/* 
    P/P   *  Method: com.dmdirc.util.EquatableWeakReference__static_init
          */
     1  /*
     2   * Copyright (c) 2006-2009 Chris Smith, Shane Mc Cormack, Gregory Holmes
     3   *
     4   * Permission is hereby granted, free of charge, to any person obtaining a copy
     5   * of this software and associated documentation files (the "Software"), to deal
     6   * in the Software without restriction, including without limitation the rights
     7   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     8   * copies of the Software, and to permit persons to whom the Software is
     9   * furnished to do so, subject to the following conditions:
    10   *
    11   * The above copyright notice and this permission notice shall be included in
    12   * all copies or substantial portions of the Software.
    13   *
    14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    20   * SOFTWARE.
    21   */
    22  
    23  package com.dmdirc.util;
    24  
    25  import java.lang.ref.Reference;
    26  import java.lang.ref.WeakReference;
    27  
    28  /**
    29   * An extension of WeakReference that implements a sane equals and hashcode
    30   * method.
    31   * 
    32   * @param <T> The type of object that this reference contains
    33   * @author chris
    34   */
    35  public class EquatableWeakReference<T> extends WeakReference<T> {
    36      
    37      /**
    38       * Creates a new instance of EquatableWeakReference.
    39       * 
    40       * @param referent The object that this weak reference should reference.
    41       */
    42      public EquatableWeakReference(T referent) {
                 /* 
    P/P           *  Method: void com.dmdirc.util.EquatableWeakReference(Object)
                  */
    43          super(referent);
    44      }
    45  
    46      /** {@inheritDoc} */
    47      @Override
    48      public boolean equals(Object obj) {
                 /* 
    P/P           *  Method: bool equals(Object)
                  * 
                  *  Presumptions:
                  *    com.dmdirc.util.EquatableWeakReference:get(...)@50 != null
                  *    com.dmdirc.util.EquatableWeakReference:get(...)@52 != null
                  * 
                  *  Postconditions:
                  *    init'ed(return_value)
                  */
    49          if (obj instanceof Reference) {
    50              return get().equals(((Reference) obj).get());
    51          } else {
    52              return get().equals(obj);
    53          }
    54      }
    55  
    56      /** {@inheritDoc} */
    57      @Override
    58      public int hashCode() {
                 /* 
    P/P           *  Method: int hashCode()
                  * 
                  *  Presumptions:
                  *    com.dmdirc.util.EquatableWeakReference:get(...)@59 != null
                  * 
                  *  Postconditions:
                  *    init'ed(return_value)
                  */
    59          return get().hashCode();
    60      }
    61      
    62  }