component.php

<?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.folder');

/**
 * Component installer
 *
 * @since  3.1
 */
class JInstallerAdapterComponent extends JInstallerAdapter
{
	/**
	 * The list of current files fo the Joomla! CMS administrator that are installed and is read
	 * from the manifest on disk in the update area to handle doing a diff
	 * and deleting files that are in the old files list and not in the new
	 * files list.
	 *
	 * @var    array
	 * @since  3.1
	 * */
	protected $oldAdminFiles = null;

	/**
	 * The list of current files that are installed and is read
	 * from the manifest on disk in the update area to handle doing a diff
	 * and deleting files that are in the old files list and not in the new
	 * files list.
	 *
	 * @var    array
	 * @since  3.1
	 * */
	protected $oldFiles = null;

	/**
	 * A path to the PHP file that the scriptfile declaration in
	 * the manifest refers to.
	 *
	 * @var    string
	 * @since  3.1
	 * */
	protected $manifest_script = null;

	/**
	 * For legacy installations this is a path to the PHP file that the scriptfile declaration in the
	 * manifest refers to.
	 *
	 * @var    string
	 * @since  3.1
	 * */
	protected $install_script = null;

	/**
	 * Method to check if the extension is present in the filesystem
	 *
	 * @return  boolean
	 *
	 * @since   3.4
	 * @throws  RuntimeException
	 */
	protected function checkExtensionInFilesystem()
	{
		/*
		 * If the component site or admin directory already exists, then we will assume that the component is already
		 * installed or another component is using that directory.
		 */
		if (file_exists($this->parent->getPath('extension_site')) || file_exists($this->parent->getPath('extension_administrator')))
		{
			// Look for an update function or update tag
			$updateElement = $this->getManifest()->update;

			// Upgrade manually set or update function available or update tag detected
			if ($this->parent->isUpgrade() || ($this->parent->manifestClass && method_exists($this->parent->manifestClass, 'update'))
				|| $updateElement)
			{
				// If there is a matching extension mark this as an update
				$this->setRoute('update');
			}
			elseif (!$this->parent->isOverwrite())
			{
				// We didn't have overwrite set, find an update function or find an update tag so lets call it safe
				if (file_exists($this->parent->getPath('extension_site')))
				{
					// If the site exists say so.
					throw new RuntimeException(
						JText::sprintf(
							'JLIB_INSTALLER_ERROR_COMP_INSTALL_DIR_SITE',
							$this->parent->getPath('extension_site')
						)
					);
				}

				// If the admin exists say so
				throw new RuntimeException(
					JText::sprintf(
						'JLIB_INSTALLER_ERROR_COMP_INSTALL_DIR_ADMIN',
						$this->parent->getPath('extension_administrator')
					)
				);
			}
		}

		return false;
	}

	/**
	 * Method to copy the extension's base files from the `<files>` tag(s) and the manifest file
	 *
	 * @return  void
	 *
	 * @since   3.4
	 * @throws  RuntimeException
	 */
	protected function copyBaseFiles()
	{
		// Copy site files
		if ($this->getManifest()->files)
		{
			if ($this->route == 'update')
			{
				$result = $this->parent->parseFiles($this->getManifest()->files, 0, $this->oldFiles);
			}
			else
			{
				$result = $this->parent->parseFiles($this->getManifest()->files);
			}

			if ($result === false)
			{
				throw new RuntimeException(
					JText::sprintf(
						'JLIB_INSTALLER_ABORT_COMP_FAIL_SITE_FILES',
						JText::_('JLIB_INSTALLER_' . strtoupper($this->route))
					)
				);
			}
		}

		// Copy admin files
		if ($this->getManifest()->administration->files)
		{
			if ($this->route == 'update')
			{
				$result = $this->parent->parseFiles($this->getManifest()->administration->files, 1, $this->oldAdminFiles);
			}
			else
			{
				$result = $this->parent->parseFiles($this->getManifest()->administration->files, 1);
			}

			if ($result === false)
			{
				throw new RuntimeException(
					JText::sprintf(
						'JLIB_INSTALLER_ABORT_COMP_FAIL_ADMIN_FILES',
						JText::_('JLIB_INSTALLER_' . strtoupper($this->route))
					)
				);
			}
		}

		// If there is a manifest script, let's copy it.
		if ($this->manifest_script)
		{
			$path['src']  = $this->parent->getPath('source') . '/' . $this->manifest_script;
			$path['dest'] = $this->parent->getPath('extension_administrator') . '/' . $this->manifest_script;

			if (!file_exists($path['dest']) || $this->parent->isOverwrite())
			{
				if (!$this->parent->copyFiles(array($path)))
				{
					throw new RuntimeException(
						JText::sprintf(
							'JLIB_INSTALLER_ABORT_COMP_COPY_MANIFEST',
							JText::_('JLIB_INSTALLER_' . strtoupper($this->route))
						)
					);
				}
			}
		}
	}

