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libraries/legacy/model/form.php
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325
libraries/legacy/model/form.php
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<?php
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/**
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* @package Joomla.Legacy
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* @subpackage Model
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*
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* @copyright Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
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* @license GNU General Public License version 2 or later; see LICENSE
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*/
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defined('JPATH_PLATFORM') or die;
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/**
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* Prototype form model.
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*
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* @package Joomla.Legacy
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* @subpackage Model
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* @see JForm
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* @see JFormField
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* @see JFormRule
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* @since 12.2
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*/
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abstract class JModelForm extends JModelLegacy
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{
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/**
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* Array of form objects.
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*
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* @var array
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* @since 12.2
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*/
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protected $_forms = array();
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/**
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* Method to checkin a row.
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*
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* @param integer $pk The numeric id of the primary key.
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*
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* @return boolean False on failure or error, true otherwise.
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*
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* @since 12.2
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*/
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public function checkin($pk = null)
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{
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// Only attempt to check the row in if it exists.
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if ($pk)
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{
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$user = JFactory::getUser();
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// Get an instance of the row to checkin.
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$table = $this->getTable();
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if (!$table->load($pk))
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{
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$this->setError($table->getError());
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return false;
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}
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// Check if this is the user having previously checked out the row.
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if ($table->checked_out > 0 && $table->checked_out != $user->get('id') && !$user->authorise('core.admin', 'com_checkin'))
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{
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$this->setError(JText::_('JLIB_APPLICATION_ERROR_CHECKIN_USER_MISMATCH'));
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return false;
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}
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// Attempt to check the row in.
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if (!$table->checkin($pk))
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{
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$this->setError($table->getError());
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return false;
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}
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}
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return true;
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}
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/**
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* Method to check-out a row for editing.
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*
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* @param integer $pk The numeric id of the primary key.
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*
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* @return boolean False on failure or error, true otherwise.
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*
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* @since 12.2
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*/
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public function checkout($pk = null)
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{
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// Only attempt to check the row in if it exists.
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if ($pk)
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{
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// Get an instance of the row to checkout.
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$table = $this->getTable();
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if (!$table->load($pk))
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{
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$this->setError($table->getError());
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return false;
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}
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// If there is no checked_out or checked_out_time field, just return true.
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if (!property_exists($table, 'checked_out') || !property_exists($table, 'checked_out_time'))
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{
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return true;
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}
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$user = JFactory::getUser();
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// Check if this is the user having previously checked out the row.
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if ($table->checked_out > 0 && $table->checked_out != $user->get('id'))
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{
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$this->setError(JText::_('JLIB_APPLICATION_ERROR_CHECKOUT_USER_MISMATCH'));
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return false;
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}
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// Attempt to check the row out.
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if (!$table->checkout($user->get('id'), $pk))
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{
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$this->setError($table->getError());
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return false;
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}
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}
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return true;
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}
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/**
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* Abstract method for getting the form from the model.
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*
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* @param array $data Data for the form.
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* @param boolean $loadData True if the form is to load its own data (default case), false if not.
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*
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* @return mixed A JForm object on success, false on failure
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*
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* @since 12.2
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*/
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abstract public function getForm($data = array(), $loadData = true);
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/**
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* Method to get a form object.
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*
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* @param string $name The name of the form.
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* @param string $source The form source. Can be XML string if file flag is set to false.
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* @param array $options Optional array of options for the form creation.
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* @param boolean $clear Optional argument to force load a new form.
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* @param string $xpath An optional xpath to search for the fields.
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*
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* @return mixed JForm object on success, False on error.
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*
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* @see JForm
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* @since 12.2
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*/
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protected function loadForm($name, $source = null, $options = array(), $clear = false, $xpath = false)
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{
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// Handle the optional arguments.
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$options['control'] = JArrayHelper::getValue($options, 'control', false);
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// Create a signature hash.
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$hash = md5($source . serialize($options));
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// Check if we can use a previously loaded form.
