CopyParentClassLoaderRule


1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  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.catalina.startup;
20  
21  
22  import java.lang.reflect.Method  ;
23  import org.apache.catalina.Container;
24  import org.apache.tomcat.util.digester.Rule;
25  import org.xml.sax.Attributes  ;
26  
27  
28  /**
29   * <p>Rule that copies the <code>parentClassLoader</code> property from the
30   * next-to-top item on the stack (which must be a <code>Container</code>)
31   * to the top item on the stack (which must also be a
32   * <code>Container</code>).</p>
33   *
34   * @author Craig R. McClanahan
35   * @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
36   */
37  
38  public class CopyParentClassLoaderRule extends Rule {
39  
40  
41      // ----------------------------------------------------------- Constructors
42  
43  
44      /**
45       * Construct a new instance of this Rule.
46       */
47      public CopyParentClassLoaderRule() {
48      }
49  
50  
51      // --------------------------------------------------------- Public Methods
52  
53  
54      /**
55       * Handle the beginning of an XML element.
56       *
57       * @param attributes The attributes of this element
58       *
59       * @exception Exception if a processing error occurs
60       */
61      public void begin(String   namespace, String   name, Attributes   attributes)
62          throws Exception   {
63  
64          if (digester.getLogger().isDebugEnabled())
65              digester.getLogger().debug("Copying parent class loader");
66          Container child = (Container) digester.peek(0);
67          Object   parent = digester.peek(1);
68          Method   method =
69              parent.getClass().getMethod("getParentClassLoader", new Class  [0]);
70          ClassLoader   classLoader =
71              (ClassLoader  ) method.invoke(parent, new Object  [0]);
72          child.setParentClassLoader(classLoader);
73  
74      }
75  
76  
77  }
78
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