object oriented analysis and design

1. 1
Domain Object Model
Chapter 10
Applying UML and Patterns
Thanks-Craig Larman
University of Education Okara

2. 2
Domain Model Relationships
Domain Model
Use Case Model
Interaction Diagrams
Glossary
Design
Requirements
Business Model
Classes, attributes, associations
Domain
objects
Elaboration on some terms
University of Education Okara

3. 3
A Domain Model
 Definition. A visual representation of conceptual classes
or real-world objects in a problem domain.
 Identifying a rich set of objects or conceptual classes
is at the heart of object-oriented analysis.
 The UML contains notation in the form of class
diagrams to illustrate domain models.
Also called conceptual models, domain object models or
analysis object models.
Forget about USE CASE ( as it is not object oriented now)
University of Education Okara

4. 4
Domain Model UML Notation
 Illustrated using a set of class diagrams for which no operations
are defined.
It defines how an object is associated with another
object
Then objects have specific attributes
Object
Association
Attributes
University of Education Okara

5. 5
A Domain Model is not a Software Artifact
Sale
Date
Time
Sales Database
Sale
Date
Time
Print()
A Conceptual class: Software Artifacts:
vs.
University of Education Okara

6. 6
Steps to create a Domain Model
 Identify Classes
 Add associations necessary to record the
relationships that must be retained
 Add attributes necessary for information to
be preserved
 Apply existing Analysis Patterns
University of Education Okara

7. 7
A Common Mistake - Classes as Attributes
 Exclude irrelevant features
Examples:
 A Store is not an attribute of a Sale
 A Destination is not an attribute of a flight
University of Education Okara

8. 8
Specification or Description
Conceptual Classes
 A Class that records information about an
item.
 Even if all Instances of the item are sold
out, the description remains.
 Avoids duplication of recording the
descriptive information with each instance
of the item.
University of Education Okara

9. 9
Description of a Service
Example (Flight)
Airport
Name
vs.
Flight
Date
Time
Number
Flight
Date
Time
Flight Desc
Date
Time
Airport
Name
Flies-to
Described
-by
Describes
-flights-to
University of Education Okara

10. 9
Description of a Service
Example (Flight)
Airport
Name
vs.
Flight
Date
Time
Number
Flight
Date
Time
Flight Desc
Date
Time
Airport
Name
Flies-to
Described
-by
Describes
-flights-to
University of Education Okara