org.apache.lucene.codecs

Class PushPostingsWriterBase

java.lang.Object

org.apache.lucene.codecs.PostingsWriterBase

org.apache.lucene.codecs.PushPostingsWriterBase

All Implemented Interfaces:

Closeable, AutoCloseable

Direct Known Subclasses:

Lucene50PostingsWriter

public abstract class PushPostingsWriterBase
extends PostingsWriterBase

Extension of PostingsWriterBase, adding a push API for writing each element of the postings. This API is somewhat analagous to an XML SAX API, while PostingsWriterBase is more like an XML DOM API.

See Also:

PostingsReaderBase

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 FieldInfo	fieldInfo FieldInfo of current field being written.
protected IndexOptions	indexOptions IndexOptions of current field being written
protected boolean	writeFreqs True if the current field writes freqs.
protected boolean	writeOffsets True if the current field writes offsets.
protected boolean	writePayloads True if the current field writes payloads.
protected boolean	writePositions True if the current field writes positions.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PushPostingsWriterBase() Sole constructor.

Method Summary

Modifier and Type	Method and Description
abstract void	addPosition(int position, BytesRef payload, int startOffset, int endOffset) Add a new position and payload, and start/end offset.
abstract void	finishDoc() Called when we are done adding positions and payloads for each doc.
abstract void	finishTerm(BlockTermState state) Finishes the current term.
abstract BlockTermState	newTermState() Return a newly created empty TermState
int	setField(FieldInfo fieldInfo) Sets the current field for writing, and returns the fixed length of long[] metadata (which is fixed per field), called when the writing switches to another field.
abstract void	startDoc(int docID, int freq) Adds a new doc in this term.
abstract void	startTerm() Start a new term.
BlockTermState	writeTerm(BytesRef term, TermsEnum termsEnum, FixedBitSet docsSeen) Write all postings for one term; use the provided TermsEnum to pull a PostingsEnum.

Methods inherited from class org.apache.lucene.codecs.PostingsWriterBase

close, encodeTerm, init

Methods inherited from class java.lang.Object

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

Field Detail

fieldInfo

protected FieldInfo fieldInfo

FieldInfo of current field being written.

indexOptions

protected IndexOptions indexOptions

IndexOptions of current field being written

writeFreqs

protected boolean writeFreqs

True if the current field writes freqs.

writePositions

protected boolean writePositions

True if the current field writes positions.

writePayloads

protected boolean writePayloads

True if the current field writes payloads.

writeOffsets

protected boolean writeOffsets

True if the current field writes offsets.

Constructor Detail

PushPostingsWriterBase

protected PushPostingsWriterBase()

Sole constructor. (For invocation by subclass constructors, typically implicit.)

Method Detail

newTermState

public abstract BlockTermState newTermState()
                                     throws IOException

Return a newly created empty TermState

Throws:

IOException

startTerm

public abstract void startTerm()
                        throws IOException

Start a new term. Note that a matching call to finishTerm(BlockTermState) is done, only if the term has at least one document.

Throws:

IOException

finishTerm

public abstract void finishTerm(BlockTermState state)
                         throws IOException

Finishes the current term. The provided BlockTermState contains the term's summary statistics, and will holds metadata from PBF when returned

Throws:

IOException

setField

public int setField(FieldInfo fieldInfo)

Sets the current field for writing, and returns the fixed length of long[] metadata (which is fixed per field), called when the writing switches to another field.

Specified by:

setField in class PostingsWriterBase

writeTerm

public final BlockTermState writeTerm(BytesRef term,
                                      TermsEnum termsEnum,
                                      FixedBitSet docsSeen)
                               throws IOException

Description copied from class: PostingsWriterBase

Write all postings for one term; use the provided TermsEnum to pull a PostingsEnum. This method should not re-position the TermsEnum! It is already positioned on the term that should be written. This method must set the bit in the provided FixedBitSet for every docID written. If no docs were written, this method should return null, and the terms dict will skip the term.

Specified by:

writeTerm in class PostingsWriterBase

Throws:

IOException

startDoc

public abstract void startDoc(int docID,
                              int freq)
                       throws IOException

Adds a new doc in this term. freq will be -1 when term frequencies are omitted for the field.

Throws:

IOException

addPosition

public abstract void addPosition(int position,
                                 BytesRef payload,
                                 int startOffset,
                                 int endOffset)
                          throws IOException

Add a new position and payload, and start/end offset. A null payload means no payload; a non-null payload with zero length also means no payload. Caller may reuse the BytesRef for the payload between calls (method must fully consume the payload). startOffset and endOffset will be -1 when offsets are not indexed.

Throws:

IOException

finishDoc

public abstract void finishDoc()
                        throws IOException

Called when we are done adding positions and payloads for each doc.

Throws:

IOException