class DataConvert

class DataConvert extends RulesActionBase {
    
    /**
     * {@inheritdoc}
     */
    public function refineContextDefinitions(array $selected_data) {
        if ($type = $this->getContextValue('target_type')) {
            $this->pluginDefinition['provides']['conversion_result']
                ->setDataType($type);
        }
    }
    
    /**
     * Executes the plugin.
     *
     * @param mixed $value
     *   The input value.
     * @param string $target_type
     *   The target type the value should be converted into.
     * @param string $rounding_behavior
     *   The behavior for rounding.
     */
    protected function doExecute($value, $target_type, $rounding_behavior = NULL) {
        // @todo Add support for objects implementing __toString().
        if (!is_scalar($value)) {
            throw new InvalidArgumentException('Only scalar values are supported.');
        }
        // Ensure valid contexts have been provided.
        // @todo check how this works. May need to use !empty to allow the selection
        // list to be used and give an empty value?
        if (isset($rounding_behavior) && $target_type != 'integer') {
            throw new InvalidArgumentException('A rounding behavior only makes sense with an integer target type.');
        }
        // First apply the rounding behavior if given.
        if (!empty($rounding_behavior)) {
            switch ($rounding_behavior) {
                case 'up':
                    $value = ceil($value);
                    break;
                case 'down':
                    $value = floor($value);
                    break;
                case 'round':
                    $value = round($value);
                    break;
                default:
                    throw new InvalidArgumentException("Unknown rounding behavior: {$rounding_behavior}");
            }
        }
        switch ($target_type) {
            case 'float':
                $result = floatval($value);
                break;
            case 'integer':
                $result = intval($value);
                break;
            case 'string':
                $result = strval($value);
                break;
            default:
                throw new InvalidArgumentException("Unknown target type: {$target_type}");
        }
        $this->setProvidedValue('conversion_result', $result);
    }

}