net.sf.staccatocommons.lang.thunk
Class Thunks

java.lang.Object
  net.sf.staccatocommons.lang.thunk.Thunks

public class Thunks
extends Object

Class factory methods for some common Thunks

Author:

flbulgarelli

Method Summary

static <A> net.sf.staccatocommons.defs.Thunk<A>	constant(A value) Returns a thunk that returns always the given value
static net.sf.staccatocommons.defs.Thunk<Date>	currentDate() Returns a Thunk that provides the current date
static <A> net.sf.staccatocommons.defs.Thunk<A>	fail(String message, Object... args) Answers a Thunk that, when evaluated, throws an exception with the given formatted message as Ensure.fail(String, Object...)
static <A> net.sf.staccatocommons.defs.Thunk<A>	from(Callable<A> callable) Returns a thunk whose value is retrieved sending Callable.call() to the given Callable
static net.sf.staccatocommons.defs.Thunk<Void>	from(Runnable runnable) Returns a cell that provides not actual value, but a side effect instead, by sending Runnable.run() to the given runnable
static <A> net.sf.staccatocommons.defs.Thunk<A>	null_() Returns a constant Thunk that always provides null
static <A> net.sf.staccatocommons.defs.Thunk<A>	undefined() Returns a thunk that when evaluated throws a RuntimeException.
static <A> net.sf.staccatocommons.defs.function.Function<net.sf.staccatocommons.defs.Thunk<A>,A>	value() Returns a Function that evaluates its Thunk argument

Methods inherited from class java.lang.Object

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

Method Detail

constant

public static <A> net.sf.staccatocommons.defs.Thunk<A> constant(A value)

Returns a thunk that returns always the given value

Type Parameters:

A -

Parameters:

value - the value the constant thunk will return as when invoking Thunk.value()

Returns:

a new thunk

null_

@Constant
public static <A> net.sf.staccatocommons.defs.Thunk<A> null_()

Returns a constant Thunk that always provides null

Type Parameters:

A -

Returns:

a constant thunk of nulls

currentDate

@Constant
public static net.sf.staccatocommons.defs.Thunk<Date> currentDate()

Returns a Thunk that provides the current date

Returns:

a constant thunk that provides new Date()

from

public static <A> net.sf.staccatocommons.defs.Thunk<A> from(@NonNull
                                                            Callable<A> callable)

Returns a thunk whose value is retrieved sending Callable.call() to the given Callable

Type Parameters:

A -

Parameters:

callable -

Returns:

a new Thunk that wraps the given callable

undefined

@Constant
public static <A> net.sf.staccatocommons.defs.Thunk<A> undefined()

Returns a thunk that when evaluated throws a RuntimeException. This Thunk is said to have an undefined element.

Type Parameters:

A -

Returns:

a Constant undefined thunk

fail

public static <A> net.sf.staccatocommons.defs.Thunk<A> fail(@NonNull
                                                            String message,
                                                            Object... args)

Answers a Thunk that, when evaluated, throws an exception with the given formatted message as Ensure.fail(String, Object...)

Parameters:

message - the message

args - the message arguments

Returns:

a new Thunk that fails with the given message

from

public static net.sf.staccatocommons.defs.Thunk<Void> from(@NonNull
                                                           Runnable runnable)

Returns a cell that provides not actual value, but a side effect instead, by sending Runnable.run() to the given runnable

Parameters:

runnable -

Returns:

a new Thunk that wraps the given Runnable

value

@Constant
public static <A> net.sf.staccatocommons.defs.function.Function<net.sf.staccatocommons.defs.Thunk<A>,A> value()

Returns a Function that evaluates its Thunk argument

Type Parameters:

A -

Returns:

a constant Function