class.ilADTEnum.php

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<?php
 
abstract class ilADTEnum extends ilADT
{
        protected $value; // [string]
        
        
        // definition
        
        protected function isValidDefinition(ilADTDefinition $a_def)
        {
                return ($a_def instanceof ilADTEnumDefinition);
        }
        
        public function reset()
        {
                parent::reset();
                
                $this->value = null;
        }
        
        
        // properties
        
        abstract protected function handleSelectionValue($a_value);
        
        public function setSelection($a_value = null)
        {
                if($a_value !== null)
                {
                        $a_value = $this->handleSelectionValue($a_value);
                        if(!$this->isValidOption($a_value))
                        {
                                $a_value = null;
                        }
                }
                $this->value = $a_value;
        }
        
        public function getSelection()
        {
                return $this->value;
        }
        
        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->getSelection() === $a_adt->getSelection());
                }
        }
                                
        public function isLarger(ilADT $a_adt)
        {
                // return null?
        }
 
        public function isSmaller(ilADT $a_adt)
        {
                // return null?
        }
        
        
        // null
        
        public function isNull()
        {               
                return ($this->getSelection() === null);
        }
                
        
        // check
        
        public function getCheckSum()
        {
                if(!$this->isNull())
                {
                        return (string)$this->getSelection();
                }
        }       
}
 
?>