class.ilADTBoolean.php

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<?php

class ilADTBoolean extends ilADT
{
        protected $value; // [bool]
        
        
        // definition
        
        protected function isValidDefinition(ilADTDefinition $a_def)
        {
                return ($a_def instanceof ilADTBooleanDefinition);
        }
        
        public function reset()
        {
                parent::reset();
                
                $this->value = null;
        }
        
        
        // properties
        
        public function setStatus($a_value = null)
        {
                if($a_value !== null)
                {
                        $a_value = (bool)$a_value;
                }
                $this->value = $a_value;                
        }
        
        public function getStatus()
        {               
                return $this->value;
        }
        
        
        // comparison
        
        public function equals(ilADT $a_adt)
        {
                if($this->isComparableTo($a_adt))
                {
                        return ($this->getStatus() === $a_adt->getStatus());
                }
        }
                                
        public function isLarger(ilADT $a_adt)
        {
                // return null?
        }

        public function isSmaller(ilADT $a_adt)
        {
                // return null?
        }
        
        
        // null
        
        public function isNull()
        {               
                return ($this->getStatus() === null);
        }
        
        
        // validation
        
        public function isValid()
        {
                return true;
        }
        
        
        // check
        
        public function getCheckSum()
        {               
                if(!$this->isNull())
                {
                        return (string)$this->getStatus();
                }
        }               
}

?>