com.hazelcast.jet.datamodel

Class ItemsByTag

java.lang.Object

com.hazelcast.jet.datamodel.ItemsByTag

public final class ItemsByTag
extends Object

A heterogeneous map from Tag<E> to E, where E can be different for each tag. The value associated with a tag may be null.

This is a less type-safe, but more flexible alternative to a tuple. The tuple has a fixed number of integer-indexed, statically-typed fields, and ItemsByTag has a variable number of tag-indexed fields whose whose static type is encoded in the tags.

Since:

Jet 3.0

Constructor Summary

Constructors

Constructor and Description
ItemsByTag()

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
<E> E	get(Tag<E> tag) Retrieves the value associated with the supplied tag and throws an exception if there is none.
int	hashCode()
static ItemsByTag	itemsByTag(Object... tagsAndVals) Accepts an argument list of alternating tags and values, interprets them as a list of tag-value pairs, and returns an ItemsByTag populated with these pairs.
<E> void	put(Tag<E> tag, E value) Associates the supplied value with the supplied tag.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ItemsByTag

public ItemsByTag()

Method Detail

itemsByTag

@Nonnull
public static ItemsByTag itemsByTag(@Nonnull
                                             Object... tagsAndVals)

Accepts an argument list of alternating tags and values, interprets them as a list of tag-value pairs, and returns an ItemsByTag populated with these pairs.

get

@Nullable
public <E> E get(@Nonnull
                           Tag<E> tag)

Retrieves the value associated with the supplied tag and throws an exception if there is none. The tag argument must not be null, but the returned value may be, if a null value is explicitly associated with a tag.

Throws:

IllegalArgumentException - if there is no value associated with the supplied tag

put

public <E> void put(@Nonnull
                    Tag<E> tag,
                    @Nullable
                    E value)

Associates the supplied value with the supplied tag. The tag must not be null, but the value may be, and in that case the tag will be associated with a null value.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object