edu.rice.cs.plt.lambda
Class DelayedThunk<R>

java.lang.Object
  edu.rice.cs.plt.lambda.DelayedThunk<R>

All Implemented Interfaces:

Box<R>, ResolvingThunk<R>, Thunk<R>, java.io.Serializable

public class DelayedThunk<R>
extends java.lang.Object
implements Box<R>, ResolvingThunk<R>, java.io.Serializable

A thunk whose value is set once after creation, but before the first invocation of value().

As a wrapper for arbitrary objects, instances of this class will serialize without error only if the wrapped object is serializable.

See Also:

Serialized Form

Constructor Summary

DelayedThunk()

Method Summary

boolean	isResolved() Test whether the thunk is in a "resolved" state.
static <R> DelayedThunk<R>	make() Call the constructor (allows R to be inferred)
void	set(R val) Set the value.
R	value() Access the value.

Methods inherited from class java.lang.Object

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

Constructor Detail

DelayedThunk

public DelayedThunk()

Method Detail

value

public R value()

Access the value.

Specified by:

value in interface Thunk<R>

Throws:

java.lang.IllegalStateException - if the value has not been set

set

public void set(R val)

Set the value.

Specified by:

set in interface Box<R>

Throws:

java.lang.IllegalStateException - if the value has already been set

isResolved

public boolean isResolved()

Description copied from interface: ResolvingThunk

Test whether the thunk is in a "resolved" state. If true, an invocation of value will return promptly and without exception.

Specified by:

isResolved in interface ResolvingThunk<R>

make

public static <R> DelayedThunk<R> make()

Call the constructor (allows R to be inferred)