code: protected boolean isBinaryResource(String resourcePath) {
  		String extension = FileNameUtils.getExtension(resourcePath);
  		if (extension != null) {
  			extension = extension.toLowerCase();
  		}
  		return MIMETypesSupport.getSupportedProperties(this).containsKey(extension);
  	}
docs: Checks if the resource is an binary resource
  
  @param resourcePath
  the resourcePath
  @return true if the resource is an binary resource