The OPC UA ContentFilterElement. More...
| Header: | #include <QOpcUaContentFilterElement> |
| CMake: | find_package(Qt6 REQUIRED COMPONENTS OpcUa) target_link_libraries(mytarget PRIVATE Qt6::OpcUa) |
| qmake: | QT += opcua |
| enum | FilterOperator { Equals, IsNull, GreaterThan, LessThan, GreaterThanOrEqual, …, BitwiseOr } |
| 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 |
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.
FilterOperator enumerates all possible operators for a ContentFilterElement that are specified in OPC-UA part 4, Tables 115 and 116.
| Constant | Value |
|---|---|
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 |
Constructs a content filter element from rhs.
Sets the values from rhs in this content filter element.
Returns the operands of the filter element.
See also setFilterOperands().
Returns a reference to the filter operands.
See also filterOperands().
Returns the filter operator.
See also setFilterOperator().
Sets the filter operands for this content filter element to filterOperands. Supported classes are QOpcUaElementOperand, QOpcUaLiteralOperand, QOpcUaSimpleAttributeOperand and QOpcUaAttributeOperand.
See also filterOperands().
Sets the operator that is applied to the filter operands to filterOperator.
See also filterOperator().
Converts this content filter element to QVariant.
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.
Adds the simple attribute operand op to the operands list of this content filter element.
Adds the attribute operand op to the operands list of this content filter element.
Adds the literal operand op to the operands list of this content filter element.
Adds the element operand op to the operands list of this content filter element.
Returns true if this content filter element has the same value as rhs.
