Source Code Cross Referenced for SoftValueMap.java in  » Database-ORM » JPOX » org » jpox » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » JPOX » org.jpox.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /**********************************************************************
02:        Copyright (c) 2002 Mike Martin (TJDO) and others. All rights reserved.
03:        Licensed under the Apache License, Version 2.0 (the "License");
04:        you may not use this file except in compliance with the License.
05:        You may obtain a copy of the License at
06:
07:            http://www.apache.org/licenses/LICENSE-2.0
08:
09:        Unless required by applicable law or agreed to in writing, software
10:        distributed under the License is distributed on an "AS IS" BASIS,
11:        WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12:        See the License for the specific language governing permissions and
13:        limitations under the License.
14:         
15:
16:        Contributors:
17:        2002 Kelly Grizzle (TJDO)
18:        2003 Andy Jefferson - coding standards
19:            ...
20:         **********************************************************************/package org.jpox.util;
21:
22:        import java.lang.ref.ReferenceQueue;
23:        import java.lang.ref.SoftReference;
24:        import java.util.Map;
25:
26:        /**
27:         * A <code>java.util.Map</code> implementation with soft values.
28:         *
29:         * <P> The values are stored as soft references. If map entry value object 
30:         * is not actively being used, i.e. no other object has a strong reference 
31:         * to it, it may become garbage collected at the discretion of the garbage
32:         * collector (typically if the VM is low on memory). If this happens, the 
33:         * entry in the <code>SoftValueMap</code> corresponding to the value object
34:         * will also be removed.
35:         *
36:         * @see SoftReference
37:         * @version $Revision: 1.2 $
38:         */
39:        public class SoftValueMap extends ReferenceValueMap {
40:            /**
41:             * Default Constructor
42:             **/
43:            public SoftValueMap() {
44:                super ();
45:            }
46:
47:            /**
48:             * Constructor taking the initial capacity.
49:             * @param initialCapacity The Initial capacity of the collection
50:             **/
51:            public SoftValueMap(int initialCapacity) {
52:                super (initialCapacity);
53:            }
54:
55:            /**
56:             * Constructor taking the initial capacity and load factor.
57:             * @param initialCapacity The Initial capacity of the collection
58:             * @param loadFactor The Load Factor of the collection
59:             **/
60:            public SoftValueMap(int initialCapacity, float loadFactor) {
61:                super (initialCapacity, loadFactor);
62:            }
63:
64:            /**
65:             * Constructor taking a Map for definition.
66:             * @param m The Map 
67:             **/
68:            public SoftValueMap(Map m) {
69:                super (m);
70:            }
71:
72:            /**
73:             * Representation of a soft value reference.
74:             **/
75:            private static class SoftValueReference extends SoftReference
76:                    implements  ReferenceValueMap.ValueReference {
77:                private final Object key;
78:
79:                SoftValueReference(Object key, Object value, ReferenceQueue q) {
80:                    super (value, q);
81:                    this .key = key;
82:                }
83:
84:                public Object getKey() {
85:                    return key;
86:                }
87:            }
88:
89:            protected ReferenceValueMap.ValueReference newValueReference(
90:                    Object key, Object value, ReferenceQueue queue) {
91:                return new SoftValueReference(key, value, queue);
92:            }
93:        }
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