i smashed my ring finger on my left hand in the gym today. its VERY swollen and hard and blue and purple now. i cant really move it. how long will it take to heal? i have bjj on tuesday.

If it's broken, no training. If it's just bruised, yes training.

i trained with a bon chip and sprained fingures. its all about how you train taping the joint and listening to your body if it hurts to much or the pain changes or the joint wont do the job your body is telling you to stop. play it by what your body says and ice it after every training session.

yes

if you can type you can train

tape it to the one next to it

I'm a doctor, and I say "YES"

i say turn up and see how it goes. you can use it as an excuse if you get tapped.

tape it to the one next to it
If it's not broken this is the answer. Tape the bottom and middle sections. Do not tape the joints. Don't tape it too tight, SLIGHTLY loose is good. Keep taped for 8 months. Really keep it taped an extra week or 2 after you think it's healed. This is the easiest thing to reinjure.