Viewing file:  HelperBroker.php (10.36 KB) -rw-rw-rw-
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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Controller
* @subpackage Zend_Controller_Action
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: HelperBroker.php 18951 2009-11-12 16:26:19Z alexander $
*/
/**
* @see Zend_Controller_Action_HelperBroker_PriorityStack
*/
require_once 'Zend/Controller/Action/HelperBroker/PriorityStack.php';
/**
* @see Zend_Loader
*/
require_once 'Zend/Loader.php';
/**
* @category Zend
* @package Zend_Controller
* @subpackage Zend_Controller_Action
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Controller_Action_HelperBroker
{
/**
* $_actionController - ActionController reference
*
* @var Zend_Controller_Action
*/
protected $_actionController;
/**
* @var Zend_Loader_PluginLoader_Interface
*/
protected static $_pluginLoader;
/**
* $_helpers - Helper array
*
* @var Zend_Controller_Action_HelperBroker_PriorityStack
*/
protected static $_stack = null;
/**
* Set PluginLoader for use with broker
*
* @param Zend_Loader_PluginLoader_Interface $loader
* @return void
*/
public static function setPluginLoader($loader)
{
if ((null !== $loader) && (!$loader instanceof Zend_Loader_PluginLoader_Interface)) {
require_once 'Zend/Controller/Action/Exception.php';
throw new Zend_Controller_Action_Exception('Invalid plugin loader provided to HelperBroker');
}
self::$_pluginLoader = $loader;
}
/**
* Retrieve PluginLoader
*
* @return Zend_Loader_PluginLoader
*/
public static function getPluginLoader()
{
if (null === self::$_pluginLoader) {
require_once 'Zend/Loader/PluginLoader.php';
self::$_pluginLoader = new Zend_Loader_PluginLoader(array(
'Zend_Controller_Action_Helper' => 'Zend/Controller/Action/Helper/',
));
}
return self::$_pluginLoader;
}
/**
* addPrefix() - Add repository of helpers by prefix
*
* @param string $prefix
*/
static public function addPrefix($prefix)
{
$prefix = rtrim($prefix, '_');
$path = str_replace('_', DIRECTORY_SEPARATOR, $prefix);
self::getPluginLoader()->addPrefixPath($prefix, $path);
}
/**
* addPath() - Add path to repositories where Action_Helpers could be found.
*
* @param string $path
* @param string $prefix Optional; defaults to 'Zend_Controller_Action_Helper'
* @return void
*/
static public function addPath($path, $prefix = 'Zend_Controller_Action_Helper')
{
self::getPluginLoader()->addPrefixPath($prefix, $path);
}
/**
* addHelper() - Add helper objects
*
* @param Zend_Controller_Action_Helper_Abstract $helper
* @return void
*/
static public function addHelper(Zend_Controller_Action_Helper_Abstract $helper)
{
self::getStack()->push($helper);
return;
}
/**
* resetHelpers()
*
* @return void
*/
static public function resetHelpers()
{
self::$_stack = null;
return;
}
/**
* Retrieve or initialize a helper statically
*
* Retrieves a helper object statically, loading on-demand if the helper
* does not already exist in the stack. Always returns a helper, unless
* the helper class cannot be found.
*
* @param string $name
* @return Zend_Controller_Action_Helper_Abstract
*/
public static function getStaticHelper($name)
{
$name = self::_normalizeHelperName($name);
$stack = self::getStack();
if (!isset($stack->{$name})) {
self::_loadHelper($name);
}
return $stack->{$name};
}
/**
* getExistingHelper() - get helper by name
*
* Static method to retrieve helper object. Only retrieves helpers already
* initialized with the broker (either via addHelper() or on-demand loading
* via getHelper()).
*
* Throws an exception if the referenced helper does not exist in the
* stack; use {@link hasHelper()} to check if the helper is registered
* prior to retrieving it.
