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<?php
/**
* @package FOF
* @copyright Copyright (c)2010-2020 Nicholas K. Dionysopoulos / Akeeba Ltd
* @license GNU General Public License version 2, or later
*/
namespace FOF30\Model;
defined('_JEXEC') || die;
use FOF30\Container\Container;
use FOF30\Input\Input;
use FOF30\Model\Exception\CannotGetName;
use Joomla\CMS\Filter\InputFilter;
use RuntimeException;
use stdClass;
/**
* Class Model
*
* A generic MVC model implementation
*
* @property-read Input $input The input object (magic __get returns the Input from the Container)
*/
class Model
{
/**
* Should I save the model's state in the session?
*
* @var boolean
*/
protected $_savestate = true;
/**
* Should we ignore request data when trying to get state data not already set in the Model?
*
* @var bool
*/
protected $_ignoreRequest = false;
/**
* The model (base) name
*
* @var string
*/
protected $name;
/**
* A state object
*
* @var string
*/
protected $state;
/**
* Are the state variables already set?
*
* @var boolean
*/
protected $_state_set = false;
/**
* The container attached to the model
*
* @var Container
*/
protected $container;
/**
* The state key hash returned by getHash(). This is typically something like "com_foobar.example." (note the dot
* at the end). Always use getHash to get it and setHash to set it.
*
* @var null|string
*/
private $stateHash = null;
/**
* Public class constructor
*
* You can use the $config array to pass some configuration values to the object:
*
* state stdClass|array. The state variables of the Model.
* use_populate Boolean. When true the model will set its state from populateState() instead of the request.
* ignore_request Boolean. When true getState will not automatically load state data from the request.
*
* @param Container $container The configuration variables to this model
* @param array $config Configuration values for this model
*/
public function __construct(Container $container, array $config = [])
{
$this->container = $container;
// Set the model's name from $config
if (isset($config['name']))
{
$this->name = $config['name'];
}
// If $config['name'] is not set, auto-detect the model's name
$this->name = $this->getName();
// Do we have a configured state hash? Since 3.1.2.
if (isset($config['hash']) && !empty($config['hash']))
{
$this->setHash($config['hash']);
}
elseif (isset($config['hash_view']) && !empty($config['hash_view']))
{
$this->getHash($config['hash_view']);
}
// Set the model state
if (array_key_exists('state', $config))
{
if (is_object($config['state']))
{
$this->state = $config['state'];
}
elseif (is_array($config['state']))
{
$this->state = (object) $config['state'];
}
// Protect vs malformed state
else
{
$this->state = new stdClass();
}
}
else
{
$this->state = new stdClass();
}
// Set the internal state marker
if (!empty($config['use_populate']))
{
$this->_state_set = true;
}
// Set the internal state marker
if (!empty($config['ignore_request']))
{
$this->_ignoreRequest = true;
}
}
/**
* Method to get the model name
*
* The model name. By default parsed using the classname or it can be set
* by passing a $config['name'] in the class constructor
*
* @return string The name of the model
*
* @throws RuntimeException If it's impossible to get the name
*/
public function getName()
{
if (empty($this->name))
{
$r = null;
if (!preg_match('/(.*)\\\\Model\\\\(.*)/i', get_class($this), $r))
{
throw new CannotGetName;
}
$this->name = $r[2];
}
return $this->name;
}
/**
* Get a filtered state variable
*
* @param string $key The state variable's name
* @param mixed $default The default value to return if it's not already set
* @param string $filter_type The filter type to use
*
* @return mixed The state variable's contents
*/
public function getState($key = null, $default = null, $filter_type = 'raw')
{
if (empty($key))
{
return $this->internal_getState();
}
// Get the savestate status
$value = $this->internal_getState($key);
// Value is not found in the internal state
if (is_null($value))
{
// Can I fetch it from the request?
if (!$this->_ignoreRequest)
{
$value = $this->container->platform->getUserStateFromRequest($this->getHash() . $key, $key, $this->input, $value, 'none', $this->_savestate);
// Did I get any useful value from the request?
if (is_null($value))
{
return $default;
}
}
// Nope! Let's return the default value
else
{
return $default;
}
}
if (strtoupper($filter_type) == 'RAW')
{
return $value;
}
else
{
$filter = new InputFilter();
return $filter->clean($value, $filter_type);
}
}
/**
* Method to set model state variables
*
* @param string $property The name of the property.
