Function to check Joomla! components. Easily extendable with more custom checks & transformable to check any joomla extension

milibrary.php

<?php 
	/**
	 *
	 * @author Roberto Segura - Digital Disseny, S.L.
	 * @version 02/07/2012
	 *
	 * @param string $comString
	 * @param string $validationType:<br>
	 *     100 => 1st char = validate db?<br>
	 *     010 => 2nd char = validate backend folder?<br>
	 *     001 => 3rd char = validate frontend folder?<br>
	 *     111 => validate all example<br>
	 */
	public function validateComponent($comString, $validationType = 100){
	    jimport('joomla.filesystem.folder');
	    // default result
	    $validComponent = false;
	    $validationsDone = 0;
	    // use allways as string
	    $validationType = (string)$validationType;
        // get required validations
	    $validateDb = (isset($validationType[0]) && $validationType[0] == '1');
	    $validateBackend = (isset($validationType[1]) && $validationType[1] == '1');
	    $validateFrontend = (isset($validationType[2]) && $validationType[2] == '1');
	    // validate: extension is present and enabled on db
	    if (($validationsDone == 0 || ($validComponent)) && $validateDb) {
	        $db = JFactory::getDbo();
	        $query = $db->getQuery(true);
	        $query->select('extension_id, name');
	        $query->from('#__extensions');
	        $query->where('element='.$db->quote($comString));
	        $db->setQuery($query);
	        if($db->loadObject()) {
	            $validComponent =  true;
	        } else {
	            $validComponent =  false;
	        }
	        $validationsDone++;
	    }
	    // validate: backend folder exist
	    if (($validationsDone == 0 || ($validComponent)) && $validateBackend) {
	        $backendPath = JPATH_ADMINISTRATOR
	                        . DIRECTORY_SEPARATOR .'components'
	                        . DIRECTORY_SEPARATOR . $comString ;
	        if (JFolder::exists($backendPath)) {
	            $validComponent = true;
	        } else {
	            $validComponent = false;
	        }
	        $validationsDone++;
	    }
	    // validate: frontend folder exist
	    if (($validationsDone == 0 || ($validComponent)) && $validateFrontend) {
	        $frontendPath = JPATH_SITE
	                        . DIRECTORY_SEPARATOR .'components'
	                        . DIRECTORY_SEPARATOR . $comString;
	        if (JFolder::exists($frontendPath)) {
	            $validComponent = true;
	        } else {
	            $validComponent = false;
	        }
	        $validationsDone++;
	    }
	    return $validComponent;
	}