Can you do property substitution within the file URL? What I am trying to do is make the source and move directories properties?

Example:

      <from uri="file:${in.directory}?move=${archive.directory}/${date:now:yyyyMMdd}/${file:name.noext}.txt&amp;consumer.delay=1000&amp;readLock=rename&amp;readLockTimeout=1000&amp;maxMessagesPerPoll=100"/>

Error Results:

Caused by: java.lang.IllegalArgumentException: Invalid directory: ${in.directory}. Dynamic expressions with ${ } placeholders is not allowed. Use the fileName option to set the dynamic expression.

"Use the fileName option to set the dynamic expression." - what does this mean?

I tried make the file component into an endpoint http://camel.apache.org/how-do-i-use-spring-property-placeholder-with-camel-xml.html then I had trouble with the $ and $.

Thanks in advance,

Peter.