Lab 6: Composite and Iterator Patterns

Objectives

During this lab session:

Students will modify and/or extend C# code that implements the Composite and Iterator patterns.

This activity helps the student develop the following skills, values and attitudes: ability to analyze and synthesize, capacity for identifying and solving problems, and efficient use of computer systems.

Activity Description

This lab is based on chapter 9 of [FREEMAN] and chapter 7 of [ALBAHARI]. It can be developed individually or in pairs.

The file menuiterator.zip contains the Java source code for the example on pages 360 to 375 of [FREEMAN]. Translate the Java code into C#, with the following considerations:

All the source files you produce should be placed in a folder called chapter09.
All methods that print something to the standard output (using System.out.print or System.out.println) should instead return a string. Returning strings rather than displaying values simplifies unit testing.

In other words, a Java method like this:
```
void sayHello() {
    System.out.println("Hi!");
}
```
should be rewritten in C# as:
```
string SayHello() {
    return "Hi!" + Environment.NewLine;
}
```
Note that if you need an end of line terminator, you should use the System.Environment.NewLine property.
Use C#'s List<T> class when converting from Java's ArrayList class.
The C# equivalent of Java's Iterator interface is IEnumerator. You'll need to rename and adjust your code accordingly. For the CompositeIterator class, have it implement the generic IEnumerator<T> interface.
The MenuComponent class should implement the IEnumerable<T> interface. The GetEnumerator method should take the place of the createIterator method.
Use the foreach statement instead of the while statement to iterate over each element contained in an enumerable object.
Use System.NotSupportedException in C# when the Java code uses UnsupportedOperationException.
Convert the MenuTestDriva Java class into an NUnit test class. The expected "output" (returned strings) should be verified using Assert.AreEqual.
For any other issues not considered here, do some research and use your own discretion in order to solve them.

Deliverables

To hand in your lab work, follow these instructions:

Create a readme.txt text file that includes the name and student ID of the authors. Copy this file to the chapter09 folder.
Create a ZIP file with the full contents of the chapter09 directory. Call this file chapter09.zip.
Using the Online Assignment Delivery System (SETA), deliver the ZIP file. Due date is Monday, March 9.

Evaluation

This activity will be evaluated using the following criteria:

100	The code works as requested.
60-90	The code works, but has some flaws.
20-50	The code doesn't work, but it seams that some amount of time was spent on it.
DA	The program was plagiarized.

Software Design and Architecture

Lab 6: Composite and Iterator Patterns

Objectives

Activity Description

Deliverables

Evaluation