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package org.apache.catalina.startup;


import org.apache.catalina.Container;
import org.apache.tomcat.util.digester.Digester;
import org.apache.tomcat.util.digester.Rule;
import org.xml.sax.Attributes;

import java.lang.reflect.Method;


/**
 * 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
 * @version $Revision: 1.3 $ $Date: 2006/03/12 01:27:06 $
 */

public class CopyParentClassLoaderRule extends Rule {


    // ----------------------------------------------------------- Constructors


    /**
     * Construct a new instance of this Rule.
     *
     * @param digester Digester we are associated with
     */
    public CopyParentClassLoaderRule(Digester digester) {

        super(digester);

    }


    // --------------------------------------------------------- Public Methods


    /**
     * Handle the beginning of an XML element.
     *
     * @param attributes The attributes of this element
     *
     * @exception Exception if a processing error occurs
     */
    public void begin(Attributes attributes) throws Exception {

        if (digester.getDebug() >= 1)
            digester.log("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);

    }


}