<?php
/**
* Object_Freezer
*
* Copyright (c) 2008-2011, Sebastian Bergmann <sb@sebastian-bergmann.de>.
* 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 Sebastian Bergmann nor the names of his
* 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 OWNER OR 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.
*
* @package Object_Freezer
* @author Sebastian Bergmann <sb@sebastian-bergmann.de>
* @copyright 2008-2011 Sebastian Bergmann <sb@sebastian-bergmann.de>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @since File available since Release 1.0.0
*/
/**
* Proxy for a frozen object that is replaced with a thawed object when needed.
*
* @package Object_Freezer
* @author Sebastian Bergmann <sb@sebastian-bergmann.de>
* @copyright 2008-2011 Sebastian Bergmann <sb@sebastian-bergmann.de>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
* @version Release: 1.0.0
* @link http://github.com/sebastianbergmann/php-object-freezer/
* @since Class available since Release 1.0.0
*/
class Object_Freezer_LazyProxy
{
/**
* @var Object_Freezer_Storage
*/
protected $storage;
/**
* @var string
*/
protected $uuid;
/**
* @var object
*/
protected $thawedObject;
/**
* Constructor.
*
* @param Object_Freezer_Storage $storage
* @param string $uuid
*/
public function __construct(Object_Freezer_Storage $storage, $uuid)
{
$this->storage = $storage;
$this->uuid = $uuid;
}
/**
* Returns the real object.
*
* @return object
*/
public function getObject()
{
if ($this->thawedObject === NULL) {
$this->thawedObject = $this->storage->fetch($this->uuid);
}
return $this->thawedObject;
}
/**
* Delegates the attribute read access to the real object and
* tries to replace the lazy proxy object with it.
*
* @param string $name
* @return mixed
*/
public function __get($name)
{
$object = $this->replaceProxy(2);
$attribute = new ReflectionProperty($object, $name);
$attribute->setAccessible(TRUE);
return $attribute->getValue($object);
}
/**
* Delegates the attribute write access to the real object and
* tries to replace the lazy proxy object with it.
*
* @param string $name
* @param mixed $value
*/
public function __set($name, $value)
{
$object = $this->replaceProxy(2);
$attribute = new ReflectionProperty($object, $name);
$attribute->setAccessible(TRUE);
$attribute->setValue($object, $value);
}
/**
* Delegates the message to the real object and
* tries to replace the lazy proxy object with it.
*
* @param string $name
* @param array $arguments
* @return mixed
*/
public function __call($name, array $arguments)
{
$object = $this->replaceProxy(3);
$reflector = new ReflectionMethod($object, $name);
return $reflector->invokeArgs($object, $arguments);
}
/**
* Tries to replace the lazy proxy object with the real object.
*
* @param integer $offset
* @return object
*/
protected function replaceProxy($offset)
{
$object = $this->getObject();
/**
* 0: LazyProxy::replaceProxy()
* 1: LazyProxy::__get($name) / LazyProxy::__set($name, $value)
* 2: Frame that accesses $name
* 1: LazyProxy::__call($method, $arguments)
* 2: LazyProxy::$method()
* 3: Frame that invokes $method
*/
$trace = debug_backtrace();
if (isset($trace[$offset]['object'])) {
$reflector = new ReflectionObject($trace[$offset]['object']);
foreach ($reflector->getProperties() as $attribute) {
$attribute->setAccessible(TRUE);
if ($attribute->getValue($trace[$offset]['object']) === $this) {
$attribute->setValue($trace[$offset]['object'], $object);
break;
}
}
}
return $object;
}
}