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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  }