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  1. import java.io.ByteArrayInputStream;
  2. import javax.xml.parsers.*;
  3. import org.w3c.dom.Document;
  4. import org.w3c.dom.Element;
  5. import org.w3c.dom.Node;
  6. import javax.xml.xpath.*;
  7. import java.io.*;
  8. import org.xml.sax.*;
  9.  
  10. public class Main{
  11.  
  12. public static void main(String[] args) {
  13.     try 
  14.     {
  15.         String xmlStr ="<foo><foo1>Foo Test 1</foo1><foo2>hello</foo2><foo2/><foo2><another1 /><another1><test1>Foo Test 2</test1></another1></foo2><foo3>Foo Test 3</foo3><foo4>Foo Test 4</foo4></foo>";
  16.  
  17.       Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(
  18.         new ByteArrayInputStream(xmlStr.getBytes())
  19.       );
  20.  
  21.       String xpath = findXPathInXMLString(89, xmlStr);
  22.       System.out.println(xpath);        
  23.  
  24.     }
  25.     catch (Exception e) 
  26.     {
  27.       e.printStackTrace();
  28.     }    
  29. }
  30.  
  31. public static String findXPathInXMLString(int index, String string) throws XPathExpressionException, SAXException, ParserConfigurationException, IOException {
  32.     String xpath;
  33.  
  34.     //Step 1. Insert temporary tag in insert location
  35.     StringBuilder stringBuilder = new StringBuilder(string);
  36.     stringBuilder.insert(index, "<findXPathInXMLStringTemporaryTag />");
  37.  
  38.     Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(
  39.         new ByteArrayInputStream(stringBuilder.toString().getBytes())
  40.       );
  41.  
  42.     //Step 2. Convert string document to DOM document & Find XPath of temporary tag in DOM document
  43.     xpath = getXPath(document, "findXPathInXMLStringTemporaryTag");
  44.  
  45.     //Step 3. Cut off last part of the XPath
  46.     xpath = xpath.replace("/findXPathInXMLStringTemporaryTag", "");
  47.  
  48.     //Step 4. Return the XPath
  49.     return xpath;
  50. }
  51.  
  52. private static String getXPath(Document root, String elementName) throws XPathExpressionException 
  53. {
  54.   XPathExpression expr = XPathFactory.newInstance().newXPath().compile("//"+elementName);
  55.   Node node = (Node)expr.evaluate(root, XPathConstants.NODE);
  56.  
  57.  
  58.   if(node != null) {
  59.       return getXPath(node);
  60.   }
  61.  
  62.   return null;
  63. }
  64.  
  65. private static String getXPath(Node node) throws XPathExpressionException {
  66.     if(node == null || node.getNodeType() != Node.ELEMENT_NODE) {
  67.         return "";
  68.     }
  69.  
  70.     return getXPath(node.getParentNode()) + "/" + node.getNodeName() + getIndex(node);
  71. }
  72.  
  73. private static String getIndex(Node node) throws XPathExpressionException {
  74.     XPathExpression expr = XPathFactory.newInstance().newXPath().compile("count(preceding-sibling::*[local-name() = '" + node.getNodeName() + "'])");
  75.     int result = (int)(double)(Double)expr.evaluate(node, XPathConstants.NUMBER);
  76.  
  77.     if(result == 0){
  78.         return "";
  79.     }
  80.     else {
  81.         return "[" + (result + 1) + "]";
  82.     }
  83. }
  84.  
  85. }
Success #stdin #stdout 0.1s 246144KB
comments (?)
stdin 
Standard input is empty
stdout 
/foo/foo2[3]/another1[2]/test1
https://ideone.com/fW1LFX
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
secret

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