Package com.inductiveautomation.perspective.gateway.driven

Class ExpressionDrivenStringValue

java.lang.Object

com.inductiveautomation.perspective.gateway.driven.LockGuardedDrivenValue<T>

com.inductiveautomation.perspective.gateway.driven.ExpressionDrivenValue<String>

com.inductiveautomation.perspective.gateway.driven.ExpressionDrivenStringValue

All Implemented Interfaces:

DrivenValue<String>

public class ExpressionDrivenStringValue
extends ExpressionDrivenValue<String>

An ExpressionDrivenStringValue is a ExpressionDrivenValue with type String. Calls to isValidValue(QualifiedValue) will always return true since the emitted expression values will be coerced to a String.

See Also:

• TypeUtilities.toString(Object)

Field Summary

Fields inherited from class com.inductiveautomation.perspective.gateway.driven.ExpressionDrivenValue

dirty, value

Fields inherited from class com.inductiveautomation.perspective.gateway.driven.LockGuardedDrivenValue

lock

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ExpressionDrivenStringValue(Object lock, PerspectiveExpression expr, Runnable valueChangedCallback)

Method Summary

Modifier and Type	Method	Description
protected Optional<String>	getAndClearInternal()	Called after asserting that the calling thread holds the injected lock.
protected boolean	isValidValue(QualifiedValue value)	This method is called when a new value is emitted from the expression.

Methods inherited from class com.inductiveautomation.perspective.gateway.driven.ExpressionDrivenValue

getAndClear, isDirtyInternal, isReadyInternal, resolveReferencesInternal, shutdown, startup

Methods inherited from class com.inductiveautomation.perspective.gateway.driven.LockGuardedDrivenValue

isDirty, isReady, resolveReferences

Methods inherited from class java.lang.Object

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

Constructor Details

ExpressionDrivenStringValue

protected ExpressionDrivenStringValue(@Nonnull
 Object lock,
 @Nonnull
 PerspectiveExpression expr,
 @Nonnull
 Runnable valueChangedCallback)

Method Details

isValidValue

protected boolean isValidValue(QualifiedValue value)

Description copied from class: ExpressionDrivenValue

This method is called when a new value is emitted from the expression. If the value passes validation, the value is set, dirty bits are set, and the callback is notified. If the value does not pass validation, nothing happens and a debug message is logged.

Specified by:

isValidValue in class ExpressionDrivenValue<String>

Parameters:

value - the latest value emitted from the expression

Returns:

true if the value passes validation, false otherwise

getAndClearInternal

@Nonnull
protected Optional<String> getAndClearInternal()

Description copied from class: LockGuardedDrivenValue

Called after asserting that the calling thread holds the injected lock.

Specified by:

getAndClearInternal in class LockGuardedDrivenValue<String>

See Also:

• LockGuardedDrivenValue.getAndClear()