	/**
	 * Method to create the extension root path if necessary
	 *
	 * @return  void
	 *
	 * @since   3.4
	 * @throws  RuntimeException
	 */
	protected function createExtensionRoot()
	{
		// If the component directory does not exist, let's create it
		$created = false;

		if (!file_exists($this->parent->getPath('extension_site')))
		{
			if (!$created = JFolder::create($this->parent->getPath('extension_site')))
			{
				throw new RuntimeException(
					JText::sprintf(
						'JLIB_INSTALLER_ERROR_COMP_FAILED_TO_CREATE_DIRECTORY',
						JText::_('JLIB_INSTALLER_' . strtoupper($this->route)),
						$this->parent->getPath('extension_site')
					)
				);
			}
		}

		/*
		 * Since we created the component directory and we will want to remove it if we have to roll back
		 * the installation, let's add it to the installation step stack
		 */
		if ($created)
		{
			$this->parent->pushStep(
				array(
					'type' => 'folder',
					'path' => $this->parent->getPath('extension_site'),
				)
			);
		}

		// If the component admin directory does not exist, let's create it
		$created = false;

		if (!file_exists($this->parent->getPath('extension_administrator')))
		{
			if (!$created = JFolder::create($this->parent->getPath('extension_administrator')))
			{
				throw new RuntimeException(
					JText::sprintf(
						'JLIB_INSTALLER_ERROR_COMP_FAILED_TO_CREATE_DIRECTORY',
						JText::_('JLIB_INSTALLER_' . strtoupper($this->route)),
						$this->parent->getPath('extension_site')
					)
				);
			}
		}

		/*
		 * Since we created the component admin directory and we will want to remove it if we have to roll
		 * back the installation, let's add it to the installation step stack
		 */
		if ($created)
		{
			$this->parent->pushStep(
				array(
					'type' => 'folder',
					'path' => $this->parent->getPath('extension_administrator'),
				)
			);
		}
	}

	/**
	 * Method to finalise the installation processing
	 *
	 * @return  void
	 *
	 * @since   3.4
	 * @throws  RuntimeException
	 */
	protected function finaliseInstall()
	{
		/** @var JTableUpdate $update */
		$update = JTable::getInstance('update');

		// Clobber any possible pending updates
		$uid = $update->find(
			array(
				'element'   => $this->element,
				'type'      => $this->extension->type,
				'client_id' => 1,
			)
		);

		if ($uid)
		{
			$update->delete($uid);
		}

		// We will copy the manifest file to its appropriate place.
		if ($this->route != 'discover_install')
		{
			if (!$this->parent->copyManifest())
			{
				// Install failed, roll back changes
				throw new RuntimeException(
					JText::sprintf(
						'JLIB_INSTALLER_ABORT_COMP_COPY_SETUP',
						JText::_('JLIB_INSTALLER_' . strtoupper($this->route))
					)
				);
			}
		}

		// Time to build the admin menus
		if (!$this->_buildAdminMenus($this->extension->extension_id))
		{
			JLog::add(JText::_('JLIB_INSTALLER_ABORT_COMP_BUILDADMINMENUS_FAILED'), JLog::WARNING, 'jerror');
		}

		// Make sure that menu items pointing to the component have correct component id assigned to them.
		// Prevents message "Component 'com_extension' does not exist." after uninstalling / re-installing component.
		if (!$this->_updateSiteMenus($this->extension->extension_id))
		{
			JLog::add(JText::_('JLIB_INSTALLER_ABORT_COMP_UPDATESITEMENUS_FAILED'), JLog::WARNING, 'jerror');
		}

		/** @var JTableAsset $asset */
		$asset = JTable::getInstance('Asset');

		// Check if an asset already exists for this extension and create it if not
		if (!$asset->loadByName($this->extension->element))
		{
			// Register the component container just under root in the assets table.
			$asset->name      = $this->extension->element;
			$asset->parent_id = 1;
			$asset->rules     = '{}';
			$asset->title     = $this->extension->name;
			$asset->setLocation(1, 'last-child');

			if (!$asset->store())
			{
				// Install failed, roll back changes
				throw new RuntimeException(
					JText::sprintf(
						'JLIB_INSTALLER_ABORT_ROLLBACK',
						JText::_('JLIB_INSTALLER_' . strtoupper($this->route)),
						$this->extension->getError()
					)
				);
			}
		}
	}

