package sudoku;

/**
 * The enumeration type of all possible values of a Sudoku field.
 */
public enum Value {
    ONE(1), TWO(2), THREE(3), FOUR(4), FIVE(5), SIX(6), SEVEN(7), EIGHT(8), NINE(9);

    private final int id;

    Value(int id) {
        this.id = id;
    }

    /**
     * Returns a string representation of this value. As a matter of fact, its id is returned.
     *
     * @return a string representation of this value.
     */
    @Override
    public String toString() {
        return String.valueOf(id);
    }

    /**
     * Returns the value with the specified id.
     *
     * @param id an id (1 <= id <= 9)
     * @return the value with the specified id.
     */
    public static Value of(int id) {
        return values()[id - 1];
    }

    /**
     * Returns the id of this instance.
     *
     * @return the id of this instance.
     */
    public int getId() {return id;}
}