GroupByRowSuffixIterator.java 文件源码

public static VLongWritable getWritable(final Value v) {
  if (null == v) {
    throw new IllegalArgumentException("Value cannot be null");
  }

  ByteArrayInputStream bais = new ByteArrayInputStream(v.get());
  DataInputStream in = new DataInputStream(bais);

  VLongWritable writable = new VLongWritable();
  try {
    writable.readFields(in); 
  } catch (IOException e) {
    // If this ever happens, some seriously screwed up is happening or someone subclasses Value
    // and made it do crazy stuff.
    throw new RuntimeException(e);
  }

  return writable;
}