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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.common.lucene.docset;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.util.OpenBitSet;
import java.io.IOException;
/**
* @author kimchy (Shay Banon)
*/
public class DocSets {
public static DocSet convert(IndexReader reader, DocIdSet docIdSet) throws IOException {
if (docIdSet == null) {
return DocSet.EMPTY_DOC_SET;
} else if (docIdSet instanceof DocSet) {
return (DocSet) docIdSet;
} else if (docIdSet instanceof OpenBitSet) {
return new OpenBitDocSet((OpenBitSet) docIdSet);
} else {
final DocIdSetIterator it = docIdSet.iterator();
// null is allowed to be returned by iterator(),
// in this case we wrap with the empty set,
// which is cacheable.
return (it == null) ? DocSet.EMPTY_DOC_SET : new OpenBitDocSet(it, reader.maxDoc());
}
}
/**
* Returns a cacheable version of the doc id set (might be the same instance provided as a parameter).
*/
public static DocSet cacheable(IndexReader reader, DocIdSet docIdSet) throws IOException {
if (docIdSet == null) {
return DocSet.EMPTY_DOC_SET;
} else if (docIdSet.isCacheable() && (docIdSet instanceof DocSet)) {
return (DocSet) docIdSet;
} else if (docIdSet instanceof OpenBitSet) {
return new OpenBitDocSet((OpenBitSet) docIdSet);
} else {
final DocIdSetIterator it = docIdSet.iterator();
// null is allowed to be returned by iterator(),
// in this case we wrap with the empty set,
// which is cacheable.
return (it == null) ? DocSet.EMPTY_DOC_SET : new OpenBitDocSet(it, reader.maxDoc());
}
}
private DocSets() {
}
}