Source Code Cross Referenced for GenericCache.java in  » Library » jakarta-oro-2.0.8 » org » apache » oro » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » jakarta oro 2.0.8 » org.apache.oro.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: GenericCache.java,v 1.8 2003/11/07 20:16:25 dfs Exp $
003:         *
004:         * ====================================================================
005:         * The Apache Software License, Version 1.1
006:         *
007:         * Copyright (c) 2000 The Apache Software Foundation.  All rights
008:         * reserved.
009:         *
010:         * Redistribution and use in source and binary forms, with or without
011:         * modification, are permitted provided that the following conditions
012:         * are met:
013:         *
014:         * 1. Redistributions of source code must retain the above copyright
015:         *    notice, this list of conditions and the following disclaimer.
016:         *
017:         * 2. Redistributions in binary form must reproduce the above copyright
018:         *    notice, this list of conditions and the following disclaimer in
019:         *    the documentation and/or other materials provided with the
020:         *    distribution.
021:         *
022:         * 3. The end-user documentation included with the redistribution,
023:         *    if any, must include the following acknowledgment:
024:         *       "This product includes software developed by the
025:         *        Apache Software Foundation (http://www.apache.org/)."
026:         *    Alternately, this acknowledgment may appear in the software itself,
027:         *    if and wherever such third-party acknowledgments normally appear.
028:         *
029:         * 4. The names "Apache" and "Apache Software Foundation", "Jakarta-Oro" 
030:         *    must not be used to endorse or promote products derived from this
031:         *    software without prior written permission. For written
032:         *    permission, please contact apache@apache.org.
033:         *
034:         * 5. Products derived from this software may not be called "Apache" 
035:         *    or "Jakarta-Oro", nor may "Apache" or "Jakarta-Oro" appear in their 
036:         *    name, without prior written permission of the Apache Software Foundation.
037:         *
038:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
039:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
040:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
041:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
042:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
043:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
044:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
045:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
046:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
047:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
048:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
049:         * SUCH DAMAGE.
050:         * ====================================================================
051:         *
052:         * This software consists of voluntary contributions made by many
053:         * individuals on behalf of the Apache Software Foundation.  For more
054:         * information on the Apache Software Foundation, please see
055:         * <http://www.apache.org/>.
056:         */
057:
058:        package org.apache.oro.util;
059:
060:        import java.util.*;
061:
062:        /**
063:         * This is the base class for all cache implementations provided in the
064:         * org.apache.oro.util package.  To derive a subclass from GenericCache
065:         * only the ... methods
066:         * need be overridden.
067:         * Although 4 subclasses of GenericCache are provided with this
068:         * package, users may not derive subclasses from this class.
069:         * Rather, users should create their own implmentations of the
070:         * {@link Cache} interface.
071:         *
072:         * @version @version@
073:         * @since 1.0
074:         * @see Cache
075:         * @see CacheLRU
076:         * @see CacheFIFO
077:         * @see CacheFIFO2
078:         * @see CacheRandom
079:         */
080:        public abstract class GenericCache implements  Cache,
081:                java.io.Serializable {
082:            /**
083:             * The default capacity to be used by the GenericCache subclasses
084:             * provided with this package.  Its value is 20.
085:             */
086:            public static final int DEFAULT_CAPACITY = 20;
087:
088:            int _numEntries;
089:            GenericCacheEntry[] _cache;
090:            HashMap _table;
091:
092:            /**
093:             * The primary constructor for GenericCache.  It has default
094:             * access so it will only be used within the package.  It initializes
095:             * _table to a Hashtable of capacity equal to the capacity argument,
096:             * _cache to an array of size equal to the capacity argument, and
097:             * _numEntries to 0.
098:             * <p>
099:             * @param capacity The maximum capacity of the cache.
100:             */
101:            GenericCache(int capacity) {
102:                _numEntries = 0;
103:                _table = new HashMap(capacity);
104:                _cache = new GenericCacheEntry[capacity];
105:
106:                while (--capacity >= 0)
107:                    _cache[capacity] = new GenericCacheEntry(capacity);
108:            }
109:
110:            public abstract void addElement(Object key, Object value);
111:
112:            public synchronized Object getElement(Object key) {
113:                Object obj;
114:
115:                obj = _table.get(key);
116:
117:                if (obj != null)
118:                    return ((GenericCacheEntry) obj)._value;
119:
120:                return null;
121:            }
122:
123:            public final Iterator keys() {
124:                return _table.keySet().iterator();
125:            }
126:
127:            /**
128:             * Returns the number of elements in the cache, not to be confused with
129:             * the {@link #capacity()} which returns the number
130:             * of elements that can be held in the cache at one time.
131:             * <p>
132:             * @return  The current size of the cache (i.e., the number of elements
133:             *          currently cached).
134:             */
135:            public final int size() {
136:                return _numEntries;
137:            }
138:
139:            /**
140:             * Returns the maximum number of elements that can be cached at one time.
141:             * <p>
142:             * @return The maximum number of elements that can be cached at one time.
143:             */
144:            public final int capacity() {
145:                return _cache.length;
146:            }
147:
148:            public final boolean isFull() {
149:                return (_numEntries >= _cache.length);
150:            }
151:        }
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