org.apache.catalina.startup.CopyParentClassLoaderRule Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.catalina.startup;
import java.lang.reflect.Method;
import org.apache.catalina.Container;
import org.apache.tomcat.util.digester.Rule;
import org.xml.sax.Attributes;
/**
* Rule that copies the parentClassLoader property from the
* next-to-top item on the stack (which must be a Container)
* to the top item on the stack (which must also be a
* Container).
*
* @author Craig R. McClanahan
*/
public class CopyParentClassLoaderRule extends Rule {
// ----------------------------------------------------------- Constructors
/**
* Construct a new instance of this Rule.
*/
public CopyParentClassLoaderRule() {
}
// --------------------------------------------------------- Public Methods
/**
* Handle the beginning of an XML element.
*
* @param attributes The attributes of this element
*
* @exception Exception if a processing error occurs
*/
@Override
public void begin(String namespace, String name, Attributes attributes)
throws Exception {
if (digester.getLogger().isDebugEnabled()) {
digester.getLogger().debug("Copying parent class loader");
}
Container child = (Container) digester.peek(0);
Object parent = digester.peek(1);
Method method =
parent.getClass().getMethod("getParentClassLoader", new Class[0]);
ClassLoader classLoader =
(ClassLoader) method.invoke(parent, new Object[0]);
child.setParentClassLoader(classLoader);
StringBuilder code = digester.getGeneratedCode();
if (code != null) {
code.append(digester.toVariableName(child)).append(".setParentClassLoader(");
code.append(digester.toVariableName(parent)).append(".getParentClassLoader());");
code.append(System.lineSeparator());
}
}
}