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<?php /** * Hoa * * * @license * * New BSD License * * Copyright © 2007-2017, Hoa community. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of the Hoa nor the names of its contributors may be * used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ namespace Hoa\Iterator; /** * Class \Hoa\Iterator\Demultiplexer. * * Demux result from another iterator. * This iterator is somehow the opposite of the Hoa\Iterator\Multiple iterator. * * @copyright Copyright © 2007-2017 Hoa community * @license New BSD License */ class Demultiplexer implements Iterator { /** * Current iterator. * * @var \Traversable */ protected $_iterator = null; /** * Current computed value. * * @var mixed */ protected $_current = null; /** * Demuxer (callable to execute each time). * * @var callable */ protected $_demuxer = null; /** * Constructor. * * @param \Traversable $iterator Iterator. * @param callable $demuxer Demuxer. * @throws \Hoa\Iterator\Exception */ public function __construct(\Traversable $iterator, $demuxer) { if ($iterator instanceof \IteratorAggregate) { $iterator = $iterator->getIterator(); } $this->_iterator = $iterator; $this->_demuxer = $demuxer; return; } /** * Return the current element. * * @return mixed */ public function current() { if (null !== $this->_current) { return $this->_current; } $demuxer = $this->_demuxer; return $this->_current = $demuxer($this->_iterator->current()); } /** * Return the key of the current element. * * @return mixed */ public function key() { return $this->_iterator->key(); } /** * Move forward to next element. * * @return void */ public function next() { $this->_current = null; return $this->_iterator->next(); } /** * Rewind the iterator to the first element. * * @return void */ public function rewind() { return $this->_iterator->rewind(); } /** * Check if current position is valid. * * @return bool */ public function valid() { return $this->_iterator->valid(); } }
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