001: /*
002: * $Header: /home/cvs/jakarta-tomcat-4.0/catalina/src/share/org/apache/catalina/startup/CopyParentClassLoaderRule.java,v 1.2 2001/10/25 00:23:03 craigmcc Exp $
003: * $Revision: 1.2 $
004: * $Date: 2001/10/25 00:23:03 $
005: *
006: * ====================================================================
007: *
008: * The Apache Software License, Version 1.1
009: *
010: * Copyright (c) 1999-2001 The Apache Software Foundation. All rights
011: * reserved.
012: *
013: * Redistribution and use in source and binary forms, with or without
014: * modification, are permitted provided that the following conditions
015: * are met:
016: *
017: * 1. Redistributions of source code must retain the above copyright
018: * notice, this list of conditions and the following disclaimer.
019: *
020: * 2. Redistributions in binary form must reproduce the above copyright
021: * notice, this list of conditions and the following disclaimer in
022: * the documentation and/or other materials provided with the
023: * distribution.
024: *
025: * 3. The end-user documentation included with the redistribution, if
026: * any, must include the following acknowlegement:
027: * "This product includes software developed by the
028: * Apache Software Foundation (http://www.apache.org/)."
029: * Alternately, this acknowlegement may appear in the software itself,
030: * if and wherever such third-party acknowlegements normally appear.
031: *
032: * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
033: * Foundation" must not be used to endorse or promote products derived
034: * from this software without prior written permission. For written
035: * permission, please contact apache@apache.org.
036: *
037: * 5. Products derived from this software may not be called "Apache"
038: * nor may "Apache" appear in their names without prior written
039: * permission of the Apache Group.
040: *
041: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
042: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
043: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
044: * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
045: * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
046: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
047: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
048: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
049: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
050: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
051: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
052: * SUCH DAMAGE.
053: * ====================================================================
054: *
055: * This software consists of voluntary contributions made by many
056: * individuals on behalf of the Apache Software Foundation. For more
057: * information on the Apache Software Foundation, please see
058: * <http://www.apache.org/>.
059: *
060: */
061:
062: package org.apache.catalina.startup;
063:
064: import java.lang.reflect.Method;
065: import org.apache.catalina.Container;
066: import org.apache.commons.digester.Digester;
067: import org.apache.commons.digester.Rule;
068: import org.xml.sax.Attributes;
069:
070: /**
071: * <p>Rule that copies the <code>parentClassLoader</code> property from the
072: * next-to-top item on the stack (which must be a <code>Container</code>)
073: * to the top item on the stack (which must also be a
074: * <code>Container</code>).</p>
075: *
076: * @author Craig R. McClanahan
077: * @version $Revision: 1.2 $ $Date: 2001/10/25 00:23:03 $
078: */
079:
080: public class CopyParentClassLoaderRule extends Rule {
081:
082: // ----------------------------------------------------------- Constructors
083:
084: /**
085: * Construct a new instance of this Rule.
086: *
087: * @param digester Digester we are associated with
088: */
089: public CopyParentClassLoaderRule(Digester digester) {
090:
091: super (digester);
092:
093: }
094:
095: // --------------------------------------------------------- Public Methods
096:
097: /**
098: * Handle the beginning of an XML element.
099: *
100: * @param attributes The attributes of this element
101: *
102: * @exception Exception if a processing error occurs
103: */
104: public void begin(Attributes attributes) throws Exception {
105:
106: if (digester.getDebug() >= 1)
107: digester.log("Copying parent class loader");
108: Container child = (Container) digester.peek(0);
109: Object parent = digester.peek(1);
110: Method method = parent.getClass().getMethod(
111: "getParentClassLoader", new Class[0]);
112: ClassLoader classLoader = (ClassLoader) method.invoke(parent,
113: new Object[0]);
114: child.setParentClassLoader(classLoader);
115:
116: }
117:
118: }
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