org.axonframework.serialization.upcasting

Class GenericUpcasterChain<T>

java.lang.Object

org.axonframework.serialization.upcasting.GenericUpcasterChain<T>

All Implemented Interfaces:

Upcaster<T>

Direct Known Subclasses:

EventUpcasterChain

public class GenericUpcasterChain<T>
extends Object
implements Upcaster<T>

Implementation of an Upcaster that is formed of a chain of other upcasters which are combined to upcast a stream of intermediate objects.

Author:

Rene de Waele

Constructor Summary

Constructors

Constructor and Description
GenericUpcasterChain(List<? extends Upcaster<T>> upcasters) Initializes an upcaster chain from the given list of upcasters.
GenericUpcasterChain(Upcaster<T>... upcasters) Initializes an upcaster chain from one or more upcasters.

Method Summary

Modifier and Type	Method and Description
protected List<? extends Upcaster<T>>	getUpcasters() Returns the list of upcasters that makes up this chain.
Stream<T>	upcast(Stream<T> initialRepresentations) Apply this upcaster to a stream of intermediateRepresentations and return the altered stream.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GenericUpcasterChain

@SafeVarargs
public GenericUpcasterChain(Upcaster<T>... upcasters)

Initializes an upcaster chain from one or more upcasters.

Parameters:

upcasters - the upcasters to chain

GenericUpcasterChain

public GenericUpcasterChain(List<? extends Upcaster<T>> upcasters)

Initializes an upcaster chain from the given list of upcasters.

Parameters:

upcasters - the upcasters to chain

Method Detail

upcast

public Stream<T> upcast(Stream<T> initialRepresentations)

Description copied from interface: Upcaster

Apply this upcaster to a stream of intermediateRepresentations and return the altered stream.

To upcast an object an upcaster should apply a mapping function to the input stream (Stream.map(Function)). To remove an object from the stream the upcaster should filter the input stream (Stream.filter(Predicate)). To split an input object into more than one objects use Stream.flatMap(Function).

In some cases the upcasting result of an Upcaster may depend on more than one input object. In that case an Upcaster may store state in the method during upcasting or even read ahead in the stream.

Specified by:

upcast in interface Upcaster<T>

Parameters:

initialRepresentations - The input stream of representations of objects

Returns:

the output stream of representations after applying the upcast function

getUpcasters

protected List<? extends Upcaster<T>> getUpcasters()

Returns the list of upcasters that makes up this chain.

Returns:

the upcaster chain