com.asakusafw.runtime.io.util

Class WritableUnion

java.lang.Object

com.asakusafw.runtime.io.util.WritableUnion

All Implemented Interfaces:

Union, org.apache.hadoop.io.Writable

Direct Known Subclasses:

AbstractDirectOutputValue

public class WritableUnion
extends Object
implements Union, org.apache.hadoop.io.Writable

An abstract implementation of union object.

Since:

0.2.5

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	WritableUnion(Class<?>... classes) Creates a new instance.
protected	WritableUnion(org.apache.hadoop.io.Writable... objects) Creates a new instance.

Method Summary

Modifier and Type	Method and Description
Object	getObject() Returns the current object in union.
int	getPosition() Returns the current position in union.
void	readFields(DataInput in)
Object	switchObject(int newPosition) Switches position and get its object.
String	toString()
void	write(DataOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

WritableUnion

protected WritableUnion(Class<?>... classes)

Creates a new instance.

Parameters:

classes - element classes

Throws:

IllegalArgumentException - if some parameters were null

WritableUnion

protected WritableUnion(org.apache.hadoop.io.Writable... objects)

Creates a new instance.

Parameters:

objects - elements

Throws:

IllegalArgumentException - if some parameters were null

Method Detail

getPosition

public final int getPosition()

Description copied from interface: Union

Returns the current position in union.

Specified by:

getPosition in interface Union

Returns:

the current position in union

switchObject

public Object switchObject(int newPosition)

Description copied from interface: Union

Switches position and get its object.

Specified by:

switchObject in interface Union

Parameters:

newPosition - the position to set

Returns:

the object

getObject

public final Object getObject()

Description copied from interface: Union

Returns the current object in union.

Specified by:

getObject in interface Union

Returns:

the current object

write

public void write(DataOutput out)
           throws IOException

Specified by:

write in interface org.apache.hadoop.io.Writable

Throws:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

Specified by:

readFields in interface org.apache.hadoop.io.Writable

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object