code: package org.optsol.project_scheduling.mrcpsp.fct.constraints.weak;
  
  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.sub.IConstants_M_i;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_V;
  import org.optsol.project_scheduling.mrcpsp.constants.sub.IConstants_p_im;
  import org.optsol.project_scheduling.mrcpsp.fct.constants.sub.IConstants_Ws_ij;
  import org.optsol.project_scheduling.mrcpsp.fct.variables.DecisionVars_Fct;
  
  public class FCT_cPrime_StartingTimesDef_Weak<CONST
      extends IConstants_V & IConstants_M_i & IConstants_p_im & IConstants_Ws_ij>
      extends AbstractOrtoolsConstraintManager<CONST> {
  
    public FCT_cPrime_StartingTimesDef_Weak() {
      super("i", "j");
    }
  
    @Override
    protected Collection<ConstraintKey> createKeys(CONST constants) {
      Set<ConstraintKey> indexes = new HashSet<>();
      for (int i : constants.get_V()) {
        for (int j : constants.get_V()) {
          if (i != j) {
            indexes.add(new ConstraintKey(i, j));
          }
        }
      }
      return indexes;
    }
  
    @Override
    protected void configureConstraint(
        MPConstraint constraint,
        CONST constants,
        AbstractVariableManager<MPSolver, MPVariable> variables,
        ConstraintKey index)
        throws Exception {
  
      int i = index.get("i");
      int j = index.get("j");
  
      constraint.setUb(constants.get_Ws_ij(i, j));
  
      constraint.setCoefficient(variables.getVar(DecisionVars_Fct.s, i), 1.);
  
      for (int m : constants.get_M_i(i)) {
        constraint.setCoefficient(variables.getVar(DecisionVars_Fct.x, i, m),
            constants.get_p_im(i, m));
      }
  
      constraint.setCoefficient(variables.getVar(DecisionVars_Fct.s, j), -1.);
      constraint.setCoefficient(
          variables.getVar(DecisionVars_Fct.y, i, j),
          constants.get_Ws_ij(i, j));
  
    }
  }
  