org.apache.beam.sdk.coders

Class BooleanCoder

java.lang.Object

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

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

org.apache.beam.sdk.coders.AtomicCoder<java.lang.Boolean>

org.apache.beam.sdk.coders.BooleanCoder

All Implemented Interfaces:

java.io.Serializable

public class BooleanCoder
extends AtomicCoder<java.lang.Boolean>

A Coder for Boolean.

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

Constructor and Description
BooleanCoder()

Method Summary

Modifier and Type	Method and Description
boolean	consistentWithEquals() Returns true if this Coder is injective with respect to Object.equals(java.lang.Object).
java.lang.Boolean	decode(java.io.InputStream is) Decodes a value of type T from the given input stream in the given context.
void	encode(java.lang.Boolean value, java.io.OutputStream os) Encodes the given value of type T onto the given output stream.
protected long	getEncodedElementByteSize(java.lang.Boolean value) Returns the size in bytes of the encoded value using this coder.
boolean	isRegisterByteSizeObserverCheap(java.lang.Boolean value) Returns whether Coder.registerByteSizeObserver(T, org.apache.beam.sdk.util.common.ElementByteSizeObserver) cheap enough to call for every element, that is, if this Coder can calculate the byte size of the element to be coded in roughly constant time (or lazily).
static BooleanCoder	of() Returns the singleton instance of BooleanCoder.

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

equals, getCoderArguments, getComponents, hashCode, verifyDeterministic

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

toString

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

decode, encode, getEncodedTypeDescriptor, registerByteSizeObserver, structuralValue, verifyDeterministic, verifyDeterministic

Methods inherited from class java.lang.Object

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

Constructor Detail

BooleanCoder

public BooleanCoder()

Method Detail

of

public static BooleanCoder of()

Returns the singleton instance of BooleanCoder.

encode

public void encode(java.lang.Boolean value,
                   java.io.OutputStream os)
            throws java.io.IOException

Description copied from class: Coder

Encodes the given value of type T onto the given output stream. Multiple elements can be encoded next to each other on the output stream, each coder should encode information to know how many bytes to read when decoding. A common approach is to prefix the encoding with the element's encoded length.

Specified by:

encode in class Coder<java.lang.Boolean>

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.lang.Boolean decode(java.io.InputStream is)
                         throws java.io.IOException

Description copied from class: Coder

Decodes a value of type T from the given input stream in the given context. Returns the decoded value. Multiple elements can be encoded next to each other on the input stream, each coder should encode information to know how many bytes to read when decoding. A common approach is to prefix the encoding with the element's encoded length.

Specified by:

decode in class Coder<java.lang.Boolean>

Throws:

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

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

consistentWithEquals

public boolean consistentWithEquals()

Description copied from class: Coder

Returns true if this Coder is injective with respect to Object.equals(java.lang.Object).

Whenever the encoded bytes of two values are equal, then the original values are equal according to Objects.equals(). Note that this is well-defined for null.

This condition is most notably false for arrays. More generally, this condition is false whenever equals() compares object identity, rather than performing a semantic/structural comparison.

By default, returns false.

Overrides:

consistentWithEquals in class Coder<java.lang.Boolean>

isRegisterByteSizeObserverCheap

public boolean isRegisterByteSizeObserverCheap(java.lang.Boolean value)

Description copied from class: Coder

Returns whether Coder.registerByteSizeObserver(T, org.apache.beam.sdk.util.common.ElementByteSizeObserver) cheap enough to call for every element, that is, if this Coder can calculate the byte size of the element to be coded in roughly constant time (or lazily).

Not intended to be called by user code, but instead by PipelineRunner implementations.

By default, returns false. The default Coder.registerByteSizeObserver(T, org.apache.beam.sdk.util.common.ElementByteSizeObserver) implementation invokes Coder.getEncodedElementByteSize(T) which requires re-encoding an element unless it is overridden. This is considered expensive.

Overrides:

isRegisterByteSizeObserverCheap in class Coder<java.lang.Boolean>

getEncodedElementByteSize

protected long getEncodedElementByteSize(java.lang.Boolean value)
                                  throws java.lang.Exception

Description copied from class: Coder

Returns the size in bytes of the encoded value using this coder.

Overrides:

getEncodedElementByteSize in class Coder<java.lang.Boolean>

Throws:

java.lang.Exception