	/**
	 * Get the filtered extension element from the manifest
	 *
	 * @param   string  $element  Optional element name to be converted
	 *
	 * @return  string  The filtered element
	 *
	 * @since   3.4
	 */
	public function getElement($element = null)
	{
		$element = parent::getElement($element);

		if (substr($element, 0, 4) != 'com_')
		{
			$element = 'com_' . $element;
		}

		return $element;
	}

	/**
	 * Custom loadLanguage method
	 *
	 * @param   string  $path  The path language files are on.
	 *
	 * @return  void
	 *
	 * @since   3.1
	 */
	public function loadLanguage($path = null)
	{
		$source = $this->parent->getPath('source');
		$client = $this->parent->extension->client_id ? JPATH_ADMINISTRATOR : JPATH_SITE;

		if (!$source)
		{
			$this->parent->setPath('source', $client . '/components/' . $this->parent->extension->element);
		}

		$extension = $this->getElement();
		$source    = $path ? $path : $client . '/components/' . $extension;

		if ($this->getManifest()->administration->files)
		{
			$element = $this->getManifest()->administration->files;
		}
		elseif ($this->getManifest()->files)
		{
			$element = $this->getManifest()->files;
		}
		else
		{
			$element = null;
		}

		if ($element)
		{
			$folder = (string) $element->attributes()->folder;

			if ($folder && file_exists($path . '/' . $folder))
			{
				$source = $path . '/' . $folder;
			}
		}

		$this->doLoadLanguage($extension, $source);
	}

	/**
	 * Method to parse optional tags in the manifest
	 *
	 * @return  void
	 *
	 * @since   3.4
	 */
	protected function parseOptionalTags()
	{
		// Parse optional tags
		$this->parent->parseMedia($this->getManifest()->media);
		$this->parent->parseLanguages($this->getManifest()->languages);
		$this->parent->parseLanguages($this->getManifest()->administration->languages, 1);
	}

	/**
	 * Prepares the adapter for a discover_install task
	 *
	 * @return  void
	 *
	 * @since   3.4
	 * @throws  RuntimeException
	 */
	public function prepareDiscoverInstall()
	{
		// Need to find to find where the XML file is since we don't store this normally
		$client = JApplicationHelper::getClientInfo($this->extension->client_id);
		$short_element = str_replace('com_', '', $this->extension->element);
		$manifestPath = $client->path . '/components/' . $this->extension->element . '/' . $short_element . '.xml';
		$this->parent->manifest = $this->parent->isManifest($manifestPath);
		$this->parent->setPath('manifest', $manifestPath);
		$this->parent->setPath('source', $client->path . '/components/' . $this->extension->element);
		$this->parent->setPath('extension_root', $this->parent->getPath('source'));
		$this->setManifest($this->parent->getManifest());

		$manifest_details = JInstaller::parseXMLInstallFile($this->parent->getPath('manifest'));
		$this->extension->manifest_cache = json_encode($manifest_details);
		$this->extension->state = 0;
		$this->extension->name = $manifest_details['name'];
		$this->extension->enabled = 1;
		$this->extension->params = $this->parent->getParams();

		$stored = false;

		try
		{
			$this->extension->store();
			$stored = true;
		}
		catch (RuntimeException $e)
		{
			// Try to delete existing failed records before retrying
			$db = $this->db;

			$query = $db->getQuery(true)
				->select($db->qn('extension_id'))
				->from($db->qn('#__extensions'))
				->where($db->qn('name') . ' = ' . $db->q($this->extension->name))
				->where($db->qn('type') . ' = ' . $db->q($this->extension->type))
				->where($db->qn('element') . ' = ' . $db->q($this->extension->element));

			$db->setQuery($query);

			$extension_ids = $db->loadColumn();

			if (!empty($extension_ids))
			{
				foreach ($extension_ids as $eid)
				{
					// Remove leftover admin menus for this extension ID
					$this->_removeAdminMenus($eid);

					// Remove the extension record itself
					/** @var JTableExtension $extensionTable */
					$extensionTable = JTable::getInstance('extension');
					$extensionTable->delete($eid);
				}
			}
		}

		if (!$stored)
		{
			try
			{
				$this->extension->store();
			}
			catch (RuntimeException $e)
			{
				throw new RuntimeException(JText::_('JLIB_INSTALLER_ERROR_COMP_DISCOVER_STORE_DETAILS'), $e->getCode(), $e);
			}
		}
	}

	/**
	 * Method to do any prechecks and setup the install paths for the extension
	 *
	 * @return  void
	 *
	 * @since   3.4
	 * @throws  RuntimeException
	 */
	protected function setupInstallPaths()
	{
		// Set the installation target paths
		$this->parent->setPath('extension_site', JPath::clean(JPATH_SITE . '/components/' . $this->element));
		$this->parent->setPath('extension_administrator', JPath::clean(JPATH_ADMINISTRATOR . '/components/' . $this->element));

