    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    }