org.apache.flink.api.java.tuple

Class Tuple0

java.lang.Object

org.apache.flink.api.java.tuple.Tuple

org.apache.flink.api.java.tuple.Tuple0

All Implemented Interfaces:

Serializable

public class Tuple0
extends Tuple

A tuple with 0 fields.

The Tuple0 is a soft singleton, i.e., there is a "singleton" instance, but it does not prevent creation of additional instances.

See Also:

Tuple, Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static Tuple0	INSTANCE An immutable reusable Tuple0 instance

Fields inherited from class org.apache.flink.api.java.tuple.Tuple

MAX_ARITY

Constructor Summary

Constructors

Constructor and Description
Tuple0()

Method Summary

Methods

Modifier and Type	Method and Description
Tuple0	copy() Shallow tuple copy.
boolean	equals(Object o) Deep equality for tuples by calling equals() on the tuple members
int	getArity() Gets the number of field in the tuple (the tuple arity).
<T> T	getField(int pos) Gets the field at the specified position.
int	hashCode()
<T> void	setField(T value, int pos) Sets the field at the specified position.
String	toString() Creates a string representation of the tuple in the form "()"

Methods inherited from class org.apache.flink.api.java.tuple.Tuple

getFieldNotNull, getTupleClass

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final Tuple0 INSTANCE

An immutable reusable Tuple0 instance

Constructor Detail

Tuple0

public Tuple0()

Method Detail

getArity

public int getArity()

Description copied from class: Tuple

Gets the number of field in the tuple (the tuple arity).

Specified by:

getArity in class Tuple

Returns:

The number of fields in the tuple.

getField

public <T> T getField(int pos)

Description copied from class: Tuple

Gets the field at the specified position.

Specified by:

getField in class Tuple

Parameters:

pos - The position of the field, zero indexed.

Returns:

The field at the specified position.

setField

public <T> void setField(T value,
                int pos)

Description copied from class: Tuple

Sets the field at the specified position.

Specified by:

setField in class Tuple

Parameters:

value - The value to be assigned to the field at the specified position.

pos - The position of the field, zero indexed.

copy

public Tuple0 copy()

Shallow tuple copy.

Specified by:

copy in class Tuple

Returns:

A new Tuple with the same fields as this.

toString

public String toString()

Creates a string representation of the tuple in the form "()"

Overrides:

toString in class Object

Returns:

The string representation of the tuple.

equals

public boolean equals(Object o)

Deep equality for tuples by calling equals() on the tuple members

Overrides:

equals in class Object

Parameters:

o - the object checked for equality

Returns:

true if this is equal to o.

hashCode

public int hashCode()

Overrides:

hashCode in class Object