class QOpcUaContentFilterElement

The OPC UA ContentFilterElement. More…

Synopsis

Methods

Note

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Detailed Description

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.

class FilterOperator

FilterOperator enumerates all possible operators for a ContentFilterElement that are specified in OPC UA 1.05 part 4, 7.7.3.

Constant

Description

QOpcUaContentFilterElement.Equals

QOpcUaContentFilterElement.IsNull

QOpcUaContentFilterElement.GreaterThan

QOpcUaContentFilterElement.LessThan

QOpcUaContentFilterElement.GreaterThanOrEqual

QOpcUaContentFilterElement.LessThanOrEqual

QOpcUaContentFilterElement.Like

QOpcUaContentFilterElement.Not

QOpcUaContentFilterElement.Between

QOpcUaContentFilterElement.InList

QOpcUaContentFilterElement.And

QOpcUaContentFilterElement.Or

QOpcUaContentFilterElement.Cast

QOpcUaContentFilterElement.InView

QOpcUaContentFilterElement.OfType

QOpcUaContentFilterElement.RelatedTo

QOpcUaContentFilterElement.BitwiseAnd

QOpcUaContentFilterElement.BitwiseOr
__init__()

Default constructs a content filter element with no parameters set.

__init__(arg__1)
Parameters:

arg__1 – QOpcUaContentFilterElement

Constructs a content filter element from rhs.

filterOperands()
Return type:

.list of QVariant

Returns the operands of the filter element.

filterOperandsRef()
Return type:

.list of QVariant

Returns a reference to the filter operands.

See also

filterOperands()

filterOperator()
Return type:

FilterOperator

Returns the filter operator.

__ne__(rhs)
Parameters:

rhs – QOpcUaContentFilterElement

Return type:

bool

Returns true if lhs has a different value than rhs.

__lshift__(op)
Parameters:

op – FilterOperator

Return type:

QOpcUaContentFilterElement

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.

__lshift__(op)
Parameters:

op – QOpcUaAttributeOperand

Return type:

QOpcUaContentFilterElement

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

__lshift__(op)
Parameters:

op – QOpcUaElementOperand

Return type:

QOpcUaContentFilterElement

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

__lshift__(op)
Parameters:

op – QOpcUaLiteralOperand

Return type:

QOpcUaContentFilterElement

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

__lshift__(op)
Parameters:

op – QOpcUaSimpleAttributeOperand

Return type:

QOpcUaContentFilterElement

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

__eq__(rhs)
Parameters:

rhs – QOpcUaContentFilterElement

Return type:

bool

Returns true if lhs has the same value as rhs.

setFilterOperands(filterOperands)
Parameters:

filterOperands – .list of QVariant

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

See also

filterOperands()

setFilterOperator(filterOperator)
Parameters:

filterOperator – FilterOperator

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

See also

filterOperator()