Character

If a person does something generous for another person, but does it ultimately for their own personal gain, is this person still considered a generous person? I've been thinking about how, and to what extent I define character traits (in myself and others)...and thinking it all the way through, or at least as far as I seem to get, I realize that unless a person exhibits a behavior with some degree of altruism, I don't necessarily apply that to their character as an individual. It's something they DID, not something they ARE. I don't know if this fair, but it's how I feel most times...what do you guys think? I'd love some feedback from others on this...