[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | |
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| 19 | package org.apache.hadoop.io; |
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| 20 | |
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| 21 | import java.util.*; |
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| 22 | import java.io.*; |
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| 23 | |
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| 24 | public class RandomDatum implements WritableComparable { |
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| 25 | private int length; |
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| 26 | private byte[] data; |
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| 27 | |
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| 28 | public RandomDatum() {} |
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| 29 | |
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| 30 | public RandomDatum(Random random) { |
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| 31 | length = 10 + (int) Math.pow(10.0, random.nextFloat() * 3.0); |
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| 32 | data = new byte[length]; |
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| 33 | random.nextBytes(data); |
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| 34 | } |
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| 35 | |
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| 36 | public int getLength() { |
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| 37 | return length; |
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| 38 | } |
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| 39 | |
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| 40 | public void write(DataOutput out) throws IOException { |
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| 41 | out.writeInt(length); |
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| 42 | out.write(data); |
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| 43 | } |
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| 44 | |
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| 45 | public void readFields(DataInput in) throws IOException { |
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| 46 | length = in.readInt(); |
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| 47 | if (data == null || length > data.length) |
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| 48 | data = new byte[length]; |
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| 49 | in.readFully(data, 0, length); |
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| 50 | } |
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| 51 | |
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| 52 | public int compareTo(Object o) { |
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| 53 | RandomDatum that = (RandomDatum)o; |
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| 54 | return WritableComparator.compareBytes(this.data, 0, this.length, |
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| 55 | that.data, 0, that.length); |
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| 56 | } |
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| 57 | |
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| 58 | public boolean equals(Object o) { |
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| 59 | return compareTo(o) == 0; |
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| 60 | } |
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| 61 | |
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| 62 | private static final char[] HEX_DIGITS = |
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| 63 | {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'}; |
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| 64 | |
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| 65 | /** Returns a string representation of this object. */ |
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| 66 | public String toString() { |
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| 67 | StringBuffer buf = new StringBuffer(length*2); |
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| 68 | for (int i = 0; i < length; i++) { |
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| 69 | int b = data[i]; |
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| 70 | buf.append(HEX_DIGITS[(b >> 4) & 0xf]); |
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| 71 | buf.append(HEX_DIGITS[b & 0xf]); |
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| 72 | } |
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| 73 | return buf.toString(); |
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| 74 | } |
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| 75 | |
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| 76 | public static class Generator { |
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| 77 | Random random; |
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| 78 | |
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| 79 | private RandomDatum key; |
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| 80 | private RandomDatum value; |
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| 81 | |
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| 82 | public Generator() { random = new Random(); } |
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| 83 | public Generator(int seed) { random = new Random(seed); } |
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| 84 | |
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| 85 | public RandomDatum getKey() { return key; } |
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| 86 | public RandomDatum getValue() { return value; } |
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| 87 | |
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| 88 | public void next() { |
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| 89 | key = new RandomDatum(random); |
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| 90 | value = new RandomDatum(random); |
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| 91 | } |
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| 92 | } |
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| 93 | |
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| 94 | /** A WritableComparator optimized for RandomDatum. */ |
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| 95 | public static class Comparator extends WritableComparator { |
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| 96 | public Comparator() { |
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| 97 | super(RandomDatum.class); |
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| 98 | } |
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| 99 | |
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| 100 | public int compare(byte[] b1, int s1, int l1, |
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| 101 | byte[] b2, int s2, int l2) { |
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| 102 | int n1 = readInt(b1, s1); |
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| 103 | int n2 = readInt(b2, s2); |
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| 104 | return compareBytes(b1, s1+4, n1, b2, s2+4, n2); |
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| 105 | } |
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| 106 | } |
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| 107 | |
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| 108 | } |
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