private Constraint createAttributeConstraint(AttributeConstraint attributeConstraint) {
Constraint result = null;
Constraint constraint = null;
AttributeOperand leftOperand = attributeConstraint.getLeftOperand();
IntegerVariable leftOperandVariable = getVariableForAttributeOperand(leftOperand);
AttributeOperand rightOperand = attributeConstraint.getRightOperand();
IntegerVariable rightOperandVariable = getVariableForAttributeOperand(rightOperand);
Relop operator = attributeConstraint.getOperator();
switch (operator) {
case EQUAL:
constraint = Choco.eq(leftOperandVariable, rightOperandVariable);
break;
case GREATER_THAN:
constraint = Choco.gt(leftOperandVariable, rightOperandVariable);
break;
case GREATER_THAN_OR_EQUAL:
constraint = Choco.geq(leftOperandVariable, rightOperandVariable);
break;
case LESS_THAN:
constraint = Choco.lt(leftOperandVariable, rightOperandVariable);
break;
case LESS_THAN_OR_EQUAL:
constraint = Choco.leq(leftOperandVariable, rightOperandVariable);
break;
case UNEQUAL:
constraint = Choco.neq(leftOperandVariable, rightOperandVariable);
break;
default:
break;
}
IntegerVariable leftFeatureVariable = getFeatureVariableForOperand(leftOperand);
IntegerVariable rightFeatureVariable = getFeatureVariableForOperand(rightOperand);
// if both are features and both are selected, then the attribute constraint must be evaluated
if (leftFeatureVariable != null && rightFeatureVariable != null) {
Constraint leftFeatureSelected = Choco.eq(leftFeatureVariable, 1);
Constraint rightFeatureSelected = Choco.eq(rightFeatureVariable, 1);
Constraint and = Choco.and(leftFeatureSelected, rightFeatureSelected);
result = Choco.implies(and, constraint);
} else {
// if one of the two operand is a constant,the constraint will be evaluated if the host
// feature is selected
if (leftFeatureVariable != null) {
result = getFeatureAttributeValueConstraint(leftFeatureVariable, constraint);
} else if (rightFeatureVariable != null) {
result = getFeatureAttributeValueConstraint(rightFeatureVariable, constraint);
}
}
return result;
}
private AttributeOperand getOtherOperand(AttributeOperand operand) {
AttributeOperand other = null;
EObject container = operand.eContainer();
if (container instanceof AttributeConstraint) {
AttributeConstraint attConstraint = (AttributeConstraint) container;
AttributeOperand leftOperand = attConstraint.getLeftOperand();
AttributeOperand rightOperand = attConstraint.getRightOperand();
if (EcoreUtil.equals(operand, leftOperand)) {
other = rightOperand;
} else {
other = leftOperand;
}
}
return other;
}