Class PostingsWriterBase

Extension of PostingsConsumer to support pluggable term dictionaries.

This class contains additional hooks to interact with the provided term dictionaries such as BlockTreeTermsWriter. If you want to re-use an existing implementation and are only interested in customizing the format of the postings list, extend this class instead.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk
Inheritance
System.Object
PostingsConsumer
PostingsWriterBase
Lucene41PostingsWriter
Implements
IDisposable
Inherited Members
Namespace: Lucene.Net.Codecs
Assembly: Lucene.Net.dll
Syntax
public abstract class PostingsWriterBase : PostingsConsumer, IDisposable

Constructors

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PostingsWriterBase()

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

Declaration
protected PostingsWriterBase()

Methods

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Dispose()

Disposes all resources used by this object.

Declaration
public void Dispose()
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Dispose(Boolean)

Implementations must override and should dispose all resources used by this instance.

Declaration
protected abstract void Dispose(bool disposing)
Parameters
Type Name Description
System.Boolean disposing
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EncodeTerm(Int64[], DataOutput, FieldInfo, BlockTermState, Boolean)

Encode metadata as long[] and byte[]. absolute controls whether current term is delta encoded according to latest term. Usually elements in longs are file pointers, so each one always increases when a new term is consumed. out is used to write generic bytes, which are not monotonic.

NOTE: sometimes long[] might contain "don't care" values that are unused, e.g. the pointer to postings list may not be defined for some terms but is defined for others, if it is designed to inline some postings data in term dictionary. In this case, the postings writer should always use the last value, so that each element in metadata long[] remains monotonic.

Declaration
public abstract void EncodeTerm(long[] longs, DataOutput out, FieldInfo fieldInfo, BlockTermState state, bool absolute)
Parameters
Type Name Description
System.Int64[] longs
DataOutput out
FieldInfo fieldInfo
BlockTermState state
System.Boolean absolute
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FinishTerm(BlockTermState)

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

Declaration
public abstract void FinishTerm(BlockTermState state)
Parameters
Type Name Description
BlockTermState state
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Init(IndexOutput)

Called once after startup, before any terms have been added. Implementations typically write a header to the provided termsOut.

Declaration
public abstract void Init(IndexOutput termsOut)
Parameters
Type Name Description
IndexOutput termsOut
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NewTermState()

Return a newly created empty TermState

Declaration
public abstract BlockTermState NewTermState()
Returns
Type Description
BlockTermState
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SetField(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.

Declaration
public abstract int SetField(FieldInfo fieldInfo)
Parameters
Type Name Description
FieldInfo fieldInfo
Returns
Type Description
System.Int32
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StartTerm()

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

Declaration
public abstract void StartTerm()

Implements

IDisposable

See Also