		// Copy the admin path as it's used as a common base
		$this->parent->setPath('extension_root', $this->parent->getPath('extension_administrator'));

		// Make sure that we have an admin element
		if (!$this->getManifest()->administration)
		{
			throw new RuntimeException(JText::_('JLIB_INSTALLER_ERROR_COMP_INSTALL_ADMIN_ELEMENT'));
		}
	}

	/**
	 * Method to setup the update routine for the adapter
	 *
	 * @return  void
	 *
	 * @since   3.4
	 */
	protected function setupUpdates()
	{
		// Hunt for the original XML file
		$old_manifest = null;

		// Use a temporary instance due to side effects; start in the administrator first
		$tmpInstaller = new JInstaller;
		$tmpInstaller->setPath('source', $this->parent->getPath('extension_administrator'));

		if (!$tmpInstaller->findManifest())
		{
			// Then the site
			$tmpInstaller->setPath('source', $this->parent->getPath('extension_site'));

			if ($tmpInstaller->findManifest())
			{
				$old_manifest = $tmpInstaller->getManifest();
			}
		}
		else
		{
			$old_manifest = $tmpInstaller->getManifest();
		}

		if ($old_manifest)
		{
			$this->oldAdminFiles = $old_manifest->administration->files;
			$this->oldFiles = $old_manifest->files;
		}
	}

	/**
	 * Method to store the extension to the database
	 *
	 * @param   bool  $deleteExisting  Should I try to delete existing records of the same component?
	 *
	 * @return  void
	 *
	 * @since   3.4
	 * @throws  RuntimeException
	 */
	protected function storeExtension($deleteExisting = false)
	{
		// The extension is stored during prepareDiscoverInstall for discover installs
		if ($this->route == 'discover_install')
		{
			return;
		}

		// Add or update an entry to the extension table
		$this->extension->name    = $this->name;
		$this->extension->type    = 'component';
		$this->extension->element = $this->element;

		// If we are told to delete existing extension entries then do so.
		if ($deleteExisting)
		{
			$db = $this->parent->getDbo();

			$query = $db->getQuery(true)
						->select($db->qn('extension_id'))
						->from($db->qn('#__extensions'))
						->where($db->qn('name') . ' = ' . $db->q($this->extension->name))
						->where($db->qn('type') . ' = ' . $db->q($this->extension->type))
						->where($db->qn('element') . ' = ' . $db->q($this->extension->element));

			$db->setQuery($query);

			$extension_ids = $db->loadColumn();

			if (!empty($extension_ids))
			{
				foreach ($extension_ids as $eid)
				{
					// Remove leftover admin menus for this extension ID
					$this->_removeAdminMenus($eid);

					// Remove the extension record itself
					/** @var JTableExtension $extensionTable */
					$extensionTable = JTable::getInstance('extension');
					$extensionTable->delete($eid);
				}
			}
		}

		// If there is not already a row, generate a heap of defaults
		if (!$this->currentExtensionId)
		{
			$this->extension->folder    = '';
			$this->extension->enabled   = 1;
			$this->extension->protected = 0;
			$this->extension->access    = 0;
			$this->extension->client_id = 1;
			$this->extension->params    = $this->parent->getParams();
			$this->extension->custom_data = '';
			$this->extension->system_data = '';
		}

		$this->extension->manifest_cache = $this->parent->generateManifestCache();

		$couldStore = $this->extension->store();

		if (!$couldStore && $deleteExisting)
		{
			// Install failed, roll back changes
			throw new RuntimeException(
				JText::sprintf(
					'JLIB_INSTALLER_ABORT_COMP_INSTALL_ROLLBACK',
					$this->extension->getError()
				)
			);
		}

		if (!$couldStore && !$deleteExisting)
		{
			// Maybe we have a failed installation (e.g. timeout). Let's retry after deleting old records.
			$this->storeExtension(true);
		}
	}

	/**
	 * Custom uninstall method for components
	 *
	 * @param   integer  $id  The unique extension id of the component to uninstall
	 *
	 * @return  boolean  True on success
	 *
	 * @since   3.1
	 */
	public function uninstall($id)
	{
		$db     = $this->db;
		$retval = true;

		// First order of business will be to load the component object table from the database.
		// This should give us the necessary information to proceed.
		if (!$this->extension->load((int) $id))
		{
			JLog::add(JText::_('JLIB_INSTALLER_ERROR_COMP_UNINSTALL_ERRORUNKOWNEXTENSION'), JLog::WARNING, 'jerror');

			return false;
		}

		// Is the component we are trying to uninstall a core one?
		// Because that is not a good idea...
		if ($this->extension->protected)
		{
			JLog::add(JText::_('JLIB_INSTALLER_ERROR_COMP_UNINSTALL_WARNCORECOMPONENT'), JLog::WARNING, 'jerror');

			return false;
		}

		// Get the admin and site paths for the component
		$this->parent->setPath('extension_administrator', JPath::clean(JPATH_ADMINISTRATOR . '/components/' . $this->extension->element));
		$this->parent->setPath('extension_site', JPath::clean(JPATH_SITE . '/components/' . $this->extension->element));

