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view.php

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<?php
/* SVN FILE: $Id: libs_2view_2view_8php-source.html 580 2008-07-01 14:45:49Z gwoo $ */

/**
 * Methods for displaying presentation data in the view.
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework <http://www.cakephp.org/>
 * Copyright 2005-2008, Cake Software Foundation, Inc.
 *                              1785 E. Sahara Avenue, Suite 490-204
 *                              Las Vegas, Nevada 89104
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright       Copyright 2005-2008, Cake Software Foundation, Inc.
 * @link                http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package         cake
 * @subpackage      cake.cake.libs.view
 * @since           CakePHP(tm) v 0.10.0.1076
 * @version         $Revision: 580 $
 * @modifiedby      $LastChangedBy: gwoo $
 * @lastmodified    $Date: 2008-07-01 09:45:49 -0500 (Tue, 01 Jul 2008) $
 * @license         http://www.opensource.org/licenses/mit-license.php The MIT License
 */
/**
 * Included libraries.
 */
App::import('Core', array('Helper', 'ClassRegistry'));
/**
 * View, the V in the MVC triad.
 *
 * Class holding methods for displaying presentation data.
 *
 * @package         cake
 * @subpackage      cake.cake.libs.view
 */
class View extends Object {
/**
 * Path parts for creating links in views.
 *
 * @var string Base URL
 * @access public
 */
    var $base = null;
/**
 * Stores the current URL (for links etc.)
 *
 * @var string Current URL
 */
    var $here = null;
/**
 * Name of the plugin.
 *
 * @link http://manual.cakephp.org/chapter/plugins
 * @var string
 */
    var $plugin = null;
/**
 * Name of the controller.
 *
 * @var string Name of controller
 * @access public
 */
    var $name = null;
/**
 * Action to be performed.
 *
 * @var string Name of action
 * @access public
 */
    var $action = null;
/**
 * Array of parameter data
 *
 * @var array Parameter data
 */
    var $params = array();
/**
 * Current passed params
 *
 * @var mixed
 */
    var $passedArgs = array();
/**
 * Array of data
 *
 * @var array Parameter data
 */
    var $data = array();
/**
 * An array of names of built-in helpers to include.
 *
 * @var mixed A single name as a string or a list of names as an array.
 * @access public
 */
    var $helpers = array('Html');
/**
 * Path to View.
 *
 * @var string Path to View
 */
    var $viewPath = null;
/**
 * Variables for the view
 *
 * @var array
 * @access public
 */
    var $viewVars = array();
/**
 * Name of layout to use with this View.
 *
 * @var string
 * @access public
 */
    var $layout = 'default';
/**
 * Path to Layout.
 *
 * @var string Path to Layout
 */
    var $layoutPath = null;
/**
 * Title HTML element of this View.
 *
 * @var string
 * @access public
 */
    var $pageTitle = false;
/**
 * Turns on or off Cake's conventional mode of rendering views. On by default.
 *
 * @var boolean
 * @access public
 */
    var $autoRender = true;
/**
 * Turns on or off Cake's conventional mode of finding layout files. On by default.
 *
 * @var boolean
 * @access public
 */
    var $autoLayout = true;
/**
 * File extension. Defaults to Cake's template ".ctp".
 *
 * @var string
 */
    var $ext = '.ctp';
/**
 * Sub-directory for this view file.
 *
 * @var string
 */
    var $subDir = null;
/**
 * Theme name.
 *
 * @var string
 */
    var $themeWeb = null;
/**
 * Used to define methods a controller that will be cached.
 *
 * @see Controller::$cacheAction
 * @var mixed
 * @access public
 */
    var $cacheAction = false;
/**
 * holds current errors for the model validation
 *
 * @var array
 */
    var $validationErrors = array();
/**
 * True when the view has been rendered.
 *
 * @var boolean
 */
    var $hasRendered = false;
/**
 * Array of loaded view helpers.
 *
 * @var array
 */
    var $loaded = array();
/**
 * True if in scope of model-specific region
 *
 * @var boolean
 */
    var $modelScope = false;
/**
 * Name of current model this view context is attached to
 *
 * @var string
 */
    var $model = null;
/**
 * Name of association model this view context is attached to
 *
 * @var string
 */
    var $association = null;
/**
 * Name of current model field this view context is attached to
 *
 * @var string
 */
    var $field = null;
/**
 * Suffix of current field this view context is attached to
 *
 * @var string
 */
    var $fieldSuffix = null;
/**
 * The current model ID this view context is attached to
 *
 * @var mixed
 */
    var $modelId = null;
/**
 * List of generated DOM UUIDs
 *
 * @var array
 */
    var $uuids = array();
/**
 * Holds View output.
 *
 * @var string
 **/
    var $output = false;
/**
 * List of variables to collect from the associated controller
 *
 * @var array
 * @access protected
 */
    var $__passedVars = array('viewVars', 'action', 'autoLayout', 'autoRender', 'ext', 'base', 'webroot', 'helpers', 'here', 'layout', 'name', 'pageTitle', 'layoutPath', 'viewPath', 'params', 'data', 'plugin', 'passedArgs', 'cacheAction');
/**
 * Scripts (and/or other <head /> tags) for the layout
 *
 * @var array
 * @access private
 */
    var $__scripts = array();
/**
 * Holds an array of paths.
 *
 * @var array
 */
    var $__paths = array();
/**
 * Constructor
 *
 * @return View
 */
    function __construct(&$controller, $register = true) {
        if (is_object($controller)) {
            $count = count($this->__passedVars);
            for ($j = 0; $j < $count; $j++) {
                $var = $this->__passedVars[$j];
                $this->{$var} = $controller->{$var};
            }
        }
        parent::__construct();