* @param mixed $value The value of the property to set or null.
*
* @return mixed The previous value of the property or null if not set.
*/
public function setState($property, $value = null)
{
if (is_null($this->state))
{
$this->state = new stdClass();
}
return $this->state->$property = $value;
}
/**
* Returns a unique hash for each view, used to prefix the state variables to allow us to retrieve them from the
* state later on. If it's not already set (with setHash) it will be set in the form com_something.myModel. If you
* pass a non-empty $viewName then if it's not already set it will be instead set in the form of
* com_something.viewName.myModel which is useful when you are reusing models in multiple views and want to avoid
* state bleedover among views.
*
* Also see the hash and hash_view parameters in the constructor's options.
*
* @return string
*/
public function getHash($viewName = null)
{
if (is_null($this->stateHash))
{
$this->stateHash = ucfirst($this->container->componentName) . '.';
if (!empty($viewName))
{
$this->stateHash .= $viewName . '.';
}
$this->stateHash .= $this->getName() . '.';
}
return $this->stateHash;
}
/**
* Sets the unique hash to prefix the state variables. The hash is cleaned according to the 'CMD' input filtering,
* must end in a dot (if not a dot is added automatically) and cannot be empty.
*
* @param string $hash
*
* @return void
*
* @see self::getHash()
*/
public function setHash($hash)
{
// Clean the hash, it has to conform to 'CMD' filtering
$tempInput = new Input(['hash' => $hash]);
$hash = $tempInput->getCmd('hash', null);
if (empty($hash))
{
return;
}
if (substr($hash, -1) == '_')
{
$hash = substr($hash, 0, -1);
}
if (substr($hash, -1) != '.')
{
$hash .= '.';
}
$this->stateHash = $hash;
}
/**
* Clears the model state, but doesn't touch the internal lists of records,
* record tables or record id variables. To clear these values, please use
* reset().
*
* @return static
*/
public function clearState()
{
$this->state = new stdClass();
return $this;
}
/**
* Clones the model object and returns the clone
*
* @return static
*/
public function getClone()
{
$clone = clone($this);
return $clone;
}
/**
* Returns a reference to the model's container
*
* @return Container
*/
public function getContainer()
{
return $this->container;
}
/**
* Magic getter; allows to use the name of model state keys as properties. Also handles magic properties:
* $this->input mapped to $this->container->input
*
* @param string $name The state variable key
*
* @return static
*/
public function __get($name)
{
// Handle $this->input
if ($name == 'input')
{
return $this->container->input;
}
return $this->getState($name);
}
/**
* Magic setter; allows to use the name of model state keys as properties
*
* @param string $name The state variable key
* @param mixed $value The state variable value
*
* @return static
*/
public function __set($name, $value)
{
return $this->setState($name, $value);
}
/**
* Magic caller; allows to use the name of model state keys as methods to
* set their values.
*
* @param string $name The state variable key
* @param mixed $arguments The state variable contents
*
* @return static
*/
public function __call($name, $arguments)
{
$arg1 = array_shift($arguments);
$this->setState($name, $arg1);
return $this;
}
/**
* Sets the model state auto-save status. By default the model is set up to
* save its state to the session.
*
* @param boolean $newState True to save the state, false to not save it.
*
* @return static
*/
public function savestate($newState)
{
$this->_savestate = $newState ? true : false;
return $this;
}
/**
* Public setter for the _savestate variable. Set it to true to save the state
* of the Model in the session.
*
* @return static
*/
public function populateSavestate()
{
if (is_null($this->_savestate))
{
$savestate = $this->input->getInt('savestate', -999);
if ($savestate == -999)
{
$savestate = true;
}
$this->savestate($savestate);
}
}
/**
* Gets the ignore request flag. When false, getState() will try to populate state variables not already set from
* same-named state variables in the request.
