ExpressionContext

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org.apache.commons.jxpath
Interface ExpressionContext

public interface ExpressionContext

If an extenstion function has an argument of type ExpressionContext, it can gain access to the current node of an XPath expression context.

Example:

 public class MyExtenstionFunctions {
    public static String objectType(ExpressionContext context){
       Object value = context.getContextNodePointer().getValue();
       if (value == null){
           return "null";
       }
       return value.getClass().getName();
    }
 }

You can then register this extension function using a ClassFunctions object and call it like this:

   "/descendent-or-self::node()[ns:objectType() = 'java.util.Date']"

This expression will find all nodes of the graph that are dates.

Method Summary

java.util.List getContextNodeList()
          Get the current context node list.

Pointer getContextNodePointer()
          Get the current context node.

JXPathContext getJXPathContext()
          Get the JXPathContext in which this function is being evaluated.

int getPosition()
          Returns the current context position.

Method Detail

getJXPathContext

public JXPathContext getJXPathContext()

Get the JXPathContext in which this function is being evaluated.

getContextNodePointer

public Pointer getContextNodePointer()

Get the current context node.

getContextNodeList

public java.util.List getContextNodeList()

Get the current context node list. Each element of the list is a Pointer.

getPosition

public int getPosition()

Returns the current context position.