org.apache.beam.sdk.coders

Class CollectionCoder<T>

java.lang.Object

org.apache.beam.sdk.coders.StandardCoder<IterableT>

org.apache.beam.sdk.coders.IterableLikeCoder<T,Collection<T>>

org.apache.beam.sdk.coders.CollectionCoder<T>

All Implemented Interfaces:

Serializable, Coder<Collection<T>>

public class CollectionCoder<T>
extends IterableLikeCoder<T,Collection<T>>

A CollectionCoder encodes Collections in the format of IterableLikeCoder.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.beam.sdk.coders.Coder

Coder.Context, Coder.NonDeterministicException

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CollectionCoder(Coder<T> elemCoder)

Method Summary

Modifier and Type	Method and Description
protected Collection<T>	decodeToIterable(List<T> decodedElements) Builds an instance of IterableT, this coder's associated Iterable-like subtype, from a list of decoded elements.
static <T> List<Object>	getInstanceComponents(Collection<T> exampleValue) Returns the first element in this collection if it is non-empty, otherwise returns null.
static <T> CollectionCoder<T>	of(Coder<T> elemCoder)
static CollectionCoder<?>	of(List<Object> components)

Methods inherited from class org.apache.beam.sdk.coders.IterableLikeCoder

decode, encode, getCoderArguments, getElemCoder, getInstanceComponentsHelper, isRegisterByteSizeObserverCheap, registerByteSizeObserver, verifyDeterministic

Methods inherited from class org.apache.beam.sdk.coders.StandardCoder

asCloudObject, consistentWithEquals, equals, getAllowedEncodings, getComponents, getEncodedElementByteSize, getEncodingId, hashCode, structuralValue, toString, verifyDeterministic, verifyDeterministic

Methods inherited from class java.lang.Object

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

Constructor Detail

CollectionCoder

protected CollectionCoder(Coder<T> elemCoder)

Method Detail

of

public static <T> CollectionCoder<T> of(Coder<T> elemCoder)

decodeToIterable

protected final Collection<T> decodeToIterable(List<T> decodedElements)

Builds an instance of IterableT, this coder's associated Iterable-like subtype, from a list of decoded elements.

Specified by:

decodeToIterable in class IterableLikeCoder<T,Collection<T>>

Returns:

the decoded elements directly, since List is a subtype of Collection.

of

public static CollectionCoder<?> of(List<Object> components)

getInstanceComponents

public static <T> List<Object> getInstanceComponents(Collection<T> exampleValue)

Returns the first element in this collection if it is non-empty, otherwise returns null.