org.apache.beam.sdk.values

Class TimestampedValue.TimestampedValueCoder<T>

java.lang.Object

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

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

org.apache.beam.sdk.values.TimestampedValue.TimestampedValueCoder<T>

All Implemented Interfaces:

java.io.Serializable

Enclosing class:

TimestampedValue<V>

public static class TimestampedValue.TimestampedValueCoder<T>
extends StructuredCoder<TimestampedValue<T>>

A Coder for TimestampedValue.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.beam.sdk.coders.Coder

Coder.Context, Coder.NonDeterministicException

Method Summary

Modifier and Type	Method and Description
TimestampedValue<T>	decode(java.io.InputStream inStream) Decodes a value of type T from the given input stream in the given context.
void	encode(TimestampedValue<T> windowedElem, java.io.OutputStream outStream) Encodes the given value of type T onto the given output stream.
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 in the same order they appear within the parameterized type's type signature.
java.util.List<? extends Coder<?>>	getComponents() Returns the list of Coders that are components of this Coder.
TypeDescriptor<TimestampedValue<T>>	getEncodedTypeDescriptor() Returns the TypeDescriptor for the type encoded.
Coder<T>	getValueCoder()
static <T> TimestampedValue.TimestampedValueCoder<T>	of(Coder<T> valueCoder)
java.lang.Object	structuralValue(TimestampedValue<T> value) Returns an object with an Object.equals() method that represents structural equality on the argument.
void	verifyDeterministic() Throw Coder.NonDeterministicException if the coding is not deterministic.

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

equals, hashCode, toString

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

consistentWithEquals, decode, encode, getEncodedElementByteSize, isRegisterByteSizeObserverCheap, registerByteSizeObserver, verifyDeterministic, verifyDeterministic

Methods inherited from class java.lang.Object

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

Method Detail

of

public static <T> TimestampedValue.TimestampedValueCoder<T> of(Coder<T> valueCoder)

structuralValue

public java.lang.Object structuralValue(TimestampedValue<T> value)

Description copied from class: Coder

Returns an object with an Object.equals() method that represents structural equality on the argument.

For any two values x and y of type T, if their encoded bytes are the same, then it must be the case that structuralValue(x).equals(structuralValue(y)).

Most notably:

• The structural value for an array coder should perform a structural comparison of the contents of the arrays, rather than the default behavior of comparing according to object identity.
• The structural value for a coder accepting null should be a proper object with an equals() method, even if the input value is null.

See also Coder.consistentWithEquals().

By default, if this coder is Coder.consistentWithEquals(), and the value is not null, returns the provided object. Otherwise, encodes the value into a byte[], and returns an object that performs array equality on the encoded bytes.

Overrides:

structuralValue in class Coder<TimestampedValue<T>>

encode

public void encode(TimestampedValue<T> windowedElem,
                   java.io.OutputStream outStream)
            throws java.io.IOException

Description copied from class: Coder

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

Specified by:

encode in class Coder<TimestampedValue<T>>

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 TimestampedValue<T> decode(java.io.InputStream inStream)
                           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.

Specified by:

decode in class Coder<TimestampedValue<T>>

Throws:

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

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

verifyDeterministic

public void verifyDeterministic()
                         throws Coder.NonDeterministicException

Description copied from class: Coder

Throw Coder.NonDeterministicException if the coding is not deterministic.

In order for a Coder to be considered deterministic, the following must be true:

• two values that compare as equal (via Object.equals() or Comparable.compareTo(), if supported) have the same encoding.
• the Coder always produces a canonical encoding, which is the same for an instance of an object even if produced on different computers at different times.

Specified by:

verifyDeterministic in class Coder<TimestampedValue<T>>

Throws:

Coder.NonDeterministicException - if this coder is not deterministic.

getCoderArguments

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

Description copied from class: Coder

If this is a Coder for a parameterized type, returns the list of Coders being used for each of the parameters in the same order they appear within the parameterized type's type signature. If this cannot be done, or this Coder does not encode/decode a parameterized type, returns the empty list.

Specified by:

getCoderArguments in class Coder<TimestampedValue<T>>

getValueCoder

public Coder<T> getValueCoder()

getEncodedTypeDescriptor

public TypeDescriptor<TimestampedValue<T>> getEncodedTypeDescriptor()

Description copied from class: Coder

Returns the TypeDescriptor for the type encoded.

Overrides:

getEncodedTypeDescriptor in class Coder<TimestampedValue<T>>

getComponents

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

Description copied from class: StructuredCoder

Returns the list of Coders that are components of this Coder.

The default components will be equal to the value returned by Coder.getCoderArguments().

Overrides:

getComponents in class StructuredCoder<TimestampedValue<T>>