Package com.inductiveautomation.ignition.gateway.expressions

Class TagReferenceBinder.TagReadExpression

java.lang.Object

com.inductiveautomation.ignition.common.expressions.AbstractExpression

com.inductiveautomation.ignition.gateway.expressions.TagReferenceBinder.TagReadExpression

All Implemented Interfaces:

Expression

Enclosing class:

TagReferenceBinder

protected static class TagReferenceBinder.TagReadExpression
extends AbstractExpression

Field Summary

Fields inherited from class com.inductiveautomation.ignition.common.expressions.AbstractExpression

children, context, updateListener

Constructor Summary

Constructors

Constructor	Description
TagReadExpression(TagPath path, boolean isSelfReference)

Method Summary

Modifier and Type	Method	Description
void	connect(CommonContext context, InteractionListener updateListener)	Gives the expression a chance to connect itself to things, if necessary.
QualifiedValue	execute()	Compute and return the value of this expression
String	getOpName()	Return a human-readable name for the operation that this expression performs

Methods inherited from class com.inductiveautomation.ignition.common.expressions.AbstractExpression

disconnect, getChildren, setChildren, shutdown, startup

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.inductiveautomation.ignition.common.expressions.Expression

getType

Constructor Details

TagReadExpression

public TagReadExpression(TagPath path,
 boolean isSelfReference)

Method Details

connect

public void connect(CommonContext context,
 InteractionListener updateListener)

Description copied from interface: Expression

Gives the expression a chance to connect itself to things, if necessary. Most expressions do not have any connections. An expression should notify the updateListener if they change.

Specified by:

connect in interface Expression

Overrides:

connect in class AbstractExpression

execute

@Nonnull
public QualifiedValue execute()
                       throws ExpressionException

Description copied from interface: Expression

Compute and return the value of this expression

Throws:

ExpressionException

getOpName

public String getOpName()

Description copied from interface: Expression

Return a human-readable name for the operation that this expression performs