1 | /** |
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2 | * Copyright 2007 The Apache Software Foundation |
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3 | * |
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4 | * Licensed to the Apache Software Foundation (ASF) under one |
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5 | * or more contributor license agreements. See the NOTICE file |
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6 | * distributed with this work for additional information |
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7 | * regarding copyright ownership. The ASF licenses this file |
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8 | * to you under the Apache License, Version 2.0 (the |
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9 | * "License"); you may not use this file except in compliance |
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10 | * with the License. You may obtain a copy of the License at |
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11 | * |
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12 | * http://www.apache.org/licenses/LICENSE-2.0 |
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13 | * |
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14 | * Unless required by applicable law or agreed to in writing, software |
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15 | * distributed under the License is distributed on an "AS IS" BASIS, |
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16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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17 | * See the License for the specific language governing permissions and |
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18 | * limitations under the License. |
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19 | */ |
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20 | package org.apache.hadoop.io; |
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21 | |
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22 | import java.io.ByteArrayInputStream; |
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23 | import java.io.ByteArrayOutputStream; |
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24 | import java.io.DataInputStream; |
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25 | import java.io.DataOutputStream; |
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26 | import java.util.Map; |
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27 | |
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28 | import junit.framework.TestCase; |
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29 | |
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30 | /** |
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31 | * Tests MapWritable |
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32 | */ |
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33 | public class TestMapWritable extends TestCase { |
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34 | /** the test */ |
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35 | @SuppressWarnings("unchecked") |
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36 | public void testMapWritable() { |
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37 | Text[] keys = { |
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38 | new Text("key1"), |
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39 | new Text("key2"), |
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40 | new Text("Key3"), |
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41 | }; |
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42 | |
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43 | BytesWritable[] values = { |
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44 | new BytesWritable("value1".getBytes()), |
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45 | new BytesWritable("value2".getBytes()), |
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46 | new BytesWritable("value3".getBytes()) |
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47 | }; |
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48 | |
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49 | MapWritable inMap = new MapWritable(); |
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50 | for (int i = 0; i < keys.length; i++) { |
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51 | inMap.put(keys[i], values[i]); |
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52 | } |
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53 | |
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54 | MapWritable outMap = new MapWritable(inMap); |
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55 | assertEquals(inMap.size(), outMap.size()); |
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56 | |
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57 | for (Map.Entry<Writable, Writable> e: inMap.entrySet()) { |
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58 | assertTrue(outMap.containsKey(e.getKey())); |
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59 | assertEquals(0, ((WritableComparable) outMap.get(e.getKey())).compareTo( |
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60 | e.getValue())); |
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61 | } |
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62 | |
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63 | // Now for something a little harder... |
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64 | |
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65 | Text[] maps = { |
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66 | new Text("map1"), |
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67 | new Text("map2") |
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68 | }; |
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69 | |
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70 | MapWritable mapOfMaps = new MapWritable(); |
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71 | mapOfMaps.put(maps[0], inMap); |
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72 | mapOfMaps.put(maps[1], outMap); |
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73 | |
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74 | MapWritable copyOfMapOfMaps = new MapWritable(mapOfMaps); |
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75 | for (int i = 0; i < maps.length; i++) { |
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76 | assertTrue(copyOfMapOfMaps.containsKey(maps[i])); |
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77 | MapWritable a = (MapWritable) mapOfMaps.get(maps[i]); |
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78 | MapWritable b = (MapWritable) copyOfMapOfMaps.get(maps[i]); |
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79 | assertEquals(a.size(), b.size()); |
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80 | for (Writable key: a.keySet()) { |
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81 | assertTrue(b.containsKey(key)); |
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82 | |
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83 | // This will work because we know what we put into each set |
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84 | |
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85 | WritableComparable aValue = (WritableComparable) a.get(key); |
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86 | WritableComparable bValue = (WritableComparable) b.get(key); |
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87 | assertEquals(0, aValue.compareTo(bValue)); |
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88 | } |
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89 | } |
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90 | } |
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91 | |
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92 | /** |
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93 | * Test that number of "unknown" classes is propagated across multiple copies. |
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94 | */ |
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95 | @SuppressWarnings("deprecation") |
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96 | public void testForeignClass() { |
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97 | MapWritable inMap = new MapWritable(); |
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98 | inMap.put(new Text("key"), new UTF8("value")); |
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99 | inMap.put(new Text("key2"), new UTF8("value2")); |
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100 | MapWritable outMap = new MapWritable(inMap); |
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101 | MapWritable copyOfCopy = new MapWritable(outMap); |
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102 | assertEquals(1, copyOfCopy.getNewClasses()); |
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103 | } |
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104 | |
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105 | /** |
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106 | * Assert MapWritable does not grow across calls to readFields. |
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107 | * @throws Exception |
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108 | * @see <a href="https://issues.apache.org/jira/browse/HADOOP-2244">HADOOP-2244</a> |
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109 | */ |
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110 | public void testMultipleCallsToReadFieldsAreSafe() throws Exception { |
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111 | // Create an instance and add a key/value. |
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112 | MapWritable m = new MapWritable(); |
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113 | final Text t = new Text(getName()); |
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114 | m.put(t, t); |
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115 | // Get current size of map. Key values are 't'. |
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116 | int count = m.size(); |
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117 | // Now serialize... save off the bytes. |
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118 | ByteArrayOutputStream baos = new ByteArrayOutputStream(); |
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119 | DataOutputStream dos = new DataOutputStream(baos); |
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120 | m.write(dos); |
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121 | dos.close(); |
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122 | // Now add new values to the MapWritable. |
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123 | m.put(new Text("key1"), new Text("value1")); |
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124 | m.put(new Text("key2"), new Text("value2")); |
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125 | // Now deserialize the original MapWritable. Ensure count and key values |
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126 | // match original state. |
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127 | ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray()); |
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128 | DataInputStream dis = new DataInputStream(bais); |
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129 | m.readFields(dis); |
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130 | assertEquals(count, m.size()); |
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131 | assertTrue(m.get(t).equals(t)); |
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132 | dis.close(); |
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133 | } |
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134 | } |
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