org.opensha.sra.riskmaps.func
Class EmptySet

java.lang.Object
  org.opensha.sra.riskmaps.func.EmptySet

All Implemented Interfaces:

SetAPI

public class EmptySet
extends Object
implements SetAPI

This class represents the mathematical idea of an empty set. Empty sets contain no values. The union of a set with the empty set is simply the original set itself, and the intersection of a set with the empty set is again an empty set. Empty sets are neither discrete nor continuous.

 -=* CHANGE LOG *=-
 06/19/2008 -- EMM: Original implementation.

Version:

0.0.1

Author:

Eric Martinez

Constructor Summary

EmptySet()

Method Summary

boolean	contains(double x) Checks if the given value x exists within this set.
boolean	equals(SetAPI set) Checks if the calling SetAPI and the given set are logically equal.
SetAPI	intersectionOf(SetAPI set) Takes the intersection of the given set with the calling object.
double	lowerBound()
SetAPI	unionWith(SetAPI set) Takes the union of the given set with the calling object.
double	upperBound()

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptySet

public EmptySet()

Method Detail

contains

public boolean contains(double x)

Checks if the given value x exists within this set. Since this set is empty, the function always returns false.

Specified by:

contains in interface SetAPI

Parameters:

x - The value to check for.

Returns:

False, this set is always empty.

unionWith

public SetAPI unionWith(SetAPI set)

Takes the union of the given set with the calling object. Since this set is empty, the given set is always returned.

Specified by:

unionWith in interface SetAPI

Parameters:

set - The set to union with this set.

Returns:

A set with the same values as the passed set, namely, the passed set itself.

intersectionOf

public SetAPI intersectionOf(SetAPI set)

Takes the intersection of the given set with the calling object. Since this set is empty, the empty set is always returned.

Specified by:

intersectionOf in interface SetAPI

Parameters:

set - The set to intersect with this set.

Returns:

An empty set, namely the calling set.

equals

public boolean equals(SetAPI set)

Checks if the calling SetAPI and the given set are logically equal.

Specified by:

equals in interface SetAPI

Returns:

True if both sets are empty sets, false otherwise. Note that a continuous or discrete set containing no values is not considered an empty set.

lowerBound

public double lowerBound()

Specified by:

lowerBound in interface SetAPI

Returns:

Not a number (NaN), this set is empty.

upperBound

public double upperBound()

Specified by:

upperBound in interface SetAPI

Returns:

Not a number (NaN), this set is empty.