package yalp.libs;
import java.util.List;
import java.util.Map;
import org.jaxen.dom.DOMXPath;
import org.w3c.dom.Node;
import org.w3c.dom.Text;
/**
* XPath for parsing
*/
public class XPath {
/**
* Select all nodes that are selected by this XPath expression. If multiple nodes match,
* multiple nodes will be returned. Nodes will be returned in document-order,
*
* @param path
* @param node
* @param namespaces Namespaces that need to be available in the xpath, where the key is the
* prefix and the value the namespace URI
* @return
*/
@SuppressWarnings("unchecked")
public static List<Node> selectNodes(String path, Object node, Map<String, String> namespaces) {
try {
return getDOMXPath(path, namespaces).selectNodes(node);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Select all nodes that are selected by this XPath expression. If multiple nodes match,
* multiple nodes will be returned. Nodes will be returned in document-order,
*
* @param path
* @param node
* @return
*/
public static List<Node> selectNodes(String path, Object node) {
return selectNodes(path, node, null);
}
public static Node selectNode(String path, Object node, Map<String, String> namespaces) {
try {
List<Node> nodes = selectNodes(path, node, namespaces);
if (nodes.size() == 0) {
return null;
}
return nodes.get(0);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static Node selectNode(String path, Object node) {
return selectNode(path, node, null);
}
/**
* Return the text of a node, or the value of an attribute
*
* @param path the XPath to execute
* @param node the node, node-set or Context object for evaluation. This value can be null.
*/
public static String selectText(String path, Object node, Map<String, String> namespaces) {
try {
Node rnode = (Node) getDOMXPath(path, namespaces).selectSingleNode(node);
if (rnode == null) {
return null;
}
if (!(rnode instanceof Text)) {
rnode = rnode.getFirstChild();
}
if (!(rnode instanceof Text)) {
return null;
}
return ((Text) rnode).getData();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Return the text of a node, or the value of an attribute
*
* @param path the XPath to execute
* @param node the node, node-set or Context object for evaluation. This value can be null.
*/
public static String selectText(String path, Object node) {
return selectText(path, node, null);
}
private static DOMXPath getDOMXPath(String path, Map<String, String> namespaces) throws Exception {
DOMXPath xpath = new DOMXPath(path);
if (namespaces != null) {
for (String prefix : namespaces.keySet()) {
xpath.addNamespace(prefix, namespaces.get(prefix));
}
}
return xpath;
}
}