installer.php

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		$folder = ($element->attributes('destination')) ? DS.$element->attributes('destination') : null;
		$destination = JPath::clean(JPATH_ROOT.DS.'media'.$folder);

		/*
		 * Here we set the folder we are going to copy the files from.
		 *
		 * Does the element have a folder attribute?
		 *
		 * If so this indicates that the files are in a subdirectory of the source
		 * folder and we should append the folder attribute to the source path when
		 * copying files.
		 */
		if ($folder = $element->attributes('folder')) {
			$source = $this->getPath('source').DS.$folder;
		} else {
			$source = $this->getPath('source');
		}

		// Process each file in the $files array (children of $tagName).
		foreach ($files as $file)
		{
			$path['src']	= $source.DS.$file->data();
			$path['dest']	= $destination.DS.$file->data();

			/*
			 * Before we can add a file to the copyfiles array we need to ensure
			 * that the folder we are copying our file to exits and if it doesn't,
			 * we need to create it.
			 */
			if (basename($path['dest']) != $path['dest']) {
				$newdir = dirname($path['dest']);

				if (!JFolder::create($newdir)) {
					JError::raiseWarning(1, 'JInstaller::install: '.JText::_('Failed to create directory').' "'.$newdir.'"');
					return false;
				}
			}

			// Add the file to the copyfiles array
			$copyfiles[] = $path;
		}

		return $this->copyFiles($copyfiles);
	}

	/**
	 * Method to parse the parameters of an extension, build the INI
	 * string for it's default parameters, and return the INI string.
	 *
	 * @access	public
	 * @return	string	INI string of parameter values
	 * @since	1.5
	 */
	function getParams()
	{
		// Get the manifest document root element
		$root = & $this->_manifest->document;

		// Get the element of the tag names
		$element =& $root->getElementByPath('params');
		if (!is_a($element, 'JSimpleXMLElement') || !count($element->children())) {
			// Either the tag does not exist or has no children therefore we return zero files processed.
			return null;
		}

		// Get the array of parameter nodes to process
		$params = $element->children();
		if (count($params) == 0) {
			// No params to process
			return null;
		}

		// Process each parameter in the $params array.
		$ini = null;
		foreach ($params as $param) {
			if (!$name = $param->attributes('name')) {
				continue;
			}

			if (!$value = $param->attributes('default')) {
				continue;
			}

			$ini .= $name."=".$value."\n";
		}
		return $ini;
	}

	/**
	 * Copy files from source directory to the target directory
	 *
	 * @access	public
	 * @param	array $files array with filenames
	 * @param	boolean $overwrite True if existing files can be replaced
	 * @return	boolean True on success
	 * @since	1.5
	 */
	function copyFiles($files, $overwrite=null)
	{
		/*
		 * To allow for manual override on the overwriting flag, we check to see if
		 * the $overwrite flag was set and is a boolean value.  If not, use the object
		 * allowOverwrite flag.
		 */
		if (is_null($overwrite) || !is_bool($overwrite)) {
			$overwrite = $this->_overwrite;
		}

		/*
		 * $files must be an array of filenames.  Verify that it is an array with
		 * at least one file to copy.
		 */
		if (is_array($files) && count($files) > 0)
		{
			foreach ($files as $file)
			{
				// Get the source and destination paths
				$filesource	= JPath::clean($file['src']);
				$filedest	= JPath::clean($file['dest']);
				$filetype	= array_key_exists('type', $file) ? $file['type'] : 'file';

				if (!file_exists($filesource)) {
					/*
					 * The source file does not exist.  Nothing to copy so set an error
					 * and return false.
					 */
					JError::raiseWarning(1, 'JInstaller::install: '.JText::sprintf('File does not exist', $filesource));
					return false;
				} elseif (file_exists($filedest) && !$overwrite) {

						/*
						 * It's okay if the manifest already exists
						 */
						if ($this->getPath( 'manifest' ) == $filesource) {
							continue;
						}

						/*
						 * The destination file already exists and the overwrite flag is false.
						 * Set an error and return false.
						 */
						JError::raiseWarning(1, 'JInstaller::install: '.JText::sprintf('WARNSAME', $filedest));
						return false;
				} else {

					// Copy the folder or file to the new location.
					if ( $filetype == 'folder') {

						if (!(JFolder::copy($filesource, $filedest, null, $overwrite))) {
							JError::raiseWarning(1, 'JInstaller::install: '.JText::sprintf('Failed to copy folder to', $filesource, $filedest));
							return false;
						}

						$step = array ('type' => 'folder', 'path' => $filedest);
					} else {

						if (!(JFile::copy($filesource, $filedest))) {
							JError::raiseWarning(1, 'JInstaller::install: '.JText::sprintf('Failed to copy file to', $filesource, $filedest));
							return false;
						}

						$step = array ('type' => 'file', 'path' => $filedest);
					}

					/*
					 * Since we copied a file/folder, we want to add it to the installation step stack so that
					 * in case we have to roll back the installation we can remove the files copied.
					 */
					$this->_stepStack[] = $step;
				}
			}
		} else {

			/*
			 * The $files variable was either not an array or an empty array
			 */
			return false;
		}
		return count($files);
	}

	/**
	 * Method to parse through a files element of the installation manifest and remove
	 * the files that were installed
	 *
	 * @access	public
	 * @param	object	$element 	The xml node to process
	 * @param	int		$cid		Application ID of application to remove from
	 * @return	boolean	True on success
	 * @since	1.5
	 */
	function removeFiles($element, $cid=0)
	{
		// Initialize variables
		$removefiles = array ();
		$retval = true;

