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 */
028public class StrictConfigurationComparator implements ConfigurationComparator
029{
030    /**
031     * Create a new strict comparator.
032     */
033    public StrictConfigurationComparator()
034    {
035    }
036
037    /**
038     * Compare two configuration objects.
039     *
040     * @param a the first configuration
041     * @param b the second configuration
042     * @return true if keys from a are found in b and keys from b are
043     *         found in a and for each key in a, the corresponding value
044     *         is the sale in for the same key in b
045     */
046    @Override
047    public boolean compare(final Configuration a, final Configuration b)
048    {
049        if (a == null && b == null)
050        {
051            return true;
052        }
053        else if (a == null || b == null)
054        {
055            return false;
056        }
057
058        for (final Iterator<String> keys = a.getKeys(); keys.hasNext();)
059        {
060            final String key = keys.next();
061            final Object value = a.getProperty(key);
062            if (!value.equals(b.getProperty(key)))
063            {
064                return false;
065            }
066        }
067
068        for (final Iterator<String> keys = b.getKeys(); keys.hasNext();)
069        {
070            final String key = keys.next();
071            final Object value = b.getProperty(key);
072            if (!value.equals(a.getProperty(key)))
073            {
074                return false;
075            }
076        }
077
078        return true;
079    }
080}