com.japisoft.xpath.function.basic
Class Boolean

java.lang.Object
  |
  +--com.japisoft.xpath.function.AbstractFunction
        |
        +--com.japisoft.xpath.function.basic.Boolean

All Implemented Interfaces:

Function

public final class Boolean

extends AbstractFunction

function converts its argument to a boolean as follows: a number is true if and only if it is neither positive or negative zero nor NaN a node-set is true if and only if it is non-empty a string is true if and only if its length is non-zero an object of a type other than the four basic types is converted to a boolean in a way that is dependent on that type

Version:

1.1

Author:

(c) 2003 JAPISOFT

Constructor Summary

Boolean()

Method Summary

java.lang.Object

eval(XPathContext context, FastVector arg) Evalute this function for this context and the following arguments

Methods inherited from class com.japisoft.xpath.function.AbstractFunction

checkOneNodeSet, checkOneNumber, checkOneParameter, checkOneString, checkThreeStrings, checkTwoStrings, getString1, getString2, toString

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

Boolean

public Boolean()

Method Detail

eval

public java.lang.Object eval(XPathContext context,
                             FastVector arg)

Description copied from class: AbstractFunction

Evalute this function for this context and the following arguments

Specified by:

eval in interface Function

Specified by:

eval in class AbstractFunction

Parameters:

arg - a Vector value, this is the responsability of the function to test the argument type

Returns:

an Object value like Integer, Boolean, String or NodeSet