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<?php
/**
* App class
*
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2010, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @package cake.libs
* @since CakePHP(tm) v 1.2.0.6001
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

/**
* App is responsible for path management, class location and class loading.
*
* ### Adding paths
*
* You can add paths to the search indexes App uses to find classes using `App::build()`. Adding
* additional controller paths for example would alter where CakePHP looks for controllers.
* This allows you to split your application up across the filesystem.
*
* ### Packages
*
* CakePHP is organized around the idea of packages, each class belongs to a package or folder where other
* classes reside. You can configure each package location in your application using `App::build('APackage/SubPackage', $paths)`
* to inform the framework where should each class be loaded. Almost every class in the CakePHP framework can be swapped
* by your own compatible implementation. If you wish to use you own class instead of the classes the framework provides,
* just add the class to your libs folder mocking the directory location of where CakePHP expects to find it.
*
* For instance if you'd like to use your own HttpSocket class, put it under
*
* app/libs/Network/Http/HttpSocket.php
*
* ### Inspecting loaded paths
*
* You can inspect the currently loaded paths using `App::path('Controller')` for example to see loaded
* controller paths.
*
* It is also possible to inspect paths for plugin classes, for instance, to see a plugin's helpers you would call
* `App::path('View/Helper', 'MyPlugin')`
*
* ### Locating plugins and themes
*
* Plugins and Themes can be located with App as well. Using App::pluginPath('DebugKit') for example, will
* give you the full path to the DebugKit plugin. App::themePath('purple'), would give the full path to the
* `purple` theme.
*
* ### Inspecting known objects
*
* You can find out which objects App knows about using App::objects('Controller') for example to find
* which application controllers App knows about.
*
* @link http://book.cakephp.org/view/933/The-App-Class
* @package cake.libs
*/
class App {

/**
* Append paths
*
* @constant APPEND
*/
const APPEND = 'append';

/**
* Prepend paths
*
* @constant PREPEND
*/
const PREPEND = 'prepend';

/**
* Reset paths instead of merging
*
* @constant RESET
*/
const RESET = true;

/**
* List of object types and their properties
*
* @var array
*/
public static $types = array(
'class' => array('extends' => null, 'core' => true),
'file' => array('extends' => null, 'core' => true),
'model' => array('extends' => 'AppModel', 'core' => false),
'behavior' => array( 'suffix' => 'Behavior', 'extends' => 'Model/ModelBehavior', 'core' => true),
'controller' => array('suffix' => 'Controller', 'extends' => 'AppController', 'core' => true),
'component' => array('suffix' => 'Component', 'extends' => null, 'core' => true),
'lib' => array('extends' => null, 'core' => true),
'view' => array('suffix' => 'View', 'extends' => null, 'core' => true),
'helper' => array('suffix' => 'Helper', 'extends' => 'AppHelper', 'core' => true),
'vendor' => array('extends' => null, 'core' => true),
'shell' => array('suffix' => 'Shell', 'extends' => 'Shell', 'core' => true),
'plugin' => array('extends' => null, 'core' => true)
);

/**
* Paths to search for files.
*
* @var array
*/
public static $search = array();

/**
* Whether or not to return the file that is loaded.
*
* @var boolean
*/
public static $return = false;

/**
* Determines if $__maps and $__paths cache should be written.
*
* @var boolean
*/
private static $__cache = false;

/**
* Holds key/value pairs of $type => file path.
*
* @var array
*/
private static $__map = array();

/**
* Holds paths for deep searching of files.
*
* @var array
*/
private static $__paths = array();

/**
* Holds loaded files.
*
* @var array
*/
private static $__loaded = array();

/**
* Holds and key => value array of object types.
*
* @var array
*/
private static $__objects = array();

/**
* Holds the location of each class
*
*/
private static $__classMap = array();

/**
* Holds the possible paths for each package name
*
*/
private static $__packages = array();

/**
* Holds the templates for each customizable package path in the application
*
*/
private static $__packageFormat = array();

