream());
68              return loader.loadDocument(source, getEntityResolver(), errorHandler, 
69                      getValidationMode(), true);
70          }
71          catch (RuntimeException   e) {
72              throw e;
73          }
74          catch (Exception   e) {
75              throw new DocumentReaderException(resource, e);
76          }
77      }
78  
79  }
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