/********************************************************
  Xpress-BCL Java Example Problems
  ================================

  file xbworks.java
  `````````````````
  Workshop planning example.

  (c) 2008-2023 Fair Isaac Corporation
      author: S.Heipcke, Jan. 2000, rev. Mar. 2011
********************************************************/

import com.dashoptimization.*;

public class xbworks {
    static final int NProd = 2;     /* Number of products */
    static final int NShop = 3;     /* Number of workshops */
    static final int WMAX = 40;     /* Maximum weekly working time */

    /****DATA****/
    static final int[][] DUR = {{5, 9, 7},
                                {10, 2, 5}};  /* Duration of product p on shop s */
    static final int[] RES   = {10, 8};      /* Man hours per unit */
    static final int[] PRICE = {108, 84};    /* Selling price per unit */

    /***********************************************************************/

    public static void main(String[] args) {
        int p,s;
        XPRBexpr l;
        XPRBvar[] x;                   /* Amount of product p */

        try (XPRBprob pb = new XPRBprob("Workshop")) { /* Initialize BCL and create a new problem */

            /****VARIABLES****/
            x = new XPRBvar[NProd];
            for(p=0;p<NProd;p++)  x[p] = pb.newVar("x");

            /****OBJECTIVE****/
            l = new XPRBexpr();
            for(p=0;p<NProd;p++)
                l.add(x[p].mul(PRICE[p]-5*RES[p]));
            pb.setObj(l);                  /* Set obj. function: maximize benefit */

            /****CONSTRAINTS****/
            for(s=0;s<NShop;s++) {            /* Limit on weekly working hours */
                l = new XPRBexpr();
                for(p=0;p<NProd;p++)  l.add(x[p].mul(DUR[p][s]));
                pb.newCtr("ResMax", l.lEql(WMAX) );
            }

            /****SOLVING + OUTPUT****/
            pb.setSense(XPRB.MAXIM);
            pb.lpOptimize("");             /* Solve the LP-problem */
            System.out.println("Objective: " + pb.getObjVal());  /* Get objective value */
            for(p=0;p<NProd;p++)           /* Print the solution values */
                System.out.print(x[p].getName() + ":" + x[p].getSol() + " ");
            System.out.println();
        }
    }
}