1 /*
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3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * The contents of this file are subject to the terms of either the Universal Permissive License
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8 *
9 * or the following license:
10 *
11 * Redistribution and use in source and binary forms, with or without modification, are permitted
12 * provided that the following conditions are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
15 * and the following disclaimer.
16 *
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18 * conditions and the following disclaimer in the documentation and/or other materials provided with
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22 * endorse or promote products derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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32 */
33 package org.openjdk.jmc.common.test;
34
35 import static org.openjdk.jmc.common.unit.BinaryPrefix.NOBI;
36 import static org.junit.Assert.assertEquals;
37 import static org.junit.Assert.assertNotNull;
38 import static org.junit.Assert.assertSame;
39
40 import org.junit.Assert;
41 import org.junit.Test;
42
43 import org.openjdk.jmc.common.unit.BinaryPrefix;
44
45 public class BinaryPrefixTest extends MCTestCase {
46
47 private void assertAlignmentLog2(int expectedLog2, long value) throws Exception {
48 Assert.assertEquals(expectedLog2, BinaryPrefix.getAlignmentLog2(value));
49 }
50
51 private void assertAlignmentLog2(int expectedLog2, double value) throws Exception {
52 Assert.assertEquals(expectedLog2, BinaryPrefix.getAlignmentLog2(value));
53 }
54
55 @Test
56 public void testZero() {
57 assertEquals(0, BinaryPrefix.getFloorLog1024(0));
58 assertEquals(NOBI, BinaryPrefix.getFloorPrefix(0));
59 }
60
61 @Test
62 public void testZeroDouble() {
63 assertEquals(0, BinaryPrefix.getFloorLog1024(0.0));
64 assertEquals(NOBI, BinaryPrefix.getFloorPrefix(0.0));
65 }
66
67 @Test
68 public void testPositive() {
69 int oldLog1024 = -1;
70 BinaryPrefix oldPrefix = null;
71 int i = 0;
72 for (long val = 1; val != 0; val <<= 1) {
73 int log1024 = BinaryPrefix.getFloorLog1024(val);
74 BinaryPrefix prefix = BinaryPrefix.getFloorPrefix(val);
75
76 if ((i++ % 10) == 0) {
77 assertGreaterThan("For value " + val, oldLog1024, log1024);
78 if (oldPrefix == null) {
79 assertNotNull(prefix);
80 } else {
81 assertGreaterThan(oldPrefix, prefix);
82 }
83 } else {
84 assertEquals("For value " + val, oldLog1024, log1024);
85 assertSame(oldPrefix, prefix);
86 }
87
88 oldLog1024 = log1024;
89 oldPrefix = prefix;
90 }
91 }
92
93 @Test
94 public void testPositiveDouble() {
95 int oldLog1024 = -1;
96 BinaryPrefix oldPrefix = null;
97 int i = 0;
98 for (int powOf2 = 0; powOf2 < 90; powOf2++) {
99 double val = Math.scalb(1.0, powOf2);
100 int log1024 = BinaryPrefix.getFloorLog1024(val);
101 BinaryPrefix prefix = BinaryPrefix.getFloorPrefix(val);
102
103 if ((i++ % 10) == 0) {
104 assertGreaterThan("For value " + val, oldLog1024, log1024);
105 if (oldPrefix == null) {
106 assertNotNull(prefix);
107 } else {
108 assertGreaterThan(oldPrefix, prefix);
109 }
110 } else {
111 assertEquals("For value " + val, oldLog1024, log1024);
112 assertSame(oldPrefix, prefix);
113 }
114
115 oldLog1024 = log1024;
116 oldPrefix = prefix;
117 }
118 }
119
120 @Test
121 public void testNegative() {
122 int oldLog1024 = -1;
123 BinaryPrefix oldPrefix = null;
124 int i = 0;
125 for (long val = -1; val != 0; val <<= 1) {
126 int log1024 = BinaryPrefix.getFloorLog1024(val);
127 BinaryPrefix prefix = BinaryPrefix.getFloorPrefix(val);
128
129 if ((i++ % 10) == 0) {
130 assertGreaterThan("For value " + val, oldLog1024, log1024);
131 if (oldPrefix == null) {
132 assertNotNull(prefix);
133 } else {
134 assertGreaterThan(oldPrefix, prefix);
135 }
136 } else {
137 assertEquals("For value " + val, oldLog1024, log1024);
138 assertSame(oldPrefix, prefix);
139 }
140
141 oldLog1024 = log1024;
142 oldPrefix = prefix;
143 }
144 }
145
146 @Test
147 public void testNegativeDouble() {
148 int oldLog1024 = -1;
149 BinaryPrefix oldPrefix = null;
150 int i = 0;
151 for (int powOf2 = 0; powOf2 < 90; powOf2++) {
152 double val = -Math.scalb(1.0, powOf2);
153 int log1024 = BinaryPrefix.getFloorLog1024(val);
154 BinaryPrefix prefix = BinaryPrefix.getFloorPrefix(val);
155
156 if ((i++ % 10) == 0) {
157 assertGreaterThan("For value " + val, oldLog1024, log1024);
158 if (oldPrefix == null) {
159 assertNotNull(prefix);
160 } else {
161 assertGreaterThan(oldPrefix, prefix);
162 }
163 } else {
164 assertEquals("For value " + val, oldLog1024, log1024);
165 assertSame(oldPrefix, prefix);
166 }
167
168 oldLog1024 = log1024;
169 oldPrefix = prefix;
170 }
171 }
172
173 @Test
174 public void testBinaryLongAlignment() throws Exception {
175 assertAlignmentLog2(0, 1);
176 assertAlignmentLog2(0, 17);
177 assertAlignmentLog2(0, 1027);
178 assertAlignmentLog2(1, 2);
179 assertAlignmentLog2(1, 42);
180 assertAlignmentLog2(1, 1030);
181 assertAlignmentLog2(2, 4);
182 assertAlignmentLog2(3, 8);
183 assertAlignmentLog2(4, 16);
184 assertAlignmentLog2(10, 1024);
185 }
186
187 @Test
188 public void testBinaryDoubleAlignment() throws Exception {
189 assertAlignmentLog2(0, 1.0);
190 assertAlignmentLog2(0, 17.0);
191 assertAlignmentLog2(0, 1027.0);
192 assertAlignmentLog2(1, 2.0);
193 assertAlignmentLog2(1, 42.0);
194 assertAlignmentLog2(1, 1030.0);
195 assertAlignmentLog2(2, 4.0);
196 assertAlignmentLog2(3, 8.0);
197 assertAlignmentLog2(4, 16.0);
198 assertAlignmentLog2(10, 1024.0);
199
200 assertAlignmentLog2(-1, 0.5);
201 assertAlignmentLog2(-1, 1.5);
202 assertAlignmentLog2(-1, 17.5);
203 assertAlignmentLog2(-1, 16777216.5);
204
205 assertAlignmentLog2(-2, 0.25);
206 assertAlignmentLog2(-2, 1.25);
207 assertAlignmentLog2(-2, 17.25);
208 assertAlignmentLog2(-2, 16777216.25);
209 }
210 }