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<?php
/**
* @package Joomla.Platform
* @subpackage Table
*
* @copyright Copyright (C) 2005 - 2015 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
defined('JPATH_PLATFORM') or die;
/**
* Table class supporting modified pre-order tree traversal behavior.
*
* @link https://docs.joomla.org/JTableObserver
* @since 3.2
*/
class JTableObserverContenthistory extends JTableObserver
{
/**
* Helper object for storing and deleting version history information associated with this table observer
*
* @var JHelperContenthistory
* @since 3.2
*/
protected $contenthistoryHelper;
/**
* The pattern for this table's TypeAlias
*
* @var string
* @since 3.2
*/
protected $typeAliasPattern = null;
/**
* Not public, so marking private and deprecated, but needed internally in parseTypeAlias for
* PHP < 5.4.0 as it's not passing context $this to closure function.
*
* @var JTableObserverContenthistory
* @since 3.2
* @deprecated Never use this
* @private
*/
public static $_myTableForPregreplaceOnly;
/**
* Creates the associated observer instance and attaches it to the $observableObject
* Creates the associated content history helper class instance
* $typeAlias can be of the form "{variableName}.type", automatically replacing {variableName} with table-instance variables variableName
*
* @param JObservableInterface $observableObject The subject object to be observed
* @param array $params ( 'typeAlias' => $typeAlias )
*
* @return JTableObserverContenthistory
*
* @since 3.2
*/
public static function createObserver(JObservableInterface $observableObject, $params = array())
{
$typeAlias = $params['typeAlias'];
$observer = new self($observableObject);
$observer->contenthistoryHelper = new JHelperContenthistory($typeAlias);
$observer->typeAliasPattern = $typeAlias;
return $observer;
}
/**
* Post-processor for $table->store($updateNulls)
*
* @param boolean &$result The result of the load
*
* @return void
*
* @since 3.2
*/
public function onAfterStore(&$result)
{
if ($result)
{
$this->parseTypeAlias();
$aliasParts = explode('.', $this->contenthistoryHelper->typeAlias);
if (JComponentHelper::getParams($aliasParts[0])->get('save_history', 0))
{
$this->contenthistoryHelper->store($this->table);
}
}
}
/**
* Pre-processor for $table->delete($pk)
*
* @param mixed $pk An optional primary key value to delete. If not set the instance property value is used.
*
* @return void
*
* @since 3.2
* @throws UnexpectedValueException
*/
public function onBeforeDelete($pk)
{
$this->parseTypeAlias();
$aliasParts = explode('.', $this->contenthistoryHelper->typeAlias);
if (JComponentHelper::getParams($aliasParts[0])->get('save_history', 0))
{
$this->parseTypeAlias();
$this->contenthistoryHelper->deleteHistory($this->table);
}
}
/**
* Internal method
* Parses a TypeAlias of the form "{variableName}.type", replacing {variableName} with table-instance variables variableName
* Storing result into $this->contenthistoryHelper->typeAlias
*
* @return void
*
* @since 3.2
*/
protected function parseTypeAlias()
{
// Needed for PHP < 5.4.0 as it's not passing context $this to closure function
static::$_myTableForPregreplaceOnly = $this->table;
$this->contenthistoryHelper->typeAlias = preg_replace_callback('/{([^}]+)}/',
function($matches)
{
return JTableObserverContenthistory::$_myTableForPregreplaceOnly->{$matches[1]};
},
$this->typeAliasPattern
);
}
}