QOpcUaContentFilterElement Class

The OPC UA ContentFilterElement. 更多...

头：	#include <QOpcUaContentFilterElement>
qmake:	QT += opcua

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公共类型

enum	FilterOperator { Equals, IsNull, GreaterThan, LessThan, GreaterThanOrEqual, …, BitwiseOr }

公共函数

	QOpcUaContentFilterElement (const QOpcUaContentFilterElement & rhs )
QOpcUaContentFilterElement &	operator= (const QOpcUaContentFilterElement & rhs )
QList<QVariant>	filterOperands () const
QList<QVariant> &	filterOperandsRef ()
QOpcUaContentFilterElement::FilterOperator	filterOperator () const
void	setFilterOperands (const QList<QVariant> & filterOperands )
void	setFilterOperator (QOpcUaContentFilterElement::FilterOperator filterOperator )
QVariant	operator QVariant () const
QOpcUaContentFilterElement &	operator<< (QOpcUaContentFilterElement::FilterOperator op )
QOpcUaContentFilterElement &	operator<< (const QOpcUaSimpleAttributeOperand & op )
QOpcUaContentFilterElement &	operator<< (const QOpcUaAttributeOperand & op )
QOpcUaContentFilterElement &	operator<< (const QOpcUaLiteralOperand & op )
QOpcUaContentFilterElement &	operator<< (const QOpcUaElementOperand & op )
bool	operator== (const QOpcUaContentFilterElement & rhs ) const

详细描述

A content filter element contains an operator and a list of operands. There are four different operator types which contain literal values, references to attributes of nodes or to other content filter elements.

A combination of one or more content filter elements makes a content filter which is used by the server to filter data for the criteria defined by the content filter elements. For example, the where clause of an event filter is a content filter which is used to decide if a notification is generated for an event.

成员类型文档编制

enum QOpcUaContentFilterElement:: FilterOperator

FilterOperator enumerates all possible operators for a ContentFilterElement that are specified in OPC-UA part 4, Tables 115 and 116.

常量	值
`QOpcUaContentFilterElement::Equals`	`0`
`QOpcUaContentFilterElement::IsNull`	`1`
`QOpcUaContentFilterElement::GreaterThan`	`2`
`QOpcUaContentFilterElement::LessThan`	`3`
`QOpcUaContentFilterElement::GreaterThanOrEqual`	`4`
`QOpcUaContentFilterElement::LessThanOrEqual`	`5`
`QOpcUaContentFilterElement::Like`	`6`
`QOpcUaContentFilterElement::Not`	`7`
`QOpcUaContentFilterElement::Between`	`8`
`QOpcUaContentFilterElement::InList`	`9`
`QOpcUaContentFilterElement::And`	`10`
`QOpcUaContentFilterElement::Or`	`11`
`QOpcUaContentFilterElement::Cast`	`12`
`QOpcUaContentFilterElement::InView`	`13`
`QOpcUaContentFilterElement::OfType`	`14`
`QOpcUaContentFilterElement::RelatedTo`	`15`
`QOpcUaContentFilterElement::BitwiseAnd`	`16`
`QOpcUaContentFilterElement::BitwiseOr`	`17`

成员函数文档编制

QOpcUaContentFilterElement:: QOpcUaContentFilterElement (const QOpcUaContentFilterElement & rhs )

Constructs a content filter element from rhs .

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator= (const QOpcUaContentFilterElement & rhs )

设置值从 rhs in this content filter element.

QList < QVariant > QOpcUaContentFilterElement:: filterOperands () const

Returns the operands of the filter element.

另请参阅 setFilterOperands ().

QList < QVariant > &QOpcUaContentFilterElement:: filterOperandsRef ()

Returns a reference to the filter operands.

另请参阅 filterOperands ().

QOpcUaContentFilterElement::FilterOperator QOpcUaContentFilterElement:: filterOperator () const

Returns the filter operator.

另请参阅 setFilterOperator ().

void QOpcUaContentFilterElement:: setFilterOperands (const QList < QVariant > & filterOperands )

Sets the filter operands for this content filter element to filterOperands . Supported classes are QOpcUaElementOperand , QOpcUaLiteralOperand , QOpcUaSimpleAttributeOperand and QOpcUaAttributeOperand .

另请参阅 filterOperands ().

void QOpcUaContentFilterElement:: setFilterOperator ( QOpcUaContentFilterElement::FilterOperator filterOperator )

Sets the operator that is applied to the filter operands to filterOperator .

另请参阅 filterOperator ().

QVariant QOpcUaContentFilterElement:: operator QVariant () const

Converts this content filter element to QVariant .

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< ( QOpcUaContentFilterElement::FilterOperator op )

Sets filter operator op in this content filter element. If multiple operators are streamed into one content filter element, only the last operator is used. All others are discarded.

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< (const QOpcUaSimpleAttributeOperand & op )

Adds the simple attribute operand op to the operands list of this content filter element.

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< (const QOpcUaAttributeOperand & op )

Adds the attribute operand op to the operands list of this content filter element.

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< (const QOpcUaLiteralOperand & op )

Adds the literal operand op to the operands list of this content filter element.

QOpcUaContentFilterElement &QOpcUaContentFilterElement:: operator<< (const QOpcUaElementOperand & op )

Adds the element operand op to the operands list of this content filter element.

bool QOpcUaContentFilterElement:: operator== (const QOpcUaContentFilterElement & rhs ) const

返回 true if this content filter element has the same value as rhs .