Module javafx.base

Package javafx.beans.binding

Class SetBinding<E>

java.lang.Object

javafx.beans.binding.SetExpression<E>

javafx.beans.binding.SetBinding<E>

Type Parameters:

E - the type of the Set elements

All Implemented Interfaces:

Iterable<E>, Collection<E>, Set<E>, Binding<ObservableSet<E>>, Observable, ObservableObjectValue<ObservableSet<E>>, ObservableSetValue<E>, ObservableValue<ObservableSet<E>>, ObservableSet<E>

public abstract class SetBinding<E>
extends SetExpression<E>
implements Binding<ObservableSet<E>>

Base class that provides most of the functionality needed to implement a Binding of an ObservableSet.

SetBinding provides a simple invalidation-scheme. An extending class can register dependencies by calling bind(Observable...). If one of the registered dependencies becomes invalid, this SetBinding is marked as invalid. With unbind(Observable...) listening to dependencies can be stopped.

To provide a concrete implementation of this class, the method computeValue() has to be implemented to calculate the value of this binding based on the current state of the dependencies. It is called when get() is called for an invalid binding.

See DoubleBinding for an example how this base class can be extended.

Since:

JavaFX 2.1

See Also:

Binding, SetExpression

Property Summary

Properties

Type	Property	Description
ReadOnlyBooleanProperty	empty	A boolean property that is true, if the set is empty.
ReadOnlyIntegerProperty	size	An integer property that represents the size of the set.

Properties declared in class javafx.beans.binding.SetExpression

empty, size

Constructor Summary

Constructors

Constructor	Description
SetBinding()

Method Summary

Modifier and Type	Method	Description
protected void	bind(Observable... dependencies)	Start observing the dependencies for changes.
protected abstract ObservableSet<E>	computeValue()	Calculates the current value of this binding.
void	dispose()	A default implementation of dispose() that is empty.
ObservableSet<E>	get()	Returns the result of computeValue().
ObservableList<?>	getDependencies()	A default implementation of getDependencies() that returns an empty ObservableList.
protected void	onInvalidating()	The method onInvalidating() can be overridden by extending classes to react, if this binding becomes invalid.
String	toString()	Returns a string representation of this SetBinding object.
protected void	unbind(Observable... dependencies)	Stop observing the dependencies for changes.

Methods declared in interface javafx.beans.binding.Binding

invalidate, isValid

Methods declared in interface java.util.Collection

parallelStream, removeIf, stream

Methods declared in interface java.lang.Iterable

forEach

Methods declared in class java.lang.Object

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

Methods declared in interface javafx.beans.Observable

addListener, removeListener

Methods declared in interface javafx.collections.ObservableSet

addListener, removeListener

Methods declared in interface javafx.beans.value.ObservableValue

addListener, getValue, removeListener

Methods declared in interface java.util.Set

add, addAll, clear, contains, containsAll, equals, hashCode, isEmpty, iterator, remove, removeAll, retainAll, size, spliterator, toArray, toArray

Methods declared in class javafx.beans.binding.SetExpression

asString, emptyProperty, getSize, isEqualTo, isNotEqualTo, isNotNull, isNull, setExpression, sizeProperty

Property Detail

size

public ReadOnlyIntegerProperty sizeProperty

Specified by:

sizeProperty in class SetExpression<E>

See Also:

SetExpression.getSize()

empty

public ReadOnlyBooleanProperty emptyProperty

Specified by:

emptyProperty in class SetExpression<E>

See Also:

Set.isEmpty()

Constructor Detail

SetBinding

public SetBinding()

Method Detail

bind

protected final void bind(Observable... dependencies)

Start observing the dependencies for changes. If the value of one of the dependencies changes, the binding is marked as invalid.

Parameters:

dependencies - the dependencies to observe

unbind

protected final void unbind(Observable... dependencies)

Stop observing the dependencies for changes.

Parameters:

dependencies - the dependencies to stop observing

dispose

public void dispose()

A default implementation of dispose() that is empty.

Specified by:

dispose in interface Binding<E>

getDependencies

public ObservableList<?> getDependencies()

A default implementation of getDependencies() that returns an empty ObservableList.

Specified by:

getDependencies in interface Binding<E>

Returns:

an empty ObservableList

get

public final ObservableSet<E> get()

Returns the result of computeValue(). The method computeValue() is only called if the binding is invalid. The result is cached and returned if the binding did not become invalid since the last call of get().

Specified by:

get in interface ObservableObjectValue<E>

Returns:

the current value

onInvalidating

protected void onInvalidating()

The method onInvalidating() can be overridden by extending classes to react, if this binding becomes invalid. The default implementation is empty.

computeValue

protected abstract ObservableSet<E> computeValue()

Calculates the current value of this binding.

Classes extending SetBinding have to provide an implementation of computeValue.

Returns:

the current value

toString

public String toString()

Returns a string representation of this SetBinding object.

Overrides:

toString in class Object

Returns:

a string representation of this SetBinding object.