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Java > Open Source Codes > jcckit > util > Util


1 /*
2  * Copyright 2003-2004, Franz-Josef Elmer, All rights reserved
3  *
4  * This library is free software; you can redistribute it and/or modify
5  * it under the terms of the GNU Lesser General Public License as published by
6  * the Free Software Foundation; either version 2.1 of the License, or
7  * (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12  * GNU Lesser General Public License for more details
13  * (http://www.gnu.org/copyleft/lesser.html).
14  *
15  * You should have received a copy of the GNU Lesser General Public License
16  * along with this library; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19 package jcckit.util;
20
21 /**
22  * Collection of static utility methods.
23  *
24  * @author Franz-Josef Elmer
25  */
26 public class Util {
27   /** Private constructor to prevent instanciation of this class. */
28   private Util() {}
29
30   /**
31    * Returns the natural logarithm of the specified number if
32    * <tt>logScale</tt> is true.
33    * @return <tt>x</tt> if <tt>logScale == false</tt>.
34    */
35   public static double log(double x, boolean logScale) {
36     return logScale ? Math.log(x) : x;
37   }
38
39   /**
40    * Returns the exponential function of the specified number if
41    * <tt>logScale</tt> is true.
42    * @return <tt>x</tt> if <tt>logScale == false</tt>.
43    */
44   public static double exp(double x, boolean logScale) {
45     return logScale ? Math.exp(x) : x;
46   }
47 }
48
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