/**

  * Copyright 2005-2013 Dozer Project

  *

  * 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.dozer.cache;

 import org.dozer.util.MappingUtils;

 import org.slf4j.LoggerFactory;

 import org.slf4j.Logger;

 import java.util.Collection;

 import java.util.HashMap;

 import java.util.HashSet;

 import java.util.Map;

 import java.util.Map.Entry;

 import java.util.Set;

 /**

  * Internal class that manages the Dozer caches. Only intended for internal use.

  * 

  * @author tierney.matt

  */

 public final class DozerCacheManager implements CacheManager {

   private final Logger log = LoggerFactory.getLogger(DozerCacheManager.class);

   private final Map<String, Cache> cachesMap = new HashMap<String, Cache>();

   public Collection<Cache> getCaches() {

     return new HashSet<Cache>(cachesMap.values());

   }

   public Cache getCache(String name) {

     Cache cache = cachesMap.get(name);

     if (cache == null) {

       MappingUtils.throwMappingException("Unable to find cache with name: " + name);

     }

     return cache;

   }

   public void addCache(String name, int maxElementsInMemory) {

     addCache(new DozerCache(name, maxElementsInMemory));

   }

   public void addCache(Cache cache) {

     synchronized (cachesMap) {

       String name = cache.getName();

       if (cacheExists(name)) {

         MappingUtils.throwMappingException("Cache already exists with name: " + name);

       }

       cachesMap.put(name, cache);

     }

   }

   public Collection<String> getCacheNames() {

     Set<String> results = new HashSet<String>();

     for (Entry<String, Cache> entry : cachesMap.entrySet()) {

       results.add(entry.getKey());

     }

     return results;

   }

   /*

    * Dont clear keys in caches map because these are only added 1 time at startup. Only clear cache entries for each cache

    */

   public void clearAllEntries() {

     for (Cache cache : cachesMap.values()) {

       cache.clear();

     }

   }

   public boolean cacheExists(String name) {

     return cachesMap.containsKey(name);

   }

   public void logCaches() {

     log.info(getCaches().toString());

   }

 }