Examples of org.apache.avro.io.Decoder

org.apache.avro.io.Decoder
Low-level support for de-serializing Avro values. This class has two types of methods. One type of methods support the reading of leaf values (for example, {@link #readLong} and{@link #readString}). The other type of methods support the reading of maps and arrays. These methods are {@link #readArrayStart}, {@link #arrayNext}, and similar methods for maps). See {@link #readArrayStart} fordetails on these methods.) @see Encoder

    writer.write(datum, encoder);
    encoder.flush();
    byte[] data = out.toByteArray();


    reader.setSchema(schema);
    Decoder decoder = new JsonDecoder(schema, new ByteArrayInputStream(data));
    Object decoded = reader.read(null, decoder);
    assertEquals("Decoded data does not match.", datum, decoded);


    decoded = reader.read(decoded, decoder);
    assertEquals("Decoded data does not match.", datum, decoded);

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    DatumWriter<Object> writer = new GenericDatumWriter<Object>(actual);
    Encoder encoder = new BinaryEncoder(out);
    writer.write(new GenericData.EnumSymbol("Y"), encoder);
    writer.write(new GenericData.EnumSymbol("X"), encoder);
    byte[] data = out.toByteArray();
    Decoder decoder = DecoderFactory.defaultFactory().createBinaryDecoder(
        data, null);
    DatumReader<String> in = new GenericDatumReader<String>(actual, expected);
    assertEquals("Wrong value", new GenericData.EnumSymbol("Y"),
                 in.read(null, decoder));
    try {

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    writer.write(b, e);
    e.flush();
    ReflectDatumReader<AnotherSampleRecord> reader = 
      new ReflectDatumReader<AnotherSampleRecord>(schm);
    ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
    Decoder d = DecoderFactory.defaultFactory().createBinaryDecoder(in, null);
    AnotherSampleRecord decoded = reader.read(null, d);
    assertEquals(a, decoded);
    decoded = reader.read(null, d);
    assertEquals(b, decoded);
  }

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  /** Called by a server to deserialize a request, compute and serialize a
   * response or error.  Transciever is used by connection-based servers to
   * track handshake status of connection. */
  public List<ByteBuffer> respond(List<ByteBuffer> buffers,
                                  Transceiver connection) throws IOException {
    Decoder in = DecoderFactory.get().binaryDecoder(
        new ByteBufferInputStream(buffers), null);
    ByteBufferOutputStream bbo = new ByteBufferOutputStream();
    BinaryEncoder out = EncoderFactory.get().binaryEncoder(bbo, null);
    Exception error = null;
    RPCContext context = new RPCContext();
    List<ByteBuffer> payload = null;
    List<ByteBuffer> handshake = null;
    boolean wasConnected = connection != null && connection.isConnected();
    try {
      Protocol remote = handshake(in, out, connection);
      out.flush();
      if (remote == null)                        // handshake failed
        return bbo.getBufferList();
      handshake = bbo.getBufferList();
      
      // read request using remote protocol specification
      context.setRequestCallMeta(META_READER.read(null, in));
      String messageName = in.readString(null).toString();
      Message rm = remote.getMessages().get(messageName);
      if (rm == null)
        throw new AvroRuntimeException("No such remote message: "+messageName);
      Message m = getLocal().getMessages().get(messageName);
      if (m == null)

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        }
        return output.toByteArray();
    }


    public T toObject(byte[] bytes) {
        Decoder decoder = DecoderFactory.defaultFactory().createBinaryDecoder(bytes, null);
        SpecificDatumReader<T> reader = null;
        try {
            reader = new SpecificDatumReader<T>(clazz);
            return reader.read(null, decoder);
        } catch(IOException e) {

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        }
        return output.toByteArray();
    }


    public Object toObject(byte[] bytes) {
        Decoder decoder = DecoderFactory.defaultFactory().createBinaryDecoder(bytes, null);
        GenericDatumReader<Object> reader = null;
        try {
            reader = new GenericDatumReader<Object>(typeDef);
            return reader.read(null, decoder);
        } catch(IOException e) {

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        }
        return output.toByteArray();
    }


    public T toObject(byte[] bytes) {
        Decoder decoder = DecoderFactory.defaultFactory().createBinaryDecoder(bytes, null);
        ReflectDatumReader<T> reader = null;
        try {
            reader = new ReflectDatumReader<T>(clazz);
            return reader.read(null, decoder);
        } catch(IOException e) {

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        Schema typeDefWriter = Schema.parse(typeDefVersions.get(version));


        byte[] dataBytes = new byte[bytes.length - 1];
        System.arraycopy(bytes, 1, dataBytes, 0, bytes.length - 1);
        Decoder decoder = DecoderFactory.defaultFactory().createBinaryDecoder(dataBytes, null);
        GenericDatumReader<Object> reader = null;
        try {
            reader = new GenericDatumReader<Object>(typeDefWriter, typeDef);
            // writer's schema
            reader.setSchema(typeDefWriter);

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   @Override
   public Object objectFromByteBuffer(byte[] buf, int offset, int length) throws IOException {
      DecoderFactory factory = new DecoderFactory(); // TODO: Could this be cached?
      InputStream is = new ByteArrayInputStream(buf, offset, length);
      Decoder decoder = factory.createBinaryDecoder(is, null);
      return objectFromByteBuffer(decoder);
   }

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    writer.write(b, e);
    e.flush();
    ReflectDatumReader<AnotherSampleRecord> reader = 
      new ReflectDatumReader<AnotherSampleRecord>(schm);
    ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
    Decoder d = DecoderFactory.defaultFactory().createBinaryDecoder(in, null);
    AnotherSampleRecord decoded = reader.read(null, d);
    assertEquals(a, decoded);
    decoded = reader.read(null, d);
    assertEquals(b, decoded);
  }

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