code: @Override
  	@Nullable
  	public String getMapping(Method method) {
  
  		Assert.notNull(method, "Method must not be null!");
  		return getMapping(method.getDeclaringClass(), method);
  	}
docs: /*
  (non-Javadoc)
  @see org.springframework.hateoas.core.MappingDiscoverer#getMapping(java.lang.reflect.Method)