org.rzo.yajsw.tray.ByteFormat Maven / Gradle / Ivy

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YAJSW is a java centric implementation of the java service wrapper by tanuki (JSW). It aims at being mostly configuration compliant with the original. It should therefore be easy to switch from JSW to YAJSW.

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/* This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.  
 */
package org.rzo.yajsw.tray;

/**
 * taken from
 * http://groups.google.com/group/comp.lang.java.help/browse_thread/thread
 * /0db818517ca9de79/b0a55aa19f911204 thanks to Piotr Kobzda Formatter for Bytes
 */
public class ByteFormat
{
	/**
	 * The Enum StorageUnit.
	 */
	public enum StorageUnit
	{

		/** The BYTE. */
		BYTE("B", 1L),
		/** The KILOBYTE. */
		KILOBYTE("KB", 1L << 10),
		/** The MEGABYTE. */
		MEGABYTE("MB", 1L << 20),
		/** The GIGABYTE. */
		GIGABYTE("GB", 1L << 30),
		/** The TERABYTE. */
		TERABYTE("TB", 1L << 40),
		/** The PETABYTE. */
		PETABYTE("PB", 1L << 50),
		/** The EXABYTE. */
		EXABYTE("EB", 1L << 60);

		/** The Constant BASE. */
		public static final StorageUnit	BASE	= BYTE;

		private final String			symbol;
		private final long				divider;		// divider of BASE unit

		/**
		 * Instantiates a new storage unit.
		 * 
		 * @param name
		 *            the name
		 * @param divider
		 *            the divider
		 */
		StorageUnit(String name, long divider)
		{
			this.symbol = name;
			this.divider = divider;
		}

		/**
		 * Of.
		 * 
		 * @param number
		 *            the number
		 * 
		 * @return the storage unit
		 */
		public static StorageUnit of(final long number)
		{
			final long n = number > 0 ? -number : number;
			if (n > -(1L << 10))
			{
				return BYTE;
			}
			else if (n > -(1L << 20))
			{
				return KILOBYTE;
			}
			else if (n > -(1L << 30))
			{
				return MEGABYTE;
			}
			else if (n > -(1L << 40))
			{
				return GIGABYTE;
			}
			else if (n > -(1L << 50))
			{
				return TERABYTE;
			}
			else if (n > -(1L << 60))
			{
				return PETABYTE;
			}
			else
			{ // n >= Long.MIN_VALUE
				return EXABYTE;
			}
		}
	}

	/**
	 * Format.
	 * 
	 * @param number
	 *            the number of bytes
	 * 
	 * @return the formatted string
	 */
	public String format(long number)
	{
		StorageUnit st = StorageUnit.of(number);
		return nf.format((double) number / st.divider) + " " + st.symbol;
	}

	private static java.text.NumberFormat	nf	= java.text.NumberFormat.getInstance();
	static
	{
		nf.setGroupingUsed(false);
		nf.setMinimumFractionDigits(0);
		nf.setMaximumFractionDigits(1);
	}

}