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.stream.Collectors;
  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.see.variables.DecisionVars_Rsee;
  
  public class RSEE_c_EventTimeOrder<CONST extends IConstants_A & IConstants_E>
      extends AbstractOrtoolsConstraintManager<CONST> {
  
    public RSEE_c_EventTimeOrder() {
      super("e");
    }
  
    @Override
    protected Collection<ConstraintKey> createKeys(CONST constants) {
      return
          constants.get_E().stream()
              .filter(e -> e != constants.get_card_A())
              .map(ConstraintKey::new)
              .collect(Collectors.toSet());
    }
  
    @Override
    protected void configureConstraint(
        MPConstraint constraint,
        CONST constants,
        AbstractVariableManager<MPSolver, MPVariable> variables,
        ConstraintKey index)
        throws Exception {
  
      int e = index.get("e");
  
      constraint.setUb(0);
      constraint.setCoefficient(variables.getVar(DecisionVars_Rsee.s, e), 1);
      constraint.setCoefficient(variables.getVar(DecisionVars_Rsee.s, e + 1), -1);
    }
  
  }
  