code: package org.optsol.project_scheduling.mrcpsp.ooe.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.HashSet;
  import org.optsol.jdecor.core.AbstractConstraintManager;
  import org.optsol.jdecor.core.AbstractVariableManager;
  import org.optsol.jdecor.ortools.AbstractOrtoolsConstraintManager;
  import org.optsol.project_scheduling.mrcpsp.constants.shared.events.IConstants_E_squared;
  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.constants.sub.IConstants_p_im;
  import org.optsol.project_scheduling.mrcpsp.ooe.variables.DecisionVars_Ooe;
  import org.optsol.project_scheduling.utils.ImmutableIntPair;
  
  public class OOE_d_EventTimeDefinition<CONST
      extends IConstants_E_squared & IConstants_A & IConstants_M_i & IConstants_p_im>
      extends AbstractOrtoolsConstraintManager<CONST> {
  
    public OOE_d_EventTimeDefinition() {
      super("i", "m", "e", "f");
    }
  
    @Override
    protected Collection<ConstraintKey> createKeys(CONST constants) {
      //generate all indexes of constraint group:
      HashSet<ConstraintKey> indexes = new HashSet<>();
      for (int i : constants.get_A()) {
        for (int m : constants.get_M_i(i)) {
          for (ImmutableIntPair pair : constants.get_E_squared()) {
            indexes.add(new ConstraintKey(i, m, pair.getFirst(), pair.getSecond()));
          }
        }
      }
      return indexes;
    }
  
    @Override
    protected void configureConstraint(
        MPConstraint constraint,
        CONST constants,
        AbstractVariableManager<MPSolver, MPVariable> variables,
        AbstractConstraintManager<MPSolver, CONST, MPVariable, MPConstraint>.ConstraintKey constraintKey)
        throws Exception {
  
      int i = constraintKey.get("i");
      int m = constraintKey.get("m");
      int e = constraintKey.get("e");
      int f = constraintKey.get("f");
  
      constraint.setLb(-constants.get_p_im(i, m));
  
      constraint.setCoefficient(
          variables.getVar(DecisionVars_Ooe.s, f),
          1.);
  
      if (f != constants.get_card_A()) {
        constraint.setCoefficient(
            variables.getVar(DecisionVars_Ooe.z, i, m, f),
            constants.get_p_im(i, m));
      }
  
      if (f == e + 1) {
  
        // in this case: e = f-1
        double coeff = 2. * -constants.get_p_im(i, m);
        constraint.setCoefficient(
            variables.getVar(DecisionVars_Ooe.z, i, m, e),
            coeff);
  
      } else {
  
        constraint.setCoefficient(
            variables.getVar(DecisionVars_Ooe.z, i, m, f - 1),
            -constants.get_p_im(i, m));
  
        constraint.setCoefficient(
            variables.getVar(DecisionVars_Ooe.z, i, m, e),
            -constants.get_p_im(i, m));
      }
  
      constraint.setCoefficient(
          variables.getVar(DecisionVars_Ooe.s, e),
          -1.);
  
      if (e != 0) {
        constraint.setCoefficient(
            variables.getVar(DecisionVars_Ooe.z, i, m, e - 1),
            constants.get_p_im(i, m));
      }
    }
  }
  