org.jaxen.function
Class CountFunction

java.lang.Object
  org.jaxen.function.CountFunction

All 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

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

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CountFunction

public CountFunction()

Create a new CountFunction object.

Method Detail

call

public java.lang.Object call(Context context,
                             java.util.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 java.lang.Double evaluate(java.lang.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