Package org.apache.beam.sdk.coders

Class CollectionCoder<T>

java.lang.Object

org.apache.beam.sdk.coders.Coder<Collection<T>>

org.apache.beam.sdk.coders.StructuredCoder<Collection<T>>

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

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

All Implemented Interfaces:

Serializable

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 class org.apache.beam.sdk.coders.Coder

Coder.Context, Coder.NonDeterministicException

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
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.
TypeDescriptor<Collection<T>>	getEncodedTypeDescriptor()	Returns the TypeDescriptor for the type encoded.
static <T> CollectionCoder<T>	of(Coder<T> elemCoder)

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

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

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

equals, getComponents, hashCode, toString

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

consistentWithEquals, decode, encode, getEncodedElementByteSize, getEncodedElementByteSizeUsingCoder, structuralValue, verifyDeterministic, verifyDeterministic

Methods inherited from class java.lang.Object

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

Constructor Details

CollectionCoder

protected CollectionCoder(Coder<T> elemCoder)

Method Details

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.

Override IterableLikeCoder.decodeToIterable(List, long, InputStream) if you need access to the terminator value and the InputStream.

Specified by:

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

Returns:

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

getEncodedTypeDescriptor

public TypeDescriptor<Collection<T>> getEncodedTypeDescriptor()

Description copied from class: Coder

Returns the TypeDescriptor for the type encoded.

Overrides:

getEncodedTypeDescriptor in class Coder<Collection<T>>