org.xshare.base.predicate
Interface BinaryPredicate

All Known Implementing Classes:

BinaryAndPredicate, BinaryNandPredicate, BinaryNorPredicate, BinaryOrPredicate, BinaryXorPredicate

public interface BinaryPredicate

A binary predicate represents a arbitrary operation on two objects and returns as result of this operation a boolean value.

The implementing classes have to ensure two things:

• that a ClassCastException is thrown, if they can't operate on the given object
• that is it safe to pass null as value

Since:

0.20

Version:

$Revision: 1.3 $

Author:

Oliver Fischer

See Also:

BinaryFunction

Field Summary

static BinaryPredicate	ALWAYS_FALSE Instance of a BinaryPredicate which is always returns false.
static BinaryPredicate	ALWAYS_TRUE Instance of a BinaryPredicate which is always returns true.

Method Summary

boolean

exec(java.lang.Object pFirst, java.lang.Object pSecond) Executes the implemented operation on both given objects and returns a boolean value as the result of the operation.

Field Detail

ALWAYS_FALSE

public static final BinaryPredicate ALWAYS_FALSE

Instance of a BinaryPredicate which is always returns false.

ALWAYS_TRUE

public static final BinaryPredicate ALWAYS_TRUE

Instance of a BinaryPredicate which is always returns true.

Method Detail

exec

public boolean exec(java.lang.Object pFirst,
                    java.lang.Object pSecond)

Executes the implemented operation on both given objects and returns a boolean value as the result of the operation.

Throws:

java.lang.ClassCastException - if the implementing class can not operate on the given object.