Module javafx.base

Package javafx.collections

Class ObservableArrayBase<T extends ObservableArray<T>>

java.lang.Object

javafx.collections.ObservableArrayBase<T>

Type Parameters:

T - actual array instance type

All Implemented Interfaces:

Observable, ObservableArray<T>

public abstract class ObservableArrayBase<T extends ObservableArray<T>>
extends Object
implements ObservableArray<T>

Abstract class that serves as a base class for ObservableArray implementations. The base class provides listener handling functionality by implementing addListener and removeListener methods. fireChange(boolean, int, int) method is provided for notifying the listeners.

Since:

JavaFX 8.0

See Also:

• ObservableArray
• ArrayChangeListener

Constructor Summary

Constructors

Constructor	Description
ObservableArrayBase()	Creates a default ObservableArrayBase.

Method Summary

Modifier and Type	Method	Description
final void	addListener(InvalidationListener listener)	Adds an InvalidationListener which will be notified whenever the Observable becomes invalid.
final void	addListener(ArrayChangeListener<T> listener)	Add a listener to this observable array.
protected final void	fireChange(boolean sizeChanged, int from, int to)	Notifies all listeners of a change
final void	removeListener(InvalidationListener listener)	Removes the given listener from the list of listeners, that are notified whenever the value of the Observable becomes invalid.
final void	removeListener(ArrayChangeListener<T> listener)	Tries to remove a listener from this observable array.

Methods declared in class java.lang.Object

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

Methods declared in interface javafx.collections.ObservableArray

clear, ensureCapacity, resize, size, trimToSize

Constructor Details

ObservableArrayBase

public ObservableArrayBase()

Creates a default ObservableArrayBase.

Method Details

addListener

public final 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.

Specified by:

addListener in interface Observable

Parameters:

listener - The listener to register

See Also:

• Observable.removeListener(InvalidationListener)

removeListener

public final 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.

Specified by:

removeListener in interface Observable

Parameters:

listener - The listener to remove

See Also:

• Observable.addListener(InvalidationListener)

addListener

public final void addListener(ArrayChangeListener<T> listener)

Description copied from interface: ObservableArray

Add a listener to this observable array.

Specified by:

addListener in interface ObservableArray<T extends ObservableArray<T>>

Parameters:

listener - the listener for listening to the array changes

removeListener

public final void removeListener(ArrayChangeListener<T> listener)

Description copied from interface: ObservableArray

Tries to remove a listener from this observable array. If the listener is not attached to this array, nothing happens.

Specified by:

removeListener in interface ObservableArray<T extends ObservableArray<T>>

Parameters:

listener - a listener to remove

fireChange

protected final void fireChange(boolean sizeChanged,
 int from,
 int to)

Notifies all listeners of a change

Parameters:

sizeChanged - indicates size of array changed

from - A beginning (inclusive) of an interval related to the change

to - An end (exclusive) of an interval related to the change.