org.jaxen.function
Class CountFunction

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

public class CountFunction
extends 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.
 
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 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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