Source for file DoubleValidatorRule.class.php

<?php
 
require_once(HARMONI."utilities/FieldSetValidator/rules/ValidatorRule.interface.php");
 
/**
 * the DoubleValidatorRule checks a given value to make sure it's Double
 *
 * @package harmoni.utilities.fieldsetvalidator.rules
 * 
 * @copyright Copyright &copy; 2005, Middlebury College
 * @license http://www.gnu.org/copyleft/gpl.html GNU General Public License (GPL)
 *
 * @version $Id: DoubleValidatorRule.class.php,v 1.5 2007/09/04 20:25:55 adamfranco Exp $
 */ 
class DoubleValidatorRule
    extends ValidatorRuleInterface 
{
    /**
     * Checks a given value to make sure it's an Double.
     * Checks a given value to make sure it's an Double.
     * @param mixed $val The value to check.
     * @access public
     * @return boolean TRUE, if the value is an Double; FALSE if it is not.
     ***/
    function check( $val ) {
        return (is_double($val) || $val === 0.0);
    }
    
    /**
     * This is a static method to return an already-created instance of a validator
     * rule. There are at most about a hundred unique rule objects in use durring
     * any given execution cycle, but rule objects are instantiated hundreds of
     * thousands of times.
     *
     * This method follows a modified Singleton pattern
     * 
     * @return object ValidatorRule 
     * @access public
     * @static
     * @since 3/28/05
     */
    function getRule () {
        // Because there is no way in PHP to get the class name of the descendent
        // class on which this method is called, this method must be implemented
        // in each descendent class.
 
        if (!isset($GLOBALS['validator_rules']) || !is_array($GLOBALS['validator_rules']))
            $GLOBALS['validator_rules'] = array();
        
        $class = __CLASS__;
        if (!isset($GLOBALS['validator_rules'][$class]))
            $GLOBALS['validator_rules'][$class] = new $class;
        
        return $GLOBALS['validator_rules'][$class];
    }
}
 
?>