MsgHandler.java

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import java.io.IOException;
import java.io.FileWriter;
import conopt.*;
 
public class MsgHandler extends MessageHandler {
   FileWriter fs;
   FileWriter fd;
 
   public MsgHandler(String name) {
      try {
         fs = new FileWriter(name + ".sta");
         fd = new FileWriter(name + ".lst");
      }
      catch (Exception e) {
         e.getStackTrace();
      }
   }
 
   public void close() {
      try {
         fs.close();
         fd.close();
      }
      catch (Exception e) {
         e.getStackTrace();
      }
   }

   public int message(int smsg, int dmsg, int nmsg, String[] msgv) {
      try {
         for (int i = 0; i < smsg; i++)
         {
            System.out.println(msgv[i]);
            fs.write(msgv[i] + System.lineSeparator());
         }
 
         for (int i = 0; i < dmsg; i++)
         {
            fd.write(msgv[i] + System.lineSeparator());
         }
      }
      catch (Exception e) {
         e.getStackTrace();
      }
 
      return 0;
   }

   public int errorMessage(int rowno, int colno, int posno, String msg) {
      String errormsg = "";
      if (rowno == -1)
         errormsg += "Variable " + colno + " : ";
      else if (colno == -1)
         errormsg += "Equation " + rowno + " : ";
      else
         errormsg += "Variable " + colno + " appearing in Equation " + rowno + " : ";
 
      try {
         fs.write(errormsg + System.lineSeparator());
         fd.write(errormsg + System.lineSeparator());
      }
      catch (Exception e) {
         e.getStackTrace();
      }
 
      return 0;
   }
}