Java & Apache-Camel: From direct-endpoint to file-endpoint

I've tried to build a route to copy files from one directory to an other directory. But instead of using:

from(file://source-directory).to(file://destination-directory)

I want to do something like this:

from(direct:start)
.to(direct:doStuff)
.to(direct:readDirectory)
.to(file://destination-folder)

I've done the following stuff:

Route

@Component
public class Route extends AbstractRouteBuilder {
@Override
public void configure() throws Exception {
from("direct:start")
.bean(lookup(ReadDirectory.class))
.split(body())
.setHeader("FILENAME", method(lookup(CreateFilename.class)))
.to("file:///path/to/my/output/directory/?fileName=${header.FILENAME}");
}

Processor

@Component
public class ReadDirectory implements CamelProcessorBean {
@Handler
public ImmutableList<File> apply(@Header("SOURCE_DIR") final String sourceDir) {
final File directory = new File(sourceDir);
final File[] files = directory.listFiles();
if (files == null) {
return ImmutableList.copyOf(Lists.<File>newArrayList());
}
return ImmutableList.copyOf(files);
}
}

I can start my route by using the following pseudo-Test (The point is I can manually start my route by producer.sendBodyAndHeader(..))

public class RouteIT extends StandardIT {
@Produce
private ProducerTemplate producer;
@Test
public void testRoute() throws Exception {
final String uri = "direct:start";
producer.sendBodyAndHeaders(uri, InOut, null, header());
}
private Map<String, Object> header() {
final Map<String, Object> header = Maps.newHashMap();
header.put("SOURCE_DIR", "/path/to/my/input/directory/");
return header;
}
}

• AbstractRouteBuilderextends SpringRouteBuilder
• CamelProcessorBean is only a Marker-Interface
• StandardIT loads SpringContext and stuff

The problem is, that I must set the filename. I've read some stuff that camel sets the header CamelFileNameProduced (during the file endpoint). It is a generic string with timestamp and if I don't set the filename - the written files will get this generic string as the filename.

My Question is: Is there a more beautiful solution to copy files (but starting with a direct-endpoint and read the directory in the middle of the route) and keep the filename for the destination? (I don't have to set the filename when I use from("file:source").to("file:destination"), why must I do it now?)