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<?php
namespace SMW\Iterators;
use ArrayIterator;
use Countable;
use Iterator;
use IteratorIterator;
use RuntimeException;
/**
* This iterator is expected to be called in combination with another iterator
* (or traversable/array) in order to apply a mapping on the returned current element
* during an iterative (foreach etc.) process.
*
* @license GNU GPL v2+
* @since 2.5
*
* @author mwjames
*/
class MappingIterator extends IteratorIterator implements Countable {
/**
* @var callable
*/
private $callback;
/**
* @var integer
*/
private $count = 1;
/**
* @since 2.5
*
* @param Iterator|array $iterable
* @param callable $callback
*/
public function __construct( $iterable, callable $callback ) {
if ( is_array( $iterable ) ) {
$iterable = new ArrayIterator( $iterable );
}
if ( !$iterable instanceof Iterator ) {
throw new RuntimeException( "MappingIterator expected an Iterator" );
}
if ( $iterable instanceof Countable ) {
$this->count = $iterable->count();
}
parent::__construct( $iterable );
$this->callback = $callback;
}
/**
* @see Countable::count
* @since 2.5
*
* {@inheritDoc}
*/
public function count() {
return $this->count;
}
/**
* @since 2.5
*
* {@inheritDoc}
*/
public function current() {
return call_user_func( $this->callback, parent::current() );
}
}
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