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<?php
/** @file keyfilter.inc
* @ingroup Examples
* @brief class KeyFilter
* @author Marcus Boerger
* @date 2003 - 2005
*
* SPL - Standard PHP Library
*/
/** @ingroup Examples
* @brief Regular expression filter for string iterators
* @author Marcus Boerger
* @version 1.1
*
* Instances of this class act as a filter around iterators whose elements
* are strings. In other words you can put an iterator into the constructor
* and the instance will only return elements which match the given regular
* expression.
*/
class KeyFilter extends FilterIterator
{
/** @internal regular exoression used as filter */
private $regex;
/**
* Constructs a filter around an iterator whose elemnts are strings.
* If the given iterator is of type spl_sequence then its rewind()
* method is called.
*
* @param it Object that implements at least spl_forward
* @param regex Regular expression used as a filter.
*/
function __construct(Iterator $it, $regex)
{
parent::__construct($it);
$this->regex = $regex;
}
/** \return whether the current key mathes the regular expression
*/
function accept()
{
return ereg($this->regex, $this->getInnerIterator()->key());
}
/** @return regular expression used as filter
*/
function getRegex()
{
return $this->regex;
}
/**
* hidden __clone
*/
protected function __clone()
{
// disallow clone
}
}
?>
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