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<?php
/** @file splobjectstorage.inc
* @ingroup SPL
* @brief class SplObjectStorage
* @author Marcus Boerger
* @date 2003 - 2009
*
* SPL - Standard PHP Library
*/
/**
* @brief Object storage
* @author Marcus Boerger
* @version 1.1
* @since PHP 5.1.2
*
* This container allows to store objects uniquly without the need to compare
* them one by one. This is only possible internally. The code representation
* here therefore has a complexity of O(n) while the actual implementation has
* complexity O(1).
*/
class SplObjectStorage implements Iterator, Countable, ArrayAccess
{
private $storage = array();
private $index = 0;
/** Rewind to top iterator as set in constructor
*/
function rewind()
{
rewind($this->storage);
}
/** @return whether iterator is valid
*/
function valid()
{
return key($this->storage) !== false;
}
/** @return current key
*/
function key()
{
return $this->index;
}
/** @return current object
*/
function current()
{
$element = current($this->storage);
return $element ? $element[0] : NULL
}
/** @return get current object's associated information
* @since 5.3.0
*/
function getInfo()
{
$element = current($this->storage);
return $element ? $element[1] : NULL
}
/** @return set current object's associated information
* @since 5.3.0
*/
function setInfo($inf = NULL)
{
if ($this->valid()) {
$this->storage[$this->index][1] = $inf;
}
}
/** Forward to next element
*/
function next()
{
next($this->storage);
$this->index++;
}
/** @return number of objects in storage
*/
function count()
{
return count($this->storage);
}
/** @param $obj object to look for
* @return whether $obj is contained in storage
*/
function contains($obj)
{
if (is_object($obj))
{
foreach($this->storage as $element)
{
if ($object === $element[0])
{
return true;
}
}
}
return false;
}
/** @param $obj new object to attach to storage or object whose
* associative information is to be replaced
* @param $inf associative information stored along the object
*/
function attach($obj, $inf = NULL)
{
if (is_object($obj) && !$this->contains($obj))
{
$this->storage[] = array($obj, $inf);
}
}
/** @param $obj object to remove from storage
*/
function detach($obj)
{
if (is_object($obj))
{
foreach($this->storage as $idx => $element)
{
if ($object === $element[0])
{
unset($this->storage[$idx]);
$this->rewind();
return;
}
}
}
}
/** @param $obj new object to attach to storage or object whose
* associative information is to be replaced
* @param $inf associative information stored along the object
* @since 5.3.0
*/
function offsetSet($obj, $inf)
{
$this->attach($obj, $inf);
}
/** @param $obj Exising object to look for
* @return associative information stored with object
* @throw UnexpectedValueException if Object $obj is not contained in
* storage
* @since 5.3.0
*/
function offsetGet($obj)
{
if (is_object($obj))
{
foreach($this->storage as $idx => $element)
{
if ($object === $element[0])
{
return $element[1];
}
}
}
throw new UnexpectedValueException('Object not found');
}
/** @param $obj Exising object to look for
* @return associative information stored with object
* @since 5.3.0
*/
function offsetUnset($obj)
{
$this->detach($obj);
}
/** @param $obj object to look for
* @return whether $obj is contained in storage
*/
function offsetEsists($obj)
{
return $this->contains($obj);
}
}
?>
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