org.elasticsearch.index.search.MultiMatchQuery Maven / Gradle / Ivy
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* Licensed to ElasticSearch and Shay Banon under one
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* 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
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package org.elasticsearch.index.search;
import org.apache.lucene.search.BooleanClause;
import org.apache.lucene.search.BooleanQuery;
import org.apache.lucene.search.DisjunctionMaxQuery;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.index.query.QueryParseContext;
import java.io.IOException;
import java.util.Map;
public class MultiMatchQuery extends MatchQuery {
private boolean useDisMax = true;
private float tieBreaker;
public void setUseDisMax(boolean useDisMax) {
this.useDisMax = useDisMax;
}
public void setTieBreaker(float tieBreaker) {
this.tieBreaker = tieBreaker;
}
public MultiMatchQuery(QueryParseContext parseContext) {
super(parseContext);
}
private Query parseAndApply(Type type, String fieldName, Object value, String minimumShouldMatch) throws IOException {
Query query = parse(type, fieldName, value);
if (query instanceof BooleanQuery) {
Queries.applyMinimumShouldMatch((BooleanQuery) query, minimumShouldMatch);
}
return query;
}
public Query parse(Type type, Map fieldNames, Object value, String minimumShouldMatch) throws IOException {
if (fieldNames.size() == 1) {
Map.Entry fieldBoost = fieldNames.entrySet().iterator().next();
Float boostValue = fieldBoost.getValue();
final Query query = parseAndApply(type, fieldBoost.getKey(), value, minimumShouldMatch);
if (boostValue != null) {
query.setBoost(boostValue);
}
return query;
}
if (useDisMax) {
DisjunctionMaxQuery disMaxQuery = new DisjunctionMaxQuery(tieBreaker);
boolean clauseAdded = false;
for (String fieldName : fieldNames.keySet()) {
Query query = parseAndApply(type, fieldName, value, minimumShouldMatch);
Float boostValue = fieldNames.get(fieldName);
if (boostValue != null) {
query.setBoost(boostValue);
}
if (query != null) {
clauseAdded = true;
disMaxQuery.add(query);
}
}
return clauseAdded ? disMaxQuery : null;
} else {
BooleanQuery booleanQuery = new BooleanQuery();
for (String fieldName : fieldNames.keySet()) {
Query query = parseAndApply(type, fieldName, value, minimumShouldMatch);
Float boostValue = fieldNames.get(fieldName);
if (boostValue != null) {
query.setBoost(boostValue);
}
if (query != null) {
booleanQuery.add(query, BooleanClause.Occur.SHOULD);
}
}
return !booleanQuery.clauses().isEmpty() ? booleanQuery : null;
}
}
}