protected void removeElement(Element element) { if (element == null) { throw new IllegalArgumentException("An element must be specified."); } if (!canBeRemoved(element)) { throw new IllegalArgumentException("The element named '" + element.getName() + "' cannot be removed from this view."); } ElementView elementView = new ElementView(element); elementViews.remove(elementView); for (RelationshipView relationshipView : getRelationships()) { if (relationshipView.getRelationship().getSource().equals(element) || relationshipView.getRelationship().getDestination().equals(element)) { remove(relationshipView.getRelationship()); } } }