This is a program that takes parses a CSV file of the format
cookie,UTC Timestamp
and returns the most frequent cookies on a specific date to standard out.
The program takes three command line arguments:
- A file name
- -d
- UTC time
To use the program, first compile it with the command javac Cookie.java. You
can then run the program using java Cookie $FILE -d $TIME. For example, the
command:
java Cookie most_active_cookie_log.csv -d 2018-12-08
Given a sample CSV file:
cookie,timestamp
AtY0laUfhglK3lC7,2018-12-09T14:19:00+00:00
SAZuXPGUrfbcn5UA,2018-12-09T10:13:00+00:00
5UAVanZf6UtGyKVS,2018-12-09T07:25:00+00:00
AtY0laUfhglK3lC7,2018-12-09T06:19:00+00:00
SAZuXPGUrfbcn5UA,2018-12-08T22:03:00+00:00
4sMM2LxV07bPJzwf,2018-12-08T21:30:00+00:00
fbcn5UAVanZf6UtG,2018-12-08T09:30:00+00:00
4sMM2LxV07bPJzwf,2018-12-07T23:30:00+00:00
The above command will produce:
fbcn5UAVanZf6UtG
SAZuXPGUrfbcn5UA
4sMM2LxV07bPJzwf
The program first checks to see whether or not the command line arguments are in the correct format and then if the input file exists. If everything is determined to be correct, then the program will take the input file, read in line by line and check whether the current line’s date matches the given input date. If it does, add to that cookie’s frequency on the given date (using a hashmap), and keep track of the maximum frequency of all the cookies on that date. Once the input date has been processed, loop through all the input dates and print any that have an input matching the maximum frequency.
- [ ] Add tests
- [ ] Add build framework
- [ ] Add more rigorous input verification
- [ ] Figure out if there is a more efficient way to search for the given dates in the csv file (load the whole file then perform a binary search?)
- [ ] Split program into functions/compartmentalize code