Examples of org.apache.avro.io.Encoder

org.apache.avro.io.Encoder
Low-level support for serializing Avro values.
This class has two types of methods. One type of methods support the writing of leaf values (for example, {@link #writeLong} and{@link #writeString}). These methods have analogs in {@link Decoder}.
The other type of methods support the writing of maps and arrays. These methods are {@link #writeArrayStart}, {@link #startItem}, and {@link #writeArrayEnd} (and similar methods formaps). Some implementations of {@link Encoder} handle thebuffering required to break large maps and arrays into blocks, which is necessary for applications that want to do streaming. (See {@link #writeArrayStart} for details on these methods.)
{@link EncoderFactory} contains Encoder construction and configurationfacilities. @see EncoderFactory @see Decoder

    // Serialize the row
    byte[] serializedValue;
    try
    {
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      Encoder encoder = new BinaryEncoder(bos);
      GenericDatumWriter<GenericRecord> writer = new GenericDatumWriter<GenericRecord>(record.getSchema());
      writer.write(record, encoder);
      serializedValue = bos.toByteArray();
    }
    catch(IOException ex)

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   }


   @Override
   protected ByteBuffer objectToBuffer(Object o, int estimatedSize) throws IOException {
      ExposedByteArrayOutputStream baos = new ExposedByteArrayOutputStream(estimatedSize);
      Encoder encoder = new BinaryEncoder(baos);
      objectToBuffer(o, encoder);
      return new ByteBuffer(baos.getRawBuffer(), 0, baos.size());
   }

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  @Test
  public void test() throws IOException {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    EncoderFactory factory = EncoderFactory.get();
    Encoder e = factory.validatingEncoder(schema, 
        factory.binaryEncoder(baos, null));
    
    ResolvingGrammarGenerator.encode(e, schema, data);
    e.flush();
  }

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  private static <T> byte[] serializeWithReflectDatumWriter(T toSerialize, Class<T> toSerializeClass)
      throws IOException {
    ReflectDatumWriter<T> datumWriter = new ReflectDatumWriter<T>(toSerializeClass);
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    Encoder encoder = EncoderFactory.get().binaryEncoder(byteArrayOutputStream, null);
    datumWriter.write(toSerialize, encoder);
    encoder.flush();
    return byteArrayOutputStream.toByteArray();
  }

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    Schema schm = reflectData.getSchema(AnotherSampleRecord.class);
    ReflectDatumWriter<AnotherSampleRecord> writer = 
      new ReflectDatumWriter<AnotherSampleRecord>(schm);
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    // keep record.a null and see if that works
    Encoder e = factory.directBinaryEncoder(out, null);
    AnotherSampleRecord a = new AnotherSampleRecord();
    writer.write(a, e);
    AnotherSampleRecord b = new AnotherSampleRecord(10);
    writer.write(b, e);
    e.flush();
    ReflectDatumReader<AnotherSampleRecord> reader = 
      new ReflectDatumReader<AnotherSampleRecord>(schm);
    ByteArrayInputStream in = new ByteArrayInputStream(out.toByteArray());
    Decoder d = DecoderFactory.get().binaryDecoder(in, null);
    AnotherSampleRecord decoded = reader.read(null, d);

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                                 DatumReader<Object> reader,
                                 Object reuse)
    throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    writer.setSchema(schema);
    Encoder encoder = EncoderFactory.get().binaryEncoder(out, null);
    writer.write(datum, encoder);
    encoder.flush();
    byte[] data = out.toByteArray();


    reader.setSchema(schema);
        
    Object decoded =

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  public static void checkDirectBinary(Schema schema, Object datum,
      DatumWriter<Object> writer, DatumReader<Object> reader)
      throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    writer.setSchema(schema);
    Encoder encoder = EncoderFactory.get().directBinaryEncoder(out, null);
    writer.write(datum, encoder);
    // no flush for direct
    byte[] data = out.toByteArray();


    reader.setSchema(schema);

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  public static void checkBlockingBinary(Schema schema, Object datum,
      DatumWriter<Object> writer, DatumReader<Object> reader)
      throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    writer.setSchema(schema);
    Encoder encoder = EncoderFactory.get().blockingBinaryEncoder(out, null);
    writer.write(datum, encoder);
    encoder.flush();
    byte[] data = out.toByteArray();


    reader.setSchema(schema);


    Object decoded = reader.read(null, DecoderFactory.get()

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  private static void checkJson(Schema schema, Object datum,
                                DatumWriter<Object> writer,
                                DatumReader<Object> reader)
    throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    Encoder encoder = EncoderFactory.get().jsonEncoder(schema, out);
    writer.setSchema(schema);
    writer.write(datum, encoder);
    writer.write(datum, encoder);
    encoder.flush();
    byte[] data = out.toByteArray();


    reader.setSchema(schema);
    Decoder decoder = DecoderFactory.get().jsonDecoder(schema,
        new ByteArrayInputStream(data));

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  }


  private static void checkJson(Schema schema, Object datum,
                                String json) throws Exception {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    Encoder encoder = EncoderFactory.get().jsonEncoder(schema, out);
    DatumWriter<Object> writer = new GenericDatumWriter<Object>();
    writer.setSchema(schema);
    writer.write(datum, encoder);
    encoder.flush();
    byte[] data = out.toByteArray();


    String encoded = new String(data, "UTF-8");
    assertEquals("Encoded data does not match.", json, encoded);

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