private void createGroupConstraint(Group group) {
// group with cardinality {n,m} represented as
// ifThen(ParentFeature>0;sum(ChildFeature A, ChildFeature
// B) in {n,m};)
// if group cardinality is n=m, then
// ifThen(ParentFeature>0;sum(ChildFeature A, ChildFeature B) = n)
log.debug("Create constraint for group " + group);
IntegerVariable parentFeatureVariable = getOrCreateVariable((Feature) group.eContainer());
IntegerExpressionVariable childFeatureSum = createChildFeatureVariable(group);
int minCardinality = getMinChocoCardinality(group);
int maxCardinality = getMaxChocoCardinality(group);
Constraint ifConstraint = Choco.gt(parentFeatureVariable, 0);
Constraint greaterThan = Choco.geq(childFeatureSum, minCardinality);
Constraint smallerThan = Choco.leq(childFeatureSum, maxCardinality);
Constraint thenConstraint = Choco.and(greaterThan, smallerThan);
Constraint groupCardinalityConstraint = Choco.implies(ifConstraint, thenConstraint);
getModel().addConstraint(groupCardinalityConstraint);
}
private void createFeatureConstraint(Feature feature) {
IntegerVariable childVariable = getOrCreateVariable(feature);
int minCardinality = 0;
int maxCardinality = 1;
Constraint greaterThan = Choco.geq(childVariable, minCardinality);
Constraint smallerThan = Choco.leq(childVariable, maxCardinality);
Constraint thenConstraint = Choco.and(greaterThan, smallerThan);
EObject featureContainer = feature.eContainer();
if (featureContainer instanceof Group) {
Group parentGroup = (Group) featureContainer;
EObject groupContainer = parentGroup.eContainer();
if (groupContainer instanceof Feature) {
Feature parentFeature = (Feature) groupContainer;
IntegerVariable parentVariable = getOrCreateVariable(parentFeature);
// feature value must be in feature cardinality boundaries
Constraint parentSelected = Choco.gt(parentVariable, 0);
Constraint parentSelectedAndChildCardinality =
Choco.implies(parentSelected, thenConstraint);
getModel().addConstraint(parentSelectedAndChildCardinality);
Constraint childSelected = Choco.gt(childVariable, 0);
Constraint impliesConstraint = Choco.implies(childSelected, parentSelected);
getModel().addConstraint(impliesConstraint);
}
} else {
// handle rootgroup
Constraint greater = Choco.gt(childVariable, minCardinality);
getModel().addConstraint(greater);
}
}