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Add ability to create temporary Config copies

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This commit is contained in:
Hamish Friedlander 2013-02-27 13:27:40 +13:00
parent 6b986cb17d
commit 024a0b90a9
1 changed files with 30 additions and 2 deletions
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32
core/Config.php
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@ -163,16 +163,44 @@ class Config {
$_SINGLETONS['Config'] = $instance;
}
/**
* Make the newly active Config be a copy of the current active Config instance.
*
* You can then make changes to the configuration by calling update and remove on the new
* value returned by Config::inst(), and then discard those changes later by calling unnest
*/
static public function nest() {
$current = self::$instance;
$new = clone $current;
$new->nestedFrom = $current;
self::set_instance($new);
}
/**
* Change the active Config back to the Config instance the current active Config object
* was copied from
*/
static public function unnest() {
self::set_instance(self::$instance->nestedFrom);
}
protected $cache;
/**
* Empty construction, otherwise calling singleton('Config') (not the right way to get the current active config
* instance, but people might) gives an error
* Each copy of the Config object need's it's own cache, so changes don't leak through to other instances
*/
public function __construct() {
$this->cache = new Config_LRU();
}
public function __clone() {
$this->cache = clone $this->cache;
}
/** @var Config - The config instance this one was copied from when Config::nest() was called */
protected $nestedFrom = null;
/** @var [array] - Array of arrays. Each member is an nested array keyed as $class => $name => $value,
* where value is a config value to treat as the highest priority item */
protected $overrides = array();