title: Does camel allow to understand previous(source) pipileine in case of multiple from statements?
body: <p>camel route:</p>
  
  <pre><code> from("file://" + REST_FILES + "?idempotent=true")
       .from("file://" + FTP_FILES + "?idempotent=true")
       .process(new Processor() {
           @Override
           public void process(Exchange exchange) {
           }
  </code></pre>
  
  <p>Is it possible to understand inside <code>process</code> method - was exchange obtained from REST_FILES or from FTP_FILES ?</p>