org.apache.flink.api.java.tuple

Class Tuple

java.lang.Object

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

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

Tuple0, Tuple1, Tuple10, Tuple11, Tuple12, Tuple13, Tuple14, Tuple15, Tuple16, Tuple17, Tuple18, Tuple19, Tuple2, Tuple20, Tuple21, Tuple22, Tuple23, Tuple24, Tuple25, Tuple3, Tuple4, Tuple5, Tuple6, Tuple7, Tuple8, Tuple9

public abstract class Tuple
extends Object
implements Serializable

The base class of all tuples. Tuples have a fix length and contain a set of fields, which may all be of different types. Because Tuples are strongly typed, each distinct tuple length is represented by its own class. Tuples exists with up to 25 fields and are described in the classes Tuple1 to Tuple25.

The fields in the tuples may be accessed directly a public fields, or via position (zero indexed) getField(int).

Tuples are in principle serializable. However, they may contain non-serializable fields, in which case serialization will fail.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_ARITY

Constructor Summary

Constructors

Constructor and Description
Tuple()

Method Summary

Methods

Modifier and Type	Method and Description
abstract <T extends Tuple> T	copy() Shallow tuple copy.
abstract int	getArity() Gets the number of field in the tuple (the tuple arity).
abstract <T> T	getField(int pos) Gets the field at the specified position.
<T> T	getFieldNotNull(int pos) Gets the field at the specified position, throws NullFieldException if the field is null.
static Class<? extends Tuple>	getTupleClass(int arity) Gets the class corresponding to the tuple of the given arity (dimensions).
abstract <T> void	setField(T value, int pos) Sets the field at the specified position.

Methods inherited from class java.lang.Object

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

Field Detail

MAX_ARITY

public static final int MAX_ARITY

See Also:

Constant Field Values

Constructor Detail

Tuple

public Tuple()

Method Detail

getField

public abstract <T> T getField(int pos)

Gets the field at the specified position.

Parameters:

pos - The position of the field, zero indexed.

Returns:

The field at the specified position.

Throws:

IndexOutOfBoundsException - Thrown, if the position is negative, or equal to, or larger than the number of fields.

getFieldNotNull

public <T> T getFieldNotNull(int pos)

Gets the field at the specified position, throws NullFieldException if the field is null. Used for comparing key fields.

Parameters:

pos - The position of the field, zero indexed.

Returns:

The field at the specified position.

Throws:

IndexOutOfBoundsException - Thrown, if the position is negative, or equal to, or larger than the number of fields.

NullFieldException - Thrown, if the field at pos is null.

setField

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

Sets the field at the specified position.

Parameters:

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

pos - The position of the field, zero indexed.

Throws:

IndexOutOfBoundsException - Thrown, if the position is negative, or equal to, or larger than the number of fields.

getArity

public abstract int getArity()

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

Returns:

The number of fields in the tuple.

copy

public abstract <T extends Tuple> T copy()

Shallow tuple copy.

Returns:

A new Tuple with the same fields as this.

getTupleClass

public static Class<? extends Tuple> getTupleClass(int arity)

Gets the class corresponding to the tuple of the given arity (dimensions). For example, getTupleClass(3) will return the Tuple3.class.

Parameters:

arity - The arity of the tuple class to get.

Returns:

The tuple class with the given arity.