org.opencastproject.util.data

Class VCell<A>

java.lang.Object

org.opencastproject.util.data.Cell<A>

org.opencastproject.util.data.VCell<A>

Type Parameters:

A - the value type

public final class VCell<A>
extends Cell<A>

Value cell, a mutable data container. Cells provide a pattern that reverses the listener pattern. Instead of propagating changes of a value to registered listeners via callbacks, the dependent object just holds a reference to a cell and pulls the value when needed. Cells must not contain null!

Constructor Summary

Constructors

Constructor and Description
VCell(A a, boolean stable)

Method Summary

Modifier and Type	Method and Description
static <A> VCell<A>	cell(A a) Constructor function.
protected Tuple<A,Object>	change()
A	get() Get the cell's value.
static <A> VCell<A>	iocell(A a)
<B> Cell<B>	lift(Function<A,B> f)
static <A> VCell<Option<A>>	ocell() Create a cell containing none.
static <A> VCell<Option<A>>	ocell(A a) Create a cell containing some a.
void	set(A a) Set the cell's value.

Methods inherited from class java.lang.Object

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

Constructor Detail

VCell

public VCell(A a,
             boolean stable)

Method Detail

cell

public static <A> VCell<A> cell(A a)

Constructor function.

iocell

public static <A> VCell<A> iocell(A a)

ocell

public static <A> VCell<Option<A>> ocell(A a)

Create a cell containing some a.

ocell

public static <A> VCell<Option<A>> ocell()

Create a cell containing none.

get

public A get()

Get the cell's value.

Specified by:

get in class Cell<A>

change

protected Tuple<A,Object> change()

Specified by:

change in class Cell<A>

set

public void set(A a)

Set the cell's value.

lift

public <B> Cell<B> lift(Function<A,B> f)

Specified by:

lift in class Cell<A>