de.rwth.domains.templates
Class ComposedFunction

java.lang.Object
  |
  +--de.rwth.domains.templates.ComposedFunction

All Implemented Interfaces:

Function

public class ComposedFunction

extends java.lang.Object

implements Function

Implements functions by composition of two functions.

Version:

$Id: ComposedFunction.java,v 1.2 2002/09/17 06:53:53 mohnen Exp $

Author:

Markus Mohnen

Inner classes inherited from class de.rwth.domains.Function

Function.Tools

Field Summary

protected Function	f The second function in this composition.
protected Function	g The first function in this composition.

Constructor Summary

ComposedFunction(Function f, Function g)
Creates a new ComposedFunction instance.

Method Summary

java.lang.Object	apply(java.lang.Object x) Applies this function to an argument and returns the result.
boolean	equals(java.lang.Object o)
Set	getDomain() Returns the domain of this function.
Set	getRange() Returns the range (co-domain) of this function.
static void	main(java.lang.String[] args)
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

f

protected Function f

The second function in this composition.

g

protected Function g

The first function in this composition.

Constructor Detail

ComposedFunction

public ComposedFunction(Function f,
                        Function g)
                 throws java.lang.IllegalArgumentException

Creates a new ComposedFunction instance. Read as "f o g" in the usual mathematical sense: The resulting function applies g to an argument and subsequently f to the result.

Parameters:

f - a Function value: The second function.

g - a Function value: The first function.

Throws:

java.lang.IllegalArgumentException - if the range of g is not the domain of f

Method Detail

apply

public java.lang.Object apply(java.lang.Object x)
                       throws FunctionException

Description copied from interface: Function

Applies this function to an argument and returns the result.

Specified by:

apply in interface Function

Following copied from interface: de.rwth.domains.Function

Parameters:

x - the argument

Returns:

this function's value for argument x

Throws:

FunctionException - if x is not an element of the functions domain.

getDomain

public Set getDomain()

Description copied from interface: Function

Returns the domain of this function.

Specified by:

getDomain in interface Function

Following copied from interface: de.rwth.domains.Function

Returns:

a value of type Set

getRange

public Set getRange()

Description copied from interface: Function

Returns the range (co-domain) of this function.

Specified by:

getRange in interface Function

Following copied from interface: de.rwth.domains.Function

Returns:

a value of type Set

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

main

public static void main(java.lang.String[] args)