		// Copy the admin path as it's used as a common base
		$this->parent->setPath('extension_root', $this->parent->getPath('extension_administrator'));

		/**
		 * ---------------------------------------------------------------------------------------------
		 * Manifest Document Setup Section
		 * ---------------------------------------------------------------------------------------------
		 */

		// Find and load the XML install file for the component
		$this->parent->setPath('source', $this->parent->getPath('extension_administrator'));

		// Get the package manifest object
		// We do findManifest to avoid problem when uninstalling a list of extension: getManifest cache its manifest file
		$this->parent->findManifest();
		$this->setManifest($this->parent->getManifest());

		if (!$this->getManifest())
		{
			// Make sure we delete the folders if no manifest exists
			JFolder::delete($this->parent->getPath('extension_administrator'));
			JFolder::delete($this->parent->getPath('extension_site'));

			// Remove the menu
			$this->_removeAdminMenus($this->extension->extension_id);

			// Raise a warning
			JLog::add(JText::_('JLIB_INSTALLER_ERROR_COMP_UNINSTALL_ERRORREMOVEMANUALLY'), JLog::WARNING, 'jerror');

			// Return
			return false;
		}

		// Set the extensions name
		$this->set('name', $this->getName());
		$this->set('element', $this->getElement());

		// Attempt to load the admin language file; might have uninstall strings
		$this->loadLanguage(JPATH_ADMINISTRATOR . '/components/' . $this->element);

		/**
		 * ---------------------------------------------------------------------------------------------
		 * Installer Trigger Loading and Uninstall
		 * ---------------------------------------------------------------------------------------------
		 */

		$this->setupScriptfile();

		try
		{
			$this->triggerManifestScript('uninstall');
		}
		catch (RuntimeException $e)
		{
			// Ignore errors for now
		}

		/**
		 * ---------------------------------------------------------------------------------------------
		 * Database Processing Section
		 * ---------------------------------------------------------------------------------------------
		 */

		// Let's run the uninstall queries for the component
		try
		{
			$this->parseQueries();
		}
		catch (RuntimeException $e)
		{
			JLog::add($e->getMessage(), JLog::WARNING, 'jerror');

			$retval = false;
		}

		$this->_removeAdminMenus($this->extension->extension_id);

		/**
		 * ---------------------------------------------------------------------------------------------
		 * Filesystem Processing Section
		 * ---------------------------------------------------------------------------------------------
		 */

		// Let's remove those language files and media in the JROOT/images/ folder that are
		// associated with the component we are uninstalling
		$this->parent->removeFiles($this->getManifest()->media);
		$this->parent->removeFiles($this->getManifest()->languages);
		$this->parent->removeFiles($this->getManifest()->administration->languages, 1);

		// Remove the schema version
		$query = $db->getQuery(true)
					->delete('#__schemas')
					->where('extension_id = ' . $id);
		$db->setQuery($query);
		$db->execute();

		// Remove the component container in the assets table.
		$asset = JTable::getInstance('Asset');

		if ($asset->loadByName($this->element))
		{
			$asset->delete();
		}

		// Remove categories for this component
		$query->clear()
			->delete('#__categories')
			->where('extension=' . $db->quote($this->element), 'OR')
			->where('extension LIKE ' . $db->quote($this->element . '.%'));
		$db->setQuery($query);
		$db->execute();

		// Rebuild the categories for correct lft/rgt
		$category = JTable::getInstance('category');
		$category->rebuild();

		// Clobber any possible pending updates
		$update = JTable::getInstance('update');
		$uid = $update->find(
			array(
				'element'   => $this->extension->element,
				'type'      => 'component',
				'client_id' => 1,
				'folder'    => '',
			)
		);

		if ($uid)
		{
			$update->delete($uid);
		}

		// Now we need to delete the installation directories. This is the final step in uninstalling the component.
		if (trim($this->extension->element))
		{
			// Delete the component site directory
			if (is_dir($this->parent->getPath('extension_site')))
			{
				if (!JFolder::delete($this->parent->getPath('extension_site')))
				{
					JLog::add(JText::_('JLIB_INSTALLER_ERROR_COMP_UNINSTALL_FAILED_REMOVE_DIRECTORY_SITE'), JLog::WARNING, 'jerror');
					$retval = false;
				}
			}

