gololang

Class Observable

java.lang.Object

gololang.Observable

public final class Observable
extends java.lang.Object

Models a thread-safe observable variable.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	Observable.Function
static interface	Observable.Observer
static interface	Observable.Predicate

Constructor Summary

Constructors

Constructor and Description
Observable(java.lang.Object initialValue) Creates a new observable from an initial value.

Method Summary

Modifier and Type	Method and Description
Observable	filter(Observable.Predicate predicate) Creates an observer that filters the values of this observable.
java.lang.Object	get() Gets the current value.
Observable	map(Observable.Function function) Creates an observer that maps the values of this observable.
Observable	onChange(Observable.Observer observer) Registers an observer.
void	set(java.lang.Object newValue) Changes the current value and notifies all observers.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Observable

public Observable(java.lang.Object initialValue)

Creates a new observable from an initial value.

Parameters:

initialValue - the initial value.

Method Detail

get

public java.lang.Object get()

Gets the current value.

Returns:

the current value.

set

public void set(java.lang.Object newValue)

Changes the current value and notifies all observers.

Parameters:

newValue - the new value.

onChange

public Observable onChange(Observable.Observer observer)

Registers an observer.

Parameters:

observer - an observer.

Returns:

this observable object.

filter

public Observable filter(Observable.Predicate predicate)

Creates an observer that filters the values of this observable.

Parameters:

predicate - a predicate function.

Returns:

an observer whose values filter this observable.

map

public Observable map(Observable.Function function)

Creates an observer that maps the values of this observable.

Parameters:

function - a mapping function.

Returns:

an observer whose values map this observable.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object