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
018package org.apache.commons.configuration2;
019
020import 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 $Id: StrictConfigurationComparator.java 1624601 2014-09-12 18:04:36Z oheger $
030 */
031public 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    @Override
050    public boolean compare(Configuration a, Configuration b)
051    {
052        if (a == null && b == null)
053        {
054            return true;
055        }
056        else if (a == null || b == null)
057        {
058            return false;
059        }
060
061        for (Iterator<String> keys = a.getKeys(); keys.hasNext();)
062        {
063            String key = keys.next();
064            Object value = a.getProperty(key);
065            if (!value.equals(b.getProperty(key)))
066            {
067                return false;
068            }
069        }
070
071        for (Iterator<String> keys = b.getKeys(); keys.hasNext();)
072        {
073            String key = keys.next();
074            Object value = b.getProperty(key);
075            if (!value.equals(a.getProperty(key)))
076            {
077                return false;
078            }
079        }
080
081        return true;
082    }
083}