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

                                 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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      ("{\"type\":\"enum\",\"name\":\"E\",\"symbols\":[\"X\",\"Y\"]}");
    Schema expected = Schema.parse
      ("{\"type\":\"enum\",\"name\":\"E\",\"symbols\":[\"Y\",\"Z\"]}");
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    DatumWriter<Object> writer = new GenericDatumWriter<Object>(actual);
    Encoder encoder = EncoderFactory.get().directBinaryEncoder(out, null);
    writer.write(new GenericData.EnumSymbol(actual, "Y"), encoder);
    writer.write(new GenericData.EnumSymbol(actual, "X"), encoder);
    encoder.flush();
    byte[] data = out.toByteArray();
    Decoder decoder = DecoderFactory.get().binaryDecoder(
        data, null);
    DatumReader<String> in = new GenericDatumReader<String>(actual, expected);
    assertEquals("Wrong value", new GenericData.EnumSymbol(expected, "Y"),

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  private static <T> byte[] render(T datum, Schema schema,
                               DatumWriter<T> writer)
    throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    writer.setSchema(schema);
    Encoder enc = new EncoderFactory().directBinaryEncoder(out, null);
    writer.write(datum, enc);
    enc.flush();
    return out.toByteArray();
  }

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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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    GenericRecord r = new GenericData.Record(s);
    r.put("f1", 100L);
    ByteArrayOutputStream bao = new ByteArrayOutputStream();
    GenericDatumWriter<GenericRecord> w =
      new GenericDatumWriter<GenericRecord>(s);
    Encoder e = EncoderFactory.get().jsonEncoder(s, bao);
    w.write(r, e);
    e.flush();
    
    Object o = new GenericDatumReader<GenericRecord>(s).read(null,
        DecoderFactory.get().jsonDecoder(s, new ByteArrayInputStream(bao.toByteArray())));
    assertEquals(r, o);
  }

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    int numObjects = Integer.parseInt(args[2]);
    
    FileOutputStream out = new FileOutputStream(outputFile, false);
    DatumWriter<Object> dout = new GenericDatumWriter<Object>();
    dout.setSchema(sch);
    Encoder vout = factory.directBinaryEncoder(out, null);
    vout.writeLong(numObjects); // metadata:the count of objects in the file
    
    for (Object datum : new RandomData(sch, numObjects)) {
      dout.write(datum, bufOut);
      blockCount++;
      if (buffer.size() >= SYNC_INTERVAL) {

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