/**
* Maps an old style CakePHP class type to the corresponding package
*
*/
public static $legacy = array(
'models' => 'Model',
'behaviors' => 'Model/Behavior',
'datasources' => 'Model/Datasource',
'controllers' => 'Controller',
'components' => 'Controller/Component',
'views' => 'View',
'helpers' => 'View/Helper',
'shells' => 'Console/Command',
'libs' => 'Lib'
);

/**
* Inicates whether the class cache should be stored again because of an addition to it
*
*/
private static $_cacheChange = false;

/**
* Inicates whether the object cache should be stored again because of an addition to it
*
*/
private static $_objectCacheChange = false;

/**
* Used to read information stored path
*
* Usage:
*
* `App::path('Model'); will return all paths for models`
*
* `App::path('Model/Datasource', 'MyPlugin'); will return the path for datasources under the 'MyPlugin' plugin`
*
* @param string $type type of path
* @param string $plugin name of plugin
* @return string array
*/
public static function path($type, $plugin = null) {
if (!empty(self::$legacy[$type])) {
$type = self::$legacy[$type];
}

if (!empty($plugin)) {
$path = array();
$pluginPath = self::pluginPath($plugin);
if (!empty(self::$__packageFormat[$type])) {
foreach (self::$__packageFormat[$type] as $f) {
$path[] = sprintf($f, $pluginPath);
}
}
$path[] = $pluginPath . 'Lib' . DS . $type . DS;
return $path;
}

if (!isset(self::$__packages[$type])) {
return array();
}
return self::$__packages[$type];
}

/**
* Sets up each package location on the file system. You can configure multiple search paths
* for each package, those will be used to look for files one folder at a time in the specified order
* All paths should be terminated with a Directory separator
*
* Usage:
*
* `App::build(array(Model' => array('/a/full/path/to/models/'))); will setup a new search path for the Model package`
*
* `App::build(array('Model' => array('/path/to/models/')), App::RESET); will setup the path as the only valid path for searching models`
*
* `App::build(array('View/Helper' => array('/path/to/helpers/', '/another/path/))); will setup multiple search paths for helpers`
*
* If reset is set to true, all loaded plugins will be forgotten and they will be needed to be loaded again.
*
* @param array $paths associative array with package names as keys and a list of directories for new search paths
* @param mixed $mode App::RESET will set paths, App::APPEND with append paths, App::PREPEND will prepend paths, [default] App::PREPEND
* @return void
*/
public static function build($paths = array(), $mode = App::PREPEND) {
if (empty(self::$__packageFormat)) {
self::$__packageFormat = array(
'Model' => array(
'%s' . 'Model' . DS,
'%s' . 'models' . DS
),
'Model/Behavior' => array(
'%s' . 'Model' . DS . 'Behavior' . DS,
'%s' . 'models' . DS . 'behaviors' . DS
),
'Model/Datasource' => array(
'%s' . 'Model' . DS . 'Datasource' . DS,
'%s' . 'models' . DS . 'datasources' . DS
),
'Model/Datasource/Database' => array(
'%s' . 'Model' . DS . 'Datasource' . DS . 'Database' . DS,
'%s' . 'models' . DS . 'datasources' . DS . 'database' . DS
),
'Model/Datasource/Session' => array(
'%s' . 'Model' . DS . 'Datasource' . DS . 'Session' . DS,
'%s' . 'models' . DS . 'datasources' . DS . 'session' . DS
),
'Controller' => array(
'%s' . 'Controller' . DS,
'%s' . 'controllers' . DS
),
'Controller/Component' => array(
'%s' . 'Controller' . DS . 'Component' . DS,
'%s' . 'controllers' . DS . 'components' . DS
),
'View' => array(
'%s' . 'View' . DS,
'%s' . 'views' . DS
),
'View/Helper' => array(
'%s' . 'View' . DS . 'Helper' . DS,
'%s' . 'views' . DS . 'helpers' . DS
),
'Console' => array(
'%s' . 'Console' . DS,
'%s' . 'console' . DS
),
'Console/Command' => array(
'%s' . 'Console' . DS . 'Command' . DS,
'%s' . 'console' . DS . 'shells' . DS,
),
'Console/Command/Task' => array(
'%s' . 'Console' . DS . 'Command' . DS . 'Task' . DS,
'%s' . 'console' . DS . 'shells' . DS . 'tasks' . DS
),
'Lib' => array(
'%s' . 'Lib' . DS,
'%s' . 'libs' . DS
),
'locales' => array(
'%s' . 'locale' . DS
),
'vendors' => array('%s' . 'Vendor' . DS, VENDORS),
'plugins' => array(
APP . 'Plugin' . DS,
APP . 'plugins' . DS,
dirname(dirname(CAKE)) . DS . 'plugins' . DS,
)
);
}

