Examples with IConstraint org.eclipse.xtext.serializer.analysis.IGrammarConstraintProvider.IConstraint used on opensource projects

Example 16 with IConstraint

use of org.eclipse.xtext.serializer.analysis.IGrammarConstraintProvider.IConstraint in project xtext-core by eclipse.

the class PartialSerializer method trySerializeMultiValue.

protected List<SerializationStrategy> trySerializeMultiValue(EObject owner, FeatureChange change, IEObjectRegion ownerRegion, IConstraint constraint) {
    EStructuralFeature feature = change.getFeature();
    List<SerializationStrategy> result = Lists.newArrayList();
    IFeatureInfo featureInfo = constraint.getFeatures()[owner.eClass().getFeatureID(feature)];
    List<IConstraintElement> assignments = featureInfo.getAssignments();
    if (assignments.size() != 1) {
        return null;
    }
    IConstraintElement assignment = assignments.get(0);
    if (!assignment.isMany()) {
        return null;
    }
    List<IAstRegion> originals = findRegions(ownerRegion, change);
    EList<ListChange> listChanges = change.getListChanges();
    if (listChanges.isEmpty() && originals.isEmpty()) {
        ISerializationContext ctx = getSerializationContext(owner);
        AbstractElement ins = assignment.getGrammarElement();
        IHiddenRegion insertAt = insertionPointFinder.findInsertionPoint(ctx, ownerRegion, ins);
        if (insertAt == null) {
            return null;
        }
        for (Object value : (List<?>) owner.eGet(feature)) {
            EObject obj = (EObject) value;
            ISerializationContext context = getSerializationContext(obj);
            result.add(new SerializeRecursiveStrategy(insertAt, obj, context));
        }
        return result;
    }
    // ListTransient listTransient = transientValues.isListTransient(owner, feature);
    List<Object> modifying = Lists.newArrayList(((List<?>) owner.eGet(feature)));
    for (ListChange lc : listChanges) {
        ChangeKind kind = lc.getKind();
        if (kind == ADD_LITERAL) {
            IAstRegion region = originals.get(lc.getIndex());
            result.add(new DeleteRegionStrategy(region));
        } else if (kind == MOVE_LITERAL || kind == REMOVE_LITERAL) {
            if (originals.isEmpty()) {
                return null;
            }
            int index = lc.getIndex();
            IHiddenRegion insertAt;
            if (index >= originals.size()) {
                insertAt = ((ISequentialRegion) originals.get(originals.size() - 1)).getNextHiddenRegion();
            } else {
                insertAt = ((ISequentialRegion) originals.get(index)).getPreviousHiddenRegion();
            }
            if (insertAt == null) {
                return null;
            }
            EObject value = (EObject) modifying.get(index);
            modifying.remove(index);
            if (kind == REMOVE_LITERAL) {
                ISerializationContext context = getSerializationContext(value);
                result.add(new SerializeRecursiveStrategy(insertAt, value, context));
            } else if (kind == ChangeKind.MOVE_LITERAL) {
                int moveToIndex = lc.getMoveToIndex();
                IAstRegion source = originals.get(moveToIndex);
                result.add(new DeleteRegionStrategy(source));
                result.add(new InsertRegionStrategy(insertAt, source));
            }
        }
    }
    return result;
}