org.apache.commons.functor.core.comparator
Class IsLessThan<T>

java.lang.Object
  org.apache.commons.functor.core.comparator.IsLessThan<T>

All Implemented Interfaces:

Serializable, BinaryFunctor<T,T>, BinaryPredicate<T,T>, Functor

public final class IsLessThan<T>
extends Object
implements BinaryPredicate<T,T>, Serializable

A BinaryPredicate that tests true iff the left argument is greater than the right argument under the specified Comparator. When no (or a null Comparator is specified, a Comparable Comparator is used.

Version:

$Revision: 1166345 $ $Date: 2011-09-07 21:47:15 +0200 (Wed, 07 Sep 2011) $

Author:

Rodney Waldhoff

See Also:

Serialized Form

Field Summary

static IsLessThan<Comparable<?>>

INSTANCE Basic IsLessThan instance.

Constructor Summary

IsLessThan()
Construct a IsLessThan predicate for Comparables.

IsLessThan(Comparator<? super T> comparator)
Construct a IsLessThan predicate for the given Comparator.

Method Summary

boolean	equals(IsLessThan<?> that) Learn whether a given IsLessThan is equal to this.
boolean	equals(Object that) Indicates whether some other object is "equal to" this functor.
int	hashCode() Returns a hash code for this functor adhering to the general Object.hashCode contract.
static <T extends Comparable<?>> IsLessThan<T>	instance() Get a typed IsLessThan instance.
static <T extends Comparable<?>> UnaryPredicate<T>	instance(T right) Get an IsLessThan UnaryPredicate.
boolean	test(T left, T right) Return true iff the left parameter is less than the right parameter under my current Comparator.
String	toString() Returns a human readable description of this functor.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final IsLessThan<Comparable<?>> INSTANCE

Basic IsLessThan instance.

Constructor Detail

IsLessThan

public IsLessThan()

Construct a IsLessThan predicate for Comparables.

IsLessThan

public IsLessThan(Comparator<? super T> comparator)

Construct a IsLessThan predicate for the given Comparator.

Parameters:

comparator - the Comparator, when null, a Comparator for Comparables will be used.

Method Detail

test

public boolean test(T left,
                    T right)

Return true iff the left parameter is less than the right parameter under my current Comparator. Evaluate this predicate.

Specified by:

test in interface BinaryPredicate<T,T>

Parameters:

left - the L element of the ordered pair of arguments

right - the R element of the ordered pair of arguments

Returns:

the result of this test for the given arguments

equals

public boolean equals(Object that)

Indicates whether some other object is "equal to" this functor. This method must adhere to general Object.equals contract. Additionally, this method can return true only if the specified Object implements the same functor interface and is known to produce the same results and/or side-effects for the same arguments (if any).

While implementators are strongly encouraged to override the default Object implementation of this method, note that the default Object implementation does in fact adhere to the functor equals contract.

Specified by:

equals in interface Functor

Overrides:

equals in class Object

Parameters:

that - the object to compare this functor to

Returns:

true iff the given object implements this functor interface, and is known to produce the same results and/or side-effects for the same arguments (if any).

See Also:

Functor.hashCode()

equals

public boolean equals(IsLessThan<?> that)

Learn whether a given IsLessThan is equal to this.

Parameters:

that - IsLessThan to test

Returns:

boolean

hashCode

public int hashCode()

Returns a hash code for this functor adhering to the general Object.hashCode contract. Implementators are strongly encouraged but not strictly required to override the default Object implementation of this method.

Specified by:

hashCode in interface Functor

Overrides:

hashCode in class Object

Returns:

a hash code for this functor

See Also:

Functor.equals(java.lang.Object)

toString

public String toString()

Returns a human readable description of this functor. Implementators are strongly encouraged but not strictly required to override the default Object implementation of this method.

Specified by:

toString in interface Functor

Overrides:

toString in class Object

Returns:

a human readable description of this functor

instance

public static <T extends Comparable<?>> IsLessThan<T> instance()

Get a typed IsLessThan instance.

Type Parameters:

T -

Returns:

IsLessThan

instance

public static <T extends Comparable<?>> UnaryPredicate<T> instance(T right)

Get an IsLessThan UnaryPredicate.

Parameters:

right - the right side object of the comparison.

Returns:

UnaryPredicate