code: package org.optsol.project_scheduling.mrcpsp.fct.constraints;
  
  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.sub.IConstants_E_i;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_L_i;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_V;
  import org.optsol.project_scheduling.mrcpsp.fct.variables.DecisionVars_Fct;
  
  public class FCT_TW_StartingTimeBounds<CONST
      extends IConstants_V & IConstants_E_i & IConstants_L_i>
      extends AbstractOrtoolsConstraintManager<CONST> {
  
    public FCT_TW_StartingTimeBounds() {
      super("i");
    }
  
    @Override
    protected Collection<ConstraintKey> createKeys(CONST constants) {
      return
          constants.get_V()
              .stream()
              .map(ConstraintKey::new)
              .collect(Collectors.toSet());
    }
  
    @Override
    protected void configureConstraint(
        MPConstraint constraint,
        CONST constants,
        AbstractVariableManager<MPSolver, MPVariable> variables,
        ConstraintKey index) throws Exception {
  
      int i = index.get("i");
      MPVariable var = variables.getVar(DecisionVars_Fct.s, i);
      var.setLb(constants.get_E_i(i));
      var.setUb(constants.get_L_i(i));
    }
  }