/
TableRegistry.php
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/
TableRegistry.php
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<?php
/**
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since 3.0.0
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\ORM;
use Cake\Core\App;
use Cake\Datasource\ConnectionManager;
use Cake\Utility\Inflector;
use RuntimeException;
/**
* Provides a registry/factory for Table objects.
*
* This registry allows you to centralize the configuration for tables
* their connections and other meta-data.
*
* ### Configuring instances
*
* You may need to configure your table objects, using TableRegistry you can
* centralize configuration. Any configuration set before instances are created
* will be used when creating instances. If you modify configuration after
* an instance is made, the instances *will not* be updated.
*
* {{{
* TableRegistry::config('Users', ['table' => 'my_users']);
* }}}
*
* Configuration data is stored *per alias* if you use the same table with
* multiple aliases you will need to set configuration multiple times.
*
* ### Getting instances
*
* You can fetch instances out of the registry using get(). One instance is stored
* per alias. Once an alias is populated the same instance will always be returned.
* This is used to make the ORM use less memory and help make cyclic references easier
* to solve.
*
* {{{
* $table = TableRegistry::get('Users', $config);
* }}}
*
*/
class TableRegistry {
/**
* Configuration for aliases.
*
* @var array
*/
protected static $_config = [];
/**
* Instances that belong to the registry.
*
* @var array
*/
protected static $_instances = [];
/**
* Contains a list of Table objects that were created out of the
* built-in Table class. The list is indexed by table alias
*
* @var array
*/
protected static $_fallbacked = [];
/**
* Contains a list of options that were passed to get() method.
*
* @var array
*/
protected static $_options = [];
/**
* Stores a list of options to be used when instantiating an object
* with a matching alias.
*
* The options that can be stored are those that are recognized by `get()`
* If second argument is omitted, it will return the current settings
* for $alias.
*
* If no arguments are passed it will return the full configuration array for
* all aliases
*
* @param string $alias Name of the alias
* @param null|array $options list of options for the alias
* @return array The config data.
* @throws RuntimeException When you attempt to configure an existing table instance.
*/
public static function config($alias = null, $options = null) {
if ($alias === null) {
return static::$_config;
}
if (!is_string($alias)) {
return static::$_config = $alias;
}
if ($options === null) {
return isset(static::$_config[$alias]) ? static::$_config[$alias] : [];
}
if (isset(static::$_instances[$alias])) {
throw new RuntimeException(sprintf(
'You cannot configure "%s", it has already been constructed.',
$alias
));
}
return static::$_config[$alias] = $options;
}
/**
* Get a table instance from the registry.
*
* Tables are only created once until the registry is flushed.
* This means that aliases must be unique across your application.
* This is important because table associations are resolved at runtime
* and cyclic references need to be handled correctly.
*
* The options that can be passed are the same as in `Table::__construct()`, but the
* key `className` is also recognized.
*
* If $options does not contain `className` CakePHP will attempt to construct the
* class name based on the alias. For example 'Users' would result in
* `App\Model\Table\UsersTable` being attempted. If this class does not exist,
* then the default `Cake\ORM\Table` class will be used. By setting the `className`
* option you can define the specific class to use. This className can
* use a plugin short class reference.
*
* If you use a `$name` that uses plugin syntax only the name part will be used as
* key in the registry. This means that if two plugins, or a plugin and app provide
* the same alias, the registry will only store the first instance.
*
* If no `table` option is passed, the table name will be the underscored version
* of the provided $alias.
*
* If no `connection` option is passed the table's defaultConnectionName() method
* will be called to get the default connection name to use.
*
* @param string $name The alias name you want to get.
* @param array $options The options you want to build the table with.
* If a table has already been loaded the options will be ignored.
* @return \Cake\ORM\Table
* @throws RuntimeException When you try to configure an alias that already exists.
*/
public static function get($name, array $options = []) {
list(, $alias) = pluginSplit($name);
$exists = isset(static::$_instances[$alias]);
if ($exists && !empty($options)) {
if (static::$_options[$alias] !== $options) {
throw new RuntimeException(sprintf(
'You cannot configure "%s", it already exists in the registry.',
$alias
));
}
}
if ($exists) {
return static::$_instances[$alias];
}
static::$_options[$alias] = $options;
$options = ['alias' => $alias] + $options;
if (empty($options['className'])) {
$options['className'] = Inflector::camelize($name);
}
$className = App::className($options['className'], 'Model/Table', 'Table');
$options['className'] = $className ?: 'Cake\ORM\Table';
if (isset(static::$_config[$alias])) {
$options += static::$_config[$alias];
}
if (empty($options['connection'])) {
$connectionName = $options['className']::defaultConnectionName();
$options['connection'] = ConnectionManager::get($connectionName);
}
static::$_instances[$alias] = new $options['className']($options);
if ($options['className'] === 'Cake\ORM\Table') {
static::$_fallbacked[$alias] = static::$_instances[$alias];
}
return static::$_instances[$alias];
}
/**
* Check to see if an instance exists in the registry.
*
* Plugin names will be trimmed off of aliases as instances
* stored in the registry will be without the plugin name as well.
*
* @param string $alias The alias to check for.
* @return bool
*/
public static function exists($alias) {
list(, $alias) = pluginSplit($alias);
return isset(static::$_instances[$alias]);
}
/**
* Set an instance.
*
* @param string $alias The alias to set.
* @param \Cake\ORM\Table $object The table to set.
* @return \Cake\ORM\Table
*/
public static function set($alias, Table $object) {
return static::$_instances[$alias] = $object;
}
/**
* Clears the registry of configuration and instances.
*
* @return void
*/
public static function clear() {
static::$_instances = [];
static::$_config = [];
static::$_fallbacked = [];
}
/**
* Returns the list of tables that were created by this registry that could
* not be instantiated from a specific subclass. This method is useful for
* debugging common mistakes when setting up associations or created new table
* classes.
*
* @return array
*/
public static function genericInstances() {
return static::$_fallbacked;
}
}