Class ValueHolder<T>

java.lang.Object

uk.ac.manchester.spinnaker.utils.ValueHolder<T>

Type Parameters:

T - The type of value to hold.

public class ValueHolder<T>
extends Object

A simple class that can optionally hold a single value. This class is modifiable.

Author:

Donal Fellows

Constructor Summary

Constructors

Constructor	Description
ValueHolder()	Create an instance.
ValueHolder(T value)	Create an instance.

Method Summary

Modifier and Type	Method	Description
T	getValue()	Get the value held.
void	setValue(T value)	Set the value to hold.
T	update(Function<T,T> function)	Applies a function to update the value of this instance, returning the old value.

Methods inherited from class Object

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

Constructor Details

ValueHolder

public ValueHolder()

Create an instance. The initial value held is null.

ValueHolder

public ValueHolder(T value)

Create an instance.

Parameters:

value - The initial value to hold.

Method Details

getValue

public T getValue()

Get the value held.

Returns:

The value held.

setValue

public void setValue(T value)

Set the value to hold.

Parameters:

value - The new value to hold.

update

public T update(Function<T,T> function)

Applies a function to update the value of this instance, returning the old value.

Parameters:

function - The operation to apply.

Returns:

The old value.