/// <exception cref="System.IO.IOException"/>
protected internal virtual void ReadObject(Writable obj, DataInputStream inStream
)
{
int numBytes = WritableUtils.ReadVInt(inStream);
byte[] buffer;
// For BytesWritable and Text, use the specified length to set the length
// this causes the "obvious" translations to work. So that if you emit
// a string "abc" from C++, it shows up as "abc".
if (obj is BytesWritable)
{
buffer = new byte[numBytes];
inStream.ReadFully(buffer);
((BytesWritable)obj).Set(buffer, 0, numBytes);
}
else
{
if (obj is Text)
{
buffer = new byte[numBytes];
inStream.ReadFully(buffer);
((Text)obj).Set(buffer);
}
else
{
obj.ReadFields(inStream);
}
}
}
/// <summary>Utility method for testing writables.</summary>
/// <exception cref="System.Exception"/>
public static Writable TestWritable(Writable before, Configuration conf)
{
DataOutputBuffer dob = new DataOutputBuffer();
before.Write(dob);
DataInputBuffer dib = new DataInputBuffer();
dib.Reset(dob.GetData(), dob.GetLength());
Writable after = (Writable)ReflectionUtils.NewInstance(before.GetType(), conf);
after.ReadFields(dib);
Assert.Equal(before, after);
return(after);
}
/// <summary>Utility method for testing VersionedWritables.</summary>
/// <exception cref="System.Exception"/>
public static void TestVersionedWritable(Writable before, Writable after)
{
DataOutputBuffer dob = new DataOutputBuffer();
before.Write(dob);
DataInputBuffer dib = new DataInputBuffer();
dib.Reset(dob.GetData(), dob.GetLength());
try
{
after.ReadFields(dib);
}
catch (VersionMismatchException vmme)
{
System.Console.Out.WriteLine("Good, we expected this:" + vmme);
return;
}
throw new Exception("A Version Mismatch Didn't Happen!");
}