Useful enum for file size calculations.

Size

/**
 * Useful for disk file size calculations. [eaorak]
 */
public enum Size {

	BY, // Bytes
	KB, // Kilo
	MB, // Mega
	GB, // Giga
	TB, // Tera
	PB; // Peta

	private long size;

	private Size() {
		this.size = (long) Math.pow(1024, this.ordinal());
	}

	public long size() {
		return this.size;
	}

	public long asBytes(int amount) {
		return this.as(Size.KB, amount);
	}

	public long asMb(int amount) {
		return this.as(Size.MB, amount);
	}

	public long asGb(int amount) {
		return this.as(Size.GB, amount);
	}

	public long asTb(int amount) {
		return this.as(Size.TB, amount);
	}

	private long as(Size size, int amount) {
		return (this.size * amount) / size.size;
	}

	public static void main(String[] args) {
		for (Size s : Size.values()) {
			System.out.println(s.name() + ":" + s.size);
		}
	}

}