Complex classes like WC_Gateway_Stripe_Giropay often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use WC_Gateway_Stripe_Giropay, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 13 | class WC_Gateway_Stripe_Giropay extends WC_Stripe_Payment_Gateway { |
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| 14 | /** |
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| 15 | * Notices (array) |
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| 16 | * @var array |
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| 17 | */ |
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| 18 | public $notices = array(); |
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| 19 | |||
| 20 | /** |
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| 21 | * Is test mode active? |
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| 22 | * |
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| 23 | * @var bool |
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| 24 | */ |
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| 25 | public $testmode; |
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| 26 | |||
| 27 | /** |
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| 28 | * Alternate credit card statement name |
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| 29 | * |
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| 30 | * @var bool |
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| 31 | */ |
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| 32 | public $statement_descriptor; |
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| 33 | |||
| 34 | /** |
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| 35 | * API access secret key |
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| 36 | * |
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| 37 | * @var string |
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| 38 | */ |
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| 39 | public $secret_key; |
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| 40 | |||
| 41 | /** |
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| 42 | * Api access publishable key |
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| 43 | * |
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| 44 | * @var string |
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| 45 | */ |
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| 46 | public $publishable_key; |
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| 47 | |||
| 48 | /** |
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| 49 | * Should we store the users credit cards? |
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| 50 | * |
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| 51 | * @var bool |
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| 52 | */ |
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| 53 | public $saved_cards; |
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| 54 | |||
| 55 | /** |
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| 56 | * Constructor |
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| 57 | */ |
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| 58 | public function __construct() { |
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| 94 | |||
| 95 | /** |
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| 96 | * Checks to make sure environment is setup correctly to use this payment method. |
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| 97 | * |
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| 98 | * @since 4.0.0 |
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| 99 | * @version 4.0.0 |
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| 100 | */ |
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| 101 | public function check_environment() { |
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| 118 | |||
| 119 | /** |
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| 120 | * Checks the environment for compatibility problems. Returns a string with the first incompatibility |
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| 121 | * found or false if the environment has no problems. |
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| 122 | * |
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| 123 | * @since 4.0.0 |
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| 124 | * @version 4.0.0 |
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| 125 | */ |
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| 126 | public function get_environment_warning() { |
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| 135 | |||
| 136 | /** |
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| 137 | * Returns all supported currencies for this payment method. |
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| 138 | * |
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| 139 | * @since 4.0.0 |
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| 140 | * @version 4.0.0 |
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| 141 | * @return array |
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| 142 | */ |
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| 143 | public function get_supported_currency() { |
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| 148 | |||
| 149 | /** |
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| 150 | * Checks to see if all criteria is met before showing payment method. |
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| 151 | * |
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| 152 | * @since 4.0.0 |
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| 153 | * @version 4.0.0 |
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| 154 | * @return bool |
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| 155 | */ |
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| 156 | public function is_available() { |
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| 163 | |||
| 164 | /** |
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| 165 | * Get_icon function. |
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| 166 | * |
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| 167 | * @since 1.0.0 |
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| 168 | * @version 4.0.0 |
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| 169 | * @return string |
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| 170 | */ |
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| 171 | public function get_icon() { |
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| 180 | |||
| 181 | /** |
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| 182 | * payment_scripts function. |
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| 183 | * |
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| 184 | * Outputs scripts used for stripe payment |
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| 185 | * |
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| 186 | * @access public |
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| 187 | */ |
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| 188 | public function payment_scripts() { |
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| 196 | |||
| 197 | /** |
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| 198 | * Initialize Gateway Settings Form Fields. |
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| 199 | */ |
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| 200 | public function init_form_fields() { |
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| 203 | |||
| 204 | /** |
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| 205 | * Payment form on checkout page |
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| 206 | */ |
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| 207 | public function payment_fields() { |
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| 235 | |||
| 236 | /** |
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| 237 | * Creates the source for charge. |
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| 238 | * |
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| 239 | * @since 4.0.0 |
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| 240 | * @version 4.0.0 |
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| 241 | * @param object $order |
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| 242 | * @return mixed |
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| 243 | */ |
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| 244 | public function create_source( $order ) { |
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| 263 | |||
| 264 | /** |
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| 265 | * Process the payment |
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| 266 | * |
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| 267 | * @param int $order_id Reference. |
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| 268 | * @param bool $retry Should we retry on fail. |
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| 269 | * @param bool $force_save_source Force payment source to be saved. |
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| 270 | * |
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| 271 | * @throws Exception If payment will not be accepted. |
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| 272 | * |
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| 273 | * @return array|void |
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| 274 | */ |
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| 275 | public function process_payment( $order_id, $retry = true, $force_save_source = false ) { |
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| 328 | } |
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| 329 |
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.