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 $Revision: 439648 $, $Date: 2006-09-02 22:42:10 +0200 (Sa, 02. Sep 2006) $ 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 keys = a.getKeys(); keys.hasNext();) 061 { 062 String key = (String) 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 keys = b.getKeys(); keys.hasNext();) 071 { 072 String key = (String) 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 }