class.ilADTMultiEnum.php

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<?php
 
abstract class ilADTMultiEnum extends ilADT
{
        protected $values; // [array]
                
        public function getType()
        {
                return "MultiEnum";
        }
        
        
        // definition
        
        protected function isValidDefinition(ilADTDefinition $a_def)
        {
                return ($a_def instanceof ilADTMultiEnumDefinition);
        }
        
        public function reset()
        {
                parent::reset();
                
                $this->values = null;
        }
        
        
        // properties
        
        abstract protected function handleSelectionValue($a_value);             
        
        public function setSelections(array $a_values = null)
        {
                if($a_values !== null)
                {
                        foreach($a_values as $idx => $value)
                        {
                                $value = $this->handleSelectionValue($value);
                                if(!$this->isValidOption($value))
                                {
                                        unset($a_values[$idx]);
                                }
                        }
                        if(!sizeof($a_values))
                        {
                                $a_values = null;
                        }
                }
                $this->values = $a_values;
        }
        
        public function getSelections()
        {
                return $this->values;
        }
                                
        public function isValidOption($a_value)
        {               
                $a_value = $this->handleSelectionValue($a_value);
                return array_key_exists($a_value, $this->getDefinition()->getOptions());
        }
        
        
        // comparison
        
        public function equals(ilADT $a_adt)
        {
                if($this->getDefinition()->isComparableTo($a_adt))
                {                       
                        return ($this->getCheckSum() === $a_adt->getCheckSum());
                }
        }
                                
        public function isLarger(ilADT $a_adt)
        {
                // return null?
        }
 
        public function isSmaller(ilADT $a_adt)
        {
                // return null?
        }
        
        
        // null
        
        public function isNull()
        {               
                return ($this->getSelections() === null);
        }
                
        
        // check
        
        public function getCheckSum()
        {
                if(!$this->isNull())
                {
                        $current = $this->getSelections();
                        sort($current);                 
                        return md5(implode(",", $current));
                }
        }       
}
 
?>