Package com.inductiveautomation.ignition.gateway.expressions

Class PropertyBasedExpressionParseContext.PropertyReferenceExpression

java.lang.Object

com.inductiveautomation.ignition.common.expressions.AbstractExpression

com.inductiveautomation.ignition.gateway.expressions.PropertyBasedExpressionParseContext.PropertyReferenceExpression

All Implemented Interfaces:

ObservablePropertySource.PropertyInteractionListener, Expression

Enclosing class:

PropertyBasedExpressionParseContext

protected class PropertyBasedExpressionParseContext.PropertyReferenceExpression
extends AbstractExpression
implements ObservablePropertySource.PropertyInteractionListener

Field Summary

Fields

Modifier and Type	Field	Description
protected Property<?>	prop

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

children, context, updateListener

Constructor Summary

Constructors

Constructor	Description
PropertyReferenceExpression(Property<?> prop, boolean allowSubscription)

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.
void	disconnect()	Tells the expression to disconnect from anything it was connected to.
QualifiedValue	execute()	Compute and return the value of this expression
String	getOpName()	Return a human-readable name for the operation that this expression performs
Class<?>	getType()	Return the type that this expression will return
void	propertyChanged(Property<?> prop)

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

getChildren, setChildren, shutdown, startup

Methods inherited from class java.lang.Object

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

Field Details

prop

protected Property<?> prop

Constructor Details

PropertyReferenceExpression

public PropertyReferenceExpression(Property<?> prop,
 boolean allowSubscription)

Method Details

execute

@Nonnull
public QualifiedValue execute()
                       throws ExpressionException

Description copied from interface: Expression

Compute and return the value of this expression

Specified by:

execute in interface Expression

Throws:

ExpressionException

getType

public Class<?> getType()

Description copied from interface: Expression

Return the type that this expression will return

Specified by:

getType in interface Expression

getOpName

public String getOpName()

Description copied from interface: Expression

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

Specified by:

getOpName in interface Expression

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

disconnect

public void disconnect()

Description copied from interface: Expression

Tells the expression to disconnect from anything it was connected to.

Specified by:

disconnect in interface Expression

Overrides:

disconnect in class AbstractExpression

propertyChanged

public void propertyChanged(Property<?> prop)

Specified by:

propertyChanged in interface ObservablePropertySource.PropertyInteractionListener