net.sf.jga.fn.logical
Class LogicalAnd

java.lang.Object
  net.sf.jga.fn.Functor<R>
      net.sf.jga.fn.BinaryFunctor<java.lang.Boolean,java.lang.Boolean,java.lang.Boolean>
          net.sf.jga.fn.logical.LogicalAnd

All Implemented Interfaces:

java.io.Serializable, Visitable

public class LogicalAnd
extends BinaryFunctor<java.lang.Boolean,java.lang.Boolean,java.lang.Boolean>

Binary Predicate that returns true when Boolean arguments x and y are both true.

Note that this functor does not short circuit the evaluation of the second argument. The reason for this is that, by itself, this functor accepts only boolean arguments. When it is used in conjunction with the adaptor functors to implement compound functors, the adaptor cannot know that the functor it is adapting may not need to use both arguments, so the adaptor will fully evaluate both arguments before passing them to the And functor. This would give the illusion that the short circuit logic is broken, when it is in fact unimplementable using the standard functor mechanism.

Copyright © 2002 David A. Hall

Author:

David A. Hall

See Also:

Serialized Form

Nested Class Summary

static interface

LogicalAnd.Visitor Interface for classes that may interpret a LogicalAnd predicate.

Constructor Summary

LogicalAnd()

Method Summary

void	accept(Visitor v) Calls the Visitor's visit(LogicalAnd) method, if it implements the nested Visitor interface.
java.lang.Boolean	fn(java.lang.Boolean x, java.lang.Boolean y) Given Boolean arguments x and y, returns true when both x and y are true, otherwise false.
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

LogicalAnd

public LogicalAnd()

Method Detail

fn

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

Given Boolean arguments x and y, returns true when both x and y are true, otherwise false.

Specified by:

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

Returns:

x & y

accept

public void accept(Visitor v)

Calls the Visitor's visit(LogicalAnd) 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