if ($mode === App::RESET) {
foreach ($paths as $type => $new) {
if (!empty(self::$legacy[$type])) {
$type = self::$legacy[$type];
}
self::$__packages[$type] = (array)$new;
self::objects($type, null, false);
}
return $paths;
}

//Provides Backwards compatibility for old-style package names
$legacyPaths = array();
foreach ($paths as $type => $path) {
if (!empty(self::$legacy[$type])) {
$type = self::$legacy[$type];
}
$legacyPaths[$type] = $path;
}

$paths = $legacyPaths;
$defaults = array();
foreach (self::$__packageFormat as $package => $format) {
foreach ($format as $f) {
$defaults[$package][] = sprintf($f, APP);
}
}

foreach ($defaults as $type => $default) {
if (empty(self::$__packages[$type]) || empty($paths)) {
self::$__packages[$type] = $default;
}

if (!empty($paths[$type])) {
if ($mode === App::PREPEND) {
$path = array_merge((array)$paths[$type], self::$__packages[$type]);
} else {
$path = array_merge(self::$__packages[$type], (array)$paths[$type]);
}
} else {
$path = self::$__packages[$type];
}

self::$__packages[$type] = array_values(array_unique($path));
}
}

/**
* Gets the path that a plugin is on. Searches through the defined plugin paths.
*
* Usage:
*
* `App::pluginPath('MyPlugin'); will return the full path to 'MyPlugin' plugin'`
*
* @param string $plugin CamelCased/lower_cased plugin name to find the path of.
* @return string full path to the plugin.
*/
public static function pluginPath($plugin) {
return CakePlugin::path($plugin);
}

/**
* Finds the path that a theme is on. Searches through the defined theme paths.
*
* Usage:
*
* `App::themePath('MyTheme'); will return the full path to the 'MyTheme' theme`
*
* @param string $theme theme name to find the path of.
* @return string full path to the theme.
*/
public static function themePath($theme) {
$themeDir = 'Themed' . DS . Inflector::camelize($theme);
foreach (self::$__packages['View'] as $path) {
if (is_dir($path . $themeDir)) {
return $path . $themeDir . DS ;
}
}
return self::$__packages['View'][0] . $themeDir . DS;
}

/**
* Returns the full path to a package inside the CakePHP core
*
* Usage:
*
* `App::core('Cache/Engine'); will return the full path to the cache engines package`
*
* @param string $type
* @return string full path to package
*/
public static function core($type) {
return array(CAKE . str_replace('/', DS, $type) . DS);
}

/**
* Returns an array of objects of the given type.
*
* Example usage:
*
* `App::objects('plugin');` returns `array('DebugKit', 'Blog', 'User');`
*
* `App::objects('Controller');` returns `array('PagesController', 'BlogController');`
*
* You can also search only within a plugin's objects by using the plugin dot
* syntax.
*
* `App::objects('MyPlugin.Model');` returns `array('MyPluginPost', 'MyPluginComment');`
*
* @param string $type Type of object, i.e. 'Model', 'Controller', 'View/Helper', 'file', 'class' or 'plugin'
* @param mixed $path Optional Scan only the path given. If null, paths for the chosen type will be used.
* @param boolean $cache Set to false to rescan objects of the chosen type. Defaults to true.
* @return mixed Either false on incorrect / miss. Or an array of found objects.
*/
public static function objects($type, $path = null, $cache = true) {
$extension = '/\.php$/';
$includeDirectories = false;
$name = $type;

