Class LeftIdentity

java.lang.Object

org.apache.commons.functor.core.LeftIdentity

public final class LeftIdentity
extends Object

Holder class for a left-identity BinaryFunction (evaluates to the left argument) and a left-identity BinaryPredicate (tests whether left Boolean argument equals Boolean.TRUE).

Version:

$Revision$ $Date$

Field Summary

Fields

Modifier and Type	Field	Description
static final BinaryFunction<Object,Object,Object>	FUNCTION	Left-identity function.
static final BinaryPredicate<Boolean,Object>	PREDICATE	Left-identity predicate.

Constructor Summary

Constructors

Constructor	Description
LeftIdentity()	Create a new LeftIdentity (for clients that require an object).

Method Summary

Modifier and Type	Method	Description
static <L,R> BinaryFunction<L,R,L>	function()	Get a Left-identity BinaryFunction.
static <R> BinaryPredicate<Boolean,R>	predicate()	Get a left-identity BinaryPredicate.

Methods inherited from class Object

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

Field Details

FUNCTION

public static final BinaryFunction<Object,Object,Object> FUNCTION

Left-identity function.

PREDICATE

public static final BinaryPredicate<Boolean,Object> PREDICATE

Left-identity predicate.

Constructor Details

LeftIdentity

public LeftIdentity()

Create a new LeftIdentity (for clients that require an object).

Method Details

function

public static <L,R> BinaryFunction<L,R,L> function()

Get a Left-identity BinaryFunction.

Type Parameters:

L - the left argument type.

R - the right argument type.

Returns:

BinaryFunctioninvalid input: '<'L, R, L>

predicate

public static <R> BinaryPredicate<Boolean,R> predicate()

Get a left-identity BinaryPredicate.

Type Parameters:

R - the right argument type.

Returns:

BinaryPredicateinvalid input: '<'Boolean, R>