        if ($register) {
            ClassRegistry::addObject('view', $this);
        }
    }
/**
 * Renders a piece of PHP with provided parameters and returns HTML, XML, or any other string.
 *
 * This realizes the concept of Elements, (or "partial layouts")
 * and the $params array is used to send data to be used in the
 * Element.
 *
 * @param string $name Name of template file in the/app/views/elements/ folder
 * @param array $params Array of data to be made available to the for rendered view (i.e. the Element)
 * @return string Rendered Element
 * @access public
 */
    function element($name, $params = array(), $loadHelpers = false) {
        $file = $plugin = $key = null;

        if (isset($params['plugin'])) {
            $plugin = $params['plugin'];
        }

        if (isset($this->plugin) && !$plugin) {
            $plugin = $this->plugin;
        }

        if (isset($params['cache'])) {
            $expires = '+1 day';

            if (is_array($params['cache'])) {
                $expires = $params['cache']['time'];
                $key = Inflector::slug($params['cache']['key']);
            } elseif ($params['cache'] !== true) {
                $expires = $params['cache'];
                $key = implode('_', array_keys($params));
            }

            if ($expires) {
                $cacheFile = 'element_' . $key . '_' . $plugin . Inflector::slug($name);
                $cache = cache('views' . DS . $cacheFile, null, $expires);

                if (is_string($cache)) {
                    return $cache;
                }
            }
        }
        $paths = $this->_paths($plugin);

        foreach ($paths as $path) {
            if (file_exists($path . 'elements' . DS . $name . $this->ext)) {
                $file = $path . 'elements' . DS . $name . $this->ext;
                break;
            } elseif (file_exists($path . 'elements' . DS . $name . '.thtml')) {
                $file = $path . 'elements' . DS . $name . '.thtml';
                break;
            }
        }

        if (is_file($file)) {
            $params = array_merge_recursive($params, $this->loaded);
            $element = $this->_render($file, array_merge($this->viewVars, $params), $loadHelpers);
            if (isset($params['cache']) && isset($cacheFile) && isset($expires)) {
                cache('views' . DS . $cacheFile, $element, $expires);
            }
            return $element;
        }
        $file = $paths[0] . 'elements' . DS . $name . $this->ext;

        if (Configure::read() > 0) {
            return "Not Found: " . $file;
        }
    }
/**
 * Renders view for given action and layout. If $file is given, that is used
 * for a view filename (e.g. customFunkyView.ctp).
 *
 * @param string $action Name of action to render for
 * @param string $layout Layout to use
 * @param string $file Custom filename for view
 * @return string Rendered Element
 */
    function render($action = null, $layout = null, $file = null) {
        if ($this->hasRendered) {
            return true;
        }
        $out = null;

