ExpressionContext (Commons JXPath 1.3 API)

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Detail:
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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

Methods
Modifier and Type	Method and Description
`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
```
JXPathContext getJXPathContext()
```
    Get the JXPathContext in which this function is being evaluated.
    
    Returns:
    A list representing the current context nodes.
  - getContextNodePointer
```
Pointer getContextNodePointer()
```
    Get the current context node.
    
    Returns:
    The current context node pointer.
  - getContextNodeList
```
List getContextNodeList()
```
    Get the current context node list. Each element of the list is a Pointer.
    
    Returns:
    A list representing the current context nodes.
  - getPosition
```
int getPosition()
```
    Returns the current context position.
    
    Returns:
    int

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