org.apache.beam.sdk.coders

Class ListCoder<T>

java.lang.Object

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

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

org.apache.beam.sdk.coders.IterableLikeCoder<T,java.util.List<T>>

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

Type Parameters:

T - the type of the elements of the Lists being transcoded

All Implemented Interfaces:

java.io.Serializable

public class ListCoder<T>
extends IterableLikeCoder<T,java.util.List<T>>

A Coder for List, using 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 and Description
protected	ListCoder(Coder<T> elemCoder)

Method Summary

Modifier and Type	Method and Description
protected java.util.List<T>	decodeToIterable(java.util.List<T> decodedElements) Builds an instance of IterableT, this coder's associated Iterable-like subtype, from a list of decoded elements.
TypeDescriptor<java.util.List<T>>	getEncodedTypeDescriptor() Returns the TypeDescriptor for the type encoded.
static <T> ListCoder<T>	of(Coder<T> elemCoder)
void	verifyDeterministic() List sizes are always known, so ListIterable may be deterministic while the general IterableLikeCoder is not.

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

decode, encode, getCoderArguments, getElemCoder, isRegisterByteSizeObserverCheap, registerByteSizeObserver

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, structuralValue, verifyDeterministic, verifyDeterministic

Methods inherited from class java.lang.Object

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

Constructor Detail

ListCoder

protected ListCoder(Coder<T> elemCoder)

Method Detail

of

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

decodeToIterable

protected final java.util.List<T> decodeToIterable(java.util.List<T> decodedElements)

Description copied from class: IterableLikeCoder

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,java.util.List<T>>

verifyDeterministic

public void verifyDeterministic()
                         throws Coder.NonDeterministicException

List sizes are always known, so ListIterable may be deterministic while the general IterableLikeCoder is not.

Overrides:

verifyDeterministic in class IterableLikeCoder<T,java.util.List<T>>

Throws:

Coder.NonDeterministicException - if this coder is not deterministic.

getEncodedTypeDescriptor

public TypeDescriptor<java.util.List<T>> getEncodedTypeDescriptor()

Description copied from class: Coder

Returns the TypeDescriptor for the type encoded.

Overrides:

getEncodedTypeDescriptor in class Coder<java.util.List<T>>