code: package org.optsol.project_scheduling.mrcpsp.see.constraints.rsee;
  
  import com.google.ortools.linearsolver.MPConstraint;
  import com.google.ortools.linearsolver.MPSolver;
  import com.google.ortools.linearsolver.MPVariable;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.Set;
  import org.optsol.jdecor.core.AbstractVariableManager;
  import org.optsol.jdecor.ortools.AbstractOrtoolsConstraintManager;
  import org.optsol.project_scheduling.mrcpsp.constants.shared.events.IConstants_E;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_A;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_M_i;
  import org.optsol.project_scheduling.mrcpsp.see.variables.DecisionVars_Rsee;
  
  public class RSEE_i_StartBeforeEnd_dis<CONST extends IConstants_A & IConstants_E & IConstants_M_i>
      extends AbstractOrtoolsConstraintManager<CONST> {
  
    public RSEE_i_StartBeforeEnd_dis() {
      super("i", "m", "e");
    }
  
    @Override
    protected Collection<ConstraintKey> createKeys(CONST constants) {
      Set<ConstraintKey> keys = new HashSet<>();
      for (Integer i : constants.get_A()) {
        for (Integer m : constants.get_M_i(i)) {
          for (Integer e : constants.get_E()) {
            if (e != 0) {
              keys.add(new ConstraintKey(i, m, e));
            }
          }
        }
      }
      return keys;
    }
  
    @Override
    protected void configureConstraint(MPConstraint constraint, CONST constants,
        AbstractVariableManager<MPSolver, MPVariable> variables, ConstraintKey index)
        throws Exception {
  
      int i = index.get("i");
      int m = index.get("m");
      int e = index.get("e");
  
      constraint.setUb(0);
  
      constraint.setCoefficient(
          variables.getVar(DecisionVars_Rsee.y_tilde, i, m, e),
          1);
  
      constraint.setCoefficient(
          variables.getVar(DecisionVars_Rsee.x_tilde, i, m, e - 1),
          -1);
    }
  }
  