    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}