Package org.apache.commons.jxpath

Interface ExpressionContext

All Known Implementing Classes:
AncestorContext, AttributeContext, ChildContext, DescendantContext, EvalContext, InitialContext, NamespaceContext, NodeSetContext, ParentContext, PrecedingOrFollowingContext, PredicateContext, RootContext, SelfContext, UnionContext
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 Details

    • getContextNodeList

      List<Pointer> getContextNodeList()
      Gets the current context node list. Each element of the list is a Pointer.
      Returns:
      A list representing the current context nodes.

    • getContextNodePointer

      Pointer getContextNodePointer()
      Gets the current context node.
      Returns:
      The current context node pointer.

    • getJXPathContext

      JXPathContext getJXPathContext()
      Gets the JXPathContext in which this function is being evaluated.
      Returns:
      A list representing the current context nodes.

    • getPosition

      int getPosition()
      Returns the current context position.
      Returns:
      int