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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();
+ }
+}