			// Delete the component admin directory
			if (is_dir($this->parent->getPath('extension_administrator')))
			{
				if (!JFolder::delete($this->parent->getPath('extension_administrator')))
				{
					JLog::add(JText::_('JLIB_INSTALLER_ERROR_COMP_UNINSTALL_FAILED_REMOVE_DIRECTORY_ADMIN'), JLog::WARNING, 'jerror');
					$retval = false;
				}
			}

			// Now we will no longer need the extension object, so let's delete it
			$this->extension->delete($this->extension->extension_id);

			return $retval;
		}
		else
		{
			// No component option defined... cannot delete what we don't know about
			JLog::add(JText::_('JLIB_INSTALLER_ERROR_COMP_UNINSTALL_NO_OPTION'), JLog::WARNING, 'jerror');

			return false;
		}
	}

	/**
	 * Method to build menu database entries for a component
	 *
	 * @param   int|null  $component_id  The component ID for which I'm building menus
	 *
	 * @return  boolean  True if successful
	 *
	 * @since   3.1
	 */
	protected function _buildAdminMenus($component_id = null)
	{
		$db     = $this->parent->getDbo();

		$option = $this->get('element');

		// If a component exists with this option in the table then we don't need to add menus
		$query = $db->getQuery(true)
					->select('m.id, e.extension_id')
					->from('#__menu AS m')
					->join('LEFT', '#__extensions AS e ON m.component_id = e.extension_id')
					->where('m.parent_id = 1')
					->where('m.client_id = 1')
					->where('e.element = ' . $db->quote($option));

		$db->setQuery($query);

		// In case of a failed installation (e.g. timeout error) we may have duplicate menu item and extension records.
		$componentrows = $db->loadObjectList();

		// Check if menu items exist
		if (!empty($componentrows))
		{
			// Don't do anything if overwrite has not been enabled
			if (!$this->parent->isOverwrite())
			{
				return true;
			}

			// Remove all menu items
			foreach ($componentrows as $componentrow)
			{
				// Remove existing menu items if overwrite has been enabled
				if ($option)
				{
					// If something goes wrong, there's no way to rollback TODO: Search for better solution
					$this->_removeAdminMenus($componentrow->extension_id);
				}
			}
		}

		// Only try to detect the component ID if it's not provided
		if (empty($component_id))
		{
			// Lets find the extension id
			$query->clear()
				->select('e.extension_id')
				->from('#__extensions AS e')
				->where('e.type = ' . $db->quote('component'))
				->where('e.element = ' . $db->quote($option));

			$db->setQuery($query);
			$component_id = $db->loadResult();
		}

		// Ok, now its time to handle the menus.  Start with the component root menu, then handle submenus.
		$menuElement = $this->getManifest()->administration->menu;

		// Just do not create the menu if $menuElement not exist
		if (!$menuElement)
		{
			return true;
		}

		// If the menu item is hidden do nothing more, just return
		if (in_array((string) $menuElement['hidden'], array('true', 'hidden')))
		{
			return true;
		}

		// Let's figure out what the menu item data should look like
		$data = array();

		if ($menuElement)
		{
			// I have a menu element, use this information
			$data['menutype'] = 'main';
			$data['client_id'] = 1;
			$data['title'] = (string) trim($menuElement);
			$data['alias'] = (string) $menuElement;
			$data['link'] = 'index.php?option=' . $option;
			$data['type'] = 'component';
			$data['published'] = 0;
			$data['parent_id'] = 1;
			$data['component_id'] = $component_id;
			$data['img'] = ((string) $menuElement->attributes()->img) ? (string) $menuElement->attributes()->img : 'class:component';
			$data['home'] = 0;
			$data['path'] = '';
			$data['params'] = '';
		}
		else
		{
			// No menu element was specified, Let's make a generic menu item
			$data = array();
			$data['menutype'] = 'main';
			$data['client_id'] = 1;
			$data['title'] = $option;
			$data['alias'] = $option;
			$data['link'] = 'index.php?option=' . $option;
			$data['type'] = 'component';
			$data['published'] = 0;
			$data['parent_id'] = 1;
			$data['component_id'] = $component_id;
			$data['img'] = 'class:component';
			$data['home'] = 0;
			$data['path'] = '';
			$data['params'] = '';
		}

		// Try to create the menu item in the database
		$parent_id = $this->_createAdminMenuItem($data, 1);

		if ($parent_id === false)
		{
			return false;
		}

		/*
		 * Process SubMenus
		 */

		if (!$this->getManifest()->administration->submenu)
		{
			// No submenu? We're done.
			return true;
		}

		foreach ($this->getManifest()->administration->submenu->menu as $child)
		{
			$data = array();
			$data['menutype'] = 'main';
			$data['client_id'] = 1;
			$data['title'] = (string) trim($child);
			$data['alias'] = (string) $child;
			$data['type'] = 'component';
			$data['published'] = 0;
			$data['parent_id'] = $parent_id;
			$data['component_id'] = $component_id;
			$data['img'] = ((string) $child->attributes()->img) ? (string) $child->attributes()->img : 'class:component';
			$data['home'] = 0;

