Package 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.
Since:
3.0
Author:
Rene de Waele

  • Constructor Details

    • 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 Details

    • 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(java.util.function.Function)). To remove an object from the stream the upcaster should filter the input stream (Stream.filter(java.util.function.Predicate)). To split an input object into more than one objects use Stream.flatMap(java.util.function.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