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comparison src/classes/java/lang/ref/Reference.java @ 0:61d41facf527

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initial v8 import (history reset)
author Peter Mehlitz <Peter.C.Mehlitz@nasa.gov>
date Fri, 23 Jan 2015 10:14:01 -0800
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1 /*
2 * Copyright (C) 2014, United States Government, as represented by the
3 * Administrator of the National Aeronautics and Space Administration.
4 * All rights reserved.
5 *
6 * The Java Pathfinder core (jpf-core) platform is licensed under the
7 * Apache License, Version 2.0 (the "License"); you may not use this file except
8 * in compliance with the License. You may obtain a copy of the License at
9 *
10 * http://www.apache.org/licenses/LICENSE-2.0.
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18 package java.lang.ref;
19
20 /**
21 * MJI model class for java.lang.ref.Reference library abstraction
22 * we model this so that we can rely on our WeakRefence implementation
23 */
24 public abstract class Reference<T> {
25
26 /**
27 * the object we reference
28 * NOTE: this has to be the *first* field, or we break WeakReference handling in
29 * the garbage collection!!
30 */
31 T ref;
32
33 /** the optional queue for us */
34 ReferenceQueue<? super T> queue;
35
36 /** link to enqueue w/o additional memory requirements */
37 Reference<T> next;
38
39 Reference (T r) {
40 ref = r;
41 }
42
43 Reference (T r, ReferenceQueue<? super T> q) {
44 ref = r;
45 queue = q;
46 }
47
48 /** is the referenced object enqueued */
49 public boolean isEnqueued () {
50 // <2do>
51 return false;
52 }
53
54 /** clear, but do not enqueue the referenced object */
55 public void clear () {
56 ref = null;
57 }
58
59 /** add the referenced object to its queue */
60 public void enqueue () {
61 }
62
63 /** return the referenced object */
64 public T get () {
65 return ref;
66 }
67 }