private static XMLReader getParser(TPENode root, ResultsCollector r) throws SAXException {
if (!root.isRootNode()) {
throw new RuntimeException("Provided root node is not a root node!");
}
XMLReader parser = XMLReaderFactory.createXMLReader();
ContentHandler contentHandler = new StackEval(root, r);
parser.setContentHandler(contentHandler);
return parser;
}
/**
* Creates a holder for all results: for each in the solution space, we create a placeholder,
* which can be filled in later by other queryes.
*
* <p>precondition: results.size > 0
*
* @return
*/
protected static HashMap<TPENode, Match> buildEmptyResultMatch(TPENode rootnode) {
ArrayList<TPENode> nodes = TPENode.getDescendents(rootnode);
// build the tree of nodes and set their default values with null,
// the real values will be set later if possible.
HashMap<TPENode, Match> resultsmap = new HashMap<TPENode, Match>();
for (TPENode node : nodes) {
if (node.resultvalue == true) {
resultsmap.put(node, null);
}
}
return resultsmap;
}