net.sf.jga.fn.comparison
Class Less<T>

java.lang.Object
  net.sf.jga.fn.Functor<R>
      net.sf.jga.fn.BinaryFunctor<T,T,java.lang.Boolean>
          net.sf.jga.fn.comparison.Less<T>

All Implemented Interfaces:

java.io.Serializable, Visitable

Direct Known Subclasses:

Less.Comparable

public class Less<T>
extends BinaryFunctor<T,T,java.lang.Boolean>

Binary Predicate that returns TRUE for arguments x and y when x < y. The comparison is performed using a comparator supplied at construction time, although a default comparator will be used if the nested Comparable class' default constructor is used. The behaviour of this class in the presence of null arguments is left to the implementation of the specific Comparator, however it is generally safe to assume that using null arguments will cause a NullPointerException to be thrown.

To serialize a Less predicate, the comparator passed at construction must be Serializable.

Copyright © 2002-2005 David A. Hall

Author:

David A. Hall

See Also:

Serialized Form

Nested Class Summary

static class	Less.Comparable<T extends java.lang.Comparable<? super T>> Less predicate for use with Comparable arguments.
static interface	Less.Visitor Interface for classes that may interpret a Less predicate.

Constructor Summary

Less(java.util.Comparator<? super T> comp)
Builds a Less predicate using the given Comparator

Method Summary

void	accept(Visitor v) Calls the Visitor's visit(Less) method, if it implements the nested Visitor interface.
java.lang.Boolean	fn(T x, T y) Given Comparable arguments x and y, returns x < y.
java.util.Comparator<? super T>	getComparator() Returns the comparator in use by this functor
java.lang.String	toString()

Methods inherited from class net.sf.jga.fn.BinaryFunctor

bind, bind0th, bind1st, bind2nd, bindNth, compose, compose, composeNth, distribute, eval, generate, generate1st, generate2nd, generateNth

Methods inherited from class net.sf.jga.fn.Functor

composeNth

Methods inherited from class java.lang.Object

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

Constructor Detail

Less

public Less(java.util.Comparator<? super T> comp)

Builds a Less predicate using the given Comparator

Throws:

java.lang.IllegalArgumentException - if the argument is null

Method Detail

getComparator

public java.util.Comparator<? super T> getComparator()

Returns the comparator in use by this functor

Returns:

the comparator in use by this functor

fn

public java.lang.Boolean fn(T x,
                            T y)

Given Comparable arguments x and y, returns x < y.

Specified by:

fn in class BinaryFunctor<T,T,java.lang.Boolean>

Returns:

x < y

Throws:

java.lang.NullPointerException - if either argument is null

accept

public void accept(Visitor v)

Calls the Visitor's visit(Less) method, if it implements the nested Visitor interface.

Specified by:

accept in interface Visitable

Overrides:

accept in class Functor<java.lang.Boolean>

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object