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/*
* Licensed to Elastic Search and Shay Banon under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Elastic Search 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.query.support;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.search.*;
import org.elasticsearch.index.cache.IndexCache;
import org.elasticsearch.index.mapper.MapperService;
import org.elasticsearch.util.trove.ExtTObjectFloatHashMap;
import javax.annotation.Nullable;
import java.util.ArrayList;
import java.util.List;
/**
* @author kimchy (shay.banon)
*/
public class MultiFieldMapperQueryParser extends MapperQueryParser {
private List fields;
private ExtTObjectFloatHashMap boosts;
private float tieBreaker = 0.0f;
private boolean useDisMax = true;
public MultiFieldMapperQueryParser(List fields, @Nullable ExtTObjectFloatHashMap boosts, Analyzer analyzer, @Nullable MapperService mapperService, @Nullable IndexCache indexCache) {
super(null, analyzer, mapperService, indexCache);
this.fields = fields;
this.boosts = boosts;
if (this.boosts != null) {
boosts.defaultReturnValue(1.0f);
}
}
public void setTieBreaker(float tieBreaker) {
this.tieBreaker = tieBreaker;
}
public void setUseDisMax(boolean useDisMax) {
this.useDisMax = useDisMax;
}
@Override public Query getFieldQuery(String field, String queryText) throws ParseException {
return getFieldQuery(field, queryText, 0);
}
@Override public Query getFieldQuery(String xField, String queryText, int slop) throws ParseException {
if (xField != null) {
Query q = super.getFieldQuery(xField, queryText);
applySlop(q, slop);
return q;
}
if (useDisMax) {
DisjunctionMaxQuery disMaxQuery = new DisjunctionMaxQuery(tieBreaker);
boolean added = false;
for (String field : fields) {
Query q = super.getFieldQuery(field, queryText);
if (q != null) {
added = true;
applyBoost(field, q);
applySlop(q, slop);
disMaxQuery.add(q);
}
}
if (!added) {
return null;
}
return disMaxQuery;
} else {
List clauses = new ArrayList();
for (String field : fields) {
Query q = super.getFieldQuery(field, queryText);
if (q != null) {
applyBoost(field, q);
applySlop(q, slop);
clauses.add(new BooleanClause(q, BooleanClause.Occur.SHOULD));
}
}
if (clauses.size() == 0) // happens for stopwords
return null;
return getBooleanQuery(clauses, true);
}
}
@Override protected Query getRangeQuery(String xField, String part1, String part2, boolean inclusive) throws ParseException {
if (xField != null) {
return super.getRangeQuery(xField, part1, part2, inclusive);
}
if (useDisMax) {
DisjunctionMaxQuery disMaxQuery = new DisjunctionMaxQuery(tieBreaker);
boolean added = false;
for (String field : fields) {
Query q = super.getRangeQuery(field, part1, part2, inclusive);
if (q != null) {
added = true;
applyBoost(field, q);
disMaxQuery.add(q);
}
}
if (!added) {
return null;
}
return disMaxQuery;
} else {
List clauses = new ArrayList();
for (String field : fields) {
Query q = super.getRangeQuery(field, part1, part2, inclusive);
if (q != null) {
applyBoost(field, q);
clauses.add(new BooleanClause(q, BooleanClause.Occur.SHOULD));
}
}
if (clauses.size() == 0) // happens for stopwords
return null;
return getBooleanQuery(clauses, true);
}
}
@Override protected Query getPrefixQuery(String xField, String termStr) throws ParseException {
if (xField != null) {
return super.getPrefixQuery(xField, termStr);
}
if (useDisMax) {
DisjunctionMaxQuery disMaxQuery = new DisjunctionMaxQuery(tieBreaker);
boolean added = false;
for (String field : fields) {
Query q = super.getPrefixQuery(field, termStr);
if (q != null) {
added = true;
applyBoost(field, q);
disMaxQuery.add(q);
}
}
if (!added) {
return null;
}
return disMaxQuery;
} else {
List clauses = new ArrayList();
for (String field : fields) {
Query q = super.getPrefixQuery(field, termStr);
if (q != null) {
applyBoost(field, q);
clauses.add(new BooleanClause(q, BooleanClause.Occur.SHOULD));
}
}
if (clauses.size() == 0) // happens for stopwords
return null;
return getBooleanQuery(clauses, true);
}
}
@Override protected Query getWildcardQuery(String xField, String termStr) throws ParseException {
if (xField != null) {
return super.getWildcardQuery(xField, termStr);
}
if (useDisMax) {
DisjunctionMaxQuery disMaxQuery = new DisjunctionMaxQuery(tieBreaker);
boolean added = false;
for (String field : fields) {
Query q = super.getWildcardQuery(field, termStr);
if (q != null) {
added = true;
applyBoost(field, q);
disMaxQuery.add(q);
}
}
if (!added) {
return null;
}
return disMaxQuery;
} else {
List clauses = new ArrayList();
for (String field : fields) {
Query q = super.getWildcardQuery(field, termStr);
if (q != null) {
applyBoost(field, q);
clauses.add(new BooleanClause(q, BooleanClause.Occur.SHOULD));
}
}
if (clauses.size() == 0) // happens for stopwords
return null;
return getBooleanQuery(clauses, true);
}
}
@Override protected Query getFuzzyQuery(String xField, String termStr, float minSimilarity) throws ParseException {
if (xField != null) {
return super.getFuzzyQuery(xField, termStr, minSimilarity);
}
if (useDisMax) {
DisjunctionMaxQuery disMaxQuery = new DisjunctionMaxQuery(tieBreaker);
boolean added = false;
for (String field : fields) {
Query q = super.getFuzzyQuery(field, termStr, minSimilarity);
if (q != null) {
added = true;
applyBoost(field, q);
disMaxQuery.add(q);
}
}
if (!added) {
return null;
}
return disMaxQuery;
} else {
List clauses = new ArrayList();
for (String field : fields) {
Query q = super.getFuzzyQuery(field, termStr, minSimilarity);
applyBoost(field, q);
clauses.add(new BooleanClause(q, BooleanClause.Occur.SHOULD));
}
return getBooleanQuery(clauses, true);
}
}
private void applyBoost(String field, Query q) {
if (boosts != null) {
float boost = boosts.get(field);
q.setBoost(boost);
}
}
private void applySlop(Query q, int slop) {
if (q instanceof PhraseQuery) {
((PhraseQuery) q).setSlop(slop);
} else if (q instanceof MultiPhraseQuery) {
((MultiPhraseQuery) q).setSlop(slop);
}
}
}