public PositionTester(String uri, int line, int col)
throws IOException, SAXException, XPathExpressionException {
InputStream is = new FileInputStream(new File(uri));
Document document = PositionalXMLReader.readXML(is);
XPathFactory xFactory = XPathFactory.newInstance();
XPath xpath = xFactory.newXPath();
XPathExpression expr = xpath.compile("//*");
Object result = expr.evaluate(document, XPathConstants.NODESET);
NodeList allNodes = (NodeList) result;
int i = 0;
Node node;
while (allNodes.item(i) != null) {
node = allNodes.item(i);
i++;
int ln = (Integer) node.getUserData("lineNumber");
int cn = (Integer) node.getUserData("columnNumber");
if (line == ln && col == cn) {
element = node;
break;
}
}
}
@JRubyMethod
public IRubyObject root(ThreadContext context) {
Node rootNode = getDocument().getDocumentElement();
try {
Boolean isValid = (Boolean) rootNode.getUserData(NokogiriHelpers.VALID_ROOT_NODE);
if (!isValid) return context.getRuntime().getNil();
} catch (NullPointerException e) {
// does nothing since nil wasn't set to the root node before.
}
if (rootNode == null) return context.getRuntime().getNil();
else return getCachedNodeOrCreate(context.getRuntime(), rootNode);
}
/** 将一个DOM结点封装成XmlNode, 对同一个DOM结点, 当调用此方法时每次 都返回同一个XmlNode实例. */
public static XmlNode valueOf(Node dom) {
if (dom == null) {
return null;
} else {
XmlNode node = (XmlNode) dom.getUserData(XML_NODE_KEY);
if (node == null) {
node = new RealNode(dom);
dom.setUserData(XML_NODE_KEY, node, null);
}
return node;
}
}
private FailureLocation getFailureLocation(List<Document> docs, XNode fNode) {
if (fNode == null) {
return null;
}
XPathUtils xpather = new XPathUtils(fNode.getNSMap());
for (Document doc : docs) {
Node node = (Node) xpather.getValue(fNode.toString(), doc, XPathConstants.NODE);
if (null != node) {
try {
return new FailureLocation((Location) node.getUserData("location"), doc.getDocumentURI());
} catch (Exception ex) {
// ignore, probably not DOM level 3
}
}
}
return null;
}
private static XmlNode getUserData(Node node) {
if (DOM_LEVEL_3) {
return (XmlNode) node.getUserData(USER_DATA_XMLNODE_KEY);
}
return null;
}