| /* |
| * 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.uniformsplit.sharedterms; |
| |
| import java.io.IOException; |
| import java.util.Collection; |
| |
| import org.apache.lucene.codecs.PostingsReaderBase; |
| import org.apache.lucene.codecs.uniformsplit.BlockDecoder; |
| import org.apache.lucene.codecs.uniformsplit.FieldMetadata; |
| import org.apache.lucene.codecs.uniformsplit.IndexDictionary; |
| import org.apache.lucene.codecs.uniformsplit.UniformSplitTerms; |
| import org.apache.lucene.codecs.uniformsplit.UniformSplitTermsReader; |
| import org.apache.lucene.index.FieldInfos; |
| import org.apache.lucene.index.SegmentReadState; |
| import org.apache.lucene.store.IndexInput; |
| |
| import static org.apache.lucene.codecs.uniformsplit.sharedterms.STUniformSplitPostingsFormat.*; |
| |
| /** |
| * A block-based terms index and dictionary based on the Uniform Split technique, |
| * and sharing all the fields terms in the same dictionary, with all the fields |
| * of a term in the same block line. |
| * |
| * @see STUniformSplitTermsWriter |
| * @lucene.experimental |
| */ |
| public class STUniformSplitTermsReader extends UniformSplitTermsReader { |
| |
| /** |
| * @see UniformSplitTermsReader#UniformSplitTermsReader(PostingsReaderBase, SegmentReadState, BlockDecoder, boolean) |
| */ |
| public STUniformSplitTermsReader(PostingsReaderBase postingsReader, SegmentReadState state, BlockDecoder blockDecoder, |
| boolean dictionaryOnHeap) throws IOException { |
| this(postingsReader, state, blockDecoder, dictionaryOnHeap, FieldMetadata.Serializer.INSTANCE, |
| NAME, VERSION_START, VERSION_CURRENT, TERMS_BLOCKS_EXTENSION, TERMS_DICTIONARY_EXTENSION); |
| } |
| |
| /** |
| * @see UniformSplitTermsReader#UniformSplitTermsReader(PostingsReaderBase, SegmentReadState, BlockDecoder, boolean) |
| */ |
| protected STUniformSplitTermsReader(PostingsReaderBase postingsReader, SegmentReadState state, BlockDecoder blockDecoder, |
| boolean dictionaryOnHeap, FieldMetadata.Serializer fieldMetadataReader, |
| String codecName, int versionStart, int versionCurrent, |
| String termsBlocksExtension, String dictionaryExtension) throws IOException { |
| super(postingsReader, state, blockDecoder, dictionaryOnHeap, fieldMetadataReader, codecName, versionStart, versionCurrent, termsBlocksExtension, dictionaryExtension); |
| } |
| |
| @Override |
| protected void fillFieldMap(PostingsReaderBase postingsReader, SegmentReadState state, BlockDecoder blockDecoder, |
| boolean dictionaryOnHeap, IndexInput dictionaryInput, IndexInput blockInput, |
| Collection<FieldMetadata> fieldMetadataCollection, FieldInfos fieldInfos) throws IOException { |
| if (!fieldMetadataCollection.isEmpty()) { |
| FieldMetadata unionFieldMetadata = createUnionFieldMetadata(fieldMetadataCollection); |
| // Share the same immutable dictionary between all fields. |
| IndexDictionary.BrowserSupplier dictionaryBrowserSupplier = createDictionaryBrowserSupplier(state, dictionaryInput, unionFieldMetadata, blockDecoder, dictionaryOnHeap); |
| for (FieldMetadata fieldMetadata : fieldMetadataCollection) { |
| fieldToTermsMap.put(fieldMetadata.getFieldInfo().name, |
| new STUniformSplitTerms(blockInput, fieldMetadata, unionFieldMetadata, postingsReader, blockDecoder, fieldInfos, dictionaryBrowserSupplier)); |
| } |
| } |
| } |
| |
| @Override |
| protected long getTermsRamBytesUsed() { |
| long termsRamUsage = 0L; |
| long dictionaryRamUsage = 0L; |
| for (UniformSplitTerms terms : fieldToTermsMap.values()) { |
| termsRamUsage += terms.ramBytesUsedWithoutDictionary(); |
| dictionaryRamUsage = terms.getDictionaryRamBytesUsed(); |
| } |
| termsRamUsage += dictionaryRamUsage; |
| return termsRamUsage; |
| } |
| |
| /** |
| * Creates a virtual {@link FieldMetadata} that is the union of the given {@link FieldMetadata}s. |
| * Its {@link FieldMetadata#getFirstBlockStartFP}, {@link FieldMetadata#getLastBlockStartFP} |
| * and {@link FieldMetadata#getLastTerm()} are respectively the min and |
| * max among the {@link FieldMetadata}s provided as parameter. |
| */ |
| protected FieldMetadata createUnionFieldMetadata(Iterable<FieldMetadata> fieldMetadataIterable) { |
| UnionFieldMetadataBuilder builder = new UnionFieldMetadataBuilder(); |
| for (FieldMetadata fieldMetadata : fieldMetadataIterable) { |
| builder.addFieldMetadata(fieldMetadata); |
| } |
| return builder.build(); |
| } |
| } |