FilterElement QML Type

The OPC UA ContentFilterElement. More...

• List of all members, including inherited members

Properties

• firstOperand : variant
• operatorType : enumeration
• secondOperand : variant

Detailed Description

A content filter element contains an operator and 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.

QtOpcUa.FilterElement {
    operator: QtOpcUa.FilterElement.GreaterThanOrEqual
    firstOperand: QtOpcUa.SimpleAttributeOperand { ... }
    secondOperand: QtOpcUa.LiteralOperand { ... }
}

See also EventFilter.

Property Documentation

firstOperand : variant

First operand to be used with the operator. This can be one of SimpleAttributeOperand, AttributeOperand, LiteralOperand or ElementOperand.

operatorType : enumeration

The filter operator.

Possible operators for a FilterElement that are specified in OPC-UA part 4, Tables 115 and 116.

secondOperand : variant

Second operand to be used with the operator. This can be one of SimpleAttributeOperand, AttributeOperand, LiteralOperand or ElementOperand.