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<?php |
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namespace smtech\StMarksSearch; |
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use Exception; |
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/** |
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* Require parameters |
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* |
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* @author Seth Battis <[email protected]> |
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*/ |
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trait RequireParameter |
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{ |
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/** |
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* Require that a specific parameter key exists (and optionally has a |
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* particular class as one of its parents) |
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* |
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* @param mixed[string] $params |
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* @param string $key |
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* @param string|false $class (Optional, defaults to `FALSE`) name of class |
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* to require as a parent |
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* @return void |
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* @throws Exception If the required parameter is not set (or does not |
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* have the correct parent class, if `$class` is specified) |
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*/ |
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protected function requireParameter($params, $key, $class = false) |
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{ |
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if (!isset($params[$key])) { |
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throw new Exception("`$key` param required"); |
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} |
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if ($class !== false && is_string($class)) { |
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if (!is_a($params[$key], $class)) { |
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throw new Exception( |
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"`$key` must be an instance of `$class`, instance of " . |
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get_class($params[$key]) . ' passed instead' |
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); |
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} |
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} |
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} |
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/** |
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* Force a boolean result from a particular parameter key |
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* |
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* @param mixed[string] $params |
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* @param string $key [description] |
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* @return boolean `TRUE` iff `$params[$key]` exists and has a true value |
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* (`1`, `'yes'`, `'true'`, `true`, etc.), `FALSE` |
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* otherwise. |
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*/ |
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protected function forceBooleanParameter($params, $key) |
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{ |
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return isset($params[$key]) && filter_var($params[$key], FILTER_VALIDATE_BOOLEAN); |
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} |
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/** |
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* Set a parameter to a default value if it is not set |
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* |
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* @param mixed[string] $params |
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* @param string $key |
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* @param mixed $value |
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* @param string|false $class |
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* @return void |
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*/ |
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protected function defaultParameter(&$params, $key, $value, $class = false) |
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{ |
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try { |
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$this->requireParameter($params, $key, $class); |
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} catch (Exception $e) { |
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$params[$key] = $value; |
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} |
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} |
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} |
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