Taxi Company

Develop an application to manage a taxi company.
All the classes must belong to package taxi. Use the class MainClass as an example.

R1. Companies and Taxi

A taxi company is represented by the class TaxiCompany.
Taxis are represented by the class Taxi, that provides a constructor accepting the unique id of the taxi.
The method toString() from class Taxi returns the identifier of the taxi.
The method addTaxi (String id) from class TaxiCompany allows adding a new item to the taxi list of a company; if the identifier is already present, it raises an InvalidTaxiName exception.
When a new taxi is added to a company, it is inserted at the end of the available taxis queue.
The method getAvailable() returns the free taxis queue.

R2. Places and Passengers

The class Place represents a real address and provides a constructor accepting as arguments the actual address and the relative district (or quarter) name. (E.g.: "Corso Duca Abruzzi 24", "crocetta").
The method toString() returns the address of the place.
The class Passenger represents a customer of the taxi company, it provides a constructor accepting as argument the place where the customer is located currently, i.e. where he/she should be picked up by a taxi
The method getPlace() returns the place where the passenger is currently located.

R3. Taxi Management

Taxi management will be handled with a First-In-First-Out strategy by means of a queue containing the available taxis.
The method callTaxi(Passenger p) assigns the first taxi in the available queue to the passenger passed as argument and returns the taxi itself; if no taxi is available then the call is lost.
The method getLostTrips() returns the total number of lost calls.
The class Taxi provides the methods for initiating and terminating a taxi trip:

a taxi, once assigned to a passenger, can initiate its trip by means of method beginTrip(Place dest), that accepts the destination as argument, while the departure place is represented by the current passenger position.
the trip terminates with the method terminateTrip() that assigns to the passenger the destination place and puts the taxi at the end of the available taxis queue.

R4. Trips

The class Trip represents a trip completed by a taxi. The method toString() returns a string containing the departure and arrival addresses, separated by a comma (',').
The method getTrips(String id) of the class TaxiCompany returns a list containing all the trips completed by the taxi identified by the argument in chronological order; if the identifier is not present in the list of taxis working for the company then it raises an InvalidTaxiName exception.

R5. Statistics

Class TaxiCompany provides two methods used to retrieve statistics:

the method statsTaxi() returns the list of taxis (through the interface InfoI) sorted by decreasing number of completed trips (those for which the terminateTrip() method has been invoked); in case of tie use the alphabetic order of the id.
the method statsDistricts() returns the list of districts that have been destination of at least a trip (through the interface InfoI), sorted by decreasing number of trips having that district as the destination; in case of ties use the alphabetic order of the district.