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Assessed Coursework
Course Name Object Oriented Software Engineering
Coursework Number 2
Deadline Time: 4:30pm Date: 19
th March 2021
% Contribution to final
course mark
10%
Solo or Group ? Solo solo Group
Anticipated Hours
Submission Instructions Submit via Moodle
Please Note: This Coursework cannot be Re-Assessed
Code of Assessment Rules for Coursework Submission
Deadlines for the submission of coursework which is to be formally assessed will be published in course
documentation, and work which is submitted later than the deadline will be subject to penalty as set out below.
The primary grade and secondary band awarded for coursework which is submitted after the published deadline will
be calculated as follows:
(i) in respect of work submitted not more than five working days after the deadline
a. the work will be assessed in the usual way;
b. the primary grade and secondary band so determined will then be reduced by two secondary bands
for each working day (or part of a working day) the work was submitted late.
(ii) work submitted more than five working days after the deadline will be awarded Grade H.
Penalties for late submission of coursework will not be imposed if good cause is established for the late submission.
You should submit documents supporting good cause via MyCampus.
Penalty for non-adherence to Submission Instructions is 2 bands
You must complete an “Own Work” form via https://studentltc.dcs.gla.ac.uk/
for all coursework
Object Oriented Software Engineering
Assessed Exercise 2
Visitors Design Pattern with JavaParser
Objective
In this coursework, you will learn how to use the software framework called JavaParser
and its documentation to build a static analyser. You will also understand how the visitor
design pattern is applied in the implementation of such framework. This objective will be
evaluated based on your ability to extend the VoidVisitorAdapter in JavaParser. This
is to implement concrete detectors that traverses an Abstract Syntax Tree representation
of a program code using the visitors design pattern. [Total Marks: 100, Task 1: 60
marks, Task 2: 30 marks, Deliverable form: 10 marks]
Setup
Create a simple maven project without archtype using eclipse IDE. For Eclipse 2020-12
you can navigate to File, New, Other..., Maven, Maven Project:
1. ? Check create a simple project (skip archetype selection).
? Enter Group Id = oose.coursework2
? Artifact Id= coursework2
? Name = coursework2
? Click on pom.xml file generated and Include the following dependency:


com.github.javaparser
javaparser-core
3.12.0


2. Create a package called detectors to contain the four java classes for Tasks 1 and
2 highlighted below.
2
Task 1: (60 Marks)
A control flow statement in a method is characterised as a useless control flow when
the control flow continues onto the same place regardless of whether or not the branch is
taken. For example, having an empty statement block for an if statement:
if (argv.length == 1);
System.out.println( argv[0]);
if (argv.length == 0) {
// TODO: handle this case
}
Other forms of control flows should be also considered, namely for, while, do... while
and switch.
Using the visitors design pattern, create the class UselessControlFlowDetector.java
that detects useless control flow in java program code. Create a container class called
Breakpoints.java to collect this observed behaviour as the visit method(s) implemented
in detector transverses through the program structure. Finally, implement the
class Driver.java that instantiates the detector and provides it with program code to
operate on. Driver.java should print each detected pattern to command line in the
format:
Useless Control Flows:
className =?, methodName =?, startline =?, endline =?
className =?, methodName =?, startline =?, endline =?
...
Task 2: (30 Marks)
Recursion is a programming technique of making a function calling itself. Polymorphic
recursion is a property of a program code where the parameter types of a method
may change with each recursive invocation. For example, the methods named method1
in Test.java below implement polymorphic recursion. Here, both recursion and polymorphic
recursion should be detected, independtly of the number of parameters and their
types.
class Test{
int x;
public void method1(String args[]){
method1(args);
3
}
public void method1(String args[],int x, Test t){
this.x =1;
method1(args);
}
}
Using the visitors design pattern, create the class RecursionDetector.java that detects
polymorphic recursion in java program code. Use the container Breakpoints.java
to collect observed recursive behaviour as the visit method(s) implemented in detector
transverses through the program structure. Also extend Driver.java to instantiate
this detector and provide it with program code to operate on. Finally, the output of
Driver.java for detected behaviour should be similar to Task 1, by printing the class
and method name, and also start and end line of observed pattern to command line. in
the format:
Recursions:
className =?, methodName =?, startline =?, endline =?
className =?, methodName =?, startline =?, endline =?
...
Hints
? You may need to reference JavaParser’s documentation which is available at: http:
//www.javadoc.io/doc/com.github.javaparser/javaparser-core/3.12.0
? You may find the tool AstVisualizer - for visualising Abstract Syntax Trees of java
programs useful for understanding the structure of that matches a desired behaviour.
This tool can be downloaded from OOSE Moodle webpage.
? Finally, we will use Calculator.java that is available on Moodle to test your
solutions. For example, we may refactor Calculator.java to introduce recursion
or change the control flow to match a desired pattern. We assume there are no
nested classes.
? We will also check the clarity of your solution, documentation and the extent it
satisfies the SOLID software design principles.
Deliverables
Submission should be made electronically via Moodle for Assessed Coursework 2.
4
1. Attach your zipped maven project with your solutions to Task1 and Task2. State
your name and registration number at the top of UselessControlFlowDetector.java,
RecursionDetector.java, Breakpoints.java and Driver.java.
2. A runnable jar file of your project that is able to be executed from command line
with the file path and name passed as argument (10 marks). For example:
java -jar coursework2.jar ”C:\...\calculator.java”
Assessment
Submission is due by 16:30 on 19th March 2021. You should submit your solution
through the class Moodle page.
Tutors and demonstrators will be in your allocated Lab to offer assistance. You should
endeavour to attend each lab so you can get the necessary help.
As per the Code of Assessment policy regarding late submissions, submissions will
be accepted for up to 5 working days beyond the due date. Any late submissions will
be marked as if submitted on time, but reduced by 2 marks for each additional day.
Submissions received more than 5 working days after the due date will receive an H (band
value of 0).
Dr Fani Deligianni (fani.deligianni@glasgow.ac.uk), 321b Sir Alwyn Williams Building, School of
Computing Science, University of Glasgow

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