org.jaxen.function
Class NamespaceUriFunction

java.lang.Object
  extended by org.jaxen.function.NamespaceUriFunction
All Implemented Interfaces:
Function

public class NamespaceUriFunction
extends Object
implements Function

4.1 string namespace-uri(node-set?)

The namespace-uri function returns the namespace URI of the expanded-name of the node in the argument node-set that is first in document order. If the argument node-set is empty, the first node has no expanded-name, or the namespace URI of the expanded-name is null, an empty string is returned. If the argument is omitted, it defaults to a node-set with the context node as its only member.

NOTE: The string returned by the namespace-uri function will be empty except for element nodes and attribute nodes.

Author:
bob mcwhirter (bob @ werken.com)
See Also:
Section 4.1 of the XPath Specification

Constructor Summary
NamespaceUriFunction()
          Create a new NamespaceUriFunction object.
 
Method Summary
 Object call(Context context, List args)
          Returns the namespace URI of the specified node or the namespace URI of the context node if no arguments are provided.
static String evaluate(List list, Navigator nav)
          Returns the namespace URI of list.get(0)
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

NamespaceUriFunction

public NamespaceUriFunction()
Create a new NamespaceUriFunction object.

Method Detail

call

public Object call(Context context,
                   List args)
            throws FunctionCallException
Returns the namespace URI of the specified node or the namespace URI of the context node if no arguments are provided.

Specified by:
call in interface Function
Parameters:
context - the context at the point in the expression where the function is called
args - a List containing zero or one items
Returns:
a String containing the namespace URI
Throws:
FunctionCallException - if args has more than one item

evaluate

public static String evaluate(List list,
                              Navigator nav)
                       throws FunctionCallException
Returns the namespace URI of list.get(0)

Parameters:
list - a list of nodes
nav - the Navigator used to retrieve the namespace
Returns:
the namespace URI of list.get(0)
Throws:
FunctionCallException - if list.get(0) is not a node


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