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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.commons.configuration;
19  
20  import java.util.Iterator;
21  
22  /***
23   * Strict comparator for configurations.
24   *
25   * @since 1.0
26   *
27   * @author <a href="mailto:herve.quiroz@esil.univ-mrs.fr">Herve Quiroz</a>
28   * @author <a href="mailto:shapira@mpi.com">Yoav Shapira</a>
29   * @version $Revision: 439648 $, $Date: 2006-09-02 22:42:10 +0200 (Sa, 02 Sep 2006) $
30   */
31  public class StrictConfigurationComparator implements ConfigurationComparator
32  {
33      /***
34       * Create a new strict comparator.
35       */
36      public StrictConfigurationComparator()
37      {
38      }
39  
40      /***
41       * Compare two configuration objects.
42       *
43       * @param a the first configuration
44       * @param b the second configuration
45       * @return true if keys from a are found in b and keys from b are
46       *         found in a and for each key in a, the corresponding value
47       *         is the sale in for the same key in b
48       */
49      public boolean compare(Configuration a, Configuration b)
50      {
51          if (a == null && b == null)
52          {
53              return true;
54          }
55          else if (a == null || b == null)
56          {
57              return false;
58          }
59  
60          for (Iterator keys = a.getKeys(); keys.hasNext();)
61          {
62              String key = (String) keys.next();
63              Object value = a.getProperty(key);
64              if (!value.equals(b.getProperty(key)))
65              {
66                  return false;
67              }
68          }
69  
70          for (Iterator keys = b.getKeys(); keys.hasNext();)
71          {
72              String key = (String) keys.next();
73              Object value = b.getProperty(key);
74              if (!value.equals(a.getProperty(key)))
75              {
76                  return false;
77              }
78          }
79  
80          return true;
81      }
82  }