public synchronized TemplateModel executeQuery(Object context, String xpathQuery) throws TemplateModelException { if (!(context instanceof Node)) { if (context != null) { if (isNodeList(context)) { int cnt = ((List) context).size(); if (cnt != 0) { throw new TemplateModelException( "Cannot perform an XPath query against a node set of " + cnt + " nodes. Expecting a single node." + ERRMSG_RECOMMEND_JAXEN); } else { throw new TemplateModelException(ERRMSG_EMPTY_NODE_SET); } } else { throw new TemplateModelException( "Cannot perform an XPath query against a " + context.getClass().getName() + ". Expecting a single org.w3c.dom.Node."); } } else { throw new TemplateModelException(ERRMSG_EMPTY_NODE_SET); } } Node node = (Node) context; try { XPath xpath = new XPath(xpathQuery, null, customPrefixResolver, XPath.SELECT, null); int ctxtNode = xpathContext.getDTMHandleFromNode(node); XObject xresult = xpath.execute(xpathContext, ctxtNode, customPrefixResolver); if (xresult instanceof XNodeSet) { NodeListModel result = new NodeListModel(node); result.xpathSupport = this; NodeIterator nodeIterator = xresult.nodeset(); Node n; do { n = nodeIterator.nextNode(); if (n != null) { result.add(n); } } while (n != null); return result.size() == 1 ? result.get(0) : result; } if (xresult instanceof XBoolean) { return ((XBoolean) xresult).bool() ? TemplateBooleanModel.TRUE : TemplateBooleanModel.FALSE; } if (xresult instanceof XNull) { return null; } if (xresult instanceof XString) { return new SimpleScalar(xresult.toString()); } if (xresult instanceof XNumber) { return new SimpleNumber(new Double(((XNumber) xresult).num())); } throw new TemplateModelException("Cannot deal with type: " + xresult.getClass().getName()); } catch (TransformerException te) { throw new TemplateModelException(te); } }
/** * Use an XPath string to select a nodelist. XPath namespace prefixes are resolved from the * namespaceNode. * * @param contextNode The node to start searching from. * @param xpathnode * @param namespaceNode The node from which prefixes in the XPath will be resolved to namespaces. * @return A NodeIterator, should never be null. * @throws TransformerException */ public static NodeIterator selectNodeIterator( Node contextNode, Node xpathnode, Node namespaceNode) throws TransformerException { // Execute the XPath, and have it return the result XObject list = eval(contextNode, xpathnode, namespaceNode); // Have the XObject return its result as a NodeSetDTM. return list.nodeset(); }