QOpcUaContentFilterElement Class
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 |
Public Types
| enum | FilterOperator { Equals, IsNull, GreaterThan, LessThan, GreaterThanOrEqual, …, BitwiseOr } |
Public Functions
| QOpcUaContentFilterElement() | |
| QOpcUaContentFilterElement(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 QOpcUaAttributeOperand &op) |
| QOpcUaContentFilterElement & | operator<<(const QOpcUaElementOperand &op) |
| QOpcUaContentFilterElement & | operator<<(const QOpcUaLiteralOperand &op) |
| QOpcUaContentFilterElement & | operator<<(const QOpcUaSimpleAttributeOperand &op) |
| QOpcUaContentFilterElement & | operator=(const QOpcUaContentFilterElement &rhs) |
Related Non-Members
(since 6.7) bool | operator!=(const QOpcUaContentFilterElement &lhs, const QOpcUaContentFilterElement &rhs) |
| bool | operator==(const QOpcUaContentFilterElement &lhs, const QOpcUaContentFilterElement &rhs) |
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.
Member Type Documentation
enum QOpcUaContentFilterElement::FilterOperator
FilterOperator enumerates all possible operators for a ContentFilterElement that are specified in OPC UA 1.05 part 4, 7.7.3.
| 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 |
Member Function Documentation
QOpcUaContentFilterElement::QOpcUaContentFilterElement()
Default constructs a content filter element with no parameters set.
QOpcUaContentFilterElement::QOpcUaContentFilterElement(const QOpcUaContentFilterElement &rhs)
Constructs a content filter element from rhs.
QList<QVariant> QOpcUaContentFilterElement::filterOperands() const
Returns the operands of the filter element.
See also setFilterOperands().
QList<QVariant> &QOpcUaContentFilterElement::filterOperandsRef()
Returns a reference to the filter operands.
See also filterOperands().
QOpcUaContentFilterElement::FilterOperator QOpcUaContentFilterElement::filterOperator() const
Returns the filter operator.
See also 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.
See also filterOperands().
void QOpcUaContentFilterElement::setFilterOperator(QOpcUaContentFilterElement::FilterOperator filterOperator)
Sets the operator that is applied to the filter operands to filterOperator.
See also 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 QOpcUaAttributeOperand &op)
Adds the attribute 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.
QOpcUaContentFilterElement &QOpcUaContentFilterElement::operator<<(const QOpcUaLiteralOperand &op)
Adds the literal operand op to the operands list of this content filter element.
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 QOpcUaContentFilterElement &rhs)
Sets the values from rhs in this content filter element.
Related Non-Members
[noexcept, since 6.7] bool operator!=(const QOpcUaContentFilterElement &lhs, const QOpcUaContentFilterElement &rhs)
Returns true if lhs has a different value than rhs.
This function was introduced in Qt 6.7.
[noexcept] bool operator==(const QOpcUaContentFilterElement &lhs, const QOpcUaContentFilterElement &rhs)
Returns true if lhs has the same value as rhs.