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<?php
/** @file appenditerator.inc
* @ingroup SPL
* @brief class AppendIterator
* @author Marcus Boerger
* @date 2003 - 2009
*
* SPL - Standard PHP Library
*/
/** @ingroup SPL
* @brief Iterator that iterates over several iterators one after the other
* @author Marcus Boerger
* @version 1.0
* @since PHP 5.1
*/
class AppendIterator implements OuterIterator
{
/** @internal array of inner iterators */
private $iterators;
/** Construct an empty AppendIterator
*/
function __construct()
{
$this->iterators = new ArrayIterator();
}
/** Append an Iterator
* @param $it Iterator to append
*
* If the current state is invalid but the appended iterator is valid
* the AppendIterator itself becomes valid. However there will be no
* call to $it->rewind(). Also if the current state is invalid the inner
* ArrayIterator will be rewound und forwarded to the appended element.
*/
function append(Iterator $it)
{
$this->iterators->append($it);
}
/** @return the current inner Iterator
*/
function getInnerIterator()
{
return $this->iterators->current();
}
/** Rewind to the first element of the first inner Iterator.
* @return void
*/
function rewind()
{
$this->iterators->rewind();
if ($this->iterators->valid())
{
$this->getInnerIterator()->rewind();
}
}
/** @return whether the current element is valid
*/
function valid()
{
return $this->iterators->valid() && $this->getInnerIterator()->valid();
}
/** @return the current value if it is valid or \c NULL
*/
function current()
{
/* Using $this->valid() would be exactly the same; it would omit
* the access to a non valid element in the inner iterator. Since
* the user didn't respect the valid() return value false this
* must be intended hence we go on. */
return $this->iterators->valid() ? $this->getInnerIterator()->current() : NULL;
}
/** @return the current key if it is valid or \c NULL
*/
function key()
{
return $this->iterators->valid() ? $this->getInnerIterator()->key() : NULL;
}
/** Move to the next element. If this means to another Iterator that
* rewind that Iterator.
* @return void
*/
function next()
{
if (!$this->iterators->valid())
{
return; /* done all */
}
$this->getInnerIterator()->next();
if ($this->getInnerIterator()->valid())
{
return; /* found valid element in current inner iterator */
}
$this->iterators->next();
while ($this->iterators->valid())
{
$this->getInnerIterator()->rewind();
if ($this->getInnerIterator()->valid())
{
return; /* found element as first elemet in another iterator */
}
$this->iterators->next();
}
}
/** Aggregates the inner iterator
*/
function __call($func, $params)
{
return call_user_func_array(array($this->getInnerIterator(), $func), $params);
}
}
?>
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