01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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: * @author Dmitry B. Yershov
19: * @version $Revision: 1.1.2.1.4.3 $
20: */package java.lang.ref;
21:
22: /**
23: * @com.intel.drl.spec_ref
24: */
25: public abstract class Reference<T> {
26:
27: private volatile T referent;
28:
29: ReferenceQueue<? super T> queue;
30:
31: Reference next;
32:
33: Reference(T referent) {
34: this .referent = referent;
35: }
36:
37: Reference(T referent, ReferenceQueue<? super T> q) {
38: this .queue = q;
39: this .referent = referent;
40: }
41:
42: /**
43: * @com.intel.drl.spec_ref
44: */
45: public void clear() {
46: referent = null;
47: }
48:
49: /**
50: * @com.intel.drl.spec_ref
51: */
52: public boolean enqueue() {
53: if (next == null && queue != null) {
54: queue.enqueue(this );
55: queue = null;
56: return true;
57: }
58: return false;
59: }
60:
61: /**
62: * @com.intel.drl.spec_ref
63: */
64: public T get() {
65: return referent;
66: }
67:
68: /**
69: * @com.intel.drl.spec_ref
70: */
71: public boolean isEnqueued() {
72: return (next != null);
73: }
74:
75: }
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