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SubIteratorIterator.php
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SubIteratorIterator.php
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<?php
/*
* Iterator Garden - Let Iterators grow like flowers in the garden.
* Copyright 2013, 2014 hakre <http://hakre.wordpress.com/>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Class SubIteratorIterator
*/
class SubIteratorIterator extends TraversableDecorator
{
const UP = 0;
const DOWN = 1;
const USE_ITERATOR = 0;
const USE_KEY = 1;
/**
* @var RecursiveIteratorIterator
*/
private $iterator;
private $flags;
private $direction;
public function __construct(RecursiveIteratorIterator $iterator, $flags = self::USE_ITERATOR, $direction = self::UP)
{
$this->iterator = $iterator;
$this->flags = (int)$flags;
$this->direction = (int)(bool)$direction;
parent::__construct();
}
public function rewind()
{
$low = 0;
$high = $this->iterator->getDepth();
if ($this->direction === self::DOWN) {
list($high, $low) = array($low, $high);
}
$this->traversable = new RangeIterator($low, $high, 1);
}
public function current()
{
$level = parent::current();
$subIterator = $this->iterator->getSubIterator($level);
return ($this->flags & self::USE_KEY) ? $subIterator->key() : $subIterator;
}
}