    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 */
    027public class StrictConfigurationComparator implements ConfigurationComparator {
    028    /**
    029     * Create a new strict comparator.
    030     */
    031    public StrictConfigurationComparator() {
    032    }
    033
    034    /**
    035     * Compare two configuration objects.
    036     *
    037     * @param a the first configuration
    038     * @param b the second configuration
    039     * @return true if keys from a are found in b and keys from b are found in a and for each key in a, the corresponding
    040     *         value is the sale in for the same key in b
    041     */
    042    @Override
    043    public boolean compare(final Configuration a, final Configuration b) {
    044        if (a == null && b == null) {
    045            return true;
    046        }
    047        if (a == null || b == null) {
    048            return false;
    049        }
    050
    051        for (final Iterator<String> keys = a.getKeys(); keys.hasNext();) {
    052            final String key = keys.next();
    053            final Object value = a.getProperty(key);
    054            if (!value.equals(b.getProperty(key))) {
    055                return false;
    056            }
    057        }
    058
    059        for (final Iterator<String> keys = b.getKeys(); keys.hasNext();) {
    060            final String key = keys.next();
    061            final Object value = b.getProperty(key);
    062            if (!value.equals(a.getProperty(key))) {
    063                return false;
    064            }
    065        }
    066
    067        return true;
    068    }
    069}