org.elasticsearch.index.similarity.Similarities Maven / Gradle / Ivy
/*
* Licensed to ElasticSearch and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. ElasticSearch 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.elasticsearch.index.similarity;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMap;
import org.apache.lucene.search.similarities.*;
import org.elasticsearch.common.collect.MapBuilder;
/**
* Cache of pre-defined Similarities
*/
public class Similarities {
private static final ImmutableMap PRE_BUILT_SIMILARITIES;
static {
MapBuilder similarities = MapBuilder.newMapBuilder();
similarities.put("default", new PreBuiltSimilarityProvider.Factory("default", new DefaultSimilarity()));
similarities.put("BM25", new PreBuiltSimilarityProvider.Factory("BM25", new BM25Similarity()));
PRE_BUILT_SIMILARITIES = similarities.immutableMap();
}
private Similarities() {
}
/**
* Returns the list of pre-defined SimilarityProvider Factories
*
* @return Pre-defined SimilarityProvider Factories
*/
public static ImmutableCollection listFactories() {
return PRE_BUILT_SIMILARITIES.values();
}
}