			// Set the sub menu link
			if ((string) $child->attributes()->link)
			{
				$data['link'] = 'index.php?' . $child->attributes()->link;
			}
			else
			{
				$request = array();

				if ((string) $child->attributes()->act)
				{
					$request[] = 'act=' . $child->attributes()->act;
				}

				if ((string) $child->attributes()->task)
				{
					$request[] = 'task=' . $child->attributes()->task;
				}

				if ((string) $child->attributes()->controller)
				{
					$request[] = 'controller=' . $child->attributes()->controller;
				}

				if ((string) $child->attributes()->view)
				{
					$request[] = 'view=' . $child->attributes()->view;
				}

				if ((string) $child->attributes()->layout)
				{
					$request[] = 'layout=' . $child->attributes()->layout;
				}

				if ((string) $child->attributes()->sub)
				{
					$request[] = 'sub=' . $child->attributes()->sub;
				}

				$qstring = (count($request)) ? '&' . implode('&', $request) : '';
				$data['link'] = 'index.php?option=' . $option . $qstring;
			}

			$submenuId = $this->_createAdminMenuItem($data, $parent_id);

			if ($submenuId === false)
			{
				return false;
			}

			/*
			 * Since we have created a menu item, we add it to the installation step stack
			 * so that if we have to rollback the changes we can undo it.
			 */
			$this->parent->pushStep(array('type' => 'menu', 'id' => $component_id));
		}

		return true;
	}

	/**
	 * Method to remove admin menu references to a component
	 *
	 * @param   int  $id  The ID of the extension whose admin menus will be removed
	 *
	 * @return  boolean  True if successful.
	 *
	 * @since   3.1
	 */
	protected function _removeAdminMenus($id)
	{
		$db = $this->parent->getDbo();

		/** @var  JTableMenu  $table */
		$table = JTable::getInstance('menu');

		// Get the ids of the menu items
		$query = $db->getQuery(true)
					->select('id')
					->from('#__menu')
					->where($db->quoteName('client_id') . ' = 1')
					->where($db->quoteName('component_id') . ' = ' . (int) $id);

		$db->setQuery($query);

		$ids = $db->loadColumn();

		$result = true;

		// Check for error
		if (!empty($ids))
		{
			// Iterate the items to delete each one.
			foreach ($ids as $menuid)
			{
				if (!$table->delete((int) $menuid))
				{
					$this->setError($table->getError());

					$result = false;
				}
			}

			// Rebuild the whole tree
			$table->rebuild();
		}

		return $result;
	}

	/**
	 * Method to update menu database entries for a component in case if the component has been uninstalled before.
	 *
	 * @param   int|null  $component_id  The component ID.
	 *
	 * @return  boolean  True if successful
	 *
	 * @since   3.4.2
	 */
	protected function _updateSiteMenus($component_id = null)
	{
		$db     = $this->parent->getDbo();
		$option = $this->get('element');

		// Update all menu items which contain 'index.php?option=com_extension' or 'index.php?option=com_extension&...'
		// to use the new component id.
		$query = $db->getQuery(true)
					->update('#__menu')
					->set('component_id = ' . $db->quote($component_id))
					->where("type = " . $db->quote('component'))
					->where('client_id = 0')
					->where('link LIKE ' . $db->quote('index.php?option=' . $option)
							. " OR link LIKE '" . $db->escape('index.php?option=' . $option . '&') . "%'");

		$db->setQuery($query);

		try
		{
			$db->execute();
		}
		catch (RuntimeException $e)
		{
			return false;
		}

		return true;
	}

	/**
	 * Custom rollback method
	 * - Roll back the component menu item
	 *
	 * @param   array  $step  Installation step to rollback.
	 *
	 * @return  boolean  True on success
	 *
	 * @since   3.1
	 */
	protected function _rollback_menu($step)
	{
		return $this->_removeAdminMenus($step['id']);
	}