        if ($file != null) {
            $action = $file;
        }

        if ($action !== false && $viewFileName = $this->_getViewFileName($action)) {
            if (substr($viewFileName, -3) === 'ctp' || substr($viewFileName, -5) === 'thtml') {
                $out = View::_render($viewFileName, $this->viewVars);
            } else {
                $out = $this->_render($viewFileName, $this->viewVars);
            }
        }

        if ($layout === null) {
            $layout = $this->layout;
        }

        if ($out !== false) {
            if ($layout && $this->autoLayout) {
                $out = $this->renderLayout($out, $layout);
                if (isset($this->loaded['cache']) && (($this->cacheAction != false)) && (Configure::read('Cache.check') === true)) {
                    $replace = array('<cake:nocache>', '</cake:nocache>');
                    $out = str_replace($replace, '', $out);
                }
            }
            $this->hasRendered = true;
        } else {
            $out = $this->_render($viewFileName, $this->viewVars);
            trigger_error(sprintf(__("Error in view %s, got: <blockquote>%s</blockquote>", true), $viewFileName, $out), E_USER_ERROR);
        }
        return $out;
    }
/**
 * Renders a layout. Returns output from _render(). Returns false on error.
 *
 * @param string $content_for_layout Content to render in a view, wrapped by the surrounding layout.
 * @return mixed Rendered output, or false on error
 */
    function renderLayout($content_for_layout, $layout = null) {
        $layout_fn = $this->_getLayoutFileName($layout);
        $debug = '';

        if (isset($this->viewVars['cakeDebug']) && Configure::read() > 2) {
            $debug = View::element('dump', array('controller' => $this->viewVars['cakeDebug']), false);
            unset($this->viewVars['cakeDebug']);
        }

        if ($this->pageTitle !== false) {
            $pageTitle = $this->pageTitle;
        } else {
            $pageTitle = Inflector::humanize($this->viewPath);
        }
        $data_for_layout = array_merge($this->viewVars,
            array(
                'title_for_layout' => $pageTitle,
                'content_for_layout' => $content_for_layout,
                'scripts_for_layout' => join("\n\t", $this->__scripts),
                'cakeDebug' => $debug
            )
        );

        if (empty($this->loaded) && !empty($this->helpers)) {
            $loadHelpers = true;
        } else {
            $loadHelpers = false;
            $data_for_layout = array_merge($data_for_layout, $this->loaded);
        }

        if (!empty($this->loaded)) {
            $helpers = array_keys($this->loaded);
            foreach ($helpers as $helperName) {
                $helper =& $this->loaded[$helperName];
                if (is_object($helper)) {
                    if (is_subclass_of($helper, 'Helper') || is_subclass_of($helper, 'helper')) {
                        $helper->beforeLayout();
                    }
                }
            }
        }

        if (substr($layout_fn, -3) === 'ctp' || substr($layout_fn, -5) === 'thtml') {
            $this->output = View::_render($layout_fn, $data_for_layout, $loadHelpers, true);
        } else {
            $this->output = $this->_render($layout_fn, $data_for_layout, $loadHelpers);
        }

        if ($this->output === false) {
            $this->output = $this->_render($layout_fn, $data_for_layout);
            trigger_error(sprintf(__("Error in layout %s, got: <blockquote>%s</blockquote>", true), $layout_fn, $this->output), E_USER_ERROR);
            return false;
        }

        if (!empty($this->loaded)) {
            $helpers = array_keys($this->loaded);
            foreach ($helpers as $helperName) {
                $helper =& $this->loaded[$helperName];
                if (is_object($helper)) {
                    if (is_subclass_of($helper, 'Helper') || is_subclass_of($helper, 'helper')) {
                        $helper->afterLayout();
                    }
                }
            }
        }
        return $this->output;
    }
/**
 * Render cached view
 *
 * @param string $filename the cache file to include
 * @param string $timeStart the page render start time
 */
    function renderCache($filename, $timeStart) {
        ob_start();
        include ($filename);

        if (Configure::read() > 0 && $this->layout != 'xml') {
            echo "<!-- Cached Render Time: " . round(getMicrotime() - $timeStart, 4) . "s -->";
        }
        $out = ob_get_clean();

