BytesFactory.java 文件源码

public static void updateObject(Writable obj, byte[] seed) {
  if (obj instanceof IntWritable) {
    ((IntWritable)obj).set(Ints.fromByteArray(seed));
  } else if (obj instanceof FloatWritable) {
    ((FloatWritable)obj).set(r.nextFloat());
  } else if (obj instanceof DoubleWritable) {
    ((DoubleWritable)obj).set(r.nextDouble());
  } else if (obj instanceof LongWritable) {
    ((LongWritable)obj).set(Longs.fromByteArray(seed));
  } else if (obj instanceof VIntWritable) {
    ((VIntWritable)obj).set(Ints.fromByteArray(seed));
  } else if (obj instanceof VLongWritable) {
    ((VLongWritable)obj).set(Longs.fromByteArray(seed));
  } else if (obj instanceof BooleanWritable) {
    ((BooleanWritable)obj).set(seed[0] % 2 == 1 ? true : false);
  } else if (obj instanceof Text) {
    ((Text)obj).set(BytesUtil.toStringBinary(seed));
  } else if (obj instanceof ByteWritable) {
    ((ByteWritable)obj).set(seed.length > 0 ? seed[0] : 0);
  } else if (obj instanceof BytesWritable) {
    ((BytesWritable)obj).set(seed, 0, seed.length);
  } else if (obj instanceof UTF8) {
    ((UTF8)obj).set(BytesUtil.toStringBinary(seed));
  } else if (obj instanceof MockValueClass) {
    ((MockValueClass)obj).set(seed);
  } else {
    throw new IllegalArgumentException("unknown writable: " +
                                       obj.getClass().getName());
  }
}