1 /*
2 * (c) Copyright 2006-2020 by rapiddweller GmbH & Volker Bergmann. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, is permitted under the terms of the
6 * GNU General Public License.
7 *
8 * For redistributing this software or a derivative work under a license other
9 * 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 rapiddweller GmbH & 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 com.rapiddweller.benerator.distribution.sequence;
28
29 import com.rapiddweller.benerator.GeneratorContext;
30 import com.rapiddweller.benerator.primitive.number.AbstractNonNullNumberGenerator;
31
32 /**
33 * Double Generator that implements a 'step' Double Sequence.<br/>
34 * <br/>
35 * Created: 26.07.2007 18:36:45
36 *
37 * @author Volker Bergmann
38 */
39 public class StepDoubleGenerator extends AbstractNonNullNumberGenerator<Double> {
40
41 private final double increment;
42 private final double initial;
43
44 private double next;
45
46 // constructors ----------------------------------------------------------------------------------------------------
47
48 /**
49 * Instantiates a new Step double generator.
50 */
51 public StepDoubleGenerator() {
52 this(Double.MIN_VALUE, Double.MAX_VALUE);
53 }
54
55 /**
56 * Instantiates a new Step double generator.
57 *
58 * @param min the min
59 * @param max the max
60 */
61 public StepDoubleGenerator(double min, double max) {
62 this(min, max, 1., null);
63 }
64
65 /**
66 * Instantiates a new Step double generator.
67 *
68 * @param min the min
69 * @param max the max
70 * @param increment the increment
71 */
72 public StepDoubleGenerator(double min, double max, double increment) {
73 this(min, max, increment, null);
74 }
75
76 /**
77 * Instantiates a new Step double generator.
78 *
79 * @param min the min
80 * @param max the max
81 * @param increment the increment
82 * @param initial the initial
83 */
84 public StepDoubleGenerator(double min, Double max, double increment, Double initial) {
85 super(Double.class, min, max, Math.abs(increment));
86 this.increment = increment;
87 this.initial = (initial != null ? initial : (increment >= 0 ? min : max));
88 reset();
89 }
90
91 // properties ------------------------------------------------------------------------------------------------------
92
93 @Override
94 public void init(GeneratorContext context) {
95 assertNotInitialized();
96 resetMembers();
97 super.init(context);
98 }
99
100 @Override
101 public Double generate() {
102 assertInitialized();
103 if (increment == 0 || (increment > 0 && (max == null || next <= max)) || (increment < 0 && next >= min)) {
104 double value = next;
105 next += increment;
106 return value;
107 } else {
108 return null;
109 }
110 }
111
112 @Override
113 public synchronized void reset() {
114 resetMembers();
115 }
116
117 private void resetMembers() {
118 next = initial;
119 }
120
121 }