/*
* 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.common.lucene.search;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermDocs;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.apache.lucene.util.OpenBitSet;
import java.io.IOException;
/**
* A simple filter for a specific term.
*
* @author kimchy (shay.banon)
*/
public class TermFilter extends Filter {
private final Term term;
public TermFilter(Term term) {
this.term = term;
}
public Term getTerm() {
return term;
}
@Override public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
OpenBitSet result = null;
TermDocs td = reader.termDocs();
try {
td.seek(term);
if (td.next()) {
result = new OpenBitSet(reader.maxDoc());
result.fastSet(td.doc());
while (td.next()) {
result.fastSet(td.doc());
}
}
} finally {
td.close();
}
return result;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
TermFilter that = (TermFilter) o;
if (term != null ? !term.equals(that.term) : that.term != null) return false;
return true;
}
@Override
public int hashCode() {
return term != null ? term.hashCode() : 0;
}
@Override public String toString() {
return term.field() + ":" + term.text();
}
}