1  /*
     2   * Licensed to the Apache Software Foundation (ASF) under one or more
     3   *  contributor license agreements.  The ASF licenses this file to You
     4   * under the Apache License, Version 2.0 (the "License"); you may not
     5   * 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.  For additional information regarding
    15   * copyright in this work, please see the NOTICE file in the top level
    16   * directory of this distribution.
    17   */
    18  
    19  package org.apache.roller.weblogger.pojos;
    20  
    21  import java.util.Comparator;
    22  import java.io.Serializable;
    23  
    24  /**
    25   * @author Markus Fuchs
    26   */
    27  public class TagStatCountComparator implements Comparator, Serializable {
    28  
    29      private static final long serialVersionUID = 1155112837815739929L;
    30  
    31      private static TagStatCountComparator instance = new TagStatCountComparator();
    32      
    33      /**
    34       * 
    35       */
    36      public TagStatCountComparator() {
    37  
    38      }
    39  
    40      /** 
    41       * Compares two <em>TagStat</em> instances according to their count values.
    42       * 
    43       * @throws ClassCastException if arguments are not instances of <em>TagStat</em>
    44       * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
    45       */
    46      public int compare(Object obj1, Object obj2) throws ClassCastException {
                 /* 
    P/P           *  Method: int compare(Object, Object)
                  * 
                  *  Preconditions:
                  *    obj1 != null
                  *    init'ed(obj1.count)
                  *    obj2 != null
                  *    init'ed(obj2.count)
                  *    (soft) obj1.name != null
                  *    (soft) init'ed(obj2.name)
                  * 
                  *  Postconditions:
                  *    init'ed(return_value)
                  */
    47          TagStat st1 = (TagStat) obj1;
    48          TagStat st2 = (TagStat) obj2;
    49          int compVal = st1.getCount() < st2.getCount() ? -1 :
    50                  (st1.getCount() == st2.getCount() ? 0 : 1);
    51          
    52          if (compVal == 0) {
    53              compVal = st1.getName().compareTo(st2.getName());
    54          }
    55          return compVal;
    56      }
    57  
    58      public static TagStatCountComparator getInstance() {
                 /* 
    P/P           *  Method: TagStatCountComparator getInstance()
                  * 
                  *  Preconditions:
                  *    init'ed(instance)
                  * 
                  *  Postconditions:
                  *    return_value == instance
                  *    init'ed(return_value)
                  */
    59          return instance;
    60      }
    61  }