pekko/akka-docs/rst/java/http/routing-dsl/directives/basic-directives/mapRouteResultPF.rst

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.. _-mapRouteResultPF-java-:
mapRouteResultPF
================
Description
-----------
*Partial Function* version of :ref:`-mapRouteResult-java-`.
Changes the message the inner route sends to the responder.
The ``mapRouteResult`` directive is used as a building block for :ref:`Custom Directives-java` to transform the
:class:`RouteResult` coming back from the inner route. It's similar to the :ref:`-mapRouteResult-java-` directive but allows to
specify a partial function that doesn't have to handle all potential ``RouteResult`` instances.
See :ref:`Result Transformation Directives-java` for similar directives.
Example
-------
.. includecode:: ../../../../code/docs/http/javadsl/server/directives/BasicDirectivesExamplesTest.java#mapRouteResultPF