New methods in Outcome to support XPath queries to make extraction of

XML data in scripts easier. Fixes #167

1 files changed, 23 insertions, 1 deletions

diff --git a/src/main/java/com/c2kernel/persistency/outcome/Outcome.java b/src/main/java/com/c2kernel/persistency/outcome/Outcome.java
index b2f706b..f25922c 100644
--- a/src/main/java/com/c2kernel/persistency/outcome/Outcome.java
+++ b/src/main/java/com/c2kernel/persistency/outcome/Outcome.java
@@ -5,6 +5,11 @@ import java.util.StringTokenizer;
 import javax.xml.parsers.DocumentBuilder;

 import javax.xml.parsers.DocumentBuilderFactory;

 import javax.xml.parsers.ParserConfigurationException;

+import javax.xml.xpath.XPath;

+import javax.xml.xpath.XPathConstants;

+import javax.xml.xpath.XPathExpression;

+import javax.xml.xpath.XPathExpressionException;

+import javax.xml.xpath.XPathFactory;

 

 import org.w3c.dom.Document;

 import org.w3c.dom.NodeList;

@@ -29,6 +34,7 @@ public class Outcome implements C2KLocalObject {
     Document dom;

     static DocumentBuilder parser;

     static DOMImplementationLS impl;

+    static XPath xpath;

 

     static {

     	// Set up parser

@@ -50,7 +56,9 @@ public class Outcome implements C2KLocalObject {
             Logger.error(e);

             Logger.die("Cannot function without XML serialiser");

 		}

-

+        

+        XPathFactory xPathFactory = XPathFactory.newInstance();

+        xpath = xPathFactory.newXPath();

     }

 

     //id is the eventID

@@ -169,6 +177,20 @@ public class Outcome implements C2KLocalObject {
     	 else

     		 return null;

     }

+    

+    public String getFieldByXPath(String xpathExpr) throws XPathExpressionException {

+    	

+    	XPathExpression expr = xpath.compile(xpathExpr);

+    	return (String)expr.evaluate(getDOM(), XPathConstants.STRING);

+    	

+    }

+    

+    public NodeList getNodesByXPath(String xpathExpr) throws XPathExpressionException {

+    	

+    	XPathExpression expr = xpath.compile(xpathExpr);

+    	return (NodeList)expr.evaluate(getDOM(), XPathConstants.NODESET);

+    	

+    }

 

     static public String serialize(Document doc, boolean prettyPrint)

     {