@NotNull
	public FileReadingMode getMode() {
		return fileReadingmode;
	}
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