RADAR CTLR AT BAY APCH VECTORED A B757 FOR A RWY DIFFERENT THAN WAS BROADCAST ON THE CURRENT ATIS.

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AS WE APCHED LANDFALL; SJC ATIS CALLED FOR EITHER A VOR OR VISUAL APCH TO RWY 30R. AT LANDFALL; IT WAS EVIDENT THAT A VISUAL APCH COULD NOT BE CONDUCTED; SO WE SET UP FOR THE VOR RWY 30R APCH. ATIS WAS RECHKED AND STILL FOUND TO BE THE SAME. BAY APCH GAVE US A HDG OF 030 DEGS WHICH WE ASSUMED WAS A DELAY VECTOR. BAY THEN GAVE US A HDG OF 300 DEGS AND THEN 290 DEGS. BOTH OF THESE WERE ASSUMED TO DELAY VECTORS. BAY APCH NEVER AT ANY TIME MENTIONED THE RWY OR APCH TO BE USED. AT ABOUT 8 MI FROM THE SJC VOR WE WERE TURNED TO 090 DEGS; CLRED TO 3000 FT AND CLRED FOR THE VOR-A APCH TO RWY 12L. THIS WAS QUITE A SURPRISE; BUT DUE TO HAVING THE SJC CHARTS OUT; AND QUICKLY SETTING UP THE FMC; RADIO ALTIMETER; MDA; AND VOR SETTINGS A NORMAL APCH WAS CONDUCTED. ATC SHOULD HAVE TOLD US OF THE CHANGE IN RWY AND APCH. UPON BEING HANDED OVER TO A STRANGE APCH FREQ (NORMAL IS 120.1) AND BEING ISSUED NON NORMAL HDGS; WE SHOULD HAVE QUERIED BAY APCH AS TO WHAT WAS GOING ON. EXAMPLE: 'IS THIS A DELAY VECTOR?' 'IS THIS FOR RWY 30R?' IN A STRANGE ENVIRONMENT; REFUSAL OF THE APCH CLRNC WOULD HAVE BEEN PROPER ACTION.