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:
You can then register this extension function using apublic class MyExtenstionFunctions { public static String objectType(ExpressionContext context) { Object value = context.getContextNodePointer().getValue(); if (value == null) { return "null"; } return value.getClass().getName(); } }
ClassFunctions
object and call it like this: This expression will find all nodes of the graph that are dates."/descendent-or-self::node()[ns:objectType() = 'java.util.Date']"
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Method Details
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getContextNodeList
Gets the current context node list. Each element of the list is a Pointer.- Returns:
- A list representing the current context nodes.
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getContextNodePointer
Gets the current context node.- Returns:
- The current context node pointer.
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getJXPathContext
Gets the JXPathContext in which this function is being evaluated.- Returns:
- A list representing the current context nodes.
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getPosition
int getPosition()Returns the current context position.- Returns:
- int
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