*
* @param string $name
* @return Zend_Controller_Action_Helper_Abstract
* @throws Zend_Controller_Action_Exception
*/
public static function getExistingHelper($name)
{
$name = self::_normalizeHelperName($name);
$stack = self::getStack();
if (!isset($stack->{$name})) {
require_once 'Zend/Controller/Action/Exception.php';
throw new Zend_Controller_Action_Exception('Action helper "' . $name . '" has not been registered with the helper broker');
}
return $stack->{$name};
}
/**
* Return all registered helpers as helper => object pairs
*
* @return array
*/
public static function getExistingHelpers()
{
return self::getStack()->getHelpersByName();
}
/**
* Is a particular helper loaded in the broker?
*
* @param string $name
* @return boolean
*/
public static function hasHelper($name)
{
$name = self::_normalizeHelperName($name);
return isset(self::getStack()->{$name});
}
/**
* Remove a particular helper from the broker
*
* @param string $name
* @return boolean
*/
public static function removeHelper($name)
{
$name = self::_normalizeHelperName($name);
$stack = self::getStack();
if (isset($stack->{$name})) {
unset($stack->{$name});
}
return false;
}
/**
* Lazy load the priority stack and return it
*
* @return Zend_Controller_Action_HelperBroker_PriorityStack
*/
public static function getStack()
{
if (self::$_stack == null) {
self::$_stack = new Zend_Controller_Action_HelperBroker_PriorityStack();
}
return self::$_stack;
}
/**
* Constructor
*
* @param Zend_Controller_Action $actionController
* @return void
*/
public function __construct(Zend_Controller_Action $actionController)
{
$this->_actionController = $actionController;
foreach (self::getStack() as $helper) {
$helper->setActionController($actionController);
$helper->init();
}
}
/**
* notifyPreDispatch() - called by action controller dispatch method
*
* @return void
*/
public function notifyPreDispatch()
{
foreach (self::getStack() as $helper) {
$helper->preDispatch();
}
}
/**
* notifyPostDispatch() - called by action controller dispatch method
*
* @return void
*/
public function notifyPostDispatch()
{
foreach (self::getStack() as $helper) {
$helper->postDispatch();
}
}
/**
* getHelper() - get helper by name
*
* @param string $name
* @return Zend_Controller_Action_Helper_Abstract
*/
public function getHelper($name)
{
$name = self::_normalizeHelperName($name);
$stack = self::getStack();
if (!isset($stack->{$name})) {
self::_loadHelper($name);
}
$helper = $stack->{$name};
$initialize = false;
if (null === ($actionController = $helper->getActionController())) {
$initialize = true;
} elseif ($actionController !== $this->_actionController) {
$initialize = true;
}
if ($initialize) {
$helper->setActionController($this->_actionController)
->init();
}
return $helper;
}
/**
* Method overloading
*
* @param string $method
* @param array $args
* @return mixed
* @throws Zend_Controller_Action_Exception if helper does not have a direct() method
*/
public function __call($method, $args)
{
$helper = $this->getHelper($method);
if (!method_exists($helper, 'direct')) {
require_once 'Zend/Controller/Action/Exception.php';
throw new Zend_Controller_Action_Exception('Helper "' . $method . '" does not support overloading via direct()');
}
return call_user_func_array(array($helper, 'direct'), $args);
}
/**
* Retrieve helper by name as object property
*
* @param string $name
* @return Zend_Controller_Action_Helper_Abstract
*/
public function __get($name)
{
return $this->getHelper($name);
}
/**
* Normalize helper name for lookups
*
* @param string $name
* @return string
*/
protected static function _normalizeHelperName($name)
{
if (strpos($name, '_') !== false) {
$name = str_replace(' ', '', ucwords(str_replace('_', ' ', $name)));
}
return ucfirst($name);
}
/**
* Load a helper
*
* @param string $name
* @return void
*/
protected static function _loadHelper($name)
{
try {
$class = self::getPluginLoader()->load($name);
} catch (Zend_Loader_PluginLoader_Exception $e) {
require_once 'Zend/Controller/Action/Exception.php';
throw new Zend_Controller_Action_Exception('Action Helper by name ' . $name . ' not found');
}
$helper = new $class();
if (!$helper instanceof Zend_Controller_Action_Helper_Abstract) {
require_once 'Zend/Controller/Action/Exception.php';
throw new Zend_Controller_Action_Exception('Helper name ' . $name . ' -> class ' . $class . ' is not of type Zend_Controller_Action_Helper_Abstract');
}
self::getStack()->push($helper);
}
}
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