Will a court give shared custody to an abusive parent?

I’ve been married 8 years and during that time I’ve had 3 restraining orders against my husband. He has physically, once putting me in the hospital. I finally got free of him this last time while he was in jail for assaulting me. I’m ready to pursue divorce but we have a 15 year old son who says he wants to live with his father. They are very close, to the point that my son imitates his father’s behavior and treats me very badly. I do not want my son to grow up to be abusive and I don’t want his father to have custody. What are the chances that a judge would give this violent many shared or full custody of my son? Will what my son says he wants have any bearing on the judge’s decision?