uk.co.jezuk.mango
Class Predicates

java.lang.Object
  uk.co.jezuk.mango.Predicates

public class Predicates

extends java.lang.Object

The Mango Library Unary and Binary Predicates

Version:

$Id: Predicates.java 80 2003-04-03 12:44:26Z jez $

Author:

Jez Higgins, jez@jezuk.co.uk

Method Summary

static BinaryPredicate	And(BinaryPredicate pred1, BinaryPredicate pred2) A BinaryPredicate which returns the logical AND of two other BinaryPredicate.
static Predicate	And(Predicate pred1, Predicate pred2) A Predicate which returns the logical AND of two other Predicate.
static BinaryPredicate	EqualTo() BinaryPredicate testing for equality.
static Predicate	False() A Predicate which always returns false
static BinaryPredicate	GreaterThan() BinaryPredicate that returns true if x is greater than y.
static BinaryPredicate	GreaterThanEquals() BinaryPredicate that returns true if x is greater than or equal to y.
static BinaryPredicate	LessThan() BinaryPredicate that returns true if x is less than y.
static BinaryPredicate	LessThanEquals() BinaryPredicate that returns true if x is less than or equal to y.
static BinaryPredicate	Not(BinaryPredicate pred) A BinaryPredicate which is the logical negation of some other BinaryPredicate.
static Predicate	Not(Predicate pred) A Predicate which is the logical negation of some other Predicate.
static BinaryPredicate	NotEqualTo() true if not(x.equals(y)), (x == null) && not(y == null) or not(x == null) && (y == null)
static BinaryPredicate	Or(BinaryPredicate pred1, BinaryPredicate pred2) A BinaryPredicate which returns the logical OR of two other BinaryPredicate.
static Predicate	Or(Predicate pred1, Predicate pred2) A Predicate which returns the logical OR of two other Predicate.
static Predicate	True() A Predicate which always returns true

Methods inherited from class java.lang.Object

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

Method Detail

True

public static Predicate True()

A Predicate which always returns true

False

public static Predicate False()

A Predicate which always returns false

Not

public static Predicate Not(Predicate pred)

A Predicate which is the logical negation of some other Predicate. If n is a Not object, and pred is the Predicate it was constructed with, then n.test(x) returns !pred.test(x).

And

public static Predicate And(Predicate pred1,
                            Predicate pred2)

A Predicate which returns the logical AND of two other Predicate. If a is an And object, constructed with pred1 and pred2, then a.test(x) returns pred1.test(x) && pred2.test(x)

Or

public static Predicate Or(Predicate pred1,
                           Predicate pred2)

A Predicate which returns the logical OR of two other Predicate. If a is an Or object, constructed with pred1 and pred2, then a.test(x) returns pred1.test(x) || pred2.test(x)

EqualTo

public static BinaryPredicate EqualTo()

BinaryPredicate testing for equality. true if x.equals(y) or (x == null && y == null)

GreaterThan

public static BinaryPredicate GreaterThan()

BinaryPredicate that returns true if x is greater than y. x and y must implement the java.lang.Comparable interface.

GreaterThanEquals

public static BinaryPredicate GreaterThanEquals()

BinaryPredicate that returns true if x is greater than or equal to y. x and y must implement the java.lang.Comparable interface.

LessThan

public static BinaryPredicate LessThan()

BinaryPredicate that returns true if x is less than y. x and y must implement the java.lang.Comparable interface.

LessThanEquals

public static BinaryPredicate LessThanEquals()

BinaryPredicate that returns true if x is less than or equal to y. x and y must implement the java.lang.Comparable interface.

NotEqualTo

public static BinaryPredicate NotEqualTo()

true if not(x.equals(y)), (x == null) && not(y == null) or not(x == null) && (y == null)

Not

public static BinaryPredicate Not(BinaryPredicate pred)

A BinaryPredicate which is the logical negation of some other BinaryPredicate. If n is a Not object, and pred is the Predicate it was constructed with, then n.test(x,y) returns !pred.test(x,y).

And

public static BinaryPredicate And(BinaryPredicate pred1,
                                  BinaryPredicate pred2)

A BinaryPredicate which returns the logical AND of two other BinaryPredicate. If a is an And object, constructed with pred1 and pred2, then a.test(x,y) returns pred1.test(x,y) && pred2.test(x,y)

Or

public static BinaryPredicate Or(BinaryPredicate pred1,
                                 BinaryPredicate pred2)

A BinaryPredicate which returns the logical OR of two other BinaryPredicate. If a is an Or object, constructed with pred1 and pred2, then a.test(x,y) returns pred1.test(x,y) || pred2.test(x,y)