QGIS API Documentation  2.15.0-Master (af20121)
Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
QgsExpression::NodeBinaryOperator Class Reference

#include <qgsexpression.h>

Inheritance diagram for QgsExpression::NodeBinaryOperator:
Inheritance graph
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Public Member Functions

 NodeBinaryOperator (BinaryOperator op, Node *opLeft, Node *opRight)
 
 ~NodeBinaryOperator ()
 
virtual void accept (Visitor &v) const override
 Support the visitor pattern. More...
 
virtual Nodeclone () const override
 Generate a clone of this node. More...
 
virtual QString dump () const override
 Abstract virtual dump method. More...
 
virtual QVariant eval (QgsExpression *parent, const QgsExpressionContext *context) override
 Abstract virtual eval method Errors are reported to the parent. More...
 
bool leftAssociative () const
 
virtual bool needsGeometry () const override
 Abstract virtual method which returns if the geometry is required to evaluate this expression. More...
 
virtual NodeType nodeType () const override
 Abstract virtual that returns the type of this node. More...
 
BinaryOperator op () const
 
NodeopLeft () const
 
NodeopRight () const
 
int precedence () const
 
virtual bool prepare (QgsExpression *parent, const QgsExpressionContext *context) override
 Abstract virtual preparation method Errors are reported to the parent. More...
 
virtual QStringList referencedColumns () const override
 Abstract virtual method which returns a list of columns required to evaluate this node. More...
 
- Public Member Functions inherited from QgsExpression::Node
virtual ~Node ()
 
virtual Q_DECL_DEPRECATED QVariant eval (QgsExpression *parent, const QgsFeature *f)
 Abstract virtual eval method Errors are reported to the parent. More...
 
virtual Q_DECL_DEPRECATED bool prepare (QgsExpression *parent, const QgsFields &fields)
 Abstract virtual preparation method Errors are reported to the parent. More...
 

Protected Member Functions

bool compare (double diff)
 
QDateTime computeDateTimeFromInterval (const QDateTime &d, QgsInterval *i)
 Computes the result date time calculation from a start datetime and an interval. More...
 
double computeDouble (double x, double y)
 
int computeInt (int x, int y)
 

Protected Attributes

BinaryOperator mOp
 
NodemOpLeft
 
NodemOpRight
 

Detailed Description

Definition at line 994 of file qgsexpression.h.

Constructor & Destructor Documentation

QgsExpression::NodeBinaryOperator::NodeBinaryOperator ( BinaryOperator  op,
Node opLeft,
Node opRight 
)
inline

Definition at line 997 of file qgsexpression.h.

QgsExpression::NodeBinaryOperator::~NodeBinaryOperator ( )
inline

Definition at line 1002 of file qgsexpression.h.

Member Function Documentation

virtual void QgsExpression::NodeBinaryOperator::accept ( Visitor v) const
inlineoverridevirtual

Support the visitor pattern.

For any implementation this should look like

C++:

v.visit( *this );

Python:

v.visit( self)
Parameters
vA visitor that visits this node.

Implements QgsExpression::Node.

Definition at line 1015 of file qgsexpression.h.

QgsExpression::Node * QgsExpression::NodeBinaryOperator::clone ( ) const
overridevirtual

Generate a clone of this node.

Make sure that the clone does not contain any information which is generated in prepare and context related. Ownership is transferred to the caller.

Returns
a deep copy of this node.

Implements QgsExpression::Node.

Definition at line 4449 of file qgsexpression.cpp.

bool QgsExpression::NodeBinaryOperator::compare ( double  diff)
protected

Definition at line 4253 of file qgsexpression.cpp.

QDateTime QgsExpression::NodeBinaryOperator::computeDateTimeFromInterval ( const QDateTime d,
QgsInterval i 
)
protected

Computes the result date time calculation from a start datetime and an interval.

Parameters
dstart datetime
iinterval to add or subtract (depending on mOp)

Definition at line 4295 of file qgsexpression.cpp.

double QgsExpression::NodeBinaryOperator::computeDouble ( double  x,
double  y 
)
protected

Definition at line 4309 of file qgsexpression.cpp.

int QgsExpression::NodeBinaryOperator::computeInt ( int  x,
int  y 
)
protected

Definition at line 4275 of file qgsexpression.cpp.

QString QgsExpression::NodeBinaryOperator::dump ( ) const
overridevirtual

Abstract virtual dump method.

Returns
An expression which represents this node as string

Implements QgsExpression::Node.

Definition at line 4418 of file qgsexpression.cpp.

QVariant QgsExpression::NodeBinaryOperator::eval ( QgsExpression parent,
const QgsExpressionContext context 
)
overridevirtual

Abstract virtual eval method Errors are reported to the parent.

Note
added in QGIS 2.12

Reimplemented from QgsExpression::Node.

Definition at line 4001 of file qgsexpression.cpp.

bool QgsExpression::NodeBinaryOperator::leftAssociative ( ) const

Definition at line 4382 of file qgsexpression.cpp.

virtual bool QgsExpression::NodeBinaryOperator::needsGeometry ( ) const
inlineoverridevirtual

Abstract virtual method which returns if the geometry is required to evaluate this expression.

This needs to call needsGeometry() recursively on any child nodes.

Returns
true if a geometry is required to evaluate this expression

Implements QgsExpression::Node.

Definition at line 1014 of file qgsexpression.h.

virtual NodeType QgsExpression::NodeBinaryOperator::nodeType ( ) const
inlineoverridevirtual

Abstract virtual that returns the type of this node.

Returns
The type of this node

Implements QgsExpression::Node.

Definition at line 1008 of file qgsexpression.h.

BinaryOperator QgsExpression::NodeBinaryOperator::op ( ) const
inline

Definition at line 1004 of file qgsexpression.h.

Node* QgsExpression::NodeBinaryOperator::opLeft ( ) const
inline

Definition at line 1005 of file qgsexpression.h.

Node* QgsExpression::NodeBinaryOperator::opRight ( ) const
inline

Definition at line 1006 of file qgsexpression.h.

int QgsExpression::NodeBinaryOperator::precedence ( ) const

Definition at line 4336 of file qgsexpression.cpp.

bool QgsExpression::NodeBinaryOperator::prepare ( QgsExpression parent,
const QgsExpressionContext context 
)
overridevirtual

Abstract virtual preparation method Errors are reported to the parent.

Note
added in QGIS 2.12

Reimplemented from QgsExpression::Node.

Definition at line 4329 of file qgsexpression.cpp.

virtual QStringList QgsExpression::NodeBinaryOperator::referencedColumns ( ) const
inlineoverridevirtual

Abstract virtual method which returns a list of columns required to evaluate this node.

When reimplementing this, you need to return any column that is required to evaluate this node and in addition recursively collect all the columns required to evaluate child nodes.

Returns
A list of columns required to evaluate this expression

Implements QgsExpression::Node.

Definition at line 1013 of file qgsexpression.h.

Member Data Documentation

BinaryOperator QgsExpression::NodeBinaryOperator::mOp
protected

Definition at line 1032 of file qgsexpression.h.

Node* QgsExpression::NodeBinaryOperator::mOpLeft
protected

Definition at line 1033 of file qgsexpression.h.

Node* QgsExpression::NodeBinaryOperator::mOpRight
protected

Definition at line 1034 of file qgsexpression.h.


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