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