Examples of org.apache.avro.io.BinaryEncoder

org.apache.avro.io.BinaryEncoder
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.) @see Decoder

                                  DatumWriter<Object> writer,
                                  DatumReader<Object> reader)
    throws IOException {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    writer.setSchema(schema);
    writer.write(datum, new BinaryEncoder(out));
    byte[] data = out.toByteArray();


    reader.setSchema(schema);
        
    Object decoded =

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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 = new BinaryEncoder(out);
    writer.write("Y", encoder);
    writer.write("X", encoder);
    byte[] data = out.toByteArray();
    Decoder decoder = DecoderFactory.defaultFactory().createBinaryDecoder(
        data, null);

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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);
    writer.write(datum, new BinaryEncoder(out));
    return out.toByteArray();
  }

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    checkReadWrite(object, ReflectData.get().getSchema(object.getClass()));
  }
  void checkReadWrite(Object object, Schema s) throws Exception {
    ReflectDatumWriter<Object> writer = new ReflectDatumWriter<Object>(s);
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    writer.write(object, new BinaryEncoder(out));
    ReflectDatumReader<Object> reader = new ReflectDatumReader<Object>(s);
    Object after =
      reader.read(null, DecoderFactory.defaultFactory().createBinaryDecoder(
          out.toByteArray(), null));
    assertEquals(object, after);

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      new ReflectDatumWriter<SampleRecord>(schm);
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    SampleRecord record = new SampleRecord();
    record.x = 5;
    record.y = 10;
    writer.write(record, new BinaryEncoder(out));
    ReflectDatumReader<SampleRecord> reader = 
      new ReflectDatumReader<SampleRecord>(schm);
    SampleRecord decoded =
      reader.read(null, DecoderFactory.defaultFactory().createBinaryDecoder(
          out.toByteArray(), null));

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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
    BinaryEncoder e = new BinaryEncoder(out);
    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.defaultFactory().createBinaryDecoder(in, null);
    AnotherSampleRecord decoded = reader.read(null, d);

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     * @param o Object to serialize
     */
    public static <T extends SpecificRecord> ByteBuffer serialize(T o) throws IOException
    {
        OutputBuffer buff = new OutputBuffer();
        BinaryEncoder enc = new BinaryEncoder(buff);
        SpecificDatumWriter<T> writer = new SpecificDatumWriter<T>(o.getSchema());
        writer.write(o, enc);
        enc.flush();
        return ByteBuffer.wrap(buff.asByteArray());
    }

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     * @param o Object to serialize
     */
    public static <T extends SpecificRecord> ByteBuffer serializeWithSchema(T o) throws IOException
    {
        OutputBuffer buff = new OutputBuffer();
        BinaryEncoder enc = new BinaryEncoder(buff);
        enc.writeString(new Utf8(o.getSchema().toString()));
        SpecificDatumWriter<T> writer = new SpecificDatumWriter<T>(o.getSchema());
        writer.write(o, enc);
        enc.flush();
        return ByteBuffer.wrap(buff.asByteArray());
    }

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    return READER.read(null, new BinaryDecoder(new ByteArrayInputStream(array)));
  }


  public byte[] serialize(GenericRecord content) throws Exception {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    WRITER.write(content, new BinaryEncoder(out));
    return out.toByteArray();
  }

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      READER.read(null, new BinaryDecoder(new ByteArrayInputStream(array)));
  }


  public byte[] serialize(MediaContent content) throws Exception {
    ByteArrayOutputStream out = new ByteArrayOutputStream();
    WRITER.write(content, new BinaryEncoder(out));
    return out.toByteArray();
  }

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