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Filename : manifest.php
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<?php
/**
 * @package     Joomla.Libraries
 * @subpackage  Installer
 *
 * @copyright   Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

jimport('joomla.filesystem.file');

/**
 * Joomla! Package Manifest File
 *
 * @since  3.1
 */
abstract class JInstallerManifest
{
	/**
	 * Path to the manifest file
	 *
	 * @var    string
	 * @since  3.1
	 */
	public $manifest_file = '';

	/**
	 * Name of the extension
	 *
	 * @var    string
	 * @since  3.1
	 */
	public $name = '';

	/**
	 * Version of the extension
	 *
	 * @var    string
	 * @since  3.1
	 */
	public $version = '';

	/**
	 * Description of the extension
	 *
	 * @var    string
	 * @since  3.1
	 */
	public $description = '';

	/**
	 * Packager of the extension
	 *
	 * @var    string
	 * @since  3.1
	 */
	public $packager = '';

	/**
	 * Packager's URL of the extension
	 *
	 * @var    string
	 * @since  3.1
	 */
	public $packagerurl = '';

	/**
	 * Update site for the extension
	 *
	 * @var    string
	 * @since  3.1
	 */
	public $update = '';

	/**
	 * List of files in the extension
	 *
	 * @var    array
	 * @since  3.1
	 */
	public $filelist = array();

	/**
	 * Constructor
	 *
	 * @param   string  $xmlpath  Path to XML manifest file.
	 *
	 * @since   3.1
	 */
	public function __construct($xmlpath = '')
	{
		if (strlen($xmlpath))
		{
			$this->loadManifestFromXml($xmlpath);
		}
	}

	/**
	 * Load a manifest from a file
	 *
	 * @param   string  $xmlfile  Path to file to load
	 *
	 * @return  boolean
	 *
	 * @since   3.1
	 */
	public function loadManifestFromXml($xmlfile)
	{
		$this->manifest_file = basename($xmlfile, '.xml');

		$xml = simplexml_load_file($xmlfile);

		if (!$xml)
		{
			$this->_errors[] = JText::sprintf('JLIB_INSTALLER_ERROR_LOAD_XML', $xmlfile);

			return false;
		}
		else
		{
			$this->loadManifestFromData($xml);

			return true;
		}
	}

	/**
	 * Apply manifest data from a SimpleXMLElement to the object.
	 *
	 * @param   SimpleXMLElement  $xml  Data to load
	 *
	 * @return  void
	 *
	 * @since   3.1
	 */
	abstract protected function loadManifestFromData(SimpleXmlElement $xml);
}