org.apache.lucene.codecs.uniformsplit.sharedterms

Class STBlockWriter

java.lang.Object

org.apache.lucene.codecs.uniformsplit.BlockWriter

org.apache.lucene.codecs.uniformsplit.sharedterms.STBlockWriter

public class STBlockWriter
extends BlockWriter

Writes terms blocks with the Shared Terms format.

As defined in STUniformSplitTermsWriter, all the fields terms are shared in the same dictionary. Each block line contains a term and all the fields TermStates for this term.

WARNING: This API is experimental and might change in incompatible ways in the next release.

Field Summary

Fields

Modifier and Type	Field and Description
protected Set<FieldMetadata>	fieldsInBlock

Fields inherited from class org.apache.lucene.codecs.uniformsplit.BlockWriter

blockEncoder, blockHeaderWriter, blockLines, blockLinesWriteBuffer, blockLineWriter, blockOutput, blockWriteBuffer, deltaNumLines, fieldMetadata, lastTerm, reusableBlockHeader, scratchBytesRef, targetNumBlockLines, termStateSerializer, termStatesWriteBuffer

Constructor Summary

Constructors

Constructor and Description
STBlockWriter(IndexOutput blockOutput, int targetNumBlockLines, int deltaNumLines, BlockEncoder blockEncoder)

Method Summary

Modifier and Type	Method and Description
void	addLine(BytesRef term, List<FieldMetadataTermState> termStates, IndexDictionary.Builder dictionaryBuilder) Adds a new BlockLine term for the current field.
protected BlockLine.Serializer	createBlockLineSerializer()
protected void	finishLastBlock(IndexDictionary.Builder dictionaryBuilder) This method is called when there is no more term for the field.
protected void	updateFieldMetadata(long blockStartFP) updates the field metadata after all lines were written for the block.
protected void	writeBlockLine(boolean isIncrementalEncodingSeed, BlockLine line, BlockLine previousLine)

Methods inherited from class org.apache.lucene.codecs.uniformsplit.BlockWriter

addBlockKey, addLine, createBlockHeaderSerializer, createDeltaBaseTermStateSerializer, splitAndWriteBlock, writeBlock

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

fieldsInBlock

protected final Set<FieldMetadata> fieldsInBlock

Constructor Detail

STBlockWriter

public STBlockWriter(IndexOutput blockOutput,
                     int targetNumBlockLines,
                     int deltaNumLines,
                     BlockEncoder blockEncoder)

Method Detail

addLine

public void addLine(BytesRef term,
                    List<FieldMetadataTermState> termStates,
                    IndexDictionary.Builder dictionaryBuilder)
             throws IOException

Adds a new BlockLine term for the current field.

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 IndexDictionary.Builder.

Parameters:

term - The block line term. The 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.

termStates - Block line details for all fields in the line.

dictionaryBuilder - to which the block keys are added.

Throws:

IOException

finishLastBlock

protected void finishLastBlock(IndexDictionary.Builder dictionaryBuilder)
                        throws IOException

Description copied from class: BlockWriter

This method is called when there is no more term for the field. It writes the remaining lines added with BlockWriter.addLine(org.apache.lucene.util.BytesRef, org.apache.lucene.codecs.BlockTermState, org.apache.lucene.codecs.uniformsplit.IndexDictionary.Builder) as the last block of the field and resets this BlockWriter state. Then this BlockWriter can be used for another field.

Overrides:

finishLastBlock in class BlockWriter

Throws:

IOException

createBlockLineSerializer

protected BlockLine.Serializer createBlockLineSerializer()

Overrides:

createBlockLineSerializer in class BlockWriter

writeBlockLine

protected void writeBlockLine(boolean isIncrementalEncodingSeed,
                              BlockLine line,
                              BlockLine previousLine)
                       throws IOException

Overrides:

writeBlockLine in class BlockWriter

Throws:

IOException

updateFieldMetadata

protected void updateFieldMetadata(long blockStartFP)

Description copied from class: BlockWriter

updates the field metadata after all lines were written for the block.

Overrides:

updateFieldMetadata in class BlockWriter