if ($type === 'plugin') {
$type = 'plugins';
}

if ($type == 'plugins') {
$extension = '/.*/';
$includeDirectories = true;
}

list($plugin, $type) = pluginSplit($type);

if (isset(self::$legacy[$type . 's'])) {
$type = self::$legacy[$type . 's'];
}

if ($type === 'file' && !$path) {
return false;
} elseif ($type === 'file') {
$extension = '/\.php$/';
$name = $type . str_replace(DS, '', $path);
}

if (empty(self::$__objects) && $cache === true) {
self::$__objects = Cache::read('object_map', '_cake_core_');
}

$cacheLocation = empty($plugin) ? 'app' : $plugin;

if ($cache !== true || !isset(self::$__objects[$cacheLocation][$name])) {
$objects = array();

if (empty($path)) {
$path = self::path($type, $plugin);
}

foreach ((array)$path as $dir) {
if ($dir != APP && is_dir($dir)) {
$files = new RegexIterator(new DirectoryIterator($dir), $extension);
foreach ($files as $file) {
if (!$file->isDot()) {
$isDir = $file->isDir() ;
if ($isDir && $includeDirectories) {
$objects[] = basename($file);
} elseif (!$includeDirectories && !$isDir) {
$objects[] = substr(basename($file), 0, -4);
}
}
}
}
}

if ($type !== 'file') {
foreach ($objects as $key => $value) {
$objects[$key] = Inflector::camelize($value);
}
}

if ($cache === true) {
self::$__cache = true;
}
if ($plugin) {
return $objects;
}
self::$__objects[$cacheLocation][$name] = $objects;
self::$_objectCacheChange = true;
}

return self::$__objects[$cacheLocation][$name];
}

/**
* Allows you to modify the object listings that App maintains inside of it
* Useful for testing
*
* @param string $type Type of object listing you are changing
* @param array $values The values $type should be set to.
* @return void
*/
public static function setObjects($type, $values) {
list($plugin, $type) = pluginSplit($type);
$cacheLocation = empty($plugin) ? 'app' : $plugin;
self::$__objects[$cacheLocation][$type] = $values;
}

/**
* Declares a package for a class. This package location will be used
* by the automatic class loader if the class is tried to be used
*
* Usage:
*
* `App::uses('MyCustomController', 'Controller');` will setup the class to be found under Controller package
*
* `App::uses('MyHelper', 'MyPlugin.View/Helper');` will setup the helper class to be found in plugin's helper package
*
* @param string $className the name of the class to configure package for
* @param string $location the package name
*/
public static function uses($className, $location) {
self::$__classMap[$className] = $location;
}

/**
* Method to handle the automatic class loading. It will look for each class' package
* defined using App::uses() and with this information it will resolve the package name to a full path
* to load the class from. File name for each class should follow the class name. For instance,
* if a class is name `MyCustomClass` the file name should be `MyCustomClass.php`
*
* @param string $className the name of the class to load
*/
public static function load($className) {
if (!isset(self::$__classMap[$className])) {
return false;
}

if ($file = self::__mapped($className)) {
return include $file;
}

$parts = explode('.', self::$__classMap[$className], 2);
list($plugin, $package) = count($parts) > 1 ? $parts : array(null, current($parts));
$paths = self::path($package, $plugin);

if (empty($plugin)) {
$appLibs = empty(self::$__packages['Lib']) ? APPLIBS : current(self::$__packages['Lib']);
$paths[] = $appLibs . $package . DS;
$paths[] = CAKE . $package . DS;
}

foreach ($paths as $path) {
$file = $path . $className . '.php';
if (file_exists($file)) {
self::__map($file, $className);
return include $file;
}
}

