Is a denial of a writ of habeas corpus reviewed de novo?

The denial of a writ of habeas corpus is reviewed de novo. United States v. Angelone, 894 F.2d 1129 (9th Cir.1990). "To the extent it is necessary to review findings of fact, the clearly erroneous standard applies." Norris v. Risley, 878 F.2d 1178, 1180 (9th Cir.1989). In reviewing a district court's grant or denial of a habeas corpus petition, the factual determinations of the state court are entitled to a presumption of correctness. 28 U.S.C. 2254(d).