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<?php
/**
* @brief Regular expression filter for string iterators
* @author Marcus Boerger
* @version 1.0
*
* Instances of this class act as a filter around iterators. In other words
* you can put an iterator into the constructor and the instance will only
* return selected (accepted) elements.
*/
abstract class FilterIterator implements Iterator
{
protected $it;
/**
* 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
*/
function __construct(Iterator $it) {
$this->it = $it;
}
/**
* Rewind the inner iterator.
*/
function rewind() {
$this->it->rewind();
$this->fetch();
}
/**
* Accept function to decide whether an element of the inner iterator
* should be accessible through the Filteriterator.
*
* @return whether or not to expose the current element of the inner
* iterator.
*/
abstract function accept();
/**
* Fetch next element and store it.
*
* @return void
*/
protected function fetch() {
while ($this->it->hasMore()) {
if ($this->accept()) {
return;
}
$this->it->next();
};
}
/**
* Move to next element
*
* @return void
*/
function next() {
$this->it->next();
$this->fetch();
}
/**
* @return Whether more elements are available
*/
function hasMore() {
return $this->it->hasMore();
}
/**
* @return The current key
*/
function key() {
return $this->it->key();
}
/**
* @return The current value
*/
function current() {
return $this->it->current();
}
/**
* hidden __clone
*/
protected function __clone() {
// disallow clone
}
}
?>
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