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


  private void check(Test test) throws Exception {


    ByteArrayOutputStream bao = new ByteArrayOutputStream();
    ThriftDatumWriter<Test> w = new ThriftDatumWriter<Test>(Test.class);
    Encoder e = EncoderFactory.get().binaryEncoder(bao, null);
    w.write(test, e);
    e.flush();
    
    Object o = new ThriftDatumReader<Test>(Test.class).read
      (null,
       DecoderFactory.get().createBinaryDecoder
       (new ByteArrayInputStream(bao.toByteArray()), null));

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   * @return  The binary encoded version of <tt>n</tt>.
   * @throws IOException
   */
  private static byte[] getBinary(Schema s, JsonNode n) throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    Encoder e = factory.binaryEncoder(out, null);
    encode(e, s, n);
    e.flush();
    return out.toByteArray();
  }

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    FileReader<Object> fileReader =
      new DataFileReader<Object>(new File(args.get(0)), reader);
    try {
      Schema schema = fileReader.getSchema();
      DatumWriter<Object> writer = new GenericDatumWriter<Object>(schema);
      Encoder encoder = new JsonEncoder(schema, (JsonGenerator)null);
      for (Object datum : fileReader) {
        // init() recreates the internal Jackson JsonGenerator
        encoder.init(out);
        writer.write(datum, encoder);
        encoder.flush();
        out.println();
      }
      out.flush();
    } finally {
      fileReader.close();

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   * @return  The binary encoded version of <tt>n</tt>.
   * @throws IOException
   */
  private static byte[] getBinary(Schema s, JsonNode n) throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    Encoder e = factory.binaryEncoder(out, null);
    encode(e, s, n);
    e.flush();
    return out.toByteArray();
  }

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  }


  @SuppressWarnings("unchecked")
  public static byte[] serialize(Object datum, Schema schema) {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    Encoder encoder = EncoderFactory.get().binaryEncoder(out, null);
    ReflectDatumWriter writer = new ReflectDatumWriter(schema);
    try {
      writer.write(datum, encoder);
      encoder.flush();
    } catch (IOException ex) {
      Throwables.propagate(ex);
    }
    return out.toByteArray();
  }

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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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