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<?php |
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namespace Consolidation\Config; |
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/** |
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* Overlay different configuration objects that implement ConfigInterface |
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* to make a priority-based, merged configuration object. |
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* |
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* Note that using a ConfigOverlay hides the defaults stored in each |
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* individual configuration context. When using overlays, always call |
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* getDefault / setDefault on the ConfigOverlay object itself. |
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*/ |
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class ConfigOverlay implements ConfigInterface |
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{ |
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protected $contexts = []; |
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const DEFAULT_CONTEXT = 'default'; |
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const PROCESS_CONTEXT = 'process'; |
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public function __construct() |
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{ |
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$this->contexts[self::DEFAULT_CONTEXT] = new Config(); |
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$this->contexts[self::PROCESS_CONTEXT] = new Config(); |
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} |
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/** |
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* Add a named configuration object to the configuration overlay. |
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* Configuration objects added LAST have HIGHEST priority, with the |
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* exception of the fact that the process context always has the |
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* highest priority. |
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* |
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* If a context has already been added, its priority will not change. |
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*/ |
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public function addContext($name, ConfigInterface $config) |
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{ |
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$process = $this->contexts[self::PROCESS_CONTEXT]; |
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unset($this->contexts[self::PROCESS_CONTEXT]); |
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$this->contexts[$name] = $config; |
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$this->contexts[self::PROCESS_CONTEXT] = $process; |
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return $this; |
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} |
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/** |
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* Add a placeholder context that will be prioritized higher than |
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* existing contexts. This is done to ensure that contexts added |
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* later will maintain a higher priority if the placeholder context |
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* is later relaced with a different configuration set via addContext(). |
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* |
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* @param string $name |
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* @return $this |
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*/ |
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public function addPlaceholder($name) |
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{ |
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return $this->addContext($name, new Config()); |
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} |
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/** |
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* Increase the priority of the named context such that it is higher |
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* in priority than any existing context except for the 'process' |
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* context. |
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* |
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* @param string $name |
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* @return $this |
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*/ |
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public function increasePriority($name) |
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{ |
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$config = $this->getContext($name); |
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unset($this->contexts[$name]); |
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return $this->addContext($name, $config); |
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} |
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public function hasContext($name) |
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{ |
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return isset($this->contexts[$name]); |
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} |
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public function getContext($name) |
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{ |
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if ($this->hasContext($name)) { |
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return $this->contexts[$name]; |
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} |
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return new Config(); |
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} |
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public function removeContext($name) |
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{ |
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unset($this->contexts[$name]); |
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} |
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/** |
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* Determine if a non-default config value exists. |
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*/ |
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public function findContext($key) |
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{ |
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foreach (array_reverse($this->contexts) as $name => $config) { |
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if ($config->has($key)) { |
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return $config; |
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} |
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} |
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return false; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function has($key) |
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{ |
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return $this->findContext($key) != false; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function get($key, $default = null) |
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{ |
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$context = $this->findContext($key); |
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if ($context) { |
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return $context->get($key, $default); |
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} |
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return $default; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function set($key, $value) |
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{ |
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$this->contexts[self::PROCESS_CONTEXT]->set($key, $value); |
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return $this; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function import($data) |
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{ |
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throw new \Exception('The method "import" is not supported for the ConfigOverlay class.'); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function export() |
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{ |
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$export = []; |
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foreach ($this->contexts as $name => $config) { |
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$export = array_merge_recursive($export, $config->export()); |
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} |
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return $export; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function hasDefault($key) |
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{ |
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return $this->contexts[self::DEFAULT_CONTEXT]->has($key); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function getDefault($key, $default = null) |
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{ |
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return $this->contexts[self::DEFAULT_CONTEXT]->get($key, $default); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function setDefault($key, $value) |
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{ |
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$this->contexts[self::DEFAULT_CONTEXT]->set($key, $value); |
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return $this; |
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} |
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} |
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consolidation /
config
