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19 package org.apache.hadoop.hbase.util.vint;
20
21 import java.io.ByteArrayInputStream;
22 import java.io.IOException;
23 import java.util.Random;
24
25 import org.apache.hadoop.hbase.testclassification.SmallTests;
26 import org.apache.hadoop.hbase.util.number.RandomNumberUtils;
27 import org.junit.Assert;
28 import org.junit.Test;
29 import org.junit.experimental.categories.Category;
30
31 @Category(SmallTests.class)
32 public class TestVLongTool {
33
34 @Test
35 public void testNumBytes() {
36 Assert.assertEquals(1, UVLongTool.numBytes(0));
37 Assert.assertEquals(1, UVLongTool.numBytes(1));
38 Assert.assertEquals(1, UVLongTool.numBytes(100));
39 Assert.assertEquals(1, UVLongTool.numBytes(126));
40 Assert.assertEquals(1, UVLongTool.numBytes(127));
41 Assert.assertEquals(2, UVLongTool.numBytes(128));
42 Assert.assertEquals(2, UVLongTool.numBytes(129));
43 Assert.assertEquals(9, UVLongTool.numBytes(Long.MAX_VALUE));
44 }
45
46 @Test
47 public void testToBytes() {
48 Assert.assertArrayEquals(new byte[] { 0 }, UVLongTool.getBytes(0));
49 Assert.assertArrayEquals(new byte[] { 1 }, UVLongTool.getBytes(1));
50 Assert.assertArrayEquals(new byte[] { 63 }, UVLongTool.getBytes(63));
51 Assert.assertArrayEquals(new byte[] { 127 }, UVLongTool.getBytes(127));
52 Assert.assertArrayEquals(new byte[] { -128, 1 }, UVLongTool.getBytes(128));
53 Assert.assertArrayEquals(new byte[] { -128 + 27, 1 }, UVLongTool.getBytes(155));
54 Assert.assertArrayEquals(UVLongTool.MAX_VALUE_BYTES, UVLongTool.getBytes(Long.MAX_VALUE));
55 }
56
57 @Test
58 public void testFromBytes() {
59 Assert.assertEquals(Long.MAX_VALUE, UVLongTool.getLong(UVLongTool.MAX_VALUE_BYTES));
60 }
61
62 @Test
63 public void testFromBytesOffset() {
64 Assert.assertEquals(Long.MAX_VALUE, UVLongTool.getLong(UVLongTool.MAX_VALUE_BYTES, 0));
65
66 long ms = 1318966363481L;
67
68 byte[] bytes = UVLongTool.getBytes(ms);
69
70 long roundTripped = UVLongTool.getLong(bytes, 0);
71 Assert.assertEquals(ms, roundTripped);
72
73 int calculatedNumBytes = UVLongTool.numBytes(ms);
74 int actualNumBytes = bytes.length;
75 Assert.assertEquals(actualNumBytes, calculatedNumBytes);
76
77 byte[] shiftedBytes = new byte[1000];
78 int shift = 33;
79 System.arraycopy(bytes, 0, shiftedBytes, shift, bytes.length);
80 long shiftedRoundTrip = UVLongTool.getLong(shiftedBytes, shift);
81 Assert.assertEquals(ms, shiftedRoundTrip);
82 }
83
84 @Test
85 public void testRoundTrips() {
86 Random random = new Random();
87 for (int i = 0; i < 10000; ++i) {
88 long value = RandomNumberUtils.nextPositiveLong(random);
89 byte[] bytes = UVLongTool.getBytes(value);
90 long roundTripped = UVLongTool.getLong(bytes);
91 Assert.assertEquals(value, roundTripped);
92 int calculatedNumBytes = UVLongTool.numBytes(value);
93 int actualNumBytes = bytes.length;
94 Assert.assertEquals(actualNumBytes, calculatedNumBytes);
95 }
96 }
97
98 @Test
99 public void testInputStreams() throws IOException {
100 ByteArrayInputStream is;
101 is = new ByteArrayInputStream(new byte[] { 0 });
102 Assert.assertEquals(0, UVLongTool.getLong(is));
103 is = new ByteArrayInputStream(new byte[] { 5 });
104 Assert.assertEquals(5, UVLongTool.getLong(is));
105 is = new ByteArrayInputStream(new byte[] { -128 + 27, 1 });
106 Assert.assertEquals(155, UVLongTool.getLong(is));
107 }
108 }