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.io.*; |
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22 | import java.util.Random; |
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23 | |
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24 | import org.apache.hadoop.conf.Configurable; |
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25 | import org.apache.hadoop.conf.Configuration; |
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26 | import org.apache.hadoop.util.ReflectionUtils; |
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27 | |
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28 | import junit.framework.TestCase; |
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29 | |
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30 | /** Unit tests for Writable. */ |
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31 | public class TestWritable extends TestCase { |
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32 | public TestWritable(String name) { super(name); } |
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33 | |
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34 | /** Example class used in test cases below. */ |
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35 | public static class SimpleWritable implements Writable { |
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36 | private static final Random RANDOM = new Random(); |
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37 | |
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38 | int state = RANDOM.nextInt(); |
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39 | |
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40 | public void write(DataOutput out) throws IOException { |
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41 | out.writeInt(state); |
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42 | } |
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43 | |
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44 | public void readFields(DataInput in) throws IOException { |
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45 | this.state = in.readInt(); |
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46 | } |
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47 | |
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48 | public static SimpleWritable read(DataInput in) throws IOException { |
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49 | SimpleWritable result = new SimpleWritable(); |
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50 | result.readFields(in); |
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51 | return result; |
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52 | } |
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53 | |
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54 | /** Required by test code, below. */ |
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55 | public boolean equals(Object o) { |
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56 | if (!(o instanceof SimpleWritable)) |
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57 | return false; |
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58 | SimpleWritable other = (SimpleWritable)o; |
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59 | return this.state == other.state; |
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60 | } |
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61 | } |
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62 | |
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63 | /** Test 1: Check that SimpleWritable. */ |
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64 | public void testSimpleWritable() throws Exception { |
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65 | testWritable(new SimpleWritable()); |
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66 | } |
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67 | |
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68 | public void testByteWritable() throws Exception { |
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69 | testWritable(new ByteWritable((byte)128)); |
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70 | } |
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71 | |
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72 | public void testDoubleWritable() throws Exception { |
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73 | testWritable(new DoubleWritable(1.0)); |
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74 | } |
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75 | |
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76 | /** Utility method for testing writables. */ |
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77 | public static Writable testWritable(Writable before) |
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78 | throws Exception { |
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79 | return testWritable(before, null); |
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80 | } |
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81 | |
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82 | /** Utility method for testing writables. */ |
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83 | public static Writable testWritable(Writable before |
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84 | , Configuration conf) throws Exception { |
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85 | DataOutputBuffer dob = new DataOutputBuffer(); |
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86 | before.write(dob); |
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87 | |
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88 | DataInputBuffer dib = new DataInputBuffer(); |
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89 | dib.reset(dob.getData(), dob.getLength()); |
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90 | |
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91 | Writable after = (Writable)ReflectionUtils.newInstance( |
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92 | before.getClass(), conf); |
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93 | after.readFields(dib); |
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94 | |
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95 | assertEquals(before, after); |
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96 | return after; |
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97 | } |
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98 | |
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99 | } |
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