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();
        }
    }
}