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
018 package org.apache.commons.configuration;
019
020 import 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 1210177 2011-12-04 18:58:19Z oheger $
030 */
031 public 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 public boolean compare(Configuration a, 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 (Iterator<String> keys = a.getKeys(); keys.hasNext();)
061 {
062 String key = keys.next();
063 Object value = a.getProperty(key);
064 if (!value.equals(b.getProperty(key)))
065 {
066 return false;
067 }
068 }
069
070 for (Iterator<String> keys = b.getKeys(); keys.hasNext();)
071 {
072 String key = keys.next();
073 Object value = b.getProperty(key);
074 if (!value.equals(a.getProperty(key)))
075 {
076 return false;
077 }
078 }
079
080 return true;
081 }
082 }