private void removeDeselectedDomainValues(Attribute attribute, Set<Integer> values) {
EList<String> deselectedDomainValues = attribute.getDeselectedDomainValues();
Domain domain = attribute.getDomain();
for (String valueString : deselectedDomainValues) {
int deselectedValue = FeatureModelHelper.getDomainValueForString(valueString, domain);
Integer deselected = Integer.valueOf(deselectedValue);
values.remove(deselected);
}
}
private IntegerVariable getOrCreateVariable(Attribute attribute) {
String attributeName = attribute.getName();
String featureId = attribute.getFeature().getId();
String identifier = attributeValue;
String[] parts = new String[] {identifier, featureId, attributeName};
String attributeId = concatenate(parts, attributeDelimiter);
IntegerVariable integerVariable = nodeVariables.get(attributeId);
if (integerVariable == null) {
integerVariable = createAttributeValueVariable(attribute, attributeId);
nodeVariables.put(attributeId, integerVariable);
}
return integerVariable;
}
private Constraint getMemberConstraint(Attribute attribute) {
Constraint memberConstraint = null;
IntegerVariable attributeValueVariable = getOrCreateVariable(attribute);
// if attribute value is set, then the according attribute value must be
// set
if (FeatureModelHelper.isAttributeValueSet(attribute)) {
int value = FeatureModelHelper.getAttributeValue(attribute);
memberConstraint = Choco.eq(value, attributeValueVariable);
} else {
// check domain values
Domain domain = attribute.getDomain();
if (domain instanceof NumericalDomain) {
NumericalDomain numericalDomain = (NumericalDomain) domain;
// value of attribute must be in one of the intervals.
int[] values = getNumericalValues(numericalDomain, attribute);
memberConstraint = Choco.member(attributeValueVariable, values);
} else if (domain instanceof DiscreteDomain) {
DiscreteDomain discreteDomain = (DiscreteDomain) domain;
int[] domainValues = discreteDomainValues.get(discreteDomain.getId());
memberConstraint = Choco.member(attributeValueVariable, domainValues);
}
}
return memberConstraint;
}
private void transformAttribute(Attribute attribute) {
// 0: attribute is disabled if feature is disabled
// 1: attribute is enabled if feature is selected
IntegerVariable featureVariable = getOrCreateVariable(attribute.getFeature());
Constraint memberConstraint = getMemberConstraint(attribute);
// if feature is enabled, then attribute value must be in bounds
Constraint featureEnabled = Choco.eq(featureVariable, 1);
Constraint checkAttribute = Choco.implies(featureEnabled, memberConstraint);
getModel().addConstraint(checkAttribute);
IntegerVariable attributeVariable = getOrCreateVariable(attribute);
Constraint featureDisabled = Choco.eq(featureVariable, 0);
Constraint attrDisabled = Choco.eq(attributeVariable, attributeDisabled);
Constraint disabledAttr = Choco.ifOnlyIf(featureDisabled, attrDisabled);
getModel().addConstraint(disabledAttr);
}
private IntegerVariable createAttributeValueVariable(Attribute attribute, String attributeId) {
// String attrOptions = "cp:no_decision";
String attrOptions = "";
IntegerVariable attributeVariable = null;
// (1) if attribute value is set, then attribute can either be this value or the disabled
// attribute value
if (FeatureModelHelper.isAttributeValueSet(attribute)) {
int value = FeatureModelHelper.getAttributeValue(attribute);
int[] attributeValues = new int[] {value, attributeDisabled};
attributeVariable = Choco.makeIntVar(attributeId, attributeValues, attrOptions);
} else {
Domain attributeDomain = attribute.getDomain();
// (2) if attribute domain is discrete
if (attributeDomain instanceof DiscreteDomain) {
DiscreteDomain discreteDomain = (DiscreteDomain) attributeDomain;
int[] domainValues = getDomainValues(attribute, discreteDomain);
attributeVariable = Choco.makeIntVar(attributeId, domainValues, attrOptions);
// todo: check numerical domain and use intervals instead
// (3) if attribute domain is integer
} else if (attributeDomain instanceof NumericalDomain) {
NumericalDomain numericalDomain = (NumericalDomain) attributeDomain;
int lowestBoundofNumericalDomain = getLowestBoundofNumericalDomain(numericalDomain);
int highestBoundofNumericalDomain = getHighestBoundofNumericalDomain(numericalDomain);
if (lowestBoundofNumericalDomain > attributeDisabled) {
lowestBoundofNumericalDomain = attributeDisabled;
}
attributeVariable =
Choco.makeIntVar(
attributeId,
lowestBoundofNumericalDomain,
highestBoundofNumericalDomain,
attrOptions);
}
}
return attributeVariable;
}
