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Tomcat example source code file (SetNextNamingRule.java)

This example Tomcat source code file (SetNextNamingRule.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

context, exception, namingresources, namingresources, object, object, rule, setnextnamingrule, setnextnamingrule, setnextrule, string, string, stringbuffer

The Tomcat SetNextNamingRule.java source code

/* $Id: SetNextNamingRule.java 467222 2006-10-24 03:17:11Z markt $
 *
 * 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 org.apache.catalina.Context;
import org.apache.catalina.deploy.NamingResources;
import org.apache.tomcat.util.IntrospectionUtils;
import org.apache.tomcat.util.digester.Rule;


/**
 * <p>Rule implementation that calls a method on the (top-1) (parent)
 * object, passing the top object (child) as an argument.  It is
 * commonly used to establish parent-child relationships.</p>
 *
 * <p>This rule now supports more flexible method matching by default.
 * It is possible that this may break (some) code 
 * written against release 1.1.1 or earlier.
 * </p> 
 */

public class SetNextNamingRule extends Rule {


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

    
    /**
     * Construct a "set next" rule with the specified method name.
     *
     * @param methodName Method name of the parent method to call
     * @param paramType Java class of the parent method's argument
     *  (if you wish to use a primitive type, specify the corresonding
     *  Java wrapper class instead, such as <code>java.lang.Boolean
     *  for a <code>boolean parameter)
     */
    public SetNextNamingRule(String methodName,
                       String paramType) {

        this.methodName = methodName;
        this.paramType = paramType;

    }


    // ----------------------------------------------------- Instance Variables


    /**
     * The method name to call on the parent object.
     */
    protected String methodName = null;


    /**
     * The Java class name of the parameter type expected by the method.
     */
    protected String paramType = null;


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


    /**
     * Process the end of this element.
     */
    public void end() throws Exception {

        // Identify the objects to be used
        Object child = digester.peek(0);
        Object parent = digester.peek(1);

        NamingResources namingResources = null;
        if (parent instanceof Context) {
            namingResources = ((Context) parent).getNamingResources();
        } else {
            namingResources = (NamingResources) parent;
        }
        
        // Call the specified method
        IntrospectionUtils.callMethod1(namingResources, methodName,
                child, paramType, digester.getClassLoader());

    }


    /**
     * Render a printable version of this Rule.
     */
    public String toString() {

        StringBuffer sb = new StringBuffer("SetNextRule[");
        sb.append("methodName=");
        sb.append(methodName);
        sb.append(", paramType=");
        sb.append(paramType);
        sb.append("]");
        return (sb.toString());

    }


}

Other Tomcat examples (source code examples)

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