/*
 * 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 Realm definition
element.  This RuleSet supports Realms such as the
CombinedRealm that used nested Realms.
/**
 * <p><strong>RuleSet</strong> for processing the contents of a Realm definition
 * element.  This <code>RuleSet</code> supports Realms such as the
 * <code>CombinedRealm</code> that used nested Realms.</p>
 */
public class RealmRuleSet implements RuleSet {

    private static final int MAX_NESTED_REALM_LEVELS = Integer.getInteger(
            "org.apache.catalina.startup.RealmRuleSet.MAX_NESTED_REALM_LEVELS",
            3).intValue();


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

    
The matching pattern prefix to use for recognizing our elements.
/**
     * 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.
/**
     * Construct an instance of this <code>RuleSet</code> with the default
     * matching pattern prefix.
     */
    public RealmRuleSet() {
        this("");
    }


    
Construct an instance of this RuleSet with the specified
matching pattern prefix.
Params:
prefix – Prefix for matching pattern rules (including the
 trailing slash character)/**
     * Construct an instance of this <code>RuleSet</code> with the specified
     * matching pattern prefix.
     *
     * @param prefix Prefix for matching pattern rules (including the
     *  trailing slash character)
     */
    public RealmRuleSet(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.
Params:
digester – Digester instance to which the new Rule instances
 should be added./**
     * <p>Add the set of Rule instances defined in this RuleSet to the
     * specified <code>Digester</code> instance, associating them with
     * our namespace URI (if any).  This method should only be called
     * by a Digester instance.</p>
     *
     * @param digester Digester instance to which the new Rule instances
     *  should be added.
     */
    @Override
    public void addRuleInstances(Digester digester) {
        StringBuilder pattern = new StringBuilder(prefix);
        for (int i = 0; i < MAX_NESTED_REALM_LEVELS; i++) {
            if (i > 0) {
                pattern.append('/');
            }
            pattern.append("Realm");
            addRuleInstances(digester, pattern.toString(), i == 0 ? "setRealm" : "addRealm");
        }
    }

    private void addRuleInstances(Digester digester, String pattern, String methodName) {
        digester.addObjectCreate(pattern, null /* MUST be specified in the element */,
                "className");
        digester.addSetProperties(pattern);
        digester.addSetNext(pattern, methodName, "org.apache.catalina.Realm");
        digester.addRuleSet(new CredentialHandlerRuleSet(pattern + "/"));
    }
}