/**
* Create a new anchor for the given node, specifying which relations it must or can have.
* Relations whose maximum cardinality constraint is already fullfilled are not added to the menu.
*
* @param r OntologyReader to extract information from ontology
* @param c OntClass corresponding to this anchor
* @param n SGNode for which this anchor is created
* @param query true if this is an anchor for a node in the QueryGraph
* @param userID UserID
* @throws BadAnchorException if the given SGNode does not need an anchor
*/
public Anchor(OntologyReader r, OntClass c, SGNode n, boolean query, String userID)
throws BadAnchorException {
node = n;
this.query = query;
if (node.getAnchor() != null) id = node.getAnchor().getID();
else id = UUID.randomUUID().toString();
reader = r;
if (n instanceof SGDateNode) throw new BadAnchorException("A date does not need an anchor");
node.setAnchor(this); // tell the node it has an anchor
setURI(userID);
if (addShowOrHideOption() == SGNode.NEW)
init(c, query); // only make extensive anchors for newly created nodes
}
