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<?php |
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namespace luya\traits; |
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/** |
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* Registry Trait. |
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* |
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* The RegistryTrait helps to handle set(), get(), has() and remove() operations for a key value based storage. |
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* |
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* Can be attached to ActiveRecords with a `name` and `value` property where name is an unique identifier. |
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* |
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* @author Basil Suter <[email protected]> |
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* @since 1.0.0 |
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*/ |
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trait RegistryTrait |
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{ |
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/** |
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* Determines what attribute field in the corresponding model table should be used to find the identifier key. |
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* |
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* @return string The name attribute field defaults to `name`. |
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*/ |
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public static function getNameAttribute() |
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{ |
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return 'name'; |
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} |
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/** |
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* Determines what attribute field in the corresponding model table should be used to store the identifier key and retrieve its data. |
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* |
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* @return string The value attribute field defaults to `value`. |
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*/ |
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public static function getValueAttribute() |
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{ |
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return 'value'; |
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} |
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private static $_data; |
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/** |
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* Loads all config data into an array. |
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* |
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* @return array |
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* @since 1.3.0 |
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*/ |
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protected static function getData() |
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{ |
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if (self::$_data === null) { |
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self::$_data = self::find() |
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->select([self::getValueAttribute(), self::getNameAttribute()]) |
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->indexBy(self::getNameAttribute()) |
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->column(); |
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} |
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return self::$_data; |
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} |
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/** |
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* Clear data array. |
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* |
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* @since 1.3.0 |
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*/ |
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protected static function clearData() |
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{ |
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self::$_data = null; |
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} |
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/** |
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* Check whether a config value exists or not. |
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* |
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* If a value exists but is empty, has will return false. |
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* |
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* @param string $name The key to lookup. If not found false is returned. |
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* @return boolean Whether the key exists or not. |
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*/ |
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public static function has($name) |
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{ |
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return array_key_exists($name, self::getData()); |
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} |
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/** |
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* Get the value of a config value. |
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* |
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* Returns the value from the registry for the given $name, if not found the defaultValue is returned. |
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* |
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* @param string $name The key to lookup. |
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* @param mixed $defaultValue The default value to return if the key does not exist. |
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* @return mixed |
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*/ |
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public static function get($name, $defaultValue = null) |
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{ |
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if (self::has($name)) { |
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return self::getData()[$name]; |
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} |
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return $defaultValue; |
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} |
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/** |
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* Store or Update an existing/new config value. |
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* |
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* If the config value is not found, a new record will be created. |
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* |
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* @param string $name They config key |
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* @param string $value They config value. When working with array data, encode the data first with Json::encode. |
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* @return boolean Whether saving was successfull or not. |
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*/ |
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public static function set($name, $value) |
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{ |
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$model = self::find()->where([self::getNameAttribute() => $name])->one(); |
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self::clearData(); |
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if ($model) { |
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return (bool) $model->updateAttributes([ |
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self::getValueAttribute() => $value, |
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]); |
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} |
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$model = new self(); |
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$model->value = $value; |
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$model->name = $name; |
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return $model->save(); |
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} |
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/** |
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* Remove an existing config value. |
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* |
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* If the value is not found in the config, false is returned. |
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* |
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* @param string $name The key to remove. |
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* @return bool If element was found and deleting was successfull true is returned, otherwise false. |
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*/ |
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public static function remove($name) |
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{ |
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$model = self::find()->where([self::getNameAttribute() => $name])->one(); |
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if ($model) { |
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self::clearData(); |
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return (bool) $model->delete(); |
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} |
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return false; |
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} |
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} |
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: