code: public void setFileExtensions(String fileExtensions) {
  		if ("".equals(fileExtensions.trim()))
  			return;
  		String[] split = fileExtensions.split("\\s*,\\s*");
  		for (String string : split) {
  			this.fileExtensions.add(string);
  		}
  	}
docs: Sets the fileExtension the generated {@link org.eclipse.emf.ecore.resource.Resource.Factory} should be registered
  to.
  
  @param fileExtensions