net.sf.jga.fn.adaptor
Class GenerateNth<R>

java.lang.Object
  net.sf.jga.fn.Functor<R>
      net.sf.jga.fn.adaptor.GenerateNth<R>

All Implemented Interfaces:

java.io.Serializable, Visitable

public class GenerateNth<R>
extends Functor<R>

Functor that uses a Generator to produce the Nth argument to a given Functor. The generated result is inserted into the argument list given to this functor with the modified list being passed to the nested functor.

Copyright © 2009 David A. Hall

Author:

David A. Hall

See Also:

Serialized Form

Nested Class Summary

static interface

GenerateNth.Visitor Interface for classes that may interpret a Generate2nd functor.

Constructor Summary

GenerateNth(Functor<R> fn, int idx, Generator<?> gen)

Method Summary

void	accept(Visitor v) Calls the Visitor's visit(Generate2nd) method, if it implements the nested Visitor interface.
R	eval(java.lang.Object... args) Returns the results of the functor, using the nested generator to produce the Nth argument.
Functor<R>	getFunctor() Returns the Functor that is invoked
Generator<?>	getGenerator() Returns the generator that produces the indicated argument.
java.lang.String	toString()

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

bind0th, bindNth, composeNth, composeNth, generateNth

Methods inherited from class java.lang.Object

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

Constructor Detail

GenerateNth

public GenerateNth(Functor<R> fn,
                   int idx,
                   Generator<?> gen)

Method Detail

getFunctor

public Functor<R> getFunctor()

Returns the Functor that is invoked

getGenerator

public Generator<?> getGenerator()

Returns the generator that produces the indicated argument.

eval

public R eval(java.lang.Object... args)

Returns the results of the functor, using the nested generator to produce the Nth argument.

Specified by:

eval in class Functor<R>

Returns:

fn.eval(args[0], ..., args[N - 1], gen(), args[N], ...)

Throws:

java.lang.ArrayIndexOutOfBoundsException - if the length of the args array is less than the starting index given at construction.

accept

public void accept(Visitor v)

Calls the Visitor's visit(Generate2nd) method, if it implements the nested Visitor interface.

Specified by:

accept in interface Visitable

Overrides:

accept in class Functor<R>

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object