1. Unified Modeling Language (UML)

2. UML
UML provides many different types of diagrams that can be used to document object-oriented designs
We will focus on just two diagram types
Class Diagrams
Sequence Diagrams
Class Diagrams show all of the classes in the system and the relationships between them (static)
Sequence Diagrams show how objects collaborate in order to implement the functionality of the system (dynamic, runtime)

3. Class Diagrams - Classes
Class Name
- attrName1 : type1
+ attrName2 : type2
# attrName3 : type3
Attributes
- opName1(in param1 : type1, out param2 : type2) : returntype
+ opName2(inout param3 : type3)
# opName3() : returntype
Operations
- private
+ public
# protected
Parameter types: in, out, inout

4. Class Diagrams - Classes
Order
- number : string
- dateReceived : Date
- customer : Customer
- lineItems : OrderLine[]
+ Order(in num : string, in received : Date, in cust : Customer)
+ ~Order()
+ GetNumber() : string
+ GetDateReceived() : Date
+ GetCustomer() : Customer
+ AddLineItem(in item : OrderLine)
+ GetLineItems() : OrderLine[]
+ GetPrice() : Money
+ Dispatch()
+ Close()

5. Class Diagrams - Associations
A line between two classes represents an association or relationship between the classes
You can navigate from one class to another only if there is an arrowhead in that direction.
The triangle represents inheritance
An order belongs to one customer
A customer may have any number
of orders
An order may have any number of
order lines
An order line belongs to one order
An order line has one product
A product may be associated with
any number of order lines
A corporate customer has zero or
one employees assigned to them
An employee may be assigned to any number of corporate customers

6. Class Descriptions Class: Order
Purpose: Represents an order placed by a customer
Attributes
- number : string
The order's unique number
- dateReceived : Date
The date on which the order was received
Operations
+ Order(in num : string, in received : Date, in cust : Customer)
Constructor for the Order class
num: the order's unique number
received: the date the order was received
cust: the customer that made the order
returns: nothing

7. Sequence Diagrams

8. Sequence Diagrams

9. Web Crawler Designs
Your web crawler design should include the following
UML Class Diagram
Class Description for each class
UML Sequence Diagram
Acceptable Formats
RTF
HTML
PDF
Dia Format (Linux drawing program)

10. Dia Demo