ParserFeatureSetterFactory


1   /* $Id: ParserFeatureSetterFactory.java 179714 2005-06-03 03:53:39Z skitching $
2    *
3    * Copyright 2004 The Apache Software Foundation.
4    * 
5    * Licensed under the Apache License, Version 2.0 (the "License");
6    * you may not use this file except in compliance with the License.
7    * 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  
19  package org.apache.commons.digester;
20  
21  import java.util.Properties  ;
22  
23  import javax.xml.parsers.ParserConfigurationException  ;
24  import javax.xml.parsers.SAXParser  ;
25  
26  import org.apache.commons.digester.parser.GenericParser;
27  import org.apache.commons.digester.parser.XercesParser;
28  
29  import org.xml.sax.SAXException  ;
30  import org.xml.sax.SAXNotRecognizedException  ;
31  import org.xml.sax.SAXNotSupportedException  ;
32  
33  /**
34   * Creates a <code>SAXParser</code> based on the underlying parser.
35   * Allows logical properties depending on logical parser versions
36   * to be set.
37   *
38   * @since 1.6
39   */
40  public class ParserFeatureSetterFactory{
41  
42      /**
43       * <code>true</code> is Xerces is used.
44       */
45      private static boolean isXercesUsed; 
46  
47      static {
48          try{
49              // Use reflection to avoid a build dependency with Xerces.
50              Class   versionClass = 
51                              Class.forName("org.apache.xerces.impl.Version");
52              isXercesUsed = true;
53          } catch (Exception   ex){
54              isXercesUsed = false;
55          }
56      }
57  
58      /**
59       * Create a new <code>SAXParser</code>
60       * @param properties (logical) properties to be set on parser
61       * @return a <code>SAXParser</code> configured based on the underlying
62       * parser implementation.
63       */
64      public static SAXParser   newSAXParser(Properties   properties)
65              throws ParserConfigurationException  , 
66                     SAXException  ,
67                     SAXNotRecognizedException  , 
68                     SAXNotSupportedException   {
69  
70          if (isXercesUsed){
71              return XercesParser.newSAXParser(properties);
72          } else {
73              return GenericParser.newSAXParser(properties);
74          }
75      }
76  
77  }
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