package org.apache.lucene.index.codecs.standard;
/**
* 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 java.util.Set;
import org.apache.lucene.index.SegmentInfo;
import org.apache.lucene.index.SegmentWriteState;
import org.apache.lucene.index.SegmentReadState;
import org.apache.lucene.index.codecs.Codec;
import org.apache.lucene.index.codecs.FieldsConsumer;
import org.apache.lucene.index.codecs.FieldsProducer;
import org.apache.lucene.index.codecs.PostingsWriterBase;
import org.apache.lucene.index.codecs.PostingsReaderBase;
import org.apache.lucene.index.codecs.TermsIndexWriterBase;
import org.apache.lucene.index.codecs.TermsIndexReaderBase;
import org.apache.lucene.index.codecs.VariableGapTermsIndexWriter;
import org.apache.lucene.index.codecs.VariableGapTermsIndexReader;
import org.apache.lucene.index.codecs.BlockTermsWriter;
import org.apache.lucene.index.codecs.BlockTermsReader;
import org.apache.lucene.store.Directory;
/** Default codec.
* @lucene.experimental */
public class StandardCodec extends Codec {
public StandardCodec() {
name = "Standard";
}
@Override
public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws IOException {
PostingsWriterBase docs = new StandardPostingsWriter(state);
// TODO: should we make the terms index more easily
// pluggable? Ie so that this codec would record which
// index impl was used, and switch on loading?
// Or... you must make a new Codec for this?
TermsIndexWriterBase indexWriter;
boolean success = false;
try {
indexWriter = new VariableGapTermsIndexWriter(state, new VariableGapTermsIndexWriter.EveryNTermSelector(state.termIndexInterval));
success = true;
} finally {
if (!success) {
docs.close();
}
}
success = false;
try {
FieldsConsumer ret = new BlockTermsWriter(indexWriter, state, docs);
success = true;
return ret;
} finally {
if (!success) {
try {
docs.close();
} finally {
indexWriter.close();
}
}
}
}
public final static int TERMS_CACHE_SIZE = 1024;
@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
PostingsReaderBase postings = new StandardPostingsReader(state.dir, state.segmentInfo, state.readBufferSize, state.codecId);
TermsIndexReaderBase indexReader;
boolean success = false;
try {
indexReader = new VariableGapTermsIndexReader(state.dir,
state.fieldInfos,
state.segmentInfo.name,
state.termsIndexDivisor,
state.codecId);
success = true;
} finally {
if (!success) {
postings.close();
}
}
success = false;
try {
FieldsProducer ret = new BlockTermsReader(indexReader,
state.dir,
state.fieldInfos,
state.segmentInfo.name,
postings,
state.readBufferSize,
TERMS_CACHE_SIZE,
state.codecId);
success = true;
return ret;
} finally {
if (!success) {
try {
postings.close();
} finally {
indexReader.close();
}
}
}
}
/** Extension of freq postings file */
static final String FREQ_EXTENSION = "frq";
/** Extension of prox postings file */
static final String PROX_EXTENSION = "prx";
@Override
public void files(Directory dir, SegmentInfo segmentInfo, String id, Set<String> files) throws IOException {
StandardPostingsReader.files(dir, segmentInfo, id, files);
BlockTermsReader.files(dir, segmentInfo, id, files);
VariableGapTermsIndexReader.files(dir, segmentInfo, id, files);
}
@Override
public void getExtensions(Set<String> extensions) {
getStandardExtensions(extensions);
}
public static void getStandardExtensions(Set<String> extensions) {
extensions.add(FREQ_EXTENSION);
extensions.add(PROX_EXTENSION);
BlockTermsReader.getExtensions(extensions);
VariableGapTermsIndexReader.getIndexExtensions(extensions);
}
}