Log4jEntityResolver


1   /*
2    * Copyright 1999-2005 The Apache Software Foundation.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    * 
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    * 
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.apache.log4j.xml;
18  
19  import java.io.InputStream  ;
20  import java.io.ByteArrayOutputStream  ;
21  import java.io.ByteArrayInputStream  ;
22  import java.io.IOException  ;
23  
24  import org.xml.sax.EntityResolver  ;
25  import org.xml.sax.InputSource  ;
26  
27  import org.apache.log4j.helpers.LogLog;
28  
29  /**
30   * An {@link EntityResolver} specifically designed to return
31   * <code>log4j.dtd</code> which is embedded within the log4j jar
32   * file. 
33   *
34   * @author Paul Austin
35   * */
36  public class Log4jEntityResolver implements EntityResolver   {
37  
38    public InputSource   resolveEntity (String   publicId, String   systemId) {
39      if (systemId.endsWith("log4j.dtd")) {
40        Class   clazz = getClass();
41        InputStream   in = clazz.getResourceAsStream("/org/apache/log4j/xml/log4j.dtd");
42        if (in == null) {
43      LogLog.error("Could not find [log4j.dtd]. Used [" + clazz.getClassLoader() 
44               + "] class loader in the search.");
45      return null;
46        } else {
47      return new InputSource  (in);
48        }
49      } else {
50        return null;
51      }
52    }
53  }
54
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