@AssertTrue(message = "withMarkers can only be supplied when FileReadingMode is 'lines'")
	public boolean isWithMarkersValid() {
		if (this.withMarkers != null && !FileReadingMode.lines.equals(this.fileReadingmode)) {
			return false;
		}
		else {
			return true;
		}
	}
A mixin that can be used every time a module dealing with Files offers
the choice to pass along the File itself or its contents.

@author Eric Bottard
@author Gunnar Hillert
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/modules/metadata/FileAsRefMixin.java