ParserFeatureSetterFactory


1   /* $Id: ParserFeatureSetterFactory.java 467222 2006-10-24 03:17:11Z markt $
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one or more
4    * contributor license agreements.  See the NOTICE file distributed with
5    * this work for additional information regarding copyright ownership.
6    * The ASF licenses this file to You under the Apache License, Version 2.0
7    * (the "License"); you may not use this file except in compliance with
8    * the License.  You may obtain a copy of the License at
9    * 
10   *      http://www.apache.org/licenses/LICENSE-2.0
11   * 
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */ 
18  
19  
20  package org.apache.tomcat.util.digester;
21  
22  import java.util.Properties  ;
23  
24  import javax.xml.parsers.ParserConfigurationException  ;
25  import javax.xml.parsers.SAXParser  ;
26  
27  import org.xml.sax.SAXException  ;
28  import org.xml.sax.SAXNotRecognizedException  ;
29  import org.xml.sax.SAXNotSupportedException  ;
30  
31  /**
32   * Creates a <code>SAXParser</code> based on the underlying parser.
33   * Allows logical properties depending on logical parser versions
34   * to be set.
35   *
36   * @since 1.6
37   */
38  public class ParserFeatureSetterFactory{
39  
40      /**
41       * <code>true</code> is Xerces is used.
42       */
43      private static boolean isXercesUsed; 
44  
45      static {
46          try{
47              // Use reflection to avoid a build dependency with Xerces.
48              Class   versionClass = 
49                              Class.forName("org.apache.xerces.impl.Version");
50              isXercesUsed = true;
51          } catch (Exception   ex){
52              isXercesUsed = false;
53          }
54      }
55  
56      /**
57       * Create a new <code>SAXParser</code>
58       * @param properties (logical) properties to be set on parser
59       * @return a <code>SAXParser</code> configured based on the underlying
60       * parser implementation.
61       */
62      public static SAXParser   newSAXParser(Properties   properties)
63              throws ParserConfigurationException  , 
64                     SAXException  ,
65                     SAXNotRecognizedException  , 
66                     SAXNotSupportedException   {
67  
68          if (isXercesUsed){
69              return XercesParser.newSAXParser(properties);
70          } else {
71              return GenericParser.newSAXParser(properties);
72          }
73      }
74  
75  }
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