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120 lines
2.9 KiB
Plaintext
120 lines
2.9 KiB
Plaintext
Here is a reference to the UML class diagram symbols:
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(Taken from a number of sources.)
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Class
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-----
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A Class description containing a
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____________
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| Class Name |
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|------------|
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| Attributes |
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|------------|
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| Operations |
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|____________|
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Association
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-----------
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An association represents a physical or conceptual connection
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betwen objects. This is represented by a line between the two objects.
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If the association has a name it would often be written on top.
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AssocName
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Class1 ----------- Class2
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There is a possiblity of a multidirectional association that would be
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represented by a diamond connecting the related sets.
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Class1 -----<O>---- Class3
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Class2
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Arrows can be used to indicate the navigablity of a association.
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So an arrow from one class to another would indicate that Class1
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uses the services of Class2 but Class2 is not aware of Class1.
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It also indicates that nature of Class2 scope. Since there
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is no aggregation relationship here, Class2 may outlive Class1
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instances. This would be used to indicate a pointer or reference
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relationship.
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Class1 -------> Class2
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In some places it is necessary to represent that a Class can
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be associated with a set instead of a single instance. This
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will be represented by a star at the end of the association.
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Class1 ------->* Class2
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Composition (Strong Aggregation)
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---------
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This means that Class2 is a part of Class1. It is a strong form
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of aggregation in that when Class1 is destroyed Class2 goes with it.
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The symbol for a composition relationship is a diamond filled to an arrow.
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Class1 <*>-----> Class2
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Aggregation
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-----------
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A weaker form of aggregation than composition is represented with
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an unfilled diamond. It still demotes the life time of Class2 is
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restricted to Class1, but Class2 is not part of Class1. This may
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be implemented by a pointer in Class1 to Class2 with the dtor
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destroying Class2.
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Class1 <>------> Class2
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Inheritance
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-----------
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Inheratance is indicated with an triangle pointing up to the
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class form which the other derives. (Having no triangles a
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A will do.)
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Class1
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A
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Class2
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So now a quick example:
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+--> Shape
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| A
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parent_ | |
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+--- Polygon <>------------->* Point
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This would indicate that a Polygon is derived from a Shape. It also
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indicates that Polygon can have a reference to a Shape. Further,
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Polygon contains a set of Points that it is responsible for.
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This might be implemented like
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class Shape
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{//...
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};
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class Polygon: public Shape
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{
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private:
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Shape* parent_;
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list<auto_ptr<Point>> points_;
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public:
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//...
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};
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References:
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UML Class Diagrams
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Robert C. Martin
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Engineering Notebook Column
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C++ Report, August, 1997
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http://www.oma.com/PDF/umlClassDiagrams.pdf
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OML Object Model
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http://wwwis.cs.utwente.nl:8080/dmrg/MEE/misop007/
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