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

Methods

Modifier and Type	Method and Description
static NullWritable	get() Returns the single instance of this class.
void	readFields(DataInput in) Reads the fields of this object from in.
void	write(DataOutput out) Writes the fields of this object to out.

Methods inherited from class java.lang.Object

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

Method Detail

get

public static NullWritable get()

Returns the single instance of this class.

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from interface: Writable

Reads 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

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Description copied from interface: Writable

Writes the fields of this object to out.

Specified by:

write in interface Writable

Throws:

IOException