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A specification of classes that implement the Null Object pattern.
Implementors of this interface have a unique instance that represents a
pointer-safe null
. The interpretation of null
may vary; it may mean absence of a value, invalid value, etc. This pattern
combines neatly with the EMFEventType
to implement type-safe and null-pointer-safe enumerations.
API clients should not implement this interface.
Method Summary | |
boolean |
isNull()
Queries whether this is the null instance of a
given implementation class. |
Method Detail |
public boolean isNull()
this
is the null
instance of a
given implementation class. The null
instance must be unique.
true
if I am the special "null" instance;
false
, otherwise
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Guidelines for using Eclipse APIs.
Copyright (c) IBM Corp. and others 2004. All rights reserved.