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); } }
/** * Given an expression and a context, evaluate the XPath and return the result. * * @param xctxt The execution context. * @param contextNode The node that "." expresses. * @param namespaceContext The context in which namespaces in the XPath are supposed to be * expanded. * @return The result of the XPath or null if callbacks are used. * @throws TransformerException thrown if the error condition is severe enough to halt processing. * @throws javax.xml.transform.TransformerException * @xsl.usage experimental */ public XObject execute( XPathContext xctxt, org.w3c.dom.Node contextNode, PrefixResolver namespaceContext) throws javax.xml.transform.TransformerException { return execute(xctxt, xctxt.getDTMHandleFromNode(contextNode), namespaceContext); }