org.apache.lucene.codecs.appending.AppendingPostingsFormat Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of lucene-codecs Show documentation
Show all versions of lucene-codecs Show documentation
Apache Lucene (module: codecs)
package org.apache.lucene.codecs.appending;
/*
* 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.FieldsConsumer;
import org.apache.lucene.codecs.FieldsProducer;
import org.apache.lucene.codecs.PostingsFormat;
import org.apache.lucene.codecs.PostingsReaderBase;
import org.apache.lucene.codecs.lucene40.Lucene40PostingsReader;
import org.apache.lucene.index.SegmentReadState;
import org.apache.lucene.index.SegmentWriteState;
/**
* Appending postings impl.
*/
class AppendingPostingsFormat extends PostingsFormat {
public static String CODEC_NAME = "Appending";
public AppendingPostingsFormat() {
super(CODEC_NAME);
}
@Override
public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws IOException {
throw new UnsupportedOperationException("this codec can only be used for reading");
}
@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
PostingsReaderBase postings = new Lucene40PostingsReader(state.directory, state.fieldInfos, state.segmentInfo, state.context, state.segmentSuffix);
boolean success = false;
try {
FieldsProducer ret = new AppendingTermsReader(
state.directory,
state.fieldInfos,
state.segmentInfo,
postings,
state.context,
state.segmentSuffix,
state.termsIndexDivisor);
success = true;
return ret;
} finally {
if (!success) {
postings.close();
}
}
}
}