How to find only the files with unique valid content in a directory with Camel

unique_content_files.java

package com.sc;

import org.apache.camel.Exchange;
import org.apache.camel.Handler;
import org.apache.camel.Header;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.processor.idempotent.MemoryIdempotentRepository;

/**
 * A Camel Java DSL Router
 */
public class MyRouteBuilder extends RouteBuilder {
	
	private int counter = 0;
	
	/**
	 * The incoming file name has the timestamp as part of it, so we are just replacing that with a counter
	 * @param fileName
	 * @return
	 */
	@Handler
	public String setFileName(@Header(Exchange.FILE_NAME) String fileName) {
		return fileName.replaceAll("\\d+", Integer.toString(counter++));
	}

    public void configure() {
    	
    	/*
    	 * Read in all the files in a directory, filter by file name, filter by valid content,
    	 * use idempotentConsumer to exclude duplicate file content, rename the file, write the file
    	 */
        from("file:src/data/m-footbl?noop=true")
        	.filter(header(Exchange.FILE_NAME).contains("ftp"))
        	.filter(body().startsWith("<fbgame"))
        	.idempotentConsumer(body(String.class), MemoryIdempotentRepository.memoryIdempotentRepository(1000))
        	.setHeader(Exchange.FILE_NAME, method(MyRouteBuilder.class))
		.to("file:src/data/m-footbl-uniq")
        ;
    }

}