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org.jaxen.function

Class CountFunction

Implemented Interfaces:
Function
public class CountFunction
extends java.lang.Object
implements Function
4.1 number count(node-set)
The count function returns the number of nodes in the argument node-set.
Author:
bob mcwhirter (bob @ werken.com)
See Also:
Section 4.1 of the XPath Specification

Constructor Summary

CountFunction()
Create a new CountFunction object.

Method Summary

Object
call(Context context, List args)
Returns the number of nodes in the specified node-set.
static Double
evaluate(Object obj)
Returns the number of nodes in the specified node-set.

Constructor Details

CountFunction

public CountFunction()
Create a new CountFunction object.

Method Details

call

public Object call(Context context,
                   List args)
            throws FunctionCallException
Returns the number of nodes in the specified node-set.
Specified by:
call in interface Function
Parameters:
context - ignored
args - the function arguments
Returns:
a Double giving the integral number of items in the first argument
Throws:
FunctionCallException - if args does not have exactly one item; or that item is not a List

evaluate

public static Double evaluate(Object obj)
            throws FunctionCallException
Returns the number of nodes in the specified node-set.
Parameters:
obj - a List of nodes
Returns:
the integral number of items in the list
Throws:
FunctionCallException - if obj is not a List

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