content: package org.apache.lucene.util.cache;
  
  /**
   * 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.
   */
  
  import java.util.LinkedHashMap;
  import java.util.Map;
  
  /**
   * Simple LRU cache implementation that uses a LinkedHashMap.
   * This cache is not synchronized, use {@link Cache#synchronizedCache(Cache)}
   * if needed.
   * 
   */
  public class SimpleLRUCache<K,V> extends SimpleMapCache<K,V> {
    private final static float LOADFACTOR = 0.75f;
  
    /**
     * Creates a last-recently-used cache with the specified size. 
     */
    public SimpleLRUCache(final int cacheSize) {
      super(new LinkedHashMap<K,V>((int) Math.ceil(cacheSize / LOADFACTOR) + 1, LOADFACTOR, true) {
        @Override
        protected boolean removeEldestEntry(Map.Entry<K, V> eldest) {
          return size() > cacheSize;
        }
      });
    }
    
    
  
  }
  