/**
* Copyright T Jake Luciani
*
* 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.
*/
package lucandra;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
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.util.OpenBitSet;
public class LucandraFilter extends Filter {
private static final long serialVersionUID = 1L;
private List<Term> terms = new ArrayList<Term>();
public void addTerm(Term term) {
terms.add(term);
}
public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
OpenBitSet result = new OpenBitSet(reader.maxDoc());
OpenBitSet docsHit = ((lucandra.IndexReader) reader).getDocsHit();
List<ByteBuffer> filteredValues = new ArrayList<ByteBuffer>();
for(int i=0; i<docsHit.capacity(); i++){
if(docsHit.fastGet(i))
filteredValues.add(ByteBuffer.wrap(CassandraUtils.writeVInt(i)));
}
if (filteredValues.size() == 0)
return null;
LucandraTermDocs termDocs = (LucandraTermDocs) reader.termDocs();
for (Term term : terms) {
LucandraTermInfo[] terms = termDocs.filteredSeek(term, filteredValues);
// This is a conjunction and at least one value must match
if (terms == null)
return null;
while (termDocs.next()) {
result.set(termDocs.doc());
}
}
termDocs.close();
return result;
}
}