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1
2
3
4 package net.nutch.io;
5
6 import java.util.*;
7 import java.io.*;
8
9 public class RandomDatum implements WritableComparable {
10 private int length;
11 private byte[] data;
12
13 public RandomDatum() {}
14
15 public RandomDatum(Random random) {
16 length = 10 + random.nextInt(100);
17 data = new byte[length];
18 random.nextBytes(data);
19 }
20
21 public void write(DataOutput out) throws IOException {
22 out.writeInt(length);
23 out.write(data);
24 }
25
26 public void readFields(DataInput in) throws IOException {
27 length = in.readInt();
28 if (data == null || length > data.length)
29 data = new byte[length];
30 in.readFully(data, 0, length);
31 }
32
33 public int compareTo(Object  o) {
34 RandomDatum that = (RandomDatum)o;
35 return WritableComparator.compareBytes(this.data, 0, this.length,
36 that.data, 0, that.length);
37 }
38
39 public boolean equals(Object o) {
40 return compareTo(o) == 0;
41 }
42
43 private static final char[] HEX_DIGITS =
44 {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
45
46
47 public String toString() {
48 StringBuffer buf = new StringBuffer (length*2);
49 for (int i = 0; i < length; i++) {
50 int b = data[i];
51 buf.append(HEX_DIGITS[(b >> 4) & 0xf]);
52 buf.append(HEX_DIGITS[b & 0xf]);
53 }
54 return buf.toString();
55 }
56
57 public static class Generator {
58 Random random;
59
60 private RandomDatum key;
61 private RandomDatum value;
62
63 public Generator() { random = new Random(); }
64 public Generator(int seed) { random = new Random(seed); }
65
66 public RandomDatum getKey() { return key; }
67 public RandomDatum getValue() { return value; }
68
69 public void next() {
70 key = new RandomDatum(random);
71 value = new RandomDatum(random);
72 }
73 }
74
75
76 public static class Comparator extends WritableComparator {
77 public Comparator() {
78 super(RandomDatum.class);
79 }
80
81 public int compare(byte[] b1, int s1, int l1,
82 byte[] b2, int s2, int l2) {
83 int n1 = readInt(b1, s1);
84 int n2 = readInt(b2, s2);
85 return compareBytes(b1, s1+4, n1, b2, s2+4, n2);
86 }
87 }
88
89 }
90 |
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