1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2013, by Object Refinery Limited and Contributors.
6  *
7  * Project Info:  http://www.jfree.org/jfreechart/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
22  * USA.
23  *
24  * [Oracle and Java are registered trademarks of Oracle and/or its affiliates.
25  * Other names may be trademarks of their respective owners.]
26  *
27  * ----------------
28  * ParamChecks.java
29  * ----------------
30  * (C) Copyright 2011, by Object Refinery Limited.
31  *
32  * Original Author:  David Gilbert (for Object Refinery Limited);
33  * Contributor(s):   -;
34  *
35  * Changes
36  * -------
37  * 16-Oct-2011 : Version 1 (DG);
38  *
39  */
40 
41 package org.jfree.chart.util;
42 
43 /**
44  * A utility class for checking parameters.
45  *
46  * @since 1.0.14
47  */
48 public class ParamChecks {
49 
50     /**
51      * Throws an <code>IllegalArgumentException</code> if the supplied
52      * <code>param</code> is <code>null</code>.
53      *
54      * @param param  the parameter to check (<code>null</code> permitted).
55      * @param name  the name of the parameter (to use in the exception message
56      *     if <code>param</code> is <code>null</code>).
57      *
58      * @throws IllegalArgumentException  if <code>param</code> is
59      *     <code>null</code>.
60      *
61      * @since 1.0.14
62      */
nullNotPermitted(Object param, String name)63     public static void nullNotPermitted(Object param, String name) {
64         if (param == null) {
65             throw new IllegalArgumentException("Null '" + name + "' argument.");
66         }
67     }
68 }
69