| /* |
| * 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.HashSet; |
| import java.util.List; |
| import java.util.Set; |
| |
| import org.apache.lucene.codecs.uniformsplit.BlockEncoder; |
| import org.apache.lucene.codecs.uniformsplit.BlockLine; |
| import org.apache.lucene.codecs.uniformsplit.BlockWriter; |
| import org.apache.lucene.codecs.uniformsplit.FieldMetadata; |
| import org.apache.lucene.codecs.uniformsplit.IndexDictionary; |
| import org.apache.lucene.codecs.uniformsplit.TermBytes; |
| import org.apache.lucene.store.IndexOutput; |
| import org.apache.lucene.util.BytesRef; |
| |
| /** |
| * Writes terms blocks with the Shared Terms format. |
| * <p> |
| * As defined in {@link STUniformSplitTermsWriter}, all the fields terms are |
| * shared in the same dictionary. Each block line contains a term and all the |
| * fields {@link org.apache.lucene.index.TermState}s for this term. |
| * |
| * @lucene.experimental |
| */ |
| public class STBlockWriter extends BlockWriter { |
| |
| protected final Set<FieldMetadata> fieldsInBlock; |
| |
| public STBlockWriter(IndexOutput blockOutput, int targetNumBlockLines, int deltaNumLines, BlockEncoder blockEncoder) { |
| super(blockOutput, targetNumBlockLines, deltaNumLines, blockEncoder); |
| fieldsInBlock = new HashSet<>(); |
| } |
| |
| /** |
| * Adds a new {@link BlockLine} term for the current field. |
| * <p> |
| * This method determines whether the new term is part of the current block, |
| * or if it is part of the next block. In the latter case, a new block is started |
| * (including one or more of the lastly added lines), the current block is |
| * written to the block file, and the current block key is added to the |
| * {@link org.apache.lucene.codecs.uniformsplit.IndexDictionary.Builder}. |
| * |
| * @param term The block line term. The {@link BytesRef} instance is used directly, |
| * the caller is responsible to make a deep copy if needed. This is required |
| * because we keep a list of block lines until we decide to write the |
| * current block, and each line must have a different term instance. |
| * @param termStates Block line details for all fields in the line. |
| * @param dictionaryBuilder to which the block keys are added. |
| */ |
| public void addLine(BytesRef term, List<FieldMetadataTermState> termStates, |
| IndexDictionary.Builder dictionaryBuilder) throws IOException { |
| if (termStates.isEmpty()) { |
| return; |
| } |
| int mdpLength = TermBytes.computeMdpLength(lastTerm, term); |
| blockLines.add(new STBlockLine(new TermBytes(mdpLength, term), termStates)); |
| lastTerm = term; |
| if (blockLines.size() >= targetNumBlockLines + deltaNumLines) { |
| splitAndWriteBlock(dictionaryBuilder); |
| } |
| } |
| |
| @Override |
| protected void finishLastBlock(IndexDictionary.Builder dictionaryBuilder) throws IOException { |
| // Make this method accessible to package. |
| super.finishLastBlock(dictionaryBuilder); |
| } |
| |
| @Override |
| protected BlockLine.Serializer createBlockLineSerializer() { |
| return new STBlockLine.Serializer(); |
| } |
| |
| @Override |
| protected void writeBlockLine(boolean isIncrementalEncodingSeed, BlockLine line, BlockLine previousLine) throws IOException { |
| blockLineWriter.writeLine(blockLinesWriteBuffer, line, previousLine, Math.toIntExact(termStatesWriteBuffer.size()), isIncrementalEncodingSeed); |
| ((STBlockLine.Serializer) blockLineWriter).writeLineTermStates(termStatesWriteBuffer, (STBlockLine) line, termStateSerializer); |
| ((STBlockLine) line).collectFields(fieldsInBlock); |
| } |
| |
| @Override |
| protected void updateFieldMetadata(long blockStartFP) { |
| assert !fieldsInBlock.isEmpty(); |
| for (FieldMetadata fieldMetadata : fieldsInBlock) { |
| if (fieldMetadata.getFirstBlockStartFP() == -1) { |
| fieldMetadata.setFirstBlockStartFP(blockStartFP); |
| } |
| fieldMetadata.setLastBlockStartFP(blockStartFP); |
| } |
| fieldsInBlock.clear(); |
| } |
| } |