org.jaxen.function

Class CountFunction

java.lang.Object

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

Constructors

Constructor and Description
CountFunction() Create a new CountFunction object.

Method Summary

Methods

Modifier and Type	Method and Description
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