package org.apache.lucene.codecs.lucene3x;
/*
* 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.codecs.TermVectorsFormat;
import org.apache.lucene.codecs.TermVectorsReader;
import org.apache.lucene.codecs.TermVectorsWriter;
import org.apache.lucene.index.FieldInfos;
import org.apache.lucene.index.IndexFileNames;
import org.apache.lucene.index.SegmentInfo;
import org.apache.lucene.store.CompoundFileDirectory;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IOContext;
/**
* Lucene3x ReadOnly TermVectorsFormat implementation
* @deprecated (4.0) This is only used to read indexes created
* before 4.0.
* @lucene.experimental
*/
@Deprecated
class Lucene3xTermVectorsFormat extends TermVectorsFormat {
@Override
public TermVectorsReader vectorsReader(Directory directory, SegmentInfo segmentInfo, FieldInfos fieldInfos, IOContext context) throws IOException {
final String fileName = IndexFileNames.segmentFileName(Lucene3xSegmentInfoFormat.getDocStoreSegment(segmentInfo), "", Lucene3xTermVectorsReader.VECTORS_FIELDS_EXTENSION);
// Unfortunately, for 3.x indices, each segment's
// FieldInfos can lie about hasVectors (claim it's true
// when really it's false).... so we have to carefully
// check if the files really exist before trying to open
// them (4.x has fixed this):
final boolean exists;
if (Lucene3xSegmentInfoFormat.getDocStoreOffset(segmentInfo) != -1 && Lucene3xSegmentInfoFormat.getDocStoreIsCompoundFile(segmentInfo)) {
String cfxFileName = IndexFileNames.segmentFileName(Lucene3xSegmentInfoFormat.getDocStoreSegment(segmentInfo), "", Lucene3xCodec.COMPOUND_FILE_STORE_EXTENSION);
if (segmentInfo.dir.fileExists(cfxFileName)) {
Directory cfsDir = new CompoundFileDirectory(segmentInfo.dir, cfxFileName, context, false);
try {
exists = cfsDir.fileExists(fileName);
} finally {
cfsDir.close();
}
} else {
exists = false;
}
} else {
exists = directory.fileExists(fileName);
}
if (!exists) {
// 3x's FieldInfos sometimes lies and claims a segment
// has vectors when it doesn't:
return null;
} else {
return new Lucene3xTermVectorsReader(directory, segmentInfo, fieldInfos, context);
}
}
@Override
public TermVectorsWriter vectorsWriter(Directory directory, SegmentInfo segmentInfo, IOContext context) throws IOException {
throw new UnsupportedOperationException("this codec can only be used for reading");
}
}