computemasterpieceprice.java

该程序有17个java源文件。是经典奥斯波特艺术品商人软件工程例子

package Osbert;
import java.io.*;

public class ComputeMasterpiecePrice
{

  private static double ANNUAL_INTEREST = 1.085;
  // determines the maximum price to be offered for a masterpiece
  public static double getAlgorithmPrice (GalleryPainting masterpiece)
  throws IOException {
	  DataInputStream inFile;// stream object used for file input
	  double high;// keeps track of highest similarity
	  double algHigh;// price of most similar work
	  double temp;// number of matches on medium/subject
	  double auctionArea;// area of an auction painting
	  double galleryArea;// area of a gallery painting
	  int i;         // loop iterator for compound interest
	  Date highDate;  // date of most similar work
	  AuctionedPainting tempAuction;  // temporary object used for file reading
	  high = 0.0;
	  algHigh = 0.0;
	  highDate = Date.currentDate;
          inFile = new DataInputStream(new BufferedInputStream(new FileInputStream("auction.dat")));
	  tempAuction = new AuctionedPainting();

	  // loop through all of the auction objects and find the most similar work
	  while (inFile.available() != 0)
	  {
		  //
		  // read an auction object
		  //
		  tempAuction.readAuctionData (inFile);

		  temp = 0.0;

		  //
		  // if the artist names match, compute the similarity
		  //
		  if ((UserInterface.compareStr (tempAuction.getFirstName (), masterpiece.getFirstName()) == 0) &&
			  (UserInterface.compareStr (tempAuction.getLastName (), masterpiece.getLastName()) == 0))
		  {
			  if (masterpiece.getMedium().compareTo(tempAuction.getMedium ()) == 0)
				  temp++;

			  if (masterpiece.getSubject().compareTo(tempAuction.getSubject ()) == 0)
				  temp++;

			  auctionArea = tempAuction.getHeight () * tempAuction.getWidth ();
			  galleryArea = masterpiece.getHeight() * masterpiece.getWidth();

			  if (auctionArea > galleryArea)
				  temp = temp * galleryArea / auctionArea;
			  else
				  temp = temp * auctionArea / galleryArea;

			  //
			  // a higher similarity was found...
			  //
			  if (temp > high)
			  {
				  high = temp;
				  algHigh = tempAuction.getAuctionPrice ();
				  highDate = tempAuction.getAuctionDate ();
			  }

		  } // if ((compareStr (tempAuction.getFirstName (), firstName) == 0)

	  } // while (inFile.available() != 0)

	  inFile.close ();

	  //
	  // compute the compound interest
	  //
	  for (i = highDate.getYear(); i < Date.currentDate.getYear(); i++)
		  algHigh = algHigh * ANNUAL_INTEREST;

	  return algHigh;

  } // getAlgorithmPrice

} // class ComputeMasterpiecePrice