com.sun.javafx.fxml.expression

Class ExpressionValue

java.lang.Object

javafx.beans.value.ObservableValueBase<Object>

com.sun.javafx.fxml.expression.ExpressionValue

All Implemented Interfaces:

Observable, ObservableValue<Object>

public class ExpressionValue
extends ObservableValueBase<Object>

Class representing an observable expression value.

Constructor Summary

Constructors

Constructor and Description
ExpressionValue(Object namespace, Expression expression, Class<?> type)

Method Summary

Modifier and Type	Method and Description
void	addListener(ChangeListener<? super Object> listener) Adds a ChangeListener which will be notified whenever the value of the ObservableValue changes.
void	addListener(InvalidationListener listener) Adds an InvalidationListener which will be notified whenever the Observable becomes invalid.
Object	getValue() Returns the current value of this ObservableValue
void	removeListener(ChangeListener<? super Object> listener) Removes the given listener from the list of listeners, that are notified whenever the value of the ObservableValue changes.
void	removeListener(InvalidationListener listener) Removes the given listener from the list of listeners, that are notified whenever the value of the Observable becomes invalid.

Methods inherited from class javafx.beans.value.ObservableValueBase

fireValueChangedEvent

Methods inherited from class java.lang.Object

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

Constructor Detail

ExpressionValue

public ExpressionValue(Object namespace,
                       Expression expression,
                       Class<?> type)

Method Detail

getValue

public Object getValue()

Description copied from interface: ObservableValue

Returns the current value of this ObservableValue

Returns:

The current value

addListener

public void addListener(InvalidationListener listener)

Description copied from class: ObservableValueBase

Adds an InvalidationListener which will be notified whenever the Observable becomes invalid. If the same listener is added more than once, then it will be notified more than once. That is, no check is made to ensure uniqueness.

Note that the same actual InvalidationListener instance may be safely registered for different Observables.

The Observable stores a strong reference to the listener which will prevent the listener from being garbage collected and may result in a memory leak. It is recommended to either unregister a listener by calling removeListener after use or to use an instance of WeakInvalidationListener avoid this situation.

Specified by:

addListener in interface Observable

Overrides:

addListener in class ObservableValueBase<Object>

Parameters:

listener - The listener to register

See Also:

Observable.removeListener(InvalidationListener)

removeListener

public void removeListener(InvalidationListener listener)

Description copied from class: ObservableValueBase

Removes the given listener from the list of listeners, that are notified whenever the value of the Observable becomes invalid.

If the given listener has not been previously registered (i.e. it was never added) then this method call is a no-op. If it had been previously added then it will be removed. If it had been added more than once, then only the first occurrence will be removed.

Specified by:

removeListener in interface Observable

Overrides:

removeListener in class ObservableValueBase<Object>

Parameters:

listener - The listener to remove

See Also:

Observable.addListener(InvalidationListener)

addListener

public void addListener(ChangeListener<? super Object> listener)

Description copied from class: ObservableValueBase

Adds a ChangeListener which will be notified whenever the value of the ObservableValue changes. If the same listener is added more than once, then it will be notified more than once. That is, no check is made to ensure uniqueness.

Note that the same actual ChangeListener instance may be safely registered for different ObservableValues.

The ObservableValue stores a strong reference to the listener which will prevent the listener from being garbage collected and may result in a memory leak. It is recommended to either unregister a listener by calling removeListener after use or to use an instance of WeakChangeListener avoid this situation.

Specified by:

addListener in interface ObservableValue<Object>

Overrides:

addListener in class ObservableValueBase<Object>

Parameters:

listener - The listener to register

See Also:

ObservableValue.removeListener(ChangeListener)

removeListener

public void removeListener(ChangeListener<? super Object> listener)

Description copied from class: ObservableValueBase

Removes the given listener from the list of listeners, that are notified whenever the value of the ObservableValue changes.

If the given listener has not been previously registered (i.e. it was never added) then this method call is a no-op. If it had been previously added then it will be removed. If it had been added more than once, then only the first occurrence will be removed.

Specified by:

removeListener in interface ObservableValue<Object>

Overrides:

removeListener in class ObservableValueBase<Object>

Parameters:

listener - The listener to remove

See Also:

ObservableValue.addListener(ChangeListener)