valueformatter.java

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/* ============================================================
 * JRobin : Pure java implementation of RRDTool's functionality
 * ============================================================
 *
 * Project Info:  http://www.jrobin.org
 * Project Lead:  Sasa Markovic ([e-mail])
 * 
 * Developers:    Sasa Markovic ([e-mail])
 *                Arne Vandamme ([e-mail])
 *
 * (C) Copyright 2003, by Sasa Markovic.
 *
 * 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.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */
package net.jumperz.ext.org.jrobin.graph;

import java.util.Locale;
import java.text.NumberFormat;
import java.text.DecimalFormat;

/**
 * <p>A <code>ValueFormatter</code> object is used to convert double values to a formatted string.  
 * The value can be scaled according to a specific base value (default: 1000) and an appropriate
 * SI unit can be selected (k, M, G...).</p>
 * 
 * @author Arne Vandamme ([e-mail])
 * @author Sasa Markovic ([e-mail])
 */
class ValueFormatter 
{
	// ================================================================
	// -- Members
	// ================================================================	
	protected static final int NO_SCALE 		= -1;
	protected static final double DEFAULT_BASE	= 1000.0;
	
	private double base							= DEFAULT_BASE;
	private double[] scaleValues				= new double[] {
													1e18, 1e15, 1e12, 1e9, 1e6, 1e3, 1e0, 1e-3, 1e-6, 1e-9, 1e-12, 1e-15
													};
	protected static String[] PREFIXES 			= new String[] {
													"E",  "P",  "T",  "G", "M", "k", " ",  "m", "