Copyright © 2011 Citra Technologies. All Rights Reserved.

com.citra.pivot.olap.set
Class EmptySetSelection

java.lang.Object
  extended by com.citra.pivot.olap.set.AbstractSetSelection
      extended by com.citra.pivot.olap.set.EmptySetSelection
All Implemented Interfaces:
OlapSelection, SetSelection

public final class EmptySetSelection
extends AbstractSetSelection

EmptySetSelection represents a set with no tuples.


Constructor Summary
EmptySetSelection()
          Constructs an EmptySetSelection.
 
Method Summary
 boolean equals(Object o)
          Indicates whether some other object is "equal to" this one.
static EmptySetSelection instance()
          Returns an EmptySetSelection static instance.
 
Methods inherited from class com.citra.pivot.olap.set.AbstractSetSelection
resolveSelection, resolveSet
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

EmptySetSelection

public EmptySetSelection()
Constructs an EmptySetSelection.

Method Detail

equals

public boolean equals(Object o)
Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

The equals method for class Object implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values x and y, this method returns true if and only if x and y refer to the same object (x == y has the value true).

Note that it is generally necessary to override the hashCode method whenever this method is overridden, so as to maintain the general contract for the hashCode method, which states that equal objects must have equal hash codes.

Overrides:
equals in class Object
Parameters:
o - the reference object with which to compare.
Returns:
true if this object is the same as the obj argument; false otherwise.
See Also:
Object.hashCode(), Hashtable

instance

public static EmptySetSelection instance()
Returns an EmptySetSelection static instance.

Returns:
the empty set selection

Copyright © 2011 Citra Technologies. All Rights Reserved.