    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 */
    030public class StrictConfigurationComparator implements ConfigurationComparator
    031{
    032    /**
    033     * Create a new strict comparator.
    034     */
    035    public StrictConfigurationComparator()
    036    {
    037    }
    038
    039    /**
    040     * Compare two configuration objects.
    041     *
    042     * @param a the first configuration
    043     * @param b the second configuration
    044     * @return true if keys from a are found in b and keys from b are
    045     *         found in a and for each key in a, the corresponding value
    046     *         is the sale in for the same key in b
    047     */
    048    @Override
    049    public boolean compare(final Configuration a, final 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 (final Iterator<String> keys = a.getKeys(); keys.hasNext();)
    061        {
    062            final String key = keys.next();
    063            final Object value = a.getProperty(key);
    064            if (!value.equals(b.getProperty(key)))
    065            {
    066                return false;
    067            }
    068        }
    069
    070        for (final Iterator<String> keys = b.getKeys(); keys.hasNext();)
    071        {
    072            final String key = keys.next();
    073            final Object value = b.getProperty(key);
    074            if (!value.equals(a.getProperty(key)))
    075            {
    076                return false;
    077            }
    078        }
    079
    080        return true;
    081    }
    082}