	/**
	 * Discover unregistered extensions.
	 *
	 * @return  array  A list of extensions.
	 *
	 * @since   3.1
	 */
	public function discover()
	{
		$results = array();
		$site_components = JFolder::folders(JPATH_SITE . '/components');
		$admin_components = JFolder::folders(JPATH_ADMINISTRATOR . '/components');

		foreach ($site_components as $component)
		{
			if (file_exists(JPATH_SITE . '/components/' . $component . '/' . str_replace('com_', '', $component) . '.xml'))
			{
				$manifest_details = JInstaller::parseXMLInstallFile(
					JPATH_SITE . '/components/' . $component . '/' . str_replace('com_', '', $component) . '.xml'
				);
				$extension = JTable::getInstance('extension');
				$extension->set('type', 'component');
				$extension->set('client_id', 0);
				$extension->set('element', $component);
				$extension->set('folder', '');
				$extension->set('name', $component);
				$extension->set('state', -1);
				$extension->set('manifest_cache', json_encode($manifest_details));
				$extension->set('params', '{}');
				$results[] = $extension;
			}
		}

		foreach ($admin_components as $component)
		{
			if (file_exists(JPATH_ADMINISTRATOR . '/components/' . $component . '/' . str_replace('com_', '', $component) . '.xml'))
			{
				$manifest_details = JInstaller::parseXMLInstallFile(
					JPATH_ADMINISTRATOR . '/components/' . $component . '/' . str_replace('com_', '', $component) . '.xml'
				);
				$extension = JTable::getInstance('extension');
				$extension->set('type', 'component');
				$extension->set('client_id', 1);
				$extension->set('element', $component);
				$extension->set('folder', '');
				$extension->set('name', $component);
				$extension->set('state', -1);
				$extension->set('manifest_cache', json_encode($manifest_details));
				$extension->set('params', '{}');
				$results[] = $extension;
			}
		}

		return $results;
	}

	/**
	 * Refreshes the extension table cache
	 *
	 * @return  boolean  Result of operation, true if updated, false on failure
	 *
	 * @since   3.1
	 */
	public function refreshManifestCache()
	{
		// Need to find to find where the XML file is since we don't store this normally
		$client = JApplicationHelper::getClientInfo($this->parent->extension->client_id);
		$short_element = str_replace('com_', '', $this->parent->extension->element);
		$manifestPath = $client->path . '/components/' . $this->parent->extension->element . '/' . $short_element . '.xml';
		$this->parent->manifest = $this->parent->isManifest($manifestPath);
		$this->parent->setPath('manifest', $manifestPath);

		$manifest_details = JInstaller::parseXMLInstallFile($this->parent->getPath('manifest'));
		$this->parent->extension->manifest_cache = json_encode($manifest_details);
		$this->parent->extension->name = $manifest_details['name'];

		try
		{
			return $this->parent->extension->store();
		}
		catch (RuntimeException $e)
		{
			JLog::add(JText::_('JLIB_INSTALLER_ERROR_COMP_REFRESH_MANIFEST_CACHE'), JLog::WARNING, 'jerror');

			return false;
		}
	}

	/**
	 * Creates the menu item in the database. If the item already exists it tries to remove it and create it afresh.
	 *
	 * @param   array    &$data     The menu item data to create
	 * @param   integer  $parentId  The parent menu item ID
	 *
	 * @return  bool|int  Menu item ID on success, false on failure
	 */
	protected function _createAdminMenuItem(array &$data, $parentId)
	{
		$db = $this->parent->getDbo();

		/** @var  JTableMenu  $table */
		$table  = JTable::getInstance('menu');

		try
		{
			$table->setLocation($parentId, 'last-child');
		}
		catch (InvalidArgumentException $e)
		{
			JLog::add($e->getMessage(), JLog::WARNING, 'jerror');

			return false;
		}

		if (!$table->bind($data) || !$table->check() || !$table->store())
		{
			// The menu item already exists. Delete it and retry instead of throwing an error.
			$query = $db->getQuery(true)
						->select('id')
						->from('#__menu')
						->where('menutype = ' . $db->q($data['menutype']))
						->where('client_id = 1')
						->where('link = ' . $db->q($data['link']))
						->where('type = ' . $db->q($data['type']))
						->where('parent_id = ' . $db->q($data['parent_id']))
						->where('home = ' . $db->q($data['home']));

			$db->setQuery($query);
			$menu_id = $db->loadResult();

			if (!$menu_id)
			{
				// Oops! Could not get the menu ID. Go back and rollback changes.
				JError::raiseWarning(1, $table->getError());

				return false;
			}
			else
			{
				/** @var  JTableMenu $temporaryTable */
				$temporaryTable = JTable::getInstance('menu');
				$temporaryTable->delete($menu_id, true);
				$temporaryTable->rebuild($data['parent_id']);

				// Retry creating the menu item
				$table->setLocation($parentId, 'last-child');

				if (!$table->bind($data) || !$table->check() || !$table->store())
				{
					// Install failed, warn user and rollback changes
					JError::raiseWarning(1, $table->getError());

					return false;
				}
			}
		}

		return $table->id;
	}
}

/**
 * Deprecated class placeholder. You should use JInstallerAdapterComponent instead.
 *
 * @since       3.1
 * @deprecated  4.0
 * @codeCoverageIgnore
 */
class JInstallerComponent extends JInstallerAdapterComponent
{
}