BytesFactory.java 文件源码

public static <VTYPE> byte[] toBytes(VTYPE obj) {
  final String className = obj.getClass().getName();
  if (className.equals(IntWritable.class.getName())) {
    return Ints.toByteArray(((IntWritable) obj).get());
  } else if (className.equals(FloatWritable.class.getName())) {
    return BytesUtil.toBytes(((FloatWritable) obj).get());
  } else if (className.equals(DoubleWritable.class.getName())) {
    return BytesUtil.toBytes(((DoubleWritable) obj).get());
  } else if (className.equals(LongWritable.class.getName())) {
    return Longs.toByteArray(((LongWritable) obj).get());
  } else if (className.equals(VIntWritable.class.getName())) {
    return Ints.toByteArray(((VIntWritable) obj).get());
  } else if (className.equals(VLongWritable.class.getName())) {
    return Longs.toByteArray(((VLongWritable) obj).get());
  } else if (className.equals(BooleanWritable.class.getName())) {
    return BytesUtil.toBytes(((BooleanWritable) obj).get());
  } else if (className.equals(Text.class.getName())) {
    return ((Text)obj).copyBytes();
  } else if (className.equals(ByteWritable.class.getName())) {
    return Ints.toByteArray((int) ((ByteWritable) obj).get());
  } else if (className.equals(BytesWritable.class.getName())) {
    // TODO: copyBytes instead?
    return ((BytesWritable) obj).getBytes();
  } else {
    return new byte[0];
  }
}