        if (preg_match('/^<!--cachetime:(\\d+)-->/', $out, $match)) {
            if (time() >= $match['1']) {
                @unlink($filename);
                unset ($out);
                return false;
            } else {
                if ($this->layout === 'xml') {
                    header('Content-type: text/xml');
                }
                $out = str_replace('<!--cachetime:'.$match['1'].'-->', '', $out);
                echo $out;
                return true;
            }
        }
    }
/**
 * Returns a list of variables available in the current View context
 *
 * @return array
 * @access public
 */
    function getVars() {
        return array_keys($this->viewVars);
    }
/**
 * Returns the contents of the given View variable(s)
 *
 * @return array
 * @access public
 */
    function getVar($var) {
        if (!isset($this->viewVars[$var])) {
            return null;
        } else {
            return $this->viewVars[$var];
        }
    }
/**
 * Adds a script block or other element to be inserted in $scripts_for_layout in
 * the <head /> of a document layout
 *
 * @param string $name
 * @param string $content
 * @access public
 */
    function addScript($name, $content = null) {
        if (empty($content)) {
            if (!in_array($name, array_values($this->__scripts))) {
                $this->__scripts[] = $name;
            }
        } else {
            $this->__scripts[$name] = $content;
        }
    }
/**
 * Generates a unique, non-random DOM ID for an object, based on the object type and the target URL.
 *
 * @param string $object Type of object, i.e. 'form' or 'link'
 * @param string $url The object's target URL
 * @return string
 * @access public
 */
    function uuid($object, $url) {
        $c = 1;
        $url = Router::url($url);
        $hash = $object . substr(md5($object . $url), 0, 10);
        while (in_array($hash, $this->uuids)) {
            $hash = $object . substr(md5($object . $url . $c), 0, 10);
            $c++;
        }
        $this->uuids[] = $hash;
        return $hash;
    }
/**
 * Returns the entity reference of the current context as an array of identity parts
 *
 * @return array An array containing the identity elements of an entity
 */
    function entity() {
        return array_values(Set::filter(array(
            ife($this->association, $this->association, $this->model),
            $this->modelId, $this->field, $this->fieldSuffix
        )));
    }
/**
 * Allows a template or element to set a variable that will be available in
 * a layout or other element. Analagous to Controller::set.
 *
 * @param mixed $one A string or an array of data.
 * @param mixed $two Value in case $one is a string (which then works as the key).
 *              Unused if $one is an associative array, otherwise serves as the values to $one's keys.
 * @return unknown
 */
    function set($one, $two = null) {
        $data = null;
        if (is_array($one)) {
            if (is_array($two)) {
                $data = array_combine($one, $two);
            } else {
                $data = $one;
            }
        } else {
            $data = array($one => $two);
        }

        if ($data == null) {
            return false;
        }

        foreach ($data as $name => $value) {
            if ($name == 'title') {
                $this->pageTitle = $value;
            } else {
                $this->viewVars[$name] = $value;
            }
        }
    }
/**
 * Displays an error page to the user. Uses layouts/error.ctp to render the page.
 *
 * @param integer $code HTTP Error code (for instance: 404)
 * @param string $name Name of the error (for instance: Not Found)
 * @param string $message Error message as a web page
 */
    function error($code, $name, $message) {
        header ("HTTP/1.1 {$code} {$name}");
        print ($this->_render(
            $this->_getLayoutFileName('error'),
            array('code' => $code, 'name' => $name, 'message' => $message)
        ));
    }
/**
 * Renders and returns output for given view filename with its
 * array of data.
 *
 * @param string $___viewFn Filename of the view
 * @param array $___dataForView Data to include in rendered view
 * @return string Rendered output
 * @access protected
 */
    function _render($___viewFn, $___dataForView, $loadHelpers = true, $cached = false) {
        $loadedHelpers = array();

        if ($this->helpers != false && $loadHelpers === true) {
            $loadedHelpers = $this->_loadHelpers($loadedHelpers, $this->helpers);

            foreach (array_keys($loadedHelpers) as $helper) {
                $camelBackedHelper = Inflector::variable($helper);
                ${$camelBackedHelper} =& $loadedHelpers[$helper];
                $this->loaded[$camelBackedHelper] =& ${$camelBackedHelper};
            }

