001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements.  See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache License, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the License for the specific language governing permissions and
015     * limitations under the License.
016     */
017    
018    package org.apache.commons.configuration;
019    
020    import java.util.Iterator;
021    
022    /**
023     * Strict comparator for configurations.
024     *
025     * @since 1.0
026     *
027     * @author <a href="mailto:herve.quiroz@esil.univ-mrs.fr">Herve Quiroz</a>
028     * @author <a href="mailto:shapira@mpi.com">Yoav Shapira</a>
029     * @version $Revision: 439648 $, $Date: 2006-09-02 22:42:10 +0200 (Sa, 02. Sep 2006) $
030     */
031    public class StrictConfigurationComparator implements ConfigurationComparator
032    {
033        /**
034         * Create a new strict comparator.
035         */
036        public StrictConfigurationComparator()
037        {
038        }
039    
040        /**
041         * Compare two configuration objects.
042         *
043         * @param a the first configuration
044         * @param b the second configuration
045         * @return true if keys from a are found in b and keys from b are
046         *         found in a and for each key in a, the corresponding value
047         *         is the sale in for the same key in b
048         */
049        public boolean compare(Configuration a, Configuration b)
050        {
051            if (a == null && b == null)
052            {
053                return true;
054            }
055            else if (a == null || b == null)
056            {
057                return false;
058            }
059    
060            for (Iterator keys = a.getKeys(); keys.hasNext();)
061            {
062                String key = (String) keys.next();
063                Object value = a.getProperty(key);
064                if (!value.equals(b.getProperty(key)))
065                {
066                    return false;
067                }
068            }
069    
070            for (Iterator keys = b.getKeys(); keys.hasNext();)
071            {
072                String key = (String) keys.next();
073                Object value = b.getProperty(key);
074                if (!value.equals(a.getProperty(key)))
075                {
076                    return false;
077                }
078            }
079    
080            return true;
081        }
082    }