Part -1:

Objectives: The general aims of the assignment, which consists of two parts, are:

- To analyze a problem in an object-oriented manner, and then design and implement an object-oriented solution that conforms to given specifications
- To practise using inheritance in Java
- To practise file input and output in Java
- To make implementations more robust through mechanisms such as exception han- dling.

Problem Description

In this assignment, which consists of two parts, you will develop a prototype of a patient record system.

A medical clinic needs a system to keep information about their patients and medical observations about the patients. The concept of medical observation is explained below.

- Each patient has a unique patient ID and a name. For each patient, various kinds of medical observations are recorded.
- A medical observation can be measurement such as height, weight, blood pressure, etc. These measurements are referred to as "measurement observations".
- In addition, there are observations that are of non-quantitative nature, for example, the patient's blood type. These observations are referred to as "category observa- tions".
- Each observation type has a name (e.g. "Height" , "Blood type") and a unique code.
- Each measurement observation type has a unit associated with it. Each unit is specified by a name.
- Each category observation type has a number of valid categories associated with. Each category of a category observation type is indentified by a name.

The nurses and doctors who use the system should be able to:

- Add a measurement observation type
- Add a category observation type
- Delete an observation type (which has no associated observations)
- Add a patient
- Add a measurement observation (for a patient)
- Add a category observation (for a patient)
- Modify the value for a measurement observation
- Modify the category for a category observation
- Delete an observation (of a patient)
- Delete a patient (delete all the patient's observation as well)
- Retrieve details of an observation type (given its code)
- Retrieve a patient record by the patient id (including the patient's observations)

In addition (though we will not be concerned with these for Part 1), the nurses and doctors should be able to
- Save all the data
- Load data from the file

Task 1 - Implementing all the classes required to validate the design class diagram

As the first step in the implementation process, it is desirable to validate the design class diagram.

Toward this purpose, you are required to

- Implement the classes in the design class diagram: Patient, ObservationType, MeasurementObservationType, CategoryObservationType, Observation, MeasurementObservation and CategoryObservation.
Include all the necessary attributes and methods, which you need to identify
- Implement a class, called PatientRecordSystem, that manages the data of the pa- tients and their records

Operations required to be supported

For the purpose of validating the design, the PatientRecordSystem class should provide the methods to perform the following operations:

1. Add a measurement observation type
2. Add a category observation type
3. Add a patient
4. Add a measurement observation (for a patient)
5. Add a category observation (for a patient)

For testing purpose, as will be required for Task 2, the PatientRecordSystem should also have a toString method to display all the objects stored in the system.

Task 2 - Testing the PatientRecordSystem class

Test your PatientRecordSystem class with the test program provided in the Appendix.

Your classes should be implemented in such a way that the provided test program can be run without any changes.

Try to make the output of the tests easy to read.

Part -2:

Task 1

Implement two methods for the PatientRecordSystem class to save data and to load data.

The first method, with the header public void saveData() throws Exception will save the data to five text files:

- PRS-MeasurementObservationTypes.txt
This file saves the measurement observation types. A sample is shown below:
T100; Blood Pressure; psi T400; Height; cm
Each measurement observation type is on a separate line. It contain the observation type code, name and unit, separated by semi-colons.
- PRS-CategoryObservationTypes.txt
This file saves the category observation types. A sample is shown below:
T200; Blood Type; Group A, Group B1, Group B2 T300; Stress Level; Low, Medium, High
Each category observation type is on a separate line. It contain the observation type code, name and the categories. The three "fields" (code, the name and the categories) are separated by semi-colons. In the categories fields, the categories are separated by commas.
- PRS-Patients.txt
This file saves the patients's data without their observations. A sample is shown below:
P100; John Smith P200; Anna Bell
Each patient is on a separate line. It contain the patient's id and name, separated by a semi- colon.

- PRS-MeasurementObservations.txt
This file saves the patients's measurement observations. A sample is shown below:
P100; T100; 120.0
P200; T400; 180
Each measurement observation is on a separate line. It contain the patient's id, the observation code and the observation value (a double). The fields are separated by semi-colons.
- PRS-CategoryObservations.txt
This file saves the patients's category observations. A sample is shown below:
P100; T200; Group A P200; T300; Low
Each category observation is on a separate line. It contain the patient's id, the observation code and the observation value (a String). The fields are separated by semi-colons.

The second method, with the header
public void loadData() throws Exception
will read the data from five text files and save them in a PatientRecordSystem instance by calling methods to add measurement observation types, category observation types, etc.

The data should be loaded into a PatientRecordSystem instance which is empty of data.

Of course, you may need to enhance other classes to support the implementation of the saveData and loadData methods.

Also, you should write a small program to test your methods. A sample test program is given in the Appendix 1.

As for Part 1, your implementation must be such that the sample test program can be run without any change.

The sample test program is more or less the bare minimum. You should add more test cases to it.

Task 2

Write the menu program, called PatientRecordSystemMenu, to provide options in the following menu:

=====================
Patient Record System
=====================

1. Add a measurement observation type
2. Add a category observation type
3. Add a patient
4. Add a measurement observation
5. Add a category observation
6. Display details of an observation type
7. Display a patient record by the patient id
8. Save data
9. Load data
D. Display all data for inspection
X. Exit
Please enter an option (1-9 or D or X):

The menu program must use the PatientRecordSystem class developed for Task 1.
For each option, the program should ask for the required inputs, each with a separate prompt.
For option 6, 7 and D, it is acceptable just to use the toString methods of the classes involved (which should have been implemented in Part 1 of the assignment).
See Appendix 2 for a short sample run.
The menu program for this task is only required to satisfy the data correctness conditions. It is not required to be robust, i.e. it can crash when certain exceptions occur.

Task 3- Making the Menu Program Robust

Implement a class called RobustPatientRecordSystemMenu, which extends the previous menu and includes enough exception handling features to make it robust. It is required to be robust only in the following sense: when an exception occurs in the execution of an option, the program will display some information about the exception on the screen and return to the main menu.

Task 4. (For CSE4IOO students only)

This task is not related to the Patient Record System. For the purpose of this task, a string is regarded as having the correct syntax for an email if it satisfies the following conditions:
- Condition 1: It is a sequence of lowercase letters, the period character ('.'), and the @
character
- Condition 2: The @ character must appear once and must appear between two letters
- Condition 3; The period character can appear zero or more times, and it must appear between two letters

Write an EmailChecker class, which has methods with headers:

- public static boolean checkCharacters(String email)
which returns true if Condition 1 is satisfied, and false otherwise
- public static boolean checkAt(String email)
which returns true if Condition 2 is satisfied, and false otherwise
- public static boolean checkDot(String email)
which returns true if Condition 3 is satisfied, and false otherwise
- public static boolean checkEmail(String email)
which returns true if the string has the valid format for an email, and false otherwise.

Submit the EmailChecker and a EmailCheckerTestter class.

(The total mark for Part 2 will be 100 for CSE1IOO students and 110 for CSE4IOO students. The percentage of contribution to the final will be the same.)