/*
* 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 org.apache.lucene.search.uhighlight;
import java.io.IOException;
import java.util.List;
import org.apache.lucene.index.IndexOptions;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.LeafReader;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.index.ReaderUtil;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.automaton.CharacterRunAutomaton;
/**
* Uses offsets in postings -- {@link IndexOptions#DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS}. This
* does not support multi-term queries; the highlighter will fallback on analysis for that.
*
* @lucene.internal
*/
public class PostingsOffsetStrategy extends FieldOffsetStrategy {
public PostingsOffsetStrategy(String field, BytesRef[] queryTerms, PhraseHelper phraseHelper, CharacterRunAutomaton[] automata) {
super(field, queryTerms, phraseHelper, automata);
}
@Override
public List<OffsetsEnum> getOffsetsEnums(IndexReader reader, int docId, String content) throws IOException {
final LeafReader leafReader;
if (reader instanceof LeafReader) {
leafReader = (LeafReader) reader;
} else {
List<LeafReaderContext> leaves = reader.leaves();
LeafReaderContext leafReaderContext = leaves.get(ReaderUtil.subIndex(docId, leaves));
leafReader = leafReaderContext.reader();
docId -= leafReaderContext.docBase; // adjust 'doc' to be within this leaf reader
}
return createOffsetsEnumsFromReader(leafReader, docId);
}
@Override
public UnifiedHighlighter.OffsetSource getOffsetSource() {
return UnifiedHighlighter.OffsetSource.POSTINGS;
}
}