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Identifying object
relationships ,attributes ,
        methods,
Types of relationships
• Association
• Super-sub structure (generalization
  hierarchy)
• Aggregation and part of a structure
Association
• Represents physical or conceptual
  connection between 2 or more objects
• Binary association
  – Line connecting 2 classes
• Ternary and higher order association
  – Diamond connecting to a class symbol by line
• Association name is written above or
  below the name
• Includes name of the role
Cont..
• Identifying association
• Common association pattern
• Eliminating unnecessary association
Identifying association
• Begins by analyzing the interaction among
  classes
• Ask following questions
  – Is the class capable of fulfilling the required task by
    itself
  – If not, what does it need
  – From what other class can it acquire what it needs
• Guideline
  – Dependency between 2 or more classes
     • Association corresponds to verb or prepositional phrase
  – Reference from one class to another
     • Implicit or taken from knowledge
Common association pattern
• Location association
  – Ex:      next to, part of , contained in
• Communication association
  – Ex :talk to, order to

                                        operator
          customer



                            order
Eliminate unnecessary association
• Implementation association
   – Defer implementation specific association to design phase
   – Not concerned about relationship among business objects
• Ternary association
   – Complicate the representation
   – Req
      • Restate ternary association to binary association
• Directed actions or derived association
   – Can be defined in terms of other association
   – Leads to redundancy
   – Ex:
                          Grant parent of
                raman                          abi


              parent of                     parent of
     raman                     murugan                      abi
Super-sub class relationships
• Generalization hierarchy
• Represents the inheritance re
Identifying object relationships, attributes, methods, and types of relationships
Identifying object relationships, attributes, methods, and types of relationships

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Identifying object relationships, attributes, methods, and types of relationships

  • 2. Types of relationships • Association • Super-sub structure (generalization hierarchy) • Aggregation and part of a structure
  • 3. Association • Represents physical or conceptual connection between 2 or more objects • Binary association – Line connecting 2 classes • Ternary and higher order association – Diamond connecting to a class symbol by line • Association name is written above or below the name • Includes name of the role
  • 4. Cont.. • Identifying association • Common association pattern • Eliminating unnecessary association
  • 5. Identifying association • Begins by analyzing the interaction among classes • Ask following questions – Is the class capable of fulfilling the required task by itself – If not, what does it need – From what other class can it acquire what it needs • Guideline – Dependency between 2 or more classes • Association corresponds to verb or prepositional phrase – Reference from one class to another • Implicit or taken from knowledge
  • 6. Common association pattern • Location association – Ex: next to, part of , contained in • Communication association – Ex :talk to, order to operator customer order
  • 7. Eliminate unnecessary association • Implementation association – Defer implementation specific association to design phase – Not concerned about relationship among business objects • Ternary association – Complicate the representation – Req • Restate ternary association to binary association • Directed actions or derived association – Can be defined in terms of other association – Leads to redundancy – Ex: Grant parent of raman abi parent of parent of raman murugan abi
  • 8. Super-sub class relationships • Generalization hierarchy • Represents the inheritance re