		// Get the client info
		jimport('joomla.application.helper');
		$client =& JApplicationHelper::getClientInfo($cid);

		if (!is_a($element, 'JSimpleXMLElement') || !count($element->children())) {
			// Either the tag does not exist or has no children therefore we return zero files processed.
			return true;
		}

		// Get the array of file nodes to process
		$files = $element->children();
		if (count($files) == 0) {
			// No files to process
			return true;
		}

		/*
		 * Here we set the folder we are going to remove the files from.  There are a few
		 * special cases that need to be considered for certain reserved tags.
		 */
		switch ($element->name())
		{
			case 'media':
				if ($element->attributes('destination')) {
					$folder = $element->attributes('destination');
				} else {
					$folder = '';
				}
				$source = $client->path.DS.'media'.DS.$folder;
				break;

			case 'languages':
				$source = $client->path.DS.'language';
				break;

			default:
				if ($client) {
					$pathname = 'extension_'.$client->name;
					$source = $this->getPath($pathname);
				} else {
					$pathname = 'extension_root';
					$source = $this->getPath($pathname);
				}
				break;
		}

		// Process each file in the $files array (children of $tagName).
		foreach ($files as $file)
		{
			/*
			 * If the file is a language, we must handle it differently.  Language files
			 * go in a subdirectory based on the language code, ie.
			 *
			 * 		<language tag="en_US">en_US.mycomponent.ini</language>
			 *
			 * would go in the en_US subdirectory of the languages directory.
			 */
			if ($file->name() == 'language' && $file->attributes('tag') != '') {
				$path = $source.DS.$file->attributes('tag').DS.basename($file->data());

				// If the language folder is not present, then the core pack hasn't been installed... ignore
				if (!JFolder::exists(dirname($path))) {
					continue;
				}
			} else {
				$path = $source.DS.$file->data();
			}

			/*
			 * Actually delete the files/folders
			 */
			if (is_dir($path)) {
				$val = JFolder::delete($path);
			} else {
				$val = JFile::delete($path);
			}

			if ($val === false) {
				$retval = false;
			}
		}

		return $retval;
	}

	/**
	 * Copies the installation manifest file to the extension folder in the given client
	 *
	 * @access	public
	 * @param	int		$cid	Where to copy the installfile [optional: defaults to 1 (admin)]
	 * @return	boolean	True on success, False on error
	 * @since	1.5
	 */
	function copyManifest($cid=1)
	{
		// Get the client info
		jimport('joomla.application.helper');
		$client =& JApplicationHelper::getClientInfo($cid);

		$path['src'] = $this->getPath('manifest');

		if ($client) {
			$pathname = 'extension_'.$client->name;
			$path['dest']  = $this->getPath($pathname).DS.basename($this->getPath('manifest'));
		} else {
			$pathname = 'extension_root';
			$path['dest']  = $this->getPath($pathname).DS.basename($this->getPath('manifest'));
		}
		return $this->copyFiles(array ($path), true);
	}

	/**
	 * Tries to find the package manifest file
	 *
	 * @access private
	 * @return boolean True on success, False on error
	 * @since 1.0
	 */
	function _findManifest()
	{
		// Get an array of all the xml files from teh installation directory
		$xmlfiles = JFolder::files($this->getPath('source'), '.xml$', 1, true);
		// If at least one xml file exists
		if (!empty($xmlfiles)) {
			foreach ($xmlfiles as $file)
			{
				// Is it a valid joomla installation manifest file?
				$manifest = $this->_isManifest($file);
				if (!is_null($manifest)) {

					// If the root method attribute is set to upgrade, allow file overwrite
					$root =& $manifest->document;
					if ($root->attributes('method') == 'upgrade') {
						$this->_overwrite = true;
					}

					// Set the manifest object and path
					$this->_manifest =& $manifest;
					$this->setPath('manifest', $file);

					// Set the installation source path to that of the manifest file
					$this->setPath('source', dirname($file));
					return true;
				}
			}

			// None of the xml files found were valid install files
			JError::raiseWarning(1, 'JInstaller::install: '.JText::_('ERRORNOTFINDJOOMLAXMLSETUPFILE'));
			return false;
		} else {
			// No xml files were found in the install folder
			JError::raiseWarning(1, 'JInstaller::install: '.JText::_('ERRORXMLSETUP'));
			return false;
		}
	}

	/**
	 * Is the xml file a valid Joomla installation manifest file
	 *
	 * @access	private
	 * @param	string	$file	An xmlfile path to check
	 * @return	mixed	A JSimpleXML document, or null if the file failed to parse
	 * @since	1.5
	 */
	function &_isManifest($file)
	{
		// Initialize variables
		$null	= null;
		$xml	=& JFactory::getXMLParser('Simple');

		// If we cannot load the xml file return null
		if (!$xml->loadFile($file)) {
			// Free up xml parser memory and return null
			unset ($xml);
			return $null;
		}

		/*
		 * Check for a valid XML root tag.
		 * @todo: Remove backwards compatability in a future version
		 * Should be 'install', but for backward compatability we will accept 'mosinstall'.
		 */
		$root =& $xml->document;
		if (!is_object($root) || ($root->name() != 'install' && $root->name() != 'mosinstall')) {
			// Free up xml parser memory and return null
			unset ($xml);
			return $null;
		}

		// Valid manifest file return the object
		return $xml;
	}
}