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/*
* Licensed to Elasticsearch 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 org.apache.lucene.search.similarities.AfterEffect;
import org.apache.lucene.search.similarities.AfterEffectB;
import org.apache.lucene.search.similarities.AfterEffectL;
import org.apache.lucene.search.similarities.BasicModel;
import org.apache.lucene.search.similarities.BasicModelBE;
import org.apache.lucene.search.similarities.BasicModelD;
import org.apache.lucene.search.similarities.BasicModelG;
import org.apache.lucene.search.similarities.BasicModelIF;
import org.apache.lucene.search.similarities.BasicModelIn;
import org.apache.lucene.search.similarities.BasicModelIne;
import org.apache.lucene.search.similarities.BasicModelP;
import org.apache.lucene.search.similarities.DFRSimilarity;
import org.apache.lucene.search.similarities.Normalization;
import org.apache.lucene.search.similarities.Similarity;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.assistedinject.Assisted;
import org.elasticsearch.common.settings.Settings;
import java.util.HashMap;
import java.util.Map;
import static java.util.Collections.unmodifiableMap;
/**
* {@link SimilarityProvider} for {@link DFRSimilarity}.
* <p>
* Configuration options available:
* <ul>
* <li>basic_model</li>
* <li>after_effect</li>
* <li>normalization</li>
* </ul>
* @see DFRSimilarity For more information about configuration
*/
public class DFRSimilarityProvider extends AbstractSimilarityProvider {
private static final Map<String, BasicModel> MODEL_CACHE;
private static final Map<String, AfterEffect> EFFECT_CACHE;
static {
Map<String, BasicModel> models = new HashMap<>();
models.put("be", new BasicModelBE());
models.put("d", new BasicModelD());
models.put("g", new BasicModelG());
models.put("if", new BasicModelIF());
models.put("in", new BasicModelIn());
models.put("ine", new BasicModelIne());
models.put("p", new BasicModelP());
MODEL_CACHE = unmodifiableMap(models);
Map<String, AfterEffect> effects = new HashMap<>();
effects.put("no", new AfterEffect.NoAfterEffect());
effects.put("b", new AfterEffectB());
effects.put("l", new AfterEffectL());
EFFECT_CACHE = unmodifiableMap(effects);
}
private final DFRSimilarity similarity;
public DFRSimilarityProvider(String name, Settings settings) {
super(name);
BasicModel basicModel = parseBasicModel(settings);
AfterEffect afterEffect = parseAfterEffect(settings);
Normalization normalization = parseNormalization(settings);
this.similarity = new DFRSimilarity(basicModel, afterEffect, normalization);
}
/**
* Parses the given Settings and creates the appropriate {@link BasicModel}
*
* @param settings Settings to parse
* @return {@link BasicModel} referred to in the Settings
*/
protected BasicModel parseBasicModel(Settings settings) {
String basicModel = settings.get("basic_model");
BasicModel model = MODEL_CACHE.get(basicModel);
if (model == null) {
throw new IllegalArgumentException("Unsupported BasicModel [" + basicModel + "]");
}
return model;
}
/**
* Parses the given Settings and creates the appropriate {@link AfterEffect}
*
* @param settings Settings to parse
* @return {@link AfterEffect} referred to in the Settings
*/
protected AfterEffect parseAfterEffect(Settings settings) {
String afterEffect = settings.get("after_effect");
AfterEffect effect = EFFECT_CACHE.get(afterEffect);
if (effect == null) {
throw new IllegalArgumentException("Unsupported AfterEffect [" + afterEffect + "]");
}
return effect;
}
/**
* {@inheritDoc}
*/
@Override
public Similarity get() {
return similarity;
}
}
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