mongo::Projection Class Reference

#include <projection.h>

Classes
class	KeyOnly
Public Member Functions
KeyOnly *	checkKey (const BSONObj &keyPattern) const
BSONObj	getSpec () const
void	init (const BSONObj &spec)
	Projection ()
void	transform (const BSONObj &in, BSONObjBuilder &b) const
BSONObj	transform (const BSONObj &in) const
Private Types
typedef map< string, boost::shared_ptr< Projection > >	FieldMap
Private Member Functions
void	add (const string &field, int skip, int limit)
void	add (const string &field, bool include)
void	append (BSONObjBuilder &b, const BSONElement &e) const
void	appendArray (BSONObjBuilder &b, const BSONObj &a, bool nested=false) const
Private Attributes
FieldMap	_fields
bool	_hasNonSimple
bool	_include
bool	_includeID
int	_limit
int	_skip
BSONObj	_source
bool	_special

Detailed Description

given a document and a projection specification can transform the document currently supports specifying which fields and $slice

Definition at line 30 of file projection.h.

typedef map<string, boost::shared_ptr<Projection> > mongo::Projection::FieldMap [private]

Definition at line 114 of file projection.h.

mongo::Projection::Projection ( ) [inline]

Definition at line 57 of file projection.h.

void mongo::Projection::append	(	BSONObjBuilder &	b,
		const BSONElement &	e
	)			const `[private]`

appends e to b if user wants it will descend into e if needed

void mongo::Projection::appendArray	(	BSONObjBuilder &	b,
		const BSONObj &	a,
		bool	nested = `false`
	)			const `[private]`

KeyOnly* mongo::Projection::checkKey ( const BSONObj & keyPattern ) const

Returns:: if the keyPattern has all the information needed to return then return a new KeyOnly otherwise null NOTE: a key may have modified the actual data which has to be handled above this (arrays, geo)

BSONObj mongo::Projection::getSpec ( ) const [inline]