| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.ki.cache; |
| |
| import java.util.Collection; |
| import java.util.Collections; |
| import java.util.LinkedHashSet; |
| import java.util.Map; |
| import java.util.Set; |
| |
| import org.apache.ki.util.Destroyable; |
| |
| /** |
| * A <code>MapCache</code> is a {@link Cache Cache} implementation that uses a backing {@link Map} instance to store |
| * and retrieve cached data. |
| * |
| * @author Les Hazlewood |
| * @since 1.0 |
| */ |
| public class MapCache implements Cache, Destroyable { |
| |
| /** |
| * Backing instance. |
| */ |
| private final Map map; |
| |
| /** |
| * The name of this cache. |
| */ |
| private final String name; |
| |
| public MapCache(String name, Map backingMap) { |
| if (name == null) { |
| throw new IllegalArgumentException("Cache name cannot be null."); |
| } |
| if (backingMap == null) { |
| throw new IllegalArgumentException("Backing map cannot be null."); |
| } |
| this.name = name; |
| this.map = backingMap; |
| } |
| |
| public Object get(Object key) throws CacheException { |
| return map.get(key); |
| } |
| |
| @SuppressWarnings({"unchecked"}) |
| public void put(Object key, Object value) throws CacheException { |
| map.put(key, value); |
| } |
| |
| public void remove(Object key) throws CacheException { |
| map.remove(key); |
| } |
| |
| public void clear() throws CacheException { |
| map.clear(); |
| } |
| |
| public int size() { |
| return map.size(); |
| } |
| |
| @SuppressWarnings({"unchecked"}) |
| public Set keys() { |
| if (!map.isEmpty()) { |
| return Collections.unmodifiableSet(map.keySet()); |
| } else { |
| return Collections.EMPTY_SET; |
| } |
| } |
| |
| @SuppressWarnings({"unchecked"}) |
| public Set values() { |
| if (!map.isEmpty()) { |
| Collection values = map.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 getClass().getName() + " : [" + name + "]"; |
| } |
| |
| public void destroy() throws Exception { |
| clear(); |
| } |
| } |