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 testjar; |
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20 | |
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21 | import java.io.DataInput; |
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22 | import java.io.DataOutput; |
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23 | import java.io.IOException; |
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24 | |
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25 | import org.apache.hadoop.io.WritableComparable; |
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26 | |
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27 | /** |
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28 | * This is an example simple writable class. This is used as a class external |
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29 | * to the Hadoop IO classes for testing of user Writable classes. |
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30 | * |
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31 | */ |
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32 | public class ExternalWritable |
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33 | implements WritableComparable { |
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34 | |
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35 | private String message = null; |
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36 | |
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37 | public ExternalWritable() { |
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38 | |
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39 | } |
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40 | |
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41 | public ExternalWritable(String message) { |
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42 | this.message = message; |
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43 | } |
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44 | |
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45 | public String getMessage() { |
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46 | return message; |
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47 | } |
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48 | |
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49 | public void setMessage(String message) { |
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50 | this.message = message; |
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51 | } |
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52 | |
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53 | public void readFields(DataInput in) |
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54 | throws IOException { |
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55 | |
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56 | message = null; |
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57 | boolean hasMessage = in.readBoolean(); |
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58 | if (hasMessage) { |
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59 | message = in.readUTF(); |
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60 | } |
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61 | } |
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62 | |
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63 | public void write(DataOutput out) |
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64 | throws IOException { |
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65 | |
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66 | boolean hasMessage = (message != null && message.length() > 0); |
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67 | out.writeBoolean(hasMessage); |
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68 | if (hasMessage) { |
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69 | out.writeUTF(message); |
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70 | } |
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71 | } |
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72 | |
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73 | public int compareTo(Object o) { |
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74 | |
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75 | if (!(o instanceof ExternalWritable)) { |
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76 | throw new IllegalArgumentException("Input not an ExternalWritable"); |
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77 | } |
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78 | |
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79 | ExternalWritable that = (ExternalWritable)o; |
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80 | return this.message.compareTo(that.message); |
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81 | } |
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82 | |
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83 | public String toString() { |
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84 | return this.message; |
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85 | } |
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86 | } |
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