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.serializer; |
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20 | |
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21 | import java.io.IOException; |
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22 | import java.io.InputStream; |
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23 | import java.io.ObjectInputStream; |
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24 | import java.io.ObjectOutputStream; |
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25 | import java.io.OutputStream; |
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26 | import java.io.Serializable; |
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27 | |
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28 | /** |
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29 | * <p> |
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30 | * An experimental {@link Serialization} for Java {@link Serializable} classes. |
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31 | * </p> |
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32 | * @see JavaSerializationComparator |
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33 | */ |
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34 | public class JavaSerialization implements Serialization<Serializable> { |
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35 | |
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36 | static class JavaSerializationDeserializer<T extends Serializable> |
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37 | implements Deserializer<T> { |
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38 | |
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39 | private ObjectInputStream ois; |
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40 | |
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41 | public void open(InputStream in) throws IOException { |
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42 | ois = new ObjectInputStream(in) { |
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43 | @Override protected void readStreamHeader() { |
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44 | // no header |
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45 | } |
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46 | }; |
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47 | } |
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48 | |
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49 | @SuppressWarnings("unchecked") |
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50 | public T deserialize(T object) throws IOException { |
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51 | try { |
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52 | // ignore passed-in object |
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53 | return (T) ois.readObject(); |
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54 | } catch (ClassNotFoundException e) { |
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55 | throw new IOException(e.toString()); |
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56 | } |
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57 | } |
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58 | |
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59 | public void close() throws IOException { |
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60 | ois.close(); |
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61 | } |
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62 | |
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63 | } |
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64 | |
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65 | static class JavaSerializationSerializer |
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66 | implements Serializer<Serializable> { |
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67 | |
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68 | private ObjectOutputStream oos; |
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69 | |
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70 | public void open(OutputStream out) throws IOException { |
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71 | oos = new ObjectOutputStream(out) { |
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72 | @Override protected void writeStreamHeader() { |
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73 | // no header |
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74 | } |
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75 | }; |
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76 | } |
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77 | |
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78 | public void serialize(Serializable object) throws IOException { |
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79 | oos.reset(); // clear (class) back-references |
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80 | oos.writeObject(object); |
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81 | } |
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82 | |
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83 | public void close() throws IOException { |
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84 | oos.close(); |
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85 | } |
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86 | |
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87 | } |
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88 | |
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89 | public boolean accept(Class<?> c) { |
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90 | return Serializable.class.isAssignableFrom(c); |
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91 | } |
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92 | |
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93 | public Deserializer<Serializable> getDeserializer(Class<Serializable> c) { |
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94 | return new JavaSerializationDeserializer<Serializable>(); |
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95 | } |
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96 | |
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97 | public Serializer<Serializable> getSerializer(Class<Serializable> c) { |
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98 | return new JavaSerializationSerializer(); |
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99 | } |
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100 | |
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101 | } |
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