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Java > Open Source Codes > org > apache > catalina > startup > 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 JavaDoc;
23 import org.apache.catalina.Container;
24 import org.apache.tomcat.util.digester.Rule;
25 import org.xml.sax.Attributes JavaDoc;
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 JavaDoc namespace, String JavaDoc name, Attributes JavaDoc attributes)
62         throws Exception JavaDoc {
63
64         if (digester.getLogger().isDebugEnabled())
65             digester.getLogger().debug("Copying parent class loader");
66         Container child = (Container) digester.peek(0);
67         Object JavaDoc parent = digester.peek(1);
68         Method JavaDoc method =
69             parent.getClass().getMethod("getParentClassLoader", new Class JavaDoc[0]);
70         ClassLoader JavaDoc classLoader =
71             (ClassLoader JavaDoc) method.invoke(parent, new Object JavaDoc[0]);
72         child.setParentClassLoader(classLoader);
73
74     }
75
76
77 }
78
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