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/*
 * 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.tomcat.util.digester.Digester;
import org.apache.tomcat.util.digester.RuleSet;

/**
 * RuleSet for processing the contents of a Engine definition element. This RuleSet does
 * NOT include any rules for nested Host elements, which should be added via instances of HostRuleSet.
 *
 * @author Craig R. McClanahan
 */
public class EngineRuleSet implements RuleSet {

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

    /**
     * The matching pattern prefix to use for recognizing our elements.
     */
    protected final String prefix;


    // ------------------------------------------------------------ Constructor

    /**
     * Construct an instance of this RuleSet with the default matching pattern prefix.
     */
    public EngineRuleSet() {
        this("");
    }


    /**
     * Construct an instance of this RuleSet with the specified matching pattern prefix.
     *
     * @param prefix Prefix for matching pattern rules (including the trailing slash character)
     */
    public EngineRuleSet(String prefix) {
        this.prefix = prefix;
    }


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

    /**
     * 
     * Add the set of Rule instances defined in this RuleSet to the specified Digester instance,
     * associating them with our namespace URI (if any). This method should only be called by a Digester instance.
     * 
     *
     * @param digester Digester instance to which the new Rule instances should be added.
     */
    @Override
    public void addRuleInstances(Digester digester) {

        digester.addObjectCreate(prefix + "Engine", "org.apache.catalina.core.StandardEngine", "className");
        digester.addSetProperties(prefix + "Engine");
        digester.addRule(prefix + "Engine",
                new LifecycleListenerRule("org.apache.catalina.startup.EngineConfig", "engineConfigClass"));
        digester.addSetNext(prefix + "Engine", "setContainer", "org.apache.catalina.Engine");

        // Cluster configuration start
        digester.addObjectCreate(prefix + "Engine/Cluster", null, // MUST be specified in the element
                "className");
        digester.addSetProperties(prefix + "Engine/Cluster");
        digester.addSetNext(prefix + "Engine/Cluster", "setCluster", "org.apache.catalina.Cluster");
        // Cluster configuration end

        digester.addObjectCreate(prefix + "Engine/Listener", null, // MUST be specified in the element
                "className");
        digester.addSetProperties(prefix + "Engine/Listener");
        digester.addSetNext(prefix + "Engine/Listener", "addLifecycleListener",
                "org.apache.catalina.LifecycleListener");


        digester.addRuleSet(new RealmRuleSet(prefix + "Engine/"));

        digester.addObjectCreate(prefix + "Engine/Valve", null, // MUST be specified in the element
                "className");
        digester.addSetProperties(prefix + "Engine/Valve");
        digester.addCallMethod(prefix + "Engine/Valve/init-param", "addInitParam", 2);
        digester.addCallParam(prefix + "Engine/Valve/init-param/param-name", 0);
        digester.addCallParam(prefix + "Engine/Valve/init-param/param-value", 1);
        digester.addSetNext(prefix + "Engine/Valve", "addValve", "org.apache.catalina.Valve");
    }
}