            foreach ($loadedHelpers as $helper) {
                if (is_object($helper)) {
                    if (is_subclass_of($helper, 'Helper') || is_subclass_of($helper, 'helper')) {
                        $helper->beforeRender();
                    }
                }
            }
        }

        extract($___dataForView, EXTR_SKIP);
        ob_start();

        if (Configure::read() > 0) {
            include ($___viewFn);
        } else {
            @include ($___viewFn);
        }

        if (!empty($loadedHelpers)) {
            foreach ($loadedHelpers as $helper) {
                if (is_object($helper)) {
                    if (is_subclass_of($helper, 'Helper') || is_subclass_of($helper, 'helper')) {
                        $helper->afterRender();
                    }
                }
            }
        }
        $out = ob_get_clean();

        if (isset($this->loaded['cache']) && (($this->cacheAction != false)) && (Configure::read('Cache.check') === true)) {
            if (is_a($this->loaded['cache'], 'CacheHelper')) {
                $cache =& $this->loaded['cache'];
                $cache->base = $this->base;
                $cache->here = $this->here;
                $cache->helpers = $this->helpers;
                $cache->action = $this->action;
                $cache->controllerName = $this->name;
                $cache->layout  = $this->layout;
                $cache->cacheAction = $this->cacheAction;
                $cache->cache($___viewFn, $out, $cached);
            }
        }
        return $out;
    }
/**
 * Loads helpers, with their dependencies.
 *
 * @param array $loaded List of helpers that are already loaded.
 * @param array $helpers List of helpers to load.
 * @param string $parent holds name of helper, if loaded helper has helpers
 * @return array
 */
    function &_loadHelpers(&$loaded, $helpers, $parent = null) {
        if (empty($loaded)) {
            $helpers[] = 'Session';
        }

        foreach ($helpers as $i => $helper) {
            $options = array();

            if (!is_int($i)) {
                $options = $helper;
                $helper = $i;
            }
            $parts = preg_split('/\/|\./', $helper);

            if (count($parts) === 1) {
                $plugin = $this->plugin;
            } else {
                $plugin = Inflector::underscore($parts['0']);
                $helper = $parts[count($parts) - 1];
            }
            $helperCn = $helper . 'Helper';

            if (in_array($helper, array_keys($loaded)) !== true) {
                if (!class_exists($helperCn)) {
                    if (is_null($plugin) || !App::import('Helper', $plugin . '.' . $helper)) {
                        if (!App::import('Helper', $helper)) {
                            $this->cakeError('missingHelperFile', array(array(
                                'helper' => $helper,
                                'file' => Inflector::underscore($helper) . '.php',
                                'base' => $this->base
                            )));
                            return false;
                        }
                    }
                    if (!class_exists($helperCn)) {
                        $this->cakeError('missingHelperClass', array(array(
                            'helper' => $helper,
                            'file' => Inflector::underscore($helper) . '.php',
                            'base' => $this->base
                        )));
                        return false;
                    }
                }
                $loaded[$helper] =& new $helperCn($options);
                $vars = array('base', 'webroot', 'here', 'params', 'action', 'data', 'themeWeb', 'plugin');
                $c = count($vars);

                for ($j = 0; $j < $c; $j++) {
                    $loaded[$helper]->{$vars[$j]} = $this->{$vars[$j]};
                }

                if (!empty($this->validationErrors)) {
                    $loaded[$helper]->validationErrors = $this->validationErrors;
                }
                if (is_array($loaded[$helper]->helpers) && !empty($loaded[$helper]->helpers)) {
                    $loaded =& $this->_loadHelpers($loaded, $loaded[$helper]->helpers, $helper);
                }
            }
            if (isset($loaded[$parent])) {
                $loaded[$parent]->{$helper} =& $loaded[$helper];
            }
        }
        return $loaded;
    }
/**
 * Returns filename of given action's template file (.ctp) as a string.
 * CamelCased action names will be under_scored! This means that you can have
 * LongActionNames that refer to long_action_names.ctp views.
 *
 * @param string $action Controller action to find template filename for
 * @return string Template filename
 * @access protected
 */
    function _getViewFileName($name = null) {
        $subDir = null;

