net.sf.jga.fn.adaptor
Class Identity<T>

java.lang.Object
  net.sf.jga.fn.Functor<R>
      net.sf.jga.fn.UnaryFunctor<T,T>
          net.sf.jga.fn.adaptor.Identity<T>

All Implemented Interfaces:

java.io.Serializable, Visitable

public class Identity<T>
extends UnaryFunctor<T,T>

Unary Functor that returns the runtime argument.

Copyright © 2002-2005 David A. Hall

Author:

David A. Hall

See Also:

Serialized Form

Nested Class Summary

static class	Identity.Accessor<T> A Generator that returns the last value passed to an associated Identity.
static interface	Identity.AccessorVisitor Interface for classes that may interpret an Identity.Accessor.
static interface	Identity.Visitor Interface for classes that may interpret an Identity functor.

Constructor Summary

Identity()

Method Summary

void	accept(Visitor v) Calls the Visitor's visit(Identity) method, if it implements the nested Visitor interface.
Generator<T>	accessor() Returns a Generator that will always return the last value passed to this functor.
T	arg() Returns the last argument that was given, or null if called prior to the first call to fn().
T	fn(T x) Given one argument, returns it.
java.lang.String	toString()

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

bind, bind0th, bindNth, compose, compose, compose, composeNth, composeNth, eval, generate, generateNth

Methods inherited from class java.lang.Object

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

Constructor Detail

Identity

public Identity()

Method Detail

arg

public T arg()

Returns the last argument that was given, or null if called prior to the first call to fn(). This value does not persist when the functor is serialized.

Returns:

the last argument that was given or null.

accessor

public Generator<T> accessor()

Returns a Generator that will always return the last value passed to this functor.

fn

public T fn(T x)

Given one argument, returns it.

Specified by:

fn in class UnaryFunctor<T,T>

Returns:

x

accept

public void accept(Visitor v)

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

Specified by:

accept in interface Visitable

Overrides:

accept in class Functor<T>

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object