/*
* 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.search.nested;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.PrefixFilter;
import org.apache.lucene.util.OpenBitSet;
import org.elasticsearch.index.mapper.internal.TypeFieldMapper;
import java.io.IOException;
public class NonNestedDocsFilter extends Filter {
public static final NonNestedDocsFilter INSTANCE = new NonNestedDocsFilter();
private final PrefixFilter filter = new PrefixFilter(new Term(TypeFieldMapper.NAME, "__"));
private final int hashCode = filter.hashCode();
private NonNestedDocsFilter() {
}
@Override public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
DocIdSet docSet = filter.getDocIdSet(reader);
if (docSet == null || docSet == DocIdSet.EMPTY_DOCIDSET) {
// will almost never happen, and we need an OpenBitSet for the parent filter in
// BlockJoinQuery, we cache it anyhow...
docSet = new OpenBitSet(reader.maxDoc());
}
((OpenBitSet) docSet).flip(0, reader.maxDoc());
return docSet;
}
@Override public int hashCode() {
return hashCode;
}
@Override public boolean equals(Object obj) {
return obj == INSTANCE;
}
}