package proj.zoie.api;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF 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.
*/
import java.io.IOException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.Query;
/**
* Filter implementation based on a list of uids
*/
public class UIDFilter extends Filter {
private static final long serialVersionUID = 1L;
private final long[] _filteredIDs;
public UIDFilter(long[] filteredIDs) {
_filteredIDs = filteredIDs;
}
@Override
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
if (reader instanceof ZoieIndexReader<?>) {
return new UIDDocIdSet(_filteredIDs, ((ZoieIndexReader<?>)reader).getDocIDMaper());
}
else {
throw new IllegalArgumentException(
"UIDFilter may only load from ZoieIndexReader instances");
}
}
/**
* Convenience method to build a Query from a uid list
* @param uids
* @return
*/
public static Query getUIDQuery(long[] uids){
return new ConstantScoreQuery(new UIDFilter(uids));
}
}