@Override
  public ByteRange get(int index, byte[] dst) {
    if (0 == dst.length) {
      return this;
    }

    return get(index, dst, 0, dst.length);
  }
Returns true when {@code range} is of zero length, false otherwise.
hbase-common/src/main/java/org/apache/hadoop/hbase/util/AbstractByteRange.java