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    1   /*
    2    * Copyright 2001-2004 The Apache Software Foundation.
    3    *
    4    * Licensed under the Apache License, Version 2.0 (the "License")
    5    * you may not use this file except in compliance with the License.
    6    * You may obtain a copy of the License at
    7    *
    8    *     http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16
    17  package org.apache.commons.configuration;
    18
    19  import java.util.Iterator;
    20
    21  /***
    22   * Strict comparator for configurations.
    23   *
    24   * @since 1.0
    25   *
    26   * @author <a href="mailto:herve.quiroz@esil.univ-mrs.fr">Herve Quiroz</a>
    27   * @author <a href="mailto:shapira@mpi.com">Yoav Shapira</a>
    28   * @version $Revision: 1.3 $, $Date: 2004/06/22 09:56:38 $
    29   */
    30  public class StrictConfigurationComparator implements ConfigurationComparator
    31  {
    32      /***
    33       * Create a new strict comparator.
    34       */
    35      public StrictConfigurationComparator()
    36      {
    37      }
    38
    39      /***
    40       * Compare two configuration objects.
    41       *
    42       * @param a the first configuration
    43       * @param b the second configuration
    44       * @return true if keys from a are found in b and keys from b are
    45       *         found in a and for each key in a, the corresponding value
    46       *         is the sale in for the same key in b
    47       */
    48      public boolean compare(Configuration a, Configuration b)
    49      {
    50          if (a == null && b == null)
    51          {
    52              return true;
    53          }
    54          else if (a == null || b == null)
    55          {
    56              return false;
    57          }
    58
    59          for (Iterator keys = a.getKeys(); keys.hasNext();)
    60          {
    61              String key = (String) keys.next();
    62              Object value = a.getProperty(key);
    63              if (!value.equals(b.getProperty(key)))
    64              {
    65                  return false;
    66              }
    67          }
    68
    69          for (Iterator keys = b.getKeys(); keys.hasNext();)
    70          {
    71              String key = (String) keys.next();
    72              Object value = b.getProperty(key);
    73              if (!value.equals(a.getProperty(key)))
    74              {
    75                  return false;
    76              }
    77          }
    78
    79          return true;
    80      }
    81  }