Describing Classes with UML

• UML or the Unified Modeling Language
• A general purpose modeling language
• Provides a standard way to visualize the design of a system.
• There are many different types of diagrams in UML
• We will focus on Class Diagrams for now.
• Class Diagrams show the structure of a system's classes.
• A class is represented by a box with three compartments
  • The class name, generally CamelCase
  • The class attributes
    • The data fields
    • name, camelCase
    • attribute type (Optional)
  • Operations
    • Class methods
    • Name
    • Parameters (optional)
    • type of value returned.
  • Attributes and operations can show visibility
    • Starting with a + means an item is public.
    • Starting with a - means an item is private.
    • Starting with a # means protected visibility.
      • Subclasses have access to this item
• Consider a die
  • It has a number of sides.
  • It has a current value.
  • You can roll a die.
  • You can Check the value.
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• I am using a package called UMLet
• Or the on line version UMLetino
  • This is a free package that is installed in our lab.
  • Do a demo, create the die.
• A Stereotype
  • Allows modification of UML.
  • We need to create a new UML class to model Rolls
  • So we will use a stereotype.
  • Use << name >>
  • 
  • Then list the values.
  • I added the "methods" or functions available for this enumerated type.
• The Roll and Disaster Enumerations
  • We could just string representation for the roll types and disaster types.
    • But there is too much chance that I will spell a string wrong in comparisons
    • And it takes too much space
    • And it is not centralized
  • Disasters are pictured above.
  • Some rolls are not modified, but I think we should include them for future expansion.
    • The tables use "Get +1 to Build Rolls"
    • But there is no actual build roll in the document.
    • I assume that this is the "Resource Roll" as resource points are used to build cities and wonders.
    • So "Build" and "Resource" should both acceptable strings for this roll type.
    • But the word "Build" should be output for the equivalent string.
  • In both cases, there should be the following routines
    • Convert a string to an enumerated value.
    • Convert an enumerated value to a string.
    • Overload the stream insertion operator to allow printing of the associated string.
  • 
• A note on implementation
  • You will use Strongly Typed Enumerations to implement the two above classes.
  • Page 14-15 of your book gives a discussion and an example.
  • These are from c++11
  • You can look up the documentation on line, but this code might help.