Module javafx.base

Package javafx.beans.property

Class ObjectPropertyBase<T>

java.lang.Object

javafx.beans.binding.ObjectExpression<T>

javafx.beans.property.ReadOnlyObjectProperty<T>

javafx.beans.property.ObjectProperty<T>

javafx.beans.property.ObjectPropertyBase<T>

Type Parameters:

T - the type of the wrapped value

All Implemented Interfaces:

Observable, Property<T>, ReadOnlyProperty<T>, ObservableObjectValue<T>, ObservableValue<T>, WritableObjectValue<T>, WritableValue<T>

Direct Known Subclasses:

SimpleObjectProperty, StyleableObjectProperty

public abstract class ObjectPropertyBase<T>
extends ObjectProperty<T>

The class ObjectPropertyBase is the base class for a property wrapping an arbitrary Object. It provides all the functionality required for a property except for the ReadOnlyProperty.getBean() and ReadOnlyProperty.getName() methods, which must be implemented by extending classes.

Since:

JavaFX 2.0

See Also:

ObjectProperty

Constructor Summary

Constructors

Constructor	Description
ObjectPropertyBase()	The constructor of the ObjectPropertyBase.
ObjectPropertyBase(T initialValue)	The constructor of the ObjectPropertyBase.

Method Summary

Modifier and Type	Method	Description
void	addListener(InvalidationListener listener)	Adds an InvalidationListener which will be notified whenever the Observable becomes invalid.
void	addListener(ChangeListener<? super T> listener)	Adds a ChangeListener which will be notified whenever the value of the ObservableValue changes.
void	bind(ObservableValue<? extends T> newObservable)	Create a unidirection binding for this Property.
protected void	fireValueChangedEvent()	Sends notifications to all attached InvalidationListeners and ChangeListeners.
T	get()	Get the wrapped value.
protected void	invalidated()	The method invalidated() can be overridden to receive invalidation notifications.
boolean	isBound()	Can be used to check, if a Property is bound.
void	removeListener(InvalidationListener listener)	Removes the given listener from the list of listeners, that are notified whenever the value of the Observable becomes invalid.
void	removeListener(ChangeListener<? super T> listener)	Removes the given listener from the list of listeners that are notified whenever the value of the ObservableValue changes.
void	set(T newValue)	Set the wrapped value.
String	toString()	Returns a string representation of this ObjectPropertyBase object.
void	unbind()	Remove the unidirectional binding for this Property.

Methods inherited from class javafx.beans.property.ObjectProperty

bindBidirectional, setValue, unbindBidirectional

Methods inherited from class javafx.beans.binding.ObjectExpression

asString, asString, asString, getValue, isEqualTo, isEqualTo, isNotEqualTo, isNotEqualTo, isNotNull, isNull, objectExpression

Methods inherited from class java.lang.Object

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

Methods inherited from interface javafx.beans.value.ObservableValue

getValue

Methods inherited from interface javafx.beans.property.ReadOnlyProperty

getBean, getName

Methods inherited from interface javafx.beans.value.WritableValue

getValue

Constructor Detail

ObjectPropertyBase

public ObjectPropertyBase()

The constructor of the ObjectPropertyBase.

ObjectPropertyBase

public ObjectPropertyBase(T initialValue)

The constructor of the ObjectPropertyBase.

Parameters:

initialValue - the initial value of the wrapped Object

Method Detail

addListener

public void addListener(InvalidationListener listener)

Description copied from interface: Observable

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.

Parameters:

listener - The listener to register

See Also:

Observable.removeListener(InvalidationListener)

removeListener

public void removeListener(InvalidationListener listener)

Description copied from interface: Observable

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.

Parameters:

listener - The listener to remove

See Also:

Observable.addListener(InvalidationListener)

addListener

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

Description copied from interface: ObservableValue

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.

Parameters:

listener - The listener to register

See Also:

ObservableValue.removeListener(ChangeListener)

removeListener

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

Description copied from interface: ObservableValue

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.

Parameters:

listener - The listener to remove

See Also:

ObservableValue.addListener(ChangeListener)

fireValueChangedEvent

protected void fireValueChangedEvent()

Sends notifications to all attached InvalidationListeners and ChangeListeners. This method is called when the value is changed, either manually by calling set(T) or in case of a bound property, if the binding becomes invalid.

invalidated

protected void invalidated()

The method invalidated() can be overridden to receive invalidation notifications. This is the preferred option in Objects defining the property, because it requires less memory. The default implementation is empty.

get

public T get()

Get the wrapped value. This must be identical to the value returned from WritableValue.getValue().

This method exists only to align WritableObjectValue API with WritableBooleanValue and subclasses of WritableNumberValue

Returns:

The current value

set

public void set(T newValue)

Set the wrapped value. Should be equivalent to WritableValue.setValue(java.lang.Object)

Parameters:

newValue - The new value

See Also:

WritableObjectValue.get()

isBound

public boolean isBound()

Can be used to check, if a Property is bound.

Returns:

true if the Property is bound, false otherwise

See Also:

Property.bind(javafx.beans.value.ObservableValue)

bind

public void bind(ObservableValue<? extends T> newObservable)

Create a unidirection binding for this Property.

Note that JavaFX has all the bind calls implemented through weak listeners. This means the bound property can be garbage collected and stopped from being updated.

Parameters:

newObservable - The observable this Property should be bound to.

unbind

public void unbind()

Remove the unidirectional binding for this Property. If the Property is not bound, calling this method has no effect.

See Also:

Property.bind(javafx.beans.value.ObservableValue)

toString

public String toString()

Returns a string representation of this ObjectPropertyBase object.

Overrides:

toString in class ObjectProperty<T>

Returns:

a string representation of this ObjectPropertyBase object.