org.eclipse.scada.da.server.common

Class DataItemOutput

java.lang.Object

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

org.eclipse.scada.da.server.common.DataItemOutput

All Implemented Interfaces:

DataItem

Direct Known Subclasses:

DataItemCommand, MemoryCellItem, TestItem1, WriteDelayItem

public abstract class DataItemOutput
extends DataItemBase

Field Summary

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

listener

Constructor Summary

Constructors

Constructor and Description
DataItemOutput(String id)

Method Summary

Modifier and Type	Method and Description
NotifyFuture<Variant>	readValue() The read operation of a data item.

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

getCacheAttributes, getCacheValue, getInformation, handleListenerChange, notifyData, notifyData, setListener

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.eclipse.scada.da.server.common.DataItem

getAttributes, startSetAttributes, startWriteValue

Constructor Detail

DataItemOutput

public DataItemOutput(String id)

Method Detail

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