1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18 package org.apache.commons.math4.legacy.ode.sampling;
19
20
21 import java.io.ByteArrayInputStream;
22 import java.io.ByteArrayOutputStream;
23 import java.io.IOException;
24 import java.io.ObjectInputStream;
25 import java.io.ObjectOutputStream;
26
27 import org.apache.commons.math4.legacy.exception.MaxCountExceededException;
28 import org.apache.commons.math4.core.jdkmath.JdkMath;
29 import org.junit.Assert;
30 import org.junit.Test;
31
32 public class DummyStepInterpolatorTest {
33
34 @Test
35 public void testNoReset() throws MaxCountExceededException {
36
37 double[] y = { 0.0, 1.0, -2.0 };
38 DummyStepInterpolator interpolator = new DummyStepInterpolator(y, new double[y.length], true);
39 interpolator.storeTime(0);
40 interpolator.shift();
41 interpolator.storeTime(1);
42
43 double[] result = interpolator.getInterpolatedState();
44 for (int i = 0; i < result.length; ++i) {
45 Assert.assertTrue(JdkMath.abs(result[i] - y[i]) < 1.0e-10);
46 }
47 }
48
49 @Test
50 public void testFixedState() throws MaxCountExceededException {
51
52 double[] y = { 1.0, 3.0, -4.0 };
53 DummyStepInterpolator interpolator = new DummyStepInterpolator(y, new double[y.length], true);
54 interpolator.storeTime(0);
55 interpolator.shift();
56 interpolator.storeTime(1);
57
58 interpolator.setInterpolatedTime(0.1);
59 double[] result = interpolator.getInterpolatedState();
60 for (int i = 0; i < result.length; ++i) {
61 Assert.assertTrue(JdkMath.abs(result[i] - y[i]) < 1.0e-10);
62 }
63
64 interpolator.setInterpolatedTime(0.5);
65 result = interpolator.getInterpolatedState();
66 for (int i = 0; i < result.length; ++i) {
67 Assert.assertTrue(JdkMath.abs(result[i] - y[i]) < 1.0e-10);
68 }
69 }
70
71 @Test
72 public void testSerialization()
73 throws IOException, ClassNotFoundException, MaxCountExceededException {
74
75 double[] y = { 0.0, 1.0, -2.0 };
76 DummyStepInterpolator interpolator = new DummyStepInterpolator(y, new double[y.length], true);
77 interpolator.storeTime(0);
78 interpolator.shift();
79 interpolator.storeTime(1);
80
81 ByteArrayOutputStream bos = new ByteArrayOutputStream();
82 ObjectOutputStream oos = new ObjectOutputStream(bos);
83 oos.writeObject(interpolator);
84
85 Assert.assertTrue(bos.size () > 300);
86 Assert.assertTrue(bos.size () < 500);
87
88 ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
89 ObjectInputStream ois = new ObjectInputStream(bis);
90 DummyStepInterpolator dsi = (DummyStepInterpolator) ois.readObject();
91
92 dsi.setInterpolatedTime(0.5);
93 double[] result = dsi.getInterpolatedState();
94 for (int i = 0; i < result.length; ++i) {
95 Assert.assertTrue(JdkMath.abs(result[i] - y[i]) < 1.0e-10);
96 }
97 }
98
99 @Test
100 public void testImpossibleSerialization()
101 throws IOException {
102
103 double[] y = { 0.0, 1.0, -2.0 };
104 AbstractStepInterpolator interpolator = new BadStepInterpolator(y, true);
105 interpolator.storeTime(0);
106 interpolator.shift();
107 interpolator.storeTime(1);
108
109 ByteArrayOutputStream bos = new ByteArrayOutputStream();
110 ObjectOutputStream oos = new ObjectOutputStream(bos);
111 try {
112 oos.writeObject(interpolator);
113 Assert.fail("an exception should have been thrown");
114 } catch (LocalException le) {
115
116 }
117 }
118
119 private static final class BadStepInterpolator extends DummyStepInterpolator {
120 private static final long serialVersionUID = 1;
121 BadStepInterpolator(double[] y, boolean forward) {
122 super(y, new double[y.length], forward);
123 }
124 @Override
125 protected void doFinalize() {
126 throw new LocalException();
127 }
128 }
129
130 private static final class LocalException extends RuntimeException {
131 private static final long serialVersionUID = 1L;
132 }
133 }