Source for file BooleanValidatorRule.class.php

<?php
 
require_once(HARMONI."utilities/FieldSetValidator/rules/ValidatorRule.interface.php");
 
/**
 * the BooleanValidatorRule checks a given value to make sure it's a boolean value
 *
 * @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: BooleanValidatorRule.class.php,v 1.5 2007/09/04 20:25:55 adamfranco Exp $
 */ 
class BooleanValidatorRule
    extends ValidatorRuleInterface 
{
    /**
     * checks a given value to make sure it's boolean
     * @param mixed $val the value to check
     * @access public
     * @return boolean true if the value is boolean, false if it is not
     ***/
    function check( $val ) {
        if (is_bool($val)) return true;
        return false;
    }
    
    /**
     * 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];
    }
}
 
?>