DataChangeFilter Class

class QOpcUaMonitoringParameters::DataChangeFilter

Defines a DataChangeFilter for a monitored item. More...

List of all members, including inherited members

Public Types

enum class	DataChangeTrigger { Status, StatusOrValue, StatusOrValueOrTimestamp }
enum class	DeadbandType { None, Absolute, Percent }

Public Functions

	DataChangeFilter()
	DataChangeFilter(const DataChangeFilter &rhs)
	DataChangeFilter(DataChangeFilter::DataChangeTrigger trigger, DataChangeFilter::DeadbandType deadbandType, double deadbandValue)
DataChangeFilter::DeadbandType	deadbandType() const
double	deadbandValue() const
void	setDeadbandType(DataChangeFilter::DeadbandType deadbandType)
void	setDeadbandValue(double deadbandValue)
void	setTrigger(DataChangeFilter::DataChangeTrigger trigger)
DataChangeFilter::DataChangeTrigger	trigger() const
QVariant	operator QVariant() const
DataChangeFilter &	operator=(const DataChangeFilter &rhs)
bool	operator==(const DataChangeFilter &rhs) const

Detailed Description

This class is used to set up filtering for a DataChange monitored item. It is defined in OPC-UA part 4, 7.12.2.

Member Type Documentation

enum class DataChangeFilter::DataChangeTrigger

Enumerates the possible triggers for a DataChangeFilter.

Constant	Value	Description
`QOpcUaMonitoringParameters::DataChangeFilter::DataChangeTrigger::Status`	`0`	Triggers if the value's status code changes.
`QOpcUaMonitoringParameters::DataChangeFilter::DataChangeTrigger::StatusOrValue`	`1`	Triggers if the value's status code or the value itself changes.
`QOpcUaMonitoringParameters::DataChangeFilter::DataChangeTrigger::StatusOrValueOrTimestamp`	`2`	Triggers if the value's status code, the value itself or the source timestamp changes.

enum class DataChangeFilter::DeadbandType

Enumerates the possible deadband types for a DataChangeFilter.

Constant	Value	Description
`QOpcUaMonitoringParameters::DataChangeFilter::DeadbandType::None`	`0`	No deadband filtering.
`QOpcUaMonitoringParameters::DataChangeFilter::DeadbandType::Absolute`	`1`	A notification is generated if the absolute value of the difference between the last cached value and the current value is greater than the deadband value.
`QOpcUaMonitoringParameters::DataChangeFilter::DeadbandType::Percent`	`2`	Only valid for AnalogItems with an EURange property. A notification is generated if the absolute value of the difference between the last cached value and the current value is greater than value percent of the EURange.

Member Function Documentation

DataChangeFilter::DataChangeFilter()

Constructs a data change filter with trigger on status, deadband type none and deadbandValue 0.

DataChangeFilter::DataChangeFilter(const DataChangeFilter &rhs)

Constructs a data change filter from rhs.

DataChangeFilter::DataChangeFilter(DataChangeFilter::DataChangeTrigger trigger, DataChangeFilter::DeadbandType deadbandType, double deadbandValue)

Constructs a data change filter with trigger trigger, deadband type deadbandType and deadband value deadbandValue.

DataChangeFilter::DeadbandType DataChangeFilter::deadbandType() const

Returns the deadband type.

See also setDeadbandType().

double DataChangeFilter::deadbandValue() const

Returns the deadband value.

See also setDeadbandValue().

void DataChangeFilter::setDeadbandType(DataChangeFilter::DeadbandType deadbandType)

Sets the deadband type to deadbandType.

See also deadbandType().

void DataChangeFilter::setDeadbandValue(double deadbandValue)

Sets the deadband value to deadbandValue.

See also deadbandValue().

void DataChangeFilter::setTrigger(DataChangeFilter::DataChangeTrigger trigger)

Sets the trigger to trigger.

See also trigger().

DataChangeFilter::DataChangeTrigger DataChangeFilter::trigger() const

Returns the trigger.

See also setTrigger().

QVariant DataChangeFilter::operator QVariant() const

Converts this data change filter to QVariant.

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

Sets the values from rhs in this data change filter.

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

Returns true if this data change filter has the same value as rhs.

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