add Structure of Vickery Auction

VickreyAuction.sol

+pragma solidity ^0.4.4;
+import "DAuction.sol";
+
+contract DVickreyAuction is DAuction {
+
+    uint256 public bidDepositAmount;
+    uint256 public revealBlocksNum;
+    uint256 secondHighestBid;
+
+    bool refundCalled;
+    bool finalizeCalled;
+
+
+    // constructor
+    function DVickreyAuction(uint256 reservePrice, address judgeAddress, uint256 commitTimePeriod, uint256 revealTimePeriod, uint256 _bidDepositAmount) DAuction(reservePrice, commitTimePeriod, judgeAddress) {
+        bidDepositAmount = _bidDepositAmount;
+        revealBlockNum = revealTimePeriod; 
+    }
+
+    function commitBid(bytes32 bidCommitment) biddingOpen payable returns(bool) {
+        throw;
+    }
+
+    function revealBid(uint256 nonce) revealOpen payable returns(address highestBidder) {
+        throw;
+    }
+
+    function finalize() auctionover {
+        require(msg.sender == highestBidder);
+        require(!refundCalled && !finalizeCalled);
+        finalizeCalled=true;
+        creator.transfer(secondHighestBid);
+    }
+
+    function refund(uint256 refundAmount) auctionOver judgeOnly {
+        require(highestBidder!=0);
+        require(refundAmount<= this.balance);
+        require(!finalizeCalled && !refundCalled);
+        refundCalled=true;
+        highestBidder.transfer(refundAmount);
+        creator.transfer(secondHighestBid-refundAmount);
+    }
+
+    function withdraw() auctionover returns (uint){
+        throw;
+    }
+
+    modifier auctionover {
+        require(block.blockNum > startBlockNum+biddingBlocksNum+revealBlocksNum);
+        _;
+    }
+
+    modifier biddingOpen {
+        require(block.blockNum <= startBlockNum+biddingBlocksNum);
+        _;
+    }
+
+    modifier revealOpen {
+        require(block.blockNum > startBlockNum+biddingBlocksNum);
+        require(block.blockNum <= startBlockNum+biddingBlocksNum+revealBlocksNum);
+        _;
+    }
+
+}
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