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