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();
}
