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 | package org.apache.hadoop.io; |
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19 | |
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20 | import junit.framework.TestCase; |
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21 | |
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22 | /** |
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23 | * This is the unit test for BytesWritable. |
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24 | */ |
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25 | public class TestBytesWritable extends TestCase { |
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26 | |
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27 | public void testSizeChange() throws Exception { |
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28 | byte[] hadoop = "hadoop".getBytes(); |
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29 | BytesWritable buf = new BytesWritable(hadoop); |
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30 | int size = buf.getLength(); |
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31 | int orig_capacity = buf.getCapacity(); |
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32 | buf.setSize(size*2); |
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33 | int new_capacity = buf.getCapacity(); |
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34 | System.arraycopy(buf.getBytes(), 0, buf.getBytes(), size, size); |
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35 | assertTrue(new_capacity >= size * 2); |
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36 | assertEquals(size * 2, buf.getLength()); |
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37 | assertTrue(new_capacity != orig_capacity); |
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38 | buf.setSize(size*4); |
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39 | assertTrue(new_capacity != buf.getCapacity()); |
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40 | for(int i=0; i < size*2; ++i) { |
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41 | assertEquals(hadoop[i%size], buf.getBytes()[i]); |
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42 | } |
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43 | // shrink the buffer |
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44 | buf.setCapacity(1); |
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45 | // make sure the size has been cut down too |
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46 | assertEquals(1, buf.getLength()); |
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47 | // but that the data is still there |
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48 | assertEquals(hadoop[0], buf.getBytes()[0]); |
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49 | } |
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50 | |
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51 | public void testHash() throws Exception { |
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52 | byte[] owen = "owen".getBytes(); |
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53 | BytesWritable buf = new BytesWritable(owen); |
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54 | assertEquals(4347922, buf.hashCode()); |
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55 | buf.setCapacity(10000); |
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56 | assertEquals(4347922, buf.hashCode()); |
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57 | buf.setSize(0); |
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58 | assertEquals(1, buf.hashCode()); |
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59 | } |
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60 | |
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61 | public void testCompare() throws Exception { |
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62 | byte[][] values = new byte[][]{"abc".getBytes(), |
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63 | "ad".getBytes(), |
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64 | "abcd".getBytes(), |
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65 | "".getBytes(), |
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66 | "b".getBytes()}; |
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67 | BytesWritable[] buf = new BytesWritable[values.length]; |
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68 | for(int i=0; i < values.length; ++i) { |
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69 | buf[i] = new BytesWritable(values[i]); |
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70 | } |
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71 | // check to make sure the compare function is symetric and reflexive |
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72 | for(int i=0; i < values.length; ++i) { |
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73 | for(int j=0; j < values.length; ++j) { |
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74 | assertTrue(buf[i].compareTo(buf[j]) == -buf[j].compareTo(buf[i])); |
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75 | assertTrue((i == j) == (buf[i].compareTo(buf[j]) == 0)); |
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76 | } |
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77 | } |
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78 | assertTrue(buf[0].compareTo(buf[1]) < 0); |
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79 | assertTrue(buf[1].compareTo(buf[2]) > 0); |
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80 | assertTrue(buf[2].compareTo(buf[3]) > 0); |
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81 | assertTrue(buf[3].compareTo(buf[4]) < 0); |
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82 | } |
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83 | |
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84 | private void checkToString(byte[] input, String expected) { |
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85 | String actual = new BytesWritable(input).toString(); |
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86 | assertEquals(expected, actual); |
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87 | } |
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88 | |
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89 | public void testToString() { |
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90 | checkToString(new byte[]{0,1,2,0x10}, "00 01 02 10"); |
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91 | checkToString(new byte[]{-0x80, -0x7f, -0x1, -0x2, 1, 0}, |
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92 | "80 81 ff fe 01 00"); |
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93 | } |
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94 | } |
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95 | |
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