gistfile1.java

private void submitSolution(String[] tokens) {
		if(tokens.length == 4) {
			
			if(!isValidNumber(tokens[1])) {
				System.err.println("Error! Invalid task ID.");
				return;
			}
			
			if(!isValidMatrNo(tokens[2])) {
				System.err.println("Error! Invalid matrNo.");
				return;
			}
			
			int matrNo = Integer.parseInt(tokens[2]);
			int taskID = Integer.parseInt(tokens[1]);
			String text = tokens[3];
			
			if(!praktomat.containsTask(taskID)) {
				System.err.println("Error! Task does not exist.");
				return;
			}
			
			if(!praktomat.containsStudent(matrNo)) {
				System.err.println("Error! Student does not exist.");
				return;
			}
			
			Task task = praktomat.getTask(taskID);
			Student student = praktomat.getStudent(matrNo);

			if(!praktomat.submitSolution(student, text, task)) {
				System.err.println("Error! There's already a solution for this task.");
			}
		} else {
			System.err.println("Error! Invalid parameter count for command 'submit'");
		}

	}