RootKata

How to run the application

In any terminal, Clone this repo:

git clone https://github.com/gharraph/RootKata.git

Change directory to:

RootKata/src/main/java

run the following command to compile the code :

javac  RootKata/DrivingHistoryApp.java

run the following command to run the application:

java RootKata/DrivingHistoryApp testFile.txt

please note that I included a test file with the application for testing. You can include any other files in the same directory, and replace the testFile.txt argurment with the name of the new file.
To run unit tests, change directory to RootKata (root folder for the project). run the following command:

./gradlew test

Solution Analysis:

To parse the input file I chose HashMap data structure with Driver name as the key for the map, and list of trips as the value for each driver.

{
  "Alex":[<trip:startTime, endTime, milesDriven>, <trip:startTime, endTime, milesDriven>], 
  "Dan":[<trip:startTime, endTime, milesDriven>], 
  "Bob":[]
}

This helped associating all trips to their driver owner. I chose the driver name as the key, but in real application I would recommend driver identifier as the key, however, given the input file in the exercise problem the driver name will suffice.
Used Junit 4 with Hamcrest matchers for unit testing.
Object used in my solutions are: Trip, and DriverSummaryRecord. I would typicaly use an object for driver, but, as the problem is simple enough using only driver first name, String object suffice.
The parser class is static class, as it does not have any state.
I did not need to use any mocking frawork as problem is simple, as most of the logic are in the parser class.
For simplicity I used LocalTime library for the start and end time of the trips.
I had to use comparator class to output driver summary record in the order specified.