package dao;

import domain.Student;
import java.util.Collection;
import java.util.SortedMap;
import java.util.TreeMap;

/**
 *
 * @author Mark George
 */
public final class StudentDao {

	private final static SortedMap<String, Student> students = new TreeMap<>();

	public StudentDao() {
		// add some dummy data for testing
		if (students.isEmpty()) {
			addStudent(new Student("1234", "Boris"));
			addStudent(new Student("4321", "Doris"));
		}
	}

	public void addStudent(Student studentToAdd) {
		students.put(studentToAdd.getId(), studentToAdd);
	}

	public void replaceStudent(String id, Student studentToAdd) {
		removeStudent(id);
		students.put(studentToAdd.getId(), studentToAdd);
	}

	public void removeStudent(String id) {
		students.remove(id);
	}

	public Collection<Student> getStudents() {
		return students.values();
	}

	public Student getStudentById(String id) {
		return students.get(id);
	}
}