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));
        }
    }
}