com.google.cloud.dataflow.sdk.coders

Class SetCoder<T>

java.lang.Object

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

Method Summary

Methods

Modifier and Type	Method and Description
java.util.Set<T>	decode(java.io.InputStream inStream, Coder.Context context) Decodes a value of type T from the given input stream in the given context.
void	encode(java.util.Set<T> set, java.io.OutputStream outStream, Coder.Context context) Encodes the given value of type T onto the given output stream in the given context.
java.util.List<? extends Coder<?>>	getCoderArguments() If this is a Coder for a parameterized type, returns the list of Coders being used for each of the parameters, or returns null if this cannot be done or this is not a parameterized type.
Coder<T>	getElementCoder()
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)
void	registerByteSizeObserver(java.util.Set<T> set, com.google.cloud.dataflow.sdk.util.common.ElementByteSizeObserver observer, Coder.Context context) Notifies ElementByteSizeObserver about the byte size of the encoded value using this coder.

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

asCloudObject, equals, getComponents, getEncodedElementByteSize, hashCode, isRegisterByteSizeObserverCheap, toString

Methods inherited from class java.lang.Object

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

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)

getElementCoder

public Coder<T> getElementCoder()

encode

public void encode(java.util.Set<T> set,
          java.io.OutputStream outStream,
          Coder.Context context)
            throws java.io.IOException,
                   CoderException

Description copied from interface: Coder

Encodes the given value of type T onto the given output stream in the given context.

Throws:

java.io.IOException - if writing to the OutputStream fails for some reason

CoderException - if the value could not be encoded for some reason

decode

public java.util.Set<T> decode(java.io.InputStream inStream,
                      Coder.Context context)
                        throws java.io.IOException,
                               CoderException

Description copied from interface: Coder

Decodes a value of type T from the given input stream in the given context. Returns the decoded value.

Throws:

java.io.IOException - if reading from the InputStream fails for some reason

CoderException - if the value could not be decoded for some reason

getCoderArguments

public java.util.List<? extends Coder<?>> getCoderArguments()

Description copied from interface: Coder

If this is a Coder for a parameterized type, returns the list of Coders being used for each of the parameters, or returns null if this cannot be done or this is not a parameterized type.

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.

registerByteSizeObserver

public void registerByteSizeObserver(java.util.Set<T> set,
                            com.google.cloud.dataflow.sdk.util.common.ElementByteSizeObserver observer,
                            Coder.Context context)
                              throws java.lang.Exception

Notifies ElementByteSizeObserver about the byte size of the encoded value using this coder.

Specified by:

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

Overrides:

registerByteSizeObserver in class StandardCoder<java.util.Set<T>>

Throws:

java.lang.Exception