<?php
// No direct access to this file
defined('_JEXEC') or die('Restricted access');

// import Joomla modelform library
jimport('joomla.application.component.modeladmin');

/**
 * HelloWorld Model
 */
class HelloWorldModelHelloWorld extends JModelAdmin
{

        /**
     * Constructor that creates a connection to the database
     *
     * @return void
     */
        public function __construct(){
        parent::__construct();

                JLoader::register('HelloWorldHelperDatabase', JPATH_COMPONENT.'/helpers/mysql_database.php');
                $this->_db = HelloWorldHelperDatabase::getDatabase();

                var_dump($this->_db);
                if ( JError::isError($this->_db) ) {
                    jexit('Database Error: ' . $s->toString() );
                }

                if ($this->_db->getErrorNum() > 0) {
                        JError::raiseError(500, 'JDatabase::getInstance: Could not connect to database <br/>');
                }

        }

        /**
     * Returns a reference to the a Table object, always creating it.
     *
     * @param   type    The table type to instantiate
     * @param   string  A prefix for the table class name. Optional.
     * @param   array   Configuration array for model. Optional.
     * @return  JTable  A database object
     * @since   1.6
     */
    public function getTable($type = 'HelloWorld', $prefix = 'HelloWorldTable', $config = array())
    {
        return JTable::getInstance($type, $prefix, $config);
    }

    /**
     * Method to get the record form.
     *
     * @param   array   $data       Data for the form.
     * @param   boolean $loadData   True if the form is to load its own data (default case), false if not.
     * @return  mixed   A JForm object on success, false on failure
     * @since   1.6
     */
    public function getForm($data = array(), $loadData = true)
    {
        // Get the form.
        $form = $this->loadForm('com_helloworld.helloworld', 'helloworld', array('control' => 'jform', 'load_data' => $loadData));
        if (empty($form))
        {
            return false;
        }
        return $form;
    }

    /**
     * Method to get the data that should be injected in the form.
     *
     * @return  mixed   The data for the form.
     * @since   1.6
     */
    protected function loadFormData()
    {
        // Check the session for previously entered form data.
        $data = JFactory::getApplication()->getUserState('com_helloworld.edit.helloworld.data', array());

        if (empty($data))
        {
            $data = $this->getItem();
        }

        return $data;
    }
}