org.eclipse.scada.da.server.common.chain

Class DataItemInputChained

java.lang.Object

org.eclipse.scada.da.server.common.DataItemBase

org.eclipse.scada.da.server.common.chain.DataItemBaseChained

org.eclipse.scada.da.server.common.chain.DataItemInputChained

All Implemented Interfaces:

DataItem

Direct Known Subclasses:

AttributeWriteHandlerItem, DataItemInputOutputChained, DataItemTest1, TimeDataItem

public class DataItemInputChained
extends DataItemBaseChained

Field Summary

Fields

Modifier and Type	Field and Description
protected Variant	primaryValue
protected Variant	secondaryValue

Fields inherited from class org.eclipse.scada.da.server.common.chain.DataItemBaseChained

chain, executor, primaryAttributes, secondaryAttributes

Fields inherited from class org.eclipse.scada.da.server.common.DataItemBase

listener

Constructor Summary

Constructors

Constructor and Description
DataItemInputChained(DataItemInformation dataItemInformation, boolean autoTimestamp, Executor executor)
DataItemInputChained(DataItemInformation dataItemInformation, Executor executor)
DataItemInputChained(String id, Executor executor)

Method Summary

Modifier and Type	Method and Description
protected Map<String,Variant>	getCacheAttributes()
protected Variant	getCacheValue()
protected void	process()
NotifyFuture<Variant>	readValue() The read operation of a data item.
NotifyFuture<WriteResult>	startWriteValue(Variant value, OperationParameters operationParameters) The write operation of a data item.
void	updateData(Variant value, Map<String,Variant> attributes, AttributeMode mode) Update the item data

Methods inherited from class org.eclipse.scada.da.server.common.chain.DataItemBaseChained

addChainElement, addChainElement, getAttributes, getChainCopy, handleUnhandledAttributes, processSetAttributes, removeChainElement, setChain, startSetAttributes

Methods inherited from class org.eclipse.scada.da.server.common.DataItemBase

getInformation, handleListenerChange, notifyData, notifyData, setListener

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

primaryValue

protected Variant primaryValue

secondaryValue

protected Variant secondaryValue

Constructor Detail

DataItemInputChained

public DataItemInputChained(DataItemInformation dataItemInformation,
                            Executor executor)

DataItemInputChained

public DataItemInputChained(DataItemInformation dataItemInformation,
                            boolean autoTimestamp,
                            Executor executor)

DataItemInputChained

public DataItemInputChained(String id,
                            Executor executor)

Method Detail

updateData

public void updateData(Variant value,
                       Map<String,Variant> attributes,
                       AttributeMode mode)

Update the item data

Parameters:

value - the new value, or null if the value did not change

attributes - the new attributes, null if no attribute have changed

mode - The attribute change mode, null will use the default ( AttributeMode.UPDATE )

process

protected void process()

Specified by:

process in class DataItemBaseChained

readValue

public NotifyFuture<Variant> readValue()
                                throws InvalidOperationException

Description copied from interface: DataItem

The read operation of a data item.

Returns:

The value read from the subsystem.

Throws:

InvalidOperationException - Raised if "read" is not a valid operation for this item

startWriteValue

public NotifyFuture<WriteResult> startWriteValue(Variant value,
                                                 OperationParameters operationParameters)

Description copied from interface: DataItem

The write operation of a data item.

Parameters:

value - The value to write to the subsystem

Returns:

the future to the operation

getCacheAttributes

protected Map<String,Variant> getCacheAttributes()

Overrides:

getCacheAttributes in class DataItemBase

getCacheValue

protected Variant getCacheValue()

Overrides:

getCacheValue in class DataItemBase