Lucene::ConstantScoreAutoRewrite Class Reference

A rewrite method that tries to pick the best constant-score rewrite method based on term and document counts from the query. If both the number of terms and documents is small enough, then CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE is used. Otherwise, CONSTANT_SCORE_FILTER_REWRITE is used. More...

#include <MultiTermQuery.h>

Inheritance diagram for Lucene::ConstantScoreAutoRewrite:

Public Member Functions
	ConstantScoreAutoRewrite ()
virtual	~ConstantScoreAutoRewrite ()
virtual String	getClassName ()
boost::shared_ptr< ConstantScoreAutoRewrite >	shared_from_this ()
virtual void	setTermCountCutoff (int32_t count)
	If the number of terms in this query is equal to or larger than this setting then CONSTANT_SCORE_FILTER_REWRITE is used. More...
virtual int32_t	getTermCountCutoff ()
virtual void	setDocCountPercent (double percent)
	If the number of documents to be visited in the postings exceeds this specified percentage of the maxDoc() for the index, then CONSTANT_SCORE_FILTER_REWRITE is used. More...
virtual double	getDocCountPercent ()
virtual QueryPtr	rewrite (const IndexReaderPtr &reader, const MultiTermQueryPtr &query)
virtual int32_t	hashCode ()
	Return hash code for this object. More...
virtual bool	equals (const LuceneObjectPtr &other)
	Return whether two objects are equal. More...
Public Member Functions inherited from Lucene::RewriteMethod
virtual	~RewriteMethod ()
boost::shared_ptr< RewriteMethod >	shared_from_this ()
Public Member Functions inherited from Lucene::LuceneObject
virtual	~LuceneObject ()
virtual void	initialize ()
	Called directly after instantiation to create objects that depend on this object being fully constructed. More...
virtual LuceneObjectPtr	clone (const LuceneObjectPtr &other=LuceneObjectPtr())
	Return clone of this object. More...
virtual int32_t	compareTo (const LuceneObjectPtr &other)
	Compare two objects. More...
virtual String	toString ()
	Returns a string representation of the object. More...
Public Member Functions inherited from Lucene::LuceneSync
virtual	~LuceneSync ()
virtual SynchronizePtr	getSync ()
	Return this object synchronize lock. More...
virtual LuceneSignalPtr	getSignal ()
	Return this object signal. More...
virtual void	lock (int32_t timeout=0)
	Lock this object using an optional timeout. More...
virtual void	unlock ()
	Unlock this object. More...
virtual bool	holdsLock ()
	Returns true if this object is currently locked by current thread. More...
virtual void	wait (int32_t timeout=0)
	Wait for signal using an optional timeout. More...
virtual void	notifyAll ()
	Notify all threads waiting for signal. More...

Static Public Member Functions
static String	_getClassName ()
Static Public Member Functions inherited from Lucene::RewriteMethod
static String	_getClassName ()

Static Public Attributes
static const int32_t	DEFAULT_TERM_COUNT_CUTOFF
static const double	DEFAULT_DOC_COUNT_PERCENT

Protected Attributes
int32_t	termCountCutoff
double	docCountPercent
Protected Attributes inherited from Lucene::LuceneSync
SynchronizePtr	objectLock
LuceneSignalPtr	objectSignal

Additional Inherited Members
Protected Member Functions inherited from Lucene::LuceneObject
	LuceneObject ()

Detailed Description

A rewrite method that tries to pick the best constant-score rewrite method based on term and document counts from the query. If both the number of terms and documents is small enough, then CONSTANT_SCORE_BOOLEAN_QUERY_REWRITE is used. Otherwise, CONSTANT_SCORE_FILTER_REWRITE is used.

Constructor & Destructor Documentation

Lucene::ConstantScoreAutoRewrite::ConstantScoreAutoRewrite

(

)

virtual Lucene::ConstantScoreAutoRewrite::~ConstantScoreAutoRewrite ( )

virtual

Member Function Documentation

static String Lucene::ConstantScoreAutoRewrite::_getClassName ( )

inlinestatic

virtual bool Lucene::ConstantScoreAutoRewrite::equals ( const LuceneObjectPtr &  other )

virtual

Return whether two objects are equal.

Reimplemented from Lucene::LuceneObject.

virtual String Lucene::ConstantScoreAutoRewrite::getClassName ( )

inlinevirtual

Reimplemented from Lucene::RewriteMethod.

virtual double Lucene::ConstantScoreAutoRewrite::getDocCountPercent ( )

virtual

See also

setDocCountPercent

virtual int32_t Lucene::ConstantScoreAutoRewrite::getTermCountCutoff ( )

virtual

See also

setTermCountCutoff

virtual int32_t Lucene::ConstantScoreAutoRewrite::hashCode ( )

virtual

Return hash code for this object.

Reimplemented from Lucene::LuceneObject.

virtual QueryPtr Lucene::ConstantScoreAutoRewrite::rewrite ( const IndexReaderPtr &  reader, const MultiTermQueryPtr &  query  )

virtual

Implements Lucene::RewriteMethod.

virtual void Lucene::ConstantScoreAutoRewrite::setDocCountPercent ( double  percent )

virtual

If the number of documents to be visited in the postings exceeds this specified percentage of the maxDoc() for the index, then CONSTANT_SCORE_FILTER_REWRITE is used.

Parameters

percent

0.0 to 100.0

virtual void Lucene::ConstantScoreAutoRewrite::setTermCountCutoff ( int32_t  count )

virtual

If the number of terms in this query is equal to or larger than this setting then CONSTANT_SCORE_FILTER_REWRITE is used.

boost::shared_ptr< ConstantScoreAutoRewrite > Lucene::ConstantScoreAutoRewrite::shared_from_this ( )

inline

Field Documentation

const double Lucene::ConstantScoreAutoRewrite::DEFAULT_DOC_COUNT_PERCENT

static

const int32_t Lucene::ConstantScoreAutoRewrite::DEFAULT_TERM_COUNT_CUTOFF

static

double Lucene::ConstantScoreAutoRewrite::docCountPercent

protected

int32_t Lucene::ConstantScoreAutoRewrite::termCountCutoff

protected

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The documentation for this class was generated from the following file:

• MultiTermQuery.h