Lucene::DoubleComparator Class Reference

Parses field's values as double (using FieldCache#getDoubles and sorts by ascending value. More...

#include <FieldComparator.h>

Inheritance diagram for Lucene::DoubleComparator:

Public Member Functions
	DoubleComparator (int32_t numHits, const String &field, const ParserPtr &parser)
virtual	~DoubleComparator ()
virtual String	getClassName ()
boost::shared_ptr< DoubleComparator >	shared_from_this ()
virtual int32_t	compare (int32_t slot1, int32_t slot2)
	Compare hit at slot1 with hit at slot2.
virtual int32_t	compareBottom (int32_t doc)
	Compare the bottom of the queue with doc. This will only invoked after setBottom has been called. This should return the same result as compare(int,int)} as if bottom were slot1 and the new document were slot 2.
virtual void	setNextReader (const IndexReaderPtr &reader, int32_t docBase)
	Set a new Reader. All doc correspond to the current Reader.
Public Member Functions inherited from Lucene::NumericComparator< double >
	NumericComparator (int32_t numHits, const String &field=EmptyString)
virtual	~NumericComparator ()
virtual void	copy (int32_t slot, int32_t doc)
	This method is called when a new hit is competitive. You should copy any state associated with this document that will be required for future comparisons, into the specified slot.
virtual void	setBottom (int32_t slot)
	Set the bottom slot, ie the "weakest" (sorted last) entry in the queue. When compareBottom is called, you should compare against this slot. This will always be called before compareBottom.
virtual ComparableValue	value (int32_t slot)
	Return the actual value in the slot.
Public Member Functions inherited from Lucene::FieldComparator
virtual	~FieldComparator ()
boost::shared_ptr< FieldComparator >	shared_from_this ()
virtual void	setScorer (const ScorerPtr &scorer)
	Sets the Scorer to use in case a document's score is needed.
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.
virtual LuceneObjectPtr	clone (const LuceneObjectPtr &other=LuceneObjectPtr())
	Return clone of this object.
virtual int32_t	hashCode ()
	Return hash code for this object.
virtual bool	equals (const LuceneObjectPtr &other)
	Return whether two objects are equal.
virtual int32_t	compareTo (const LuceneObjectPtr &other)
	Compare two objects.
virtual String	toString ()
	Returns a string representation of the object.
Public Member Functions inherited from Lucene::LuceneSync
virtual	~LuceneSync ()
virtual SynchronizePtr	getSync ()
	Return this object synchronize lock.
virtual LuceneSignalPtr	getSignal ()
	Return this object signal.
virtual void	lock (int32_t timeout=0)
	Lock this object using an optional timeout.
virtual void	unlock ()
	Unlock this object.
virtual bool	holdsLock ()
	Returns true if this object is currently locked by current thread.
virtual void	wait (int32_t timeout=0)
	Wait for signal using an optional timeout.
virtual void	notifyAll ()
	Notify all threads waiting for signal.

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

Protected Attributes
DoubleParserPtr	parser
Protected Attributes inherited from Lucene::NumericComparator< double >
Collection< double >	values
Collection< double >	currentReaderValues
String	field
double	bottom
Protected Attributes inherited from Lucene::LuceneSync
SynchronizePtr	objectLock
LuceneSignalPtr	objectSignal

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

Detailed Description

Parses field's values as double (using FieldCache#getDoubles and sorts by ascending value.

Constructor & Destructor Documentation

DoubleComparator()

Lucene::DoubleComparator::DoubleComparator	(	int32_t	numHits,
		const String &	field,
		const ParserPtr &	parser
	)

~DoubleComparator()

virtual Lucene::DoubleComparator::~DoubleComparator ( )

virtual

Member Function Documentation

_getClassName()

static String Lucene::DoubleComparator::_getClassName ( )

inlinestatic

compare()

virtual int32_t Lucene::DoubleComparator::compare ( int32_t  slot1, int32_t  slot2  )

virtual

Compare hit at slot1 with hit at slot2.

Parameters

slot1	first slot to compare
slot2	second slot to compare

Returns

any N < 0 if slot2's value is sorted after slot1, any N > 0 if the slot2's value is sorted before slot1 and 0 if they are equal

Reimplemented from Lucene::NumericComparator< double >.

compareBottom()

virtual int32_t Lucene::DoubleComparator::compareBottom ( int32_t  doc )

virtual

Compare the bottom of the queue with doc. This will only invoked after setBottom has been called. This should return the same result as compare(int,int)} as if bottom were slot1 and the new document were slot 2.

For a search that hits many results, this method will be the hotspot (invoked by far the most frequently).

Parameters

doc	that was hit

Returns

any N < 0 if the doc's value is sorted after the bottom entry (not competitive), any N > 0 if the doc's value is sorted before the bottom entry and 0 if they are equal.

Reimplemented from Lucene::NumericComparator< double >.

getClassName()

virtual String Lucene::DoubleComparator::getClassName ( )

inlinevirtual

Reimplemented from Lucene::FieldComparator.

setNextReader()

virtual void Lucene::DoubleComparator::setNextReader ( const IndexReaderPtr &  reader, int32_t  docBase  )

virtual

Set a new Reader. All doc correspond to the current Reader.

Parameters

reader	current reader
docBase	docBase of this reader

Implements Lucene::FieldComparator.

shared_from_this()

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

inline

Field Documentation

parser

DoubleParserPtr Lucene::DoubleComparator::parser

protected

---

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

• FieldComparator.h