com.google.cloud.dataflow.sdk.coders

Class SetCoder<T>

java.lang.Object

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

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

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

Type Parameters:

T - the type of the elements of the set

All Implemented Interfaces:

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

public class SetCoder<T>
extends IterableLikeCoder<T,java.util.Set<T>>

A SetCoder encodes Sets.

See Also:

Serialized Form

Nested Class Summary

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

Coder.Context

Constructor Summary

Constructors

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

Method Summary

Methods

Modifier and Type	Method and Description
protected java.util.Set<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.Set<T> exampleValue) Returns the first element in this set if it is non-empty, otherwise returns null.
boolean	isDeterministic() Not all sets have a deterministic encoding.
static <T> SetCoder<T>	of(Coder<T> elementCoder) Produces a SetCoder with the given elementCoder.
static SetCoder<?>	of(java.util.List<java.lang.Object> components) Dynamically typed constructor for JSON deserialization.

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

Constructor Detail

SetCoder

protected SetCoder(Coder<T> elemCoder)

Method Detail

of

public static <T> SetCoder<T> of(Coder<T> elementCoder)

Produces a SetCoder with the given elementCoder.

of

public static SetCoder<?> of(java.util.List<java.lang.Object> components)

Dynamically typed constructor for JSON deserialization.

isDeterministic

public boolean isDeterministic()

Not all sets have a deterministic encoding.

For example, HashSet comparison does not depend on element order, so two HashSet instances may be equal but produce different encodings.

Specified by:

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

Overrides:

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

getInstanceComponents

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

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

decodeToIterable

protected final java.util.Set<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.Set<T>>