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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Form\Util;
/**
* Iterator for {@link OrderedHashMap} objects.
*
* This class is internal and should not be used.
*
* @author Bernhard Schussek <bschussek@gmail.com>
*
* @since 2.2.6
*/
class OrderedHashMapIterator implements \Iterator
{
/**
* @var array
*/
private $elements;
/**
* @var array
*/
private $orderedKeys;
/**
* @var integer
*/
private $cursor;
/**
* @var integer
*/
private $cursorId;
/**
* @var array
*/
private $managedCursors;
/**
* @var string|integer|null
*/
private $key;
/**
* @var mixed
*/
private $current;
/**
* Creates a new iterator.
*
* @param array $elements The elements of the map, indexed by their
* keys.
* @param array $orderedKeys The keys of the map in the order in which
* they should be iterated.
* @param array $managedCursors An array from which to reference the
* iterator's cursor as long as it is alive.
* This array is managed by the corresponding
* {@link OrderedHashMap} instance to support
* recognizing the deletion of elements.
*
* @since 2.2.6
*/
public function __construct(array &$elements, array &$orderedKeys, array &$managedCursors)
{
$this->elements = &$elements;
$this->orderedKeys = &$orderedKeys;
$this->managedCursors = &$managedCursors;
$this->cursorId = count($managedCursors);
$this->managedCursors[$this->cursorId] = &$this->cursor;
}
/**
* Removes the iterator's cursors from the managed cursors of the
* corresponding {@link OrderedHashMap} instance.
*
* @since 2.2.6
*/
public function __destruct()
{
// Use array_splice() instead of isset() to prevent holes in the
// array indices, which would break the initialization of $cursorId
array_splice($this->managedCursors, $this->cursorId, 1);
}
/**
*{@inheritdoc}
*
* @since 2.2.6
*/
public function current()
{
return $this->current;
}
/**
* {@inheritdoc}
*
* @since 2.2.6
*/
public function next()
{
++$this->cursor;
if (isset($this->orderedKeys[$this->cursor])) {
$this->key = $this->orderedKeys[$this->cursor];
$this->current = $this->elements[$this->key];
} else {
$this->key = null;
$this->current = null;
}
}
/**
*{@inheritdoc}
*
* @since 2.2.6
*/
public function key()
{
return $this->key;
}
/**
*{@inheritdoc}
*
* @since 2.2.6
*/
public function valid()
{
return null !== $this->key;
}
/**
*{@inheritdoc}
*
* @since 2.2.6
*/
public function rewind()
{
$this->cursor = 0;
if (isset($this->orderedKeys[0])) {
$this->key = $this->orderedKeys[0];
$this->current = $this->elements[$this->key];
} else {
$this->key = null;
$this->current = null;
}
}
}