        if (!is_null($this->subDir)) {
            $subDir = $this->subDir . DS;
        }

        if ($name === null) {
            $name = $this->action;
        }
        $name = str_replace('/', DS, $name);

        if (strpos($name, DS) === false && $name[0] !== '.') {
            $name = $this->viewPath . DS . $subDir . Inflector::underscore($name);
        } elseif (strpos($name, DS) !== false) {
            if ($name{0} === DS || $name{1} === ':') {
                if (is_file($name)) {
                    return $name;
                }
                $name = trim($name, DS);
            } else if ($name[0] === '.') {
                $name = substr($name, 3);
            } else {
                $name = $this->viewPath . DS . $subDir . $name;
            }
        }

        $paths = $this->_paths($this->plugin);

        foreach ($paths as $path) {
            if (file_exists($path . $name . $this->ext)) {
                return $path . $name . $this->ext;
            } elseif (file_exists($path . $name . '.ctp')) {
                return $path . $name . '.ctp';
            } elseif (file_exists($path . $name . '.thtml')) {
                return $path . $name . '.thtml';
            }
        }
        $defaultPath = $paths[0];

        if ($this->plugin) {
            $pluginPaths = Configure::read('pluginPaths');
            foreach ($paths as $path) {
                if (strpos($path, $pluginPaths[0]) === 0) {
                    $defaultPath = $path;
                    break;
                }
            }
        }
        return $this->_missingView($defaultPath . $name . $this->ext, 'missingView');
    }

/**
 * Returns layout filename for this template as a string.
 *
 * @return string Filename for layout file (.ctp).
 * @access protected
 */
    function _getLayoutFileName($name = null) {
        if ($name === null) {
            $name = $this->layout;
        }
        $subDir = null;

        if (!is_null($this->layoutPath)) {
            $subDir = $this->layoutPath . DS;
        }
        $paths = $this->_paths($this->plugin);
        $file = 'layouts' . DS . $subDir . $name;

        foreach ($paths as $path) {
            if (file_exists($path . $file . $this->ext)) {
                return $path . $file . $this->ext;
            } elseif (file_exists($path . $file . '.ctp')) {
                return $path . $file . '.ctp';
            } elseif (file_exists($path . $file . '.thtml')) {
                return $path . $file . '.thtml';
            }
        }
        return $this->_missingView($paths[0] . $file . $this->ext, 'missingLayout');
    }
/**
 * Return a misssing view error message
 *
 * @param string $viewFileName the filename that should exist
 * @return cakeError
 */
    function _missingView($file, $error = 'missingView') {

        if ($error === 'missingView') {
            $this->cakeError('missingView', array(
                    'className' => $this->name,
                    'action' => $this->action,
                    'file' => $file,
                    'base' => $this->base
                    ));
            return false;
        } elseif ($error === 'missingLayout') {
            $this->cakeError('missingLayout', array(
                    'layout' => $this->layout,
                    'file' => $file,
                    'base' => $this->base
                    ));
            return false;
        }

    }
/**
 * Return all possible paths to find view files in order
 *
 * @param string $plugin
 * @return array paths
 * @access protected
 */
    function _paths($plugin = null, $cached = true) {
        if ($plugin === null && $cached === true && !empty($this->__paths)) {
            return $this->__paths;
        }
        $paths = array();
        $viewPaths = Configure::read('viewPaths');

        if ($plugin !== null) {
            $count = count($viewPaths);
            for ($i = 0; $i < $count; $i++) {
                $paths[] = $viewPaths[$i] . 'plugins' . DS . $plugin . DS;
            }
            $pluginPaths = Configure::read('pluginPaths');
            $count = count($pluginPaths);

            for ($i = 0; $i < $count; $i++) {
                $paths[] = $pluginPaths[$i] . $plugin . DS . 'views' . DS;
            }
        }
        $paths = array_merge($paths, $viewPaths);

        if (empty($this->__paths)) {
            $this->__paths = $paths;
        }
        return $paths;
    }
/**
 * @deprecated
 * @see View::element
 */
    function renderElement($name, $params = array(), $loadHelpers = false) {
        return $this->element($name, $params, $loadHelpers);
    }
}
?>

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