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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.apache.lucene.queries;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermContext;
import org.apache.lucene.search.BooleanClause.Occur;
import org.apache.lucene.search.Query;
import org.elasticsearch.common.lucene.search.Queries;
import org.elasticsearch.index.mapper.MappedFieldType;
/**
* Extended version of {@link CommonTermsQuery} that allows to pass in a
* <tt>minimumNumberShouldMatch</tt> specification that uses the actual num of high frequent terms
* to calculate the minimum matching terms.
*/
public class ExtendedCommonTermsQuery extends CommonTermsQuery {
private final MappedFieldType fieldType;
public ExtendedCommonTermsQuery(Occur highFreqOccur, Occur lowFreqOccur, float maxTermFrequency, MappedFieldType fieldType) {
super(highFreqOccur, lowFreqOccur, maxTermFrequency);
this.fieldType = fieldType;
}
private String lowFreqMinNumShouldMatchSpec;
private String highFreqMinNumShouldMatchSpec;
@Override
protected int calcLowFreqMinimumNumberShouldMatch(int numOptional) {
return calcMinimumNumberShouldMatch(lowFreqMinNumShouldMatchSpec, numOptional);
}
protected int calcMinimumNumberShouldMatch(String spec, int numOptional) {
if (spec == null) {
return 0;
}
return Queries.calculateMinShouldMatch(numOptional, spec);
}
@Override
protected int calcHighFreqMinimumNumberShouldMatch(int numOptional) {
return calcMinimumNumberShouldMatch(highFreqMinNumShouldMatchSpec, numOptional);
}
public void setHighFreqMinimumNumberShouldMatch(String spec) {
this.highFreqMinNumShouldMatchSpec = spec;
}
public String getHighFreqMinimumNumberShouldMatchSpec() {
return highFreqMinNumShouldMatchSpec;
}
public void setLowFreqMinimumNumberShouldMatch(String spec) {
this.lowFreqMinNumShouldMatchSpec = spec;
}
public String getLowFreqMinimumNumberShouldMatchSpec() {
return lowFreqMinNumShouldMatchSpec;
}
public float getMaxTermFrequency() {
return this.maxTermFrequency;
}
@Override
protected Query newTermQuery(Term term, TermContext context) {
if (fieldType == null) {
return super.newTermQuery(term, context);
}
final Query query = fieldType.queryStringTermQuery(term);
if (query == null) {
return super.newTermQuery(term, context);
} else {
return query;
}
}
}
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