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@RequestMapping(value= "/employee/{id}", method= RequestMethod.GET)
	public Employee getEmployeeById(@PathVariable int id) throws Exception {
		System.out.println(this.getClass().getSimpleName() + " - Get employee details by id is invoked.");

		Optional<Employee> emp =  service.getEmployeeById(id);
		if(!emp.isPresent())
			throw new Exception("Could not find employee with id- " + id);

		return emp.get();
	}

	@RequestMapping(value= "/employee/add", method= RequestMethod.POST)
	public Employee createEmployee(@RequestBody Employee newemp) {
		System.out.println(this.getClass().getSimpleName() + " - Create new employee method is invoked.");
		return service.addNewEmployee(newemp);
	}

	@RequestMapping(value= "/employee/update/{id}", method= RequestMethod.PUT)
	public Employee updateEmployee(@RequestBody Employee updemp, @PathVariable int id) throws Exception {
		System.out.println(this.getClass().getSimpleName() + " - Update employee details by id is invoked.");

		Optional<Employee> emp =  service.getEmployeeById(id);
		if (!emp.isPresent())
			throw new Exception("Could not find employee with id- " + id);

		/* IMPORTANT - To prevent the overiding of the existing value of the variables in the database, 
		 * if that variable is not coming in the @RequestBody annotation object. */		
		if(updemp.getName() == null || updemp.getName().isEmpty())
			updemp.setName(emp.get().getName());
		if(updemp.getDepartment() == null || updemp.getDepartment().isEmpty())
			updemp.setDepartment(emp.get().getDepartment());
		if(updemp.getSalary() == 0)
			updemp.setSalary(emp.get().getSalary());

		// Required for the "where" clause in the sql query template.
		updemp.setId(id);
		return service.updateEmployee(updemp);
	}

	@RequestMapping(value= "/employee/delete/{id}", method= RequestMethod.DELETE)
	public void deleteEmployeeById(@PathVariable int id) throws Exception {
		System.out.println(this.getClass().getSimpleName() + " - Delete employee by id is invoked.");

		Optional<Employee> emp =  service.getEmployeeById(id);
		if(!emp.isPresent())
			throw new Exception("Could not find employee with id- " + id);

		service.deleteEmployeeById(id);
	}

	@RequestMapping(value= "/employee/deleteall", method= RequestMethod.DELETE)
	public void deleteAll() {
		System.out.println(this.getClass().getSimpleName() + " - Delete all employees is invoked.");
		service.deleteAllEmployees();
	}
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