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if (isset($this->_forms[$hash]) && !$clear)
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{
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return $this->_forms[$hash];
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}
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// Get the form.
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JForm::addFormPath(JPATH_COMPONENT . '/models/forms');
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JForm::addFieldPath(JPATH_COMPONENT . '/models/fields');
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JForm::addFormPath(JPATH_COMPONENT . '/model/form');
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JForm::addFieldPath(JPATH_COMPONENT . '/model/field');
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try
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{
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$form = JForm::getInstance($name, $source, $options, false, $xpath);
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if (isset($options['load_data']) && $options['load_data'])
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{
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// Get the data for the form.
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$data = $this->loadFormData();
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}
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else
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{
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$data = array();
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}
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// Allow for additional modification of the form, and events to be triggered.
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// We pass the data because plugins may require it.
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$this->preprocessForm($form, $data);
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// Load the data into the form after the plugins have operated.
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$form->bind($data);
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}
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catch (Exception $e)
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{
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$this->setError($e->getMessage());
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return false;
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}
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// Store the form for later.
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$this->_forms[$hash] = $form;
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return $form;
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}
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/**
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* Method to get the data that should be injected in the form.
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*
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* @return array The default data is an empty array.
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*
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* @since 12.2
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*/
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protected function loadFormData()
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{
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return array();
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}
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/**
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* Method to allow derived classes to preprocess the data.
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*
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* @param string $context The context identifier.
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* @param mixed &$data The data to be processed. It gets altered directly.
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*
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* @return void
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*
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* @since 3.1
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*/
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protected function preprocessData($context, &$data)
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{
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// Get the dispatcher and load the users plugins.
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$dispatcher = JEventDispatcher::getInstance();
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JPluginHelper::importPlugin('content');
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// Trigger the data preparation event.
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$results = $dispatcher->trigger('onContentPrepareData', array($context, $data));
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// Check for errors encountered while preparing the data.
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if (count($results) > 0 && in_array(false, $results, true))
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{
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$this->setError($dispatcher->getError());
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}
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}
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/**
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* Method to allow derived classes to preprocess the form.
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*
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* @param JForm $form A JForm object.
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* @param mixed $data The data expected for the form.
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* @param string $group The name of the plugin group to import (defaults to "content").
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*
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* @return void
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*
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* @see JFormField
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* @since 12.2
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* @throws Exception if there is an error in the form event.
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*/
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protected function preprocessForm(JForm $form, $data, $group = 'content')
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{
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// Import the appropriate plugin group.
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JPluginHelper::importPlugin($group);
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// Get the dispatcher.
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$dispatcher = JEventDispatcher::getInstance();
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// Trigger the form preparation event.
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$results = $dispatcher->trigger('onContentPrepareForm', array($form, $data));
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// Check for errors encountered while preparing the form.
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if (count($results) && in_array(false, $results, true))
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{
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// Get the last error.
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$error = $dispatcher->getError();
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if (!($error instanceof Exception))
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{
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throw new Exception($error);
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}
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}
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}
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/**
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* Method to validate the form data.
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*
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* @param JForm $form The form to validate against.
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* @param array $data The data to validate.
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* @param string $group The name of the field group to validate.
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*
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* @return mixed Array of filtered data if valid, false otherwise.
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*
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* @see JFormRule
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* @see JFilterInput
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* @since 12.2
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*/
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public function validate($form, $data, $group = null)
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{
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// Filter and validate the form data.
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$data = $form->filter($data);
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$return = $form->validate($data, $group);
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// Check for an error.
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if ($return instanceof Exception)
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{
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$this->setError($return->getMessage());
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return false;
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}
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// Check the validation results.
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if ($return === false)
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{
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// Get the validation messages from the form.
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foreach ($form->getErrors() as $message)
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{
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$this->setError($message);
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}
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return false;
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}
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// Tags B/C break at 3.1.2
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if (isset($data['metadata']['tags']) && !isset($data['tags']))
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{
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$data['tags'] = $data['metadata']['tags'];
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}
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return $data;
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}
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}
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