uk.co.strangeskies.expression

Class IdentityExpression<T>

java.lang.Object

uk.co.strangeskies.expression.ActiveExpression<T>

uk.co.strangeskies.expression.IdentityExpression<T>

Type Parameters:

T - The type of the expression.

All Implemented Interfaces:

Expression<T>, Property<T>

public class IdentityExpression<T>
extends ActiveExpression<T>
implements Property<T>

An Expression based on the behavior of the IdentityProperty class, with the lazy updating behavior of LockingExpression for Observers.

Constructor Summary

Constructors

Constructor and Description
IdentityExpression() Construct with a default value of null.
IdentityExpression(T value) Construct with the given default value.

Method Summary

Modifier and Type	Method and Description
T	get() Get the current value of the property.
protected T	getValueImpl(boolean dirty) Implementing classes should compute the value of the Expression here.
T	set(T value) Set the value of this property to the given value.

Methods inherited from class uk.co.strangeskies.expression.ActiveExpression

beginWrite, cancelChange, createObservable, endWrite, fireChange, getValue, invalidations, isChanging, write

Methods inherited from class java.lang.Object

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

Methods inherited from interface uk.co.strangeskies.property.Property

map, over, setDefault, tryGet, unset

Methods inherited from interface uk.co.strangeskies.expression.Expression

anonymize, decoupleValue, immutable, over, over

Constructor Detail

IdentityExpression

public IdentityExpression()

Construct with a default value of null.

IdentityExpression

public IdentityExpression(T value)

Construct with the given default value.

Parameters:

value - The initial value of the expression.

Method Detail

set

public T set(T value)

Description copied from interface: Property

Set the value of this property to the given value.

Specified by:

set in interface Property<T>

Parameters:

value - The new value to set for this property.

Returns:

The previous value of this property.

getValueImpl

protected final T getValueImpl(boolean dirty)

Description copied from class: ActiveExpression

Implementing classes should compute the value of the Expression here. Read lock is guaranteed to be obtained. This method should never be invoked manually.

Specified by:

getValueImpl in class ActiveExpression<T>

Parameters:

dirty - Whether the expression has been mutated since this method was last invoked.

Returns:

The value of this Expression.

get

public final T get()

Description copied from interface: Property

Get the current value of the property.

Specified by:

get in interface Property<T>

Returns:

The current value.