/*
 * 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.lucene.facet.taxonomy.writercache;

import org.apache.lucene.facet.taxonomy.FacetLabel;

An LRU cache of mapping from name to int.
Used to cache Ordinals of category paths.
It uses as key, hash of the path instead of the path.
This way the cache takes less RAM, but correctness depends on
assuming no collisions. 
@lucene.experimental
/**
 * An LRU cache of mapping from name to int.
 * Used to cache Ordinals of category paths.
 * It uses as key, hash of the path instead of the path.
 * This way the cache takes less RAM, but correctness depends on
 * assuming no collisions. 
 * 
 * @lucene.experimental
 */
public class NameHashIntCacheLRU extends NameIntCacheLRU {

  NameHashIntCacheLRU(int maxCacheSize) {
    super(maxCacheSize);
  }

  @Override
  Object key(FacetLabel name) {
    return name.longHashCode();
  }

  @Override
  Object key(FacetLabel name, int prefixLen) {
    return name.subpath(prefixLen).longHashCode();
  }
  
}