1 package sun.awt;
   2 
   3 import java.lang.ref.Reference;
   4 import java.lang.ref.ReferenceQueue;
   5 import java.lang.ref.WeakReference;
   6 import java.util.*;
   7 
   8 // A weak key reference hash map that uses System.identityHashCode() and "=="
   9 // instead of hashCode() and equals(Object)
  10 class WeakIdentityHashMap<K, V> implements Map<K, V> {
  11     private final Map<WeakKey<K>, V> map;
  12     private final transient ReferenceQueue<K> queue = new ReferenceQueue<K>();
  13 
  14     /**
  15      * Constructs a new, empty identity hash map with a default initial
  16      * size (16).
  17      */
  18     public WeakIdentityHashMap() {
  19         map = new HashMap<>(16);
  20     }

   1 /*
   2  * Copyright (c) 2015, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package sun.awt;
  27 
  28 import java.lang.ref.Reference;
  29 import java.lang.ref.ReferenceQueue;
  30 import java.lang.ref.WeakReference;
  31 import java.util.*;
  32 
  33 // A weak key reference hash map that uses System.identityHashCode() and "=="
  34 // instead of hashCode() and equals(Object)
  35 class WeakIdentityHashMap<K, V> implements Map<K, V> {
  36     private final Map<WeakKey<K>, V> map;
  37     private final transient ReferenceQueue<K> queue = new ReferenceQueue<K>();
  38 
  39     /**
  40      * Constructs a new, empty identity hash map with a default initial
  41      * size (16).
  42      */
  43     public WeakIdentityHashMap() {
  44         map = new HashMap<>(16);
  45     }