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java.lang.Objectcom.citra.pivot.olap.set.AbstractSetSelection
com.citra.pivot.olap.set.EmptySetSelection
public final class EmptySetSelection
EmptySetSelection represents a set with no tuples.
Constructor Summary | |
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EmptySetSelection()
Constructs an EmptySetSelection. |
Method Summary | |
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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 |
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resolveSelection, resolveSet |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public EmptySetSelection()
Method Detail |
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public boolean equals(Object o)
The equals
method implements an equivalence relation
on non-null object references:
x
, x.equals(x)
should return
true
.
x
and y
, x.equals(y)
should return true
if and only if
y.equals(x)
returns true
.
x
, y
, and z
, if
x.equals(y)
returns true
and
y.equals(z)
returns true
, then
x.equals(z)
should return true
.
x
and y
, multiple invocations of
x.equals(y) consistently return true
or consistently return false
, provided no
information used in equals
comparisons on the
objects is modified.
x
,
x.equals(null)
should return false
.
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.
equals
in class Object
o
- the reference object with which to compare.
true
if this object is the same as the obj
argument; false
otherwise.Object.hashCode()
,
Hashtable
public static EmptySetSelection instance()
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