Implementation of the Add Location functionality

LocationService.java

package io.fantail.location.service;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import javax.ws.rs.BadRequestException;
import javax.ws.rs.InternalServerErrorException;
import javax.ws.rs.NotFoundException;
import javax.ws.rs.ServerErrorException;
import javax.ws.rs.core.Response;

import io.fantail.location.model.Location;

public class LocationService {
	private Map<String, Location> locations;
	
	public LocationService() {
		this(new HashMap<>());
	}

	protected LocationService(Map<String, Location> locations) {
		this.locations = locations;
	}

	public Location getLocation(String id) {
		Location loc = locations.get(id);
		
		if(loc == null) {
			throw new NotFoundException("Location with ID " + id + " not found");
		}
		
		return loc;
	}
	
	public Response addLocation(Location loc) {
		if(loc.getId() != null) {
			throw new BadRequestException("You can't add an exception with an ID");
		}
		
		String id = UUID.randomUUID().toString();
		loc.setId(id);
		locations.put(id, loc);
		
		try {
			return Response.created(new URI(id)).build();
		} catch (URISyntaxException e) {
			throw new InternalServerErrorException("Unexpected error making a URI", e);
		}
	}
}