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IBM Rational Software Modeler Release 6.0 |
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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.