org.apache.hadoop.io
Class NullWritable

java.lang.Object
  org.apache.hadoop.io.NullWritable

All Implemented Interfaces:

Writable

public class NullWritable
extends Object
implements Writable

Singleton Writable with no data.

Method Summary

static NullWritable	get() Returns the single instance of this class.
void	readFields(DataInput in) Deserialize the fields of this object from in.
String	toString()
void	write(DataOutput out) Serialize the fields of this object to out.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

get

public static NullWritable get()

Returns the single instance of this class.

toString

public String toString()

Overrides:

toString in class Object

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from interface: Writable

Deserialize the fields of this object from in.

For efficiency, implementations should attempt to re-use storage in the existing object where possible.

Specified by:

readFields in interface Writable

Parameters:

in - DataInput to deseriablize this object from.

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Description copied from interface: Writable

Serialize the fields of this object to out.

Specified by:

write in interface Writable

Parameters:

out - DataOuput to serialize this object into.

Throws:

IOException