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 Summary

Modifier and Type	Method	Description
List<Pointer>	getContextNodeList()	Gets the current context node list.
Pointer	getContextNodePointer()	Gets the current context node.
JXPathContext	getJXPathContext()	Gets the JXPathContext in which this function is being evaluated.
int	getPosition()	Returns the current context position.

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