OrderQuery::compatibleAddFilter

public function compatibleAddFilter($key, $value)
{
	$keyMatch = static::explodeFilterKey($key);
	$modifier = $keyMatch['modifier'];
	$operator = $keyMatch['operator'];
	$alias    = $keyMatch['alias'   ];

	if (! $name = $this->getAliasName($alias))
		return $this;

	switch ($operator)
	{
		case  '':
		case '@': $operator = ($modifier === '*' ? '' : '=');
			break;

		case '~': $operator =  '';
			break;
		// default: with no changes
	}

	switch ($modifier)
	{
		case '*':
		case '' : return $this->addFilter($modifier.$operator.$name, $value);

		case '!': return $operator == '=' && $value
			? $this->addFilter(null, array('LOGIC' => 'OR', array('!='.$name => $value), array('='.$name => '')))
			: $this->addFilter($modifier.$operator.$name, $value);

		case '+': return $this->addFilter(null, array('LOGIC' => 'OR', array($operator.$name => $value), array('='.$name => '')));

		default : throw new SystemException("invalid modifier '$modifier'", 0, __FILE__, __LINE__);
	}
}