| /* |
| * 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.codecs.blockterms; |
| |
| 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.PostingsWriterBase; |
| import org.apache.lucene.codecs.lucene84.Lucene84PostingsFormat; // javadocs |
| import org.apache.lucene.codecs.lucene84.Lucene84PostingsReader; |
| import org.apache.lucene.codecs.lucene84.Lucene84PostingsWriter; |
| import org.apache.lucene.index.SegmentReadState; |
| import org.apache.lucene.index.SegmentWriteState; |
| |
| // TODO: we could make separate base class that can wrap |
| // any PostingsFormat and make it ord-able... |
| |
| /** |
| * Customized version of {@link Lucene84PostingsFormat} that uses |
| * {@link VariableGapTermsIndexWriter} with a fixed interval. |
| */ |
| public final class LuceneVarGapFixedInterval extends PostingsFormat { |
| final int termIndexInterval; |
| |
| public LuceneVarGapFixedInterval() { |
| this(FixedGapTermsIndexWriter.DEFAULT_TERM_INDEX_INTERVAL); |
| } |
| |
| public LuceneVarGapFixedInterval(int termIndexInterval) { |
| super("LuceneVarGapFixedInterval"); |
| this.termIndexInterval = termIndexInterval; |
| } |
| |
| @Override |
| public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws IOException { |
| PostingsWriterBase docs = new Lucene84PostingsWriter(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(termIndexInterval)); |
| success = true; |
| } finally { |
| if (!success) { |
| docs.close(); |
| } |
| } |
| |
| success = false; |
| try { |
| // Must use BlockTermsWriter (not BlockTree) because |
| // BlockTree doens't support ords (yet)... |
| FieldsConsumer ret = new BlockTermsWriter(indexWriter, state, docs); |
| success = true; |
| return ret; |
| } finally { |
| if (!success) { |
| try { |
| docs.close(); |
| } finally { |
| indexWriter.close(); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException { |
| PostingsReaderBase postings = new Lucene84PostingsReader(state); |
| TermsIndexReaderBase indexReader; |
| |
| boolean success = false; |
| try { |
| indexReader = new VariableGapTermsIndexReader(state); |
| success = true; |
| } finally { |
| if (!success) { |
| postings.close(); |
| } |
| } |
| |
| success = false; |
| try { |
| FieldsProducer ret = new BlockTermsReader(indexReader, postings, state); |
| 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"; |
| } |