Source Code Cross Referenced for CachePointer.java in  » Content-Management-System » harmonise » org » openharmonise » commons » cache » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » harmonise » org.openharmonise.commons.cache 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * The contents of this file are subject to the 
003:         * Mozilla Public License Version 1.1 (the "License"); 
004:         * you may not use this file except in compliance with the License. 
005:         * You may obtain a copy of the License at http://www.mozilla.org/MPL/
006:         *
007:         * Software distributed under the License is distributed on an "AS IS"
008:         * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. 
009:         * See the License for the specific language governing rights and 
010:         * limitations under the License.
011:         *
012:         * The Initial Developer of the Original Code is Simulacra Media Ltd.
013:         * Portions created by Simulacra Media Ltd are Copyright (C) Simulacra Media Ltd, 2004.
014:         *
015:         * All Rights Reserved.
016:         *
017:         * Contributor(s):
018:         */
019:        package org.openharmonise.commons.cache;
020:
021:        /**
022:         * Class to provide a soft link to an object in a cache, i.e. an link to
023:         * an object which may or may not actually reside in the cache but can
024:         * be accessed through the cache. Useful for pointing to objects which 
025:         * logically don't change but their object representations do. 
026:         * 
027:         * @author Michael Bell
028:         * @version $Revision: 1.1 $
029:         *
030:         */
031:        public class CachePointer {
032:
033:            /**
034:             * Cache key of object.
035:             */
036:            protected Object m_cache_key;
037:
038:            /**
039:             * Cache which will contain the object.
040:             */
041:            protected AbstractCache m_cache;
042:
043:            /**
044:             * Constructs a cache pointer which does not reference any object.
045:             */
046:            public CachePointer() {
047:
048:            }
049:
050:            /**
051:             * Constructs a cache pointer which references the object found in
052:             * cache <code>cache</code> with cache key <code>key</code>.
053:             * 
054:             * @param key the cache key
055:             * @param cache the cache
056:             */
057:            public CachePointer(Object key, AbstractCache cache) {
058:                m_cache_key = key;
059:                m_cache = cache;
060:            }
061:
062:            /**
063:             * Returns the cache the pointer is referencing.
064:             * 
065:             * @return the cache
066:             */
067:            public AbstractCache getCache() {
068:                return m_cache;
069:            }
070:
071:            /**
072:             * Returns the cache key for the object the pointer is referencing.
073:             * 
074:             * @return the cache key
075:             */
076:            public Object getKey() {
077:                return m_cache_key;
078:            }
079:
080:            /**
081:             * Set the cache the pointer will reference.
082:             * 
083:             * @param cache cache to be referenced
084:             */
085:            public void setCache(AbstractCache cache) {
086:                this .m_cache = cache;
087:            }
088:
089:            /**
090:             * Sets the cache key for the object the pointer will reference.
091:             * 
092:             * @param object the cache key corresponding to the cached object
093:             */
094:            public void setKey(Object object) {
095:                m_cache_key = object;
096:            }
097:
098:            /**
099:             * Returns the object this pointer references.
100:             * 
101:             * @return the cached object this cache pointer references
102:             * @throws CacheException
103:             */
104:            public Object getObject() throws CacheException {
105:                return m_cache.getObject(m_cache_key);
106:            }
107:
108:            /* (non-Javadoc)
109:             * @see java.lang.Object#equals(java.lang.Object)
110:             */
111:            public boolean equals(Object obj) {
112:                boolean bEq = false;
113:
114:                if (obj instanceof  CachePointer) {
115:                    CachePointer ptr = (CachePointer) obj;
116:
117:                    if (this  == ptr) {
118:                        bEq = true;
119:                    } else if (ptr.getCache().equals(m_cache) == true
120:                            && ptr.getKey().equals(m_cache_key) == true) {
121:                        bEq = true;
122:                    }
123:                }
124:                return bEq;
125:            }
126:
127:        }
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