org.apache.storm.tuple

Class Fields

java.lang.Object

org.apache.storm.tuple.Fields

All Implemented Interfaces:

Serializable, Iterable<String>

public class Fields
extends Object
implements Iterable<String>, Serializable

Collection of unique named fields using in an ITuple

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Fields(List<String> fields)
Fields(String... fields)

Method Summary

Modifier and Type	Method and Description
boolean	contains(String field)
boolean	equals(Object other)
int	fieldIndex(String field) Returns the position of the specified named field.
String	get(int index) Gets the field at position index in the collection.
int	hashCode()
Iterator<String>	iterator()
List<Object>	select(Fields selector, List<Object> tuple) Select values out of tuple given a Fields selector Note that this function can throw a NullPointerException if the fields in selector are not found in the _index
int	size() Returns the number of fields in this collection.
List<String>	toList()
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

Fields

public Fields(String... fields)

Fields

public Fields(List<String> fields)

Method Detail

select

public List<Object> select(Fields selector,
                           List<Object> tuple)

Select values out of tuple given a Fields selector Note that this function can throw a NullPointerException if the fields in selector are not found in the _index

Parameters:

selector - Fields to select

tuple - tuple to select from

toList

public List<String> toList()

size

public int size()

Returns the number of fields in this collection.

get

public String get(int index)

Gets the field at position index in the collection.

Parameters:

index - index of the field to return

Throws:

IndexOutOfBoundsException -

• if the index is out of range (index < 0 || index >= size())

iterator

public Iterator<String> iterator()

Specified by:

iterator in interface Iterable<String>

fieldIndex

public int fieldIndex(String field)

Returns the position of the specified named field.

Parameters:

field - Named field to evaluate

Throws:

IllegalArgumentException -

• if field does not exist

contains

public boolean contains(String field)

Returns:

true if this contains the specified name of the field.

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object other)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object