com.google.cloud.dataflow.sdk.coders

Class ListCoder<T>

java.lang.Object

com.google.cloud.dataflow.sdk.coders.StandardCoder<IT>

com.google.cloud.dataflow.sdk.coders.IterableLikeCoder<T,java.util.List<T>>

com.google.cloud.dataflow.sdk.coders.ListCoder<T>

Type Parameters:

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

All Implemented Interfaces:

Coder<java.util.List<T>>, java.io.Serializable

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

A ListCoder encodes Lists.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface com.google.cloud.dataflow.sdk.coders.Coder

Coder.Context

Method Summary

Methods

Modifier and Type	Method and Description
protected java.util.List<T>	decodeToIterable(java.util.List<T> decodedElements) Builds an instance of the coder's associated Iterable from a list of decoded elements.
static <T> java.util.List<java.lang.Object>	getInstanceComponents(java.util.List<T> exampleValue) Returns the first element in this list if it is non-empty, otherwise returns null.
boolean	isDeterministic() List sizes are always known, so ListIterable may be deterministic while the general IterableLikeCoder is not.
static <T> ListCoder<T>	of(Coder<T> elemCoder)
static ListCoder<?>	of(java.util.List<Coder<?>> components)

Methods inherited from class com.google.cloud.dataflow.sdk.coders.IterableLikeCoder

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

Methods inherited from class com.google.cloud.dataflow.sdk.coders.StandardCoder

asCloudObject, equals, getComponents, getEncodedElementByteSize, hashCode, toString

Methods inherited from class java.lang.Object

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

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 the coder's associated Iterable from a list of decoded elements. If IT is a supertype of List<T>, the derived class implementation is permitted to return decodedElements directly.

Specified by:

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

of

public static ListCoder<?> of(java.util.List<Coder<?>> components)

getInstanceComponents

public static <T> java.util.List<java.lang.Object> getInstanceComponents(java.util.List<T> exampleValue)

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

isDeterministic

public boolean isDeterministic()

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

Specified by:

isDeterministic in interface Coder<java.util.List<T>>

Overrides:

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