Package com.inductiveautomation.ignition.common.expressions

Class BoundPropertyExpression

java.lang.Object

com.inductiveautomation.ignition.common.expressions.AbstractExpression

com.inductiveautomation.ignition.common.expressions.BoundPropertyExpression

All Implemented Interfaces:

ObservablePropertySource.PropertyInteractionListener, Expression

public class BoundPropertyExpression
extends AbstractExpression
implements ObservablePropertySource.PropertyInteractionListener

This is an expression that is bound to a property value in a given PropertyValueSource.

Field Summary

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

children, context, updateListener

Constructor Summary

Constructors

Constructor	Description
BoundPropertyExpression(PropertyValueSource source, Property<?> target)

Method Summary

Modifier and Type	Method	Description
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)
void	shutdown()	Tells the expression to shutdown any polling operations.
void	startup()	Tells the expression to startup any polling operations.

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

connect, disconnect, getChildren, setChildren

Methods inherited from class java.lang.Object

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

Constructor Details

BoundPropertyExpression

public BoundPropertyExpression(PropertyValueSource source,
 Property<?> target)

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

startup

public void startup()

Description copied from interface: Expression

Tells the expression to startup any polling operations. Expressions that use this can remember the updateListener from connect() to feed update notification to.

Specified by:

startup in interface Expression

Overrides:

startup in class AbstractExpression

shutdown

public void shutdown()

Description copied from interface: Expression

Tells the expression to shutdown any polling operations.

Specified by:

shutdown in interface Expression

Overrides:

shutdown in class AbstractExpression

propertyChanged

public void propertyChanged(Property<?> prop)

Specified by:

propertyChanged in interface ObservablePropertySource.PropertyInteractionListener