/* | |
* Copyright 2005-2008 Jeremy Haile, Les Hazlewood | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
package org.jsecurity.cache; | |
import java.util.*; | |
/** | |
* An implementation of the JSecurity {@link Cache} interface that uses a | |
* {@link Hashtable} to store cached objects. This implementation is only suitable for | |
* development/testing use. A more robust caching solution should be used for production | |
* systems such as the {@link org.jsecurity.cache.ehcache.EhCacheManager} | |
* | |
* @since 0.2 | |
* @author Jeremy Haile | |
* @author Les Hazlewood | |
*/ | |
@SuppressWarnings( "unchecked" ) | |
public class HashtableCache implements Cache { | |
/** | |
* The underlying hashtable. | |
*/ | |
private final Map hashtable = new Hashtable(); | |
/** | |
* The name of this cache. | |
*/ | |
private final String name; | |
/** | |
* Creates a new cache with the given name. | |
* | |
* @param name the name of this cache. | |
*/ | |
public HashtableCache( String name) { | |
this.name = name; | |
} | |
public Object read( Object key ) throws CacheException { | |
return hashtable.get( key ); | |
} | |
public Object get( Object key ) throws CacheException { | |
return hashtable.get( key ); | |
} | |
public void put( Object key, Object value ) throws CacheException { | |
hashtable.put( key, value ); | |
} | |
public void remove( Object key ) throws CacheException { | |
hashtable.remove( key ); | |
} | |
public void clear() throws CacheException { | |
hashtable.clear(); | |
} | |
public int size() { | |
return hashtable.size(); | |
} | |
public Set keys() { | |
if ( !hashtable.isEmpty() ) { | |
return Collections.unmodifiableSet( hashtable.keySet() ); | |
} else { | |
return Collections.EMPTY_SET; | |
} | |
} | |
public Set values() { | |
if ( !hashtable.isEmpty() ) { | |
Collection values = hashtable.values(); | |
if ( values instanceof Set ) { | |
return Collections.unmodifiableSet( (Set)values ); | |
} else { | |
return Collections.unmodifiableSet( new LinkedHashSet( values ) ); | |
} | |
} else { | |
return Collections.EMPTY_SET; | |
} | |
} | |
public String toString() { | |
return "HashtableCache [" + name + "]"; | |
} | |
} |