Commons Digester example source code file (RuleLoader.java)

This example Commons Digester source code file (RuleLoader.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 - Commons Digester tags/keywords

pluginexception, pluginexception, ruleloader, ruleloader, string, string

The Commons Digester RuleLoader.java source code

/* $Id: RuleLoader.java 992060 2010-09-02 19:09:47Z simonetripodi $
 *
 * 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.commons.digester.plugins;

import org.apache.commons.digester.Digester;

/**
 * Interface for classes which can dynamically load custom
 * plugin rules associated with a user's plugin class.
 * <p>
 * Each plugin declaration has an associated RuleLoader instance, and that
 * instance's addRules method is invoked each time the input xml specifies
 * that an instance of that plugged-in class is to be created.
 * <p>
 * This is an abstract class rather than an interface in order to make
 * it possible to enhance this class in future without breaking binary
 * compatibility; it is possible to add methods to an abstract class, but
 * not to an interface. 
 *
 * @since 1.6
 */

public abstract class RuleLoader {
    
    /**
     * Configures the digester with custom rules for some plugged-in
     * class.
     * <p>
     * This method is invoked when the start of an xml tag is encountered
     * which maps to a PluginCreateRule. Any rules added here are removed
     * from the digester when the end of that xml tag is encountered.
     */
    public abstract void addRules(Digester d, String path) throws PluginException;
}