org.elasticsearch.common.lucene.search.MatchNoDocsQuery Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of elasticsearch Show documentation
Show all versions of elasticsearch Show documentation
Elasticsearch subproject :server
/*
* 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.common.lucene.search;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Weight;
import org.apache.lucene.search.ConstantScoreWeight;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Explanation;
import org.apache.lucene.search.Scorer;
import java.io.IOException;
import java.util.Set;
/**
* A query that matches no documents and prints the reason why in the toString method.
*/
public class MatchNoDocsQuery extends Query {
/**
* The reason why the query does not match any document.
*/
private final String reason;
public MatchNoDocsQuery(String reason) {
this.reason = reason;
}
public Weight createWeight(IndexSearcher searcher, boolean needsScores) throws IOException {
return new ConstantScoreWeight(this) {
@Override
public void extractTerms(Set terms) {
}
@Override
public Explanation explain(LeafReaderContext context, int doc) throws IOException {
return Explanation.noMatch(reason);
}
@Override
public Scorer scorer(LeafReaderContext context) throws IOException {
return null;
}
};
}
@Override
public String toString(String field) {
return "MatchNoDocsQuery[\"" + reason + "\"]";
}
@Override
public boolean equals(Object obj) {
return sameClassAs(obj);
}
@Override
public int hashCode() {
return classHash();
}
}