CollectionCoder (Google Cloud Dataflow SDK 1.9.1 API)

Google Cloud Dataflow SDK for Java, version 1.9.1

Warning: Dataflow SDK 1.x for Java is unsupported as of October 16, 2018. After August 12, 2020, you can use unsupported SDKs temporarily while you upgrade your pipelines. For more information, see Using an unsupported SDK.

For information on migrating from the 1.x SDK, see Migrating from Dataflow SDK 1.x for Java.

Note: If you are using Cloud Dataflow SDK version 2.x, see the Apache Beam API reference documentation.

com.google.cloud.dataflow.sdk.coders

Class CollectionCoder<T>

• java.lang.Object
• • com.google.cloud.dataflow.sdk.coders.StandardCoder<IterableT>
  • • com.google.cloud.dataflow.sdk.coders.IterableLikeCoder<T,Collection<T>>
    • • com.google.cloud.dataflow.sdk.coders.CollectionCoder<T>

• All Implemented Interfaces:

  Coder<Collection<T>>, 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 interface com.google.cloud.dataflow.sdk.coders.Coder

      Coder.Context, Coder.NonDeterministicException

  • Constructor Summary

    Constructors 

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

  • Method Summary

    All Methods Static Methods Instance Methods Concrete Methods 

    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 com.google.cloud.dataflow.sdk.coders.IterableLikeCoder

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

    • Methods inherited from class com.google.cloud.dataflow.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.