*
* @return boolean
*/
public function getIgnoreRequest()
{
return $this->_ignoreRequest;
}
/**
* Sets the ignore request flag. When false, getState() will try to populate state variables not already set from
* same-named state variables in the request.
*
* @param boolean $ignoreRequest
*
* @return static
*/
public function setIgnoreRequest($ignoreRequest)
{
$this->_ignoreRequest = $ignoreRequest;
return $this;
}
/**
* Returns a temporary instance of the model. Please note that this returns a _clone_ of the model object, not the
* original object. The new object is set up to not save its stats, ignore the request when getting state variables
* and comes with an empty state.
*
* @return static
*/
public function tmpInstance()
{
return $this->getClone()->savestate(false)->setIgnoreRequest(true)->clearState();
}
/**
* Method to auto-populate the model state.
*
* This method should only be called once per instantiation and is designed
* to be called on the first call to the getState() method unless the model
* configuration flag to ignore the request is set.
*
* @return void
*
* @note Calling getState in this method will result in recursion.
*/
protected function populateState()
{
}
/**
* Triggers an object-specific event. The event runs both locally –if a suitable method exists– and through the
* object's behaviours dispatcher and Joomla! plugin system. Neither handler is expected to return anything (return
* values are ignored). If you want to mark an error and cancel the event you have to raise an exception.
*
* EXAMPLE
* Component: com_foobar, Object name: item, Event: onBeforeSomething, Arguments: array(123, 456)
* The event calls:
* 1. $this->onBeforeSomething(123, 456)
* 2. $his->behavioursDispatcher->trigger('onBeforeSomething', array(&$this, 123, 456))
* 3. Joomla! plugin event onComFoobarModelItemBeforeSomething($this, 123, 456)
*
* @param string $event The name of the event, typically named onPredicateVerb e.g. onBeforeKick
* @param array $arguments The arguments to pass to the event handlers
*
* @return void
*/
protected function triggerEvent($event, array $arguments = [])
{
// If there is an object method for this event, call it
if (method_exists($this, $event))
{
switch (count($arguments))
{
case 0:
$this->{$event}();
break;
case 1:
$this->{$event}($arguments[0]);
break;
case 2:
$this->{$event}($arguments[0], $arguments[1]);
break;
case 3:
$this->{$event}($arguments[0], $arguments[1], $arguments[2]);
break;
case 4:
$this->{$event}($arguments[0], $arguments[1], $arguments[2], $arguments[3]);
break;
case 5:
$this->{$event}($arguments[0], $arguments[1], $arguments[2], $arguments[3], $arguments[4]);
break;
default:
call_user_func_array([$this, $event], $arguments);
break;
}
}
// All other event handlers live outside this object, therefore they need to be passed a reference to this
// objects as the first argument.
array_unshift($arguments, $this);
// Trigger the object's behaviours dispatcher, if such a thing exists
if (property_exists($this, 'behavioursDispatcher') && method_exists($this->behavioursDispatcher, 'trigger'))
{
$this->behavioursDispatcher->trigger($event, $arguments);
}
// Prepare to run the Joomla! plugins now.
// If we have an "on" prefix for the event (e.g. onFooBar) remove it and stash it for later.
$prefix = '';
if (substr($event, 0, 2) == 'on')
{
$prefix = 'on';
$event = substr($event, 2);
}
// Get the component/model prefix for the event
$prefix .= 'Com' . ucfirst($this->container->bareComponentName) . 'Model';
$prefix .= ucfirst($this->getName());
// The event name will be something like onComFoobarItemsBeforeSomething
$event = $prefix . $event;
// Call the Joomla! plugins
$this->container->platform->runPlugins($event, $arguments);
}
/**
* Method to get model state variables
*
* @param string $property Optional parameter name
* @param mixed $default Optional default value
*
* @return object The property where specified, the state object where omitted
*/
private function internal_getState($property = null, $default = null)
{
if (!$this->_state_set)
{
// Protected method to auto-populate the model state.
$this->populateState();
// Set the model state set flag to true.
$this->_state_set = true;
}
if (is_null($property))
{
return $this->state;
}
else
{
if (property_exists($this->state, $property))
{
return $this->state->$property;
}
else
{
return $default;
}
}
}
}