//To help apps migrate to 2.0 old style file names are allowed
foreach ($paths as $path) {
$underscored = Inflector::underscore($className);
$tries = array($path . $underscored . '.php');
$parts = explode('_', $underscored);
if (count($parts) > 1) {
array_pop($parts);
$tries[] = $path . implode('_', $parts) . '.php';
}
foreach ($tries as $file) {
if (file_exists($file)) {
self::__map($file, $className);
return include $file;
}
}
}

return false;
}

/**
* Finds classes based on $name or specific file(s) to search. Calling App::import() will
* not construct any classes contained in the files. It will only find and require() the file.
*
* @link http://book.cakephp.org/view/934/Using-App-import
* @param mixed $type The type of Class if passed as a string, or all params can be passed as
* an single array to $type,
* @param string $name Name of the Class or a unique name for the file
* @param mixed $parent boolean true if Class Parent should be searched, accepts key => value
* array('parent' => $parent ,'file' => $file, 'search' => $search, 'ext' => '$ext');
* $ext allows setting the extension of the file name
* based on Inflector::underscore($name) . ".$ext";
* @param array $search paths to search for files, array('path 1', 'path 2', 'path 3');
* @param string $file full name of the file to search for including extension
* @param boolean $return, return the loaded file, the file must have a return
* statement in it to work: return $variable;
* @return boolean true if Class is already in memory or if file is found and loaded, false if not
*/
public static function import($type = null, $name = null, $parent = true, $search = array(), $file = null, $return = false) {
$ext = null;

if (is_array($type)) {
extract($type, EXTR_OVERWRITE);
}

if (is_array($parent)) {
extract($parent, EXTR_OVERWRITE);
}

if ($name == null && $file == null) {
return false;
}

if (is_array($name)) {
foreach ($name as $class) {
if (!App::import(compact('type', 'parent', 'search', 'file', 'return') + array('name' => $class))) {
return false;
}
}
return true;
}

$originalType = strtolower($type);
$specialPackage = in_array($originalType, array('file', 'vendor'));
if (!$specialPackage && isset(self::$legacy[$originalType . 's'])) {
$type = self::$legacy[$originalType . 's'];
}
list($plugin, $name) = pluginSplit($name);
if (!empty($plugin)) {
$plugin = Inflector::camelize($plugin);
if (!CakePlugin::loaded($plugin)) {
return false;
}
}

if (!$specialPackage) {
return self::_loadClass($name, $plugin, $type, $originalType, $parent);
}

if ($originalType == 'file' && !empty($file)) {
return self::_loadFile($name, $plugin, $search, $file, $return);
}

if ($originalType == 'vendor') {
return self::_loadVendor($name, $plugin, $file, $ext);
}

return false;
}

/**
* Helper function to include classes
* This is a compatibility wrapper around using App::uses() and automatic class loading
*
* @param string $name unique name of the file for identifying it inside the application
* @param string $plugin camel cased plugin name if any
* @param string $type name of the packed where the class is located
* @param string $file filename if known, the $name param will be used otherwise
* @param string $originalType type name as supplied initially by the user
* @param boolean $parent whether to load the class parent or not
* @return boolean true indicating the successful load and existence of the class
*/
private function _loadClass($name, $plugin, $type, $originalType, $parent) {
if ($type == 'Console/Command' && $name == 'Shell') {
$type = 'Console';
} else if (isset(self::$types[$originalType]['suffix'])) {
$suffix = self::$types[$originalType]['suffix'];
$name .= ($suffix == $name) ? '' : $suffix;
}
if ($parent && isset(self::$types[$originalType]['extends'])) {
$extends = self::$types[$originalType]['extends'];
$extendType = $type;
if (strpos($extends, '/') !== false) {
$parts = explode('/', $extends);
$extends = array_pop($parts);
$extendType = implode('/', $parts);
}
App::uses($extends, $extendType);
if ($plugin && in_array($originalType, array('controller', 'model'))) {
App::uses($plugin . $extends, $plugin . '.' .$type);
}
}
if ($plugin) {
$plugin .= '.';
}
$name = Inflector::camelize($name);
App::uses($name, $plugin . $type);
return class_exists($name);
}

