01: /*
02: * (c) Copyright 2006 by Volker Bergmann. All rights reserved.
03: *
04: * Redistribution and use in source and binary forms, with or without
05: * modification, is permitted under the terms of the
06: * GNU General Public License.
07: *
08: * For redistributing this software or a derivative work under a license other
09: * than the GPL-compatible Free Software License as defined by the Free
10: * Software Foundation or approved by OSI, you must first obtain a commercial
11: * license to this software product from Volker Bergmann.
12: *
13: * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
14: * WITHOUT A WARRANTY OF ANY KIND. ALL EXPRESS OR IMPLIED CONDITIONS,
15: * REPRESENTATIONS AND WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF
16: * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE
17: * HEREBY EXCLUDED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
18: * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24: * POSSIBILITY OF SUCH DAMAGE.
25: */
26:
27: package org.databene.benerator;
28:
29: import java.util.Random;
30:
31: /**
32: * Provides utility functions for generating numbers in an interval.<br/>
33: * <br/>
34: * Created: 03.09.2006 13:23:02
35: */
36: public class SimpleRandom {
37:
38: /** The basic random provider */
39: private static Random random = new Random();
40:
41: /** Generates a random long value in the range from min to max */
42: public static long randomLong(long min, long max) {
43: if (min > max)
44: throw new IllegalArgumentException("min > max: " + min
45: + " > " + max);
46: long range = max - min + 1;
47: long result;
48: if (range != 0)
49: result = min + (random.nextLong() % range);
50: else
51: result = random.nextLong();
52: if (result < min)
53: result += range;
54: return result;
55: }
56:
57: /** Generates a random int value in the range from min to max */
58: public static int randomInt(int min, int max) {
59: if (min > max)
60: throw new IllegalArgumentException("min > max: " + min
61: + " > " + max);
62: int range = max - min + 1;
63: int result;
64: if (range != 0)
65: result = min + (random.nextInt() % range);
66: else
67: result = random.nextInt();
68: if (result < min)
69: result += range;
70: return result;
71: }
72:
73: public static <T> T randomValue(T... values) {
74: return values[randomInt(0, values.length)];
75: }
76: }
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