Output filenames depends on input filenames

Suppose you have directory with many files like
unicorns.xml dogs.xml cats.xml birds.xml etc

You use MultiItemResourceReader and specify only directory to read all files in batch job:

HTML Code:

---

    <bean id="multiResourceReader"
          scope="step"
          class="org.springframework.batch.item.file.MultiResourceItemReader">
        <property name="resources" value="${input.files}" />
        <property name="delegate" ref="oneFileReader" />
    </bean>

---

What is the simplest way to write output files in other directory with similar names after processing?

Like unicorns.out.xml dogs.out.xml birds.out.xml