/********************************************************
  Xpress Optimizer Example Problems
  =================================

  file foliomatsolpool.java
  `````````````````````````
  Using the MIP solution pool with a MIP problem
  input from a matrix file.

  (c) 2009 Fair Isaac Corporation
      author: D.Nielsen, S.Heipcke, July 2009, rev. June 2010
********************************************************/

import com.dashoptimization.*;

class foliomatsolpool
{
 public static void main(String args[])
 {
  try {
    XPRS.init ();
  } catch (Exception e) {
    System.out.println("Failed to initialize");
    return;
  }

  try {
   int s, nSols, nCols;
   DoubleHolder objval = new DoubleHolder();
   double[] sol = new double[1];
   IntHolder solID = new IntHolder();
   IntHolder solStatus = new IntHolder();

   XPRSprob prob = new XPRSprob();
   XPRSmipsolpool msp = new XPRSmipsolpool();

   /* Read in the matrix file */
   prob.readProb("folio10_7.lp", "");

   /* Attach the mip solution pool to the problem so it will 
      automatically receive the solutions as they are found */
   msp.probAttach(prob);

   /* Solve the problem */
   prob.chgObjSense(XPRSenumerations.ObjSense.MAXIMIZE); 
   prob.mipOptimize();

   /* Get the number of solutions found */
   nSols = msp.getIntAttrib(XPRS.MSP_SOLUTIONS);

   if(nSols > 0)
   {
    System.out.println("Number of solutions: " + nSols);

    /* Get the best objective value of the solutions found */
    msp.getDblAttribProbExtreme(prob, 1, solID, XPRS.MSP_SOLPRB_OBJ, objval);

    System.out.println("Optimal solution ID: " + solID.value);
    System.out.println("Optimal objective  : " + objval.value);

    /* Get the number of columns in the solutions */
    nCols = msp.getIntAttribSol(solID.value, solStatus, XPRS.MSP_SOL_COLS);

    /* Print out the solution values of the best solution */
    for(s=0; s<nCols ;s++) {
     msp.getSol(solID.value, solStatus, sol, s, s, null);
     if(sol[0]!=0) System.out.println((s+1) + ": "+ sol[0]);
    }
   }
  } catch(XPRSprobException xpe) {
   xpe.printStackTrace();
  }

  XPRS.free();
 }
}