Redirect for non www to www and http to https

Hi can someone please help me? I urgently require some help with a redirect code (that will work) for my website (it is hosted on an apache server). What I require is a code that will redirect ALL traffic from non www to www as well as All traffic from HTTP to HTTPS. I have tried many codes but they either do not work fully or I get stuck on a redirect loop. So basically I want a code that will redirect: hxxp:// .example.com AND hxxp://www.example.com AND hxxps://.example.com TO hxxp://www.example.com

Please can anybody help with this?

(I have had to replace the t's in http & https for x's to allow the post)