/**
* Helper function to include single files
*
* @param string $name unique name of the file for identifying it inside the application
* @param string $plugin camel cased plugin name if any
* @param array $search list of paths to search the file into
* @param string $file filename if known, the $name param will be used otherwise
* @param boolean $return whether this function should return the contents of the file after being parsed by php or just a success notice
* @return mixed, if $return contents of the file after php parses it, boolean indicating success otherwise
*/
private function _loadFile($name, $plugin, $search, $file, $return) {
$mapped = self::__mapped($name, $plugin);
if ($mapped) {
$file = $mapped;
} else if (!empty($search)) {
foreach ($search as $path) {
$found = false;
if (file_exists($path . $file)) {
$file = $path . $file;
$found = true;
break;
}
if (empty($found)) {
$file = false;
}
}
}
if (!empty($file) && file_exists($file)) {
self::__map($file, $name, $plugin);
$returnValue = include $file;
if ($return) {
return $returnValue;
}
return (bool) $returnValue;
}
return false;
}

/**
* Helper function to load files from vendors folders
*
* @param string $name unique name of the file for identifying it inside the application
* @param string $plugin camel cased plugin name if any
* @param string $file file name if known
* @param string $ext file extension if known
* @return boolean true if the file was loaded successfully, false otherwise
*/
private function _loadVendor($name, $plugin, $file, $ext) {
if ($mapped = self::__mapped($name, $plugin)) {
return (bool) include_once($mapped);
}
$fileTries = array();
$paths = ($plugin) ? App::path('vendors', $plugin) : App::path('vendors');
if (empty($ext)) {
$ext = 'php';
}
if (empty($file)) {
$fileTries[] = $name . '.' . $ext;
$fileTries[] = Inflector::underscore($name) . '.' . $ext;
} else {
$fileTries[] = $file;
}

foreach ($fileTries as $file) {
foreach ($paths as $path) {
if (file_exists($path . $file)) {
self::__map($path . $file, $name, $plugin);
return (bool) include($path . $file);
}
}
}
return false;
}

/**
* Initializes the cache for App, registers a shutdown function.
*
* @return void
*/
public static function init() {
self::$__map = (array)Cache::read('file_map', '_cake_core_');
self::$__objects = (array)Cache::read('object_map', '_cake_core_');
register_shutdown_function(array('App', 'shutdown'));
self::uses('CakePlugin', 'Core');
}

/**
* Maps the $name to the $file.
*
* @param string $file full path to file
* @param string $name unique name for this map
* @param string $plugin camelized if object is from a plugin, the name of the plugin
* @return void
* @access private
*/
private static function __map($file, $name, $plugin = null) {
if ($plugin) {
self::$__map['Plugin'][$plugin][$name] = $file;
} else {
self::$__map[$name] = $file;
}
self::$_cacheChange = true;
}

/**
* Returns a file's complete path.
*
* @param string $name unique name
* @param string $plugin camelized if object is from a plugin, the name of the plugin
* @return mixed, file path if found, false otherwise
* @access private
*/
private static function __mapped($name, $plugin = null) {
if ($plugin) {
if (isset(self::$__map['Plugin'][$plugin][$name])) {
return self::$__map['Plugin'][$plugin][$name];
}
return false;
}

if (isset(self::$__map[$name])) {
return self::$__map[$name];
}
return false;
}

/**
* Object destructor.
*
* Writes cache file if changes have been made to the $__map or $__paths
*
* @return void
*/
public static function shutdown() {
if (self::$__cache && self::$_cacheChange) {
Cache::write('file_map', array_filter(self::$__map), '_cake_core_');
}
if (self::$__cache && self::$_objectCacheChange) {
Cache::write('object_map', self::$__objects, '_cake_core_');
}
}
}
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