Complex classes like OrderItem 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 OrderItem, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 13 | class OrderItem extends OrderAttribute |
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| 14 | { |
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| 15 | /** |
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| 16 | * what variables are accessible through http://mysite.com/api/ecommerce/v1/OrderItem/. |
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| 17 | * |
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| 18 | * @var array |
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| 19 | */ |
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| 20 | private static $api_access = array( |
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| 21 | 'view' => array( |
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| 22 | 'InternalItemID', |
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| 23 | 'CalculatedTotal', |
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| 24 | 'TableTitle', |
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| 25 | 'TableSubTitleNOHTML', |
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| 26 | 'Name', |
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| 27 | 'TableValue', |
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| 28 | 'Quantity', |
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| 29 | 'BuyableID', |
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| 30 | 'BuyableClassName', |
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| 31 | 'Version', |
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| 32 | 'UnitPrice', |
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| 33 | 'Total', |
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| 34 | 'Order', |
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| 35 | ), |
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| 36 | ); |
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| 37 | |||
| 38 | /** |
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| 39 | * stardard SS variable. |
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| 40 | * |
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| 41 | * @var array |
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| 42 | */ |
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| 43 | private static $db = array( |
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| 44 | 'Quantity' => 'Double', |
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| 45 | 'BuyableID' => 'Int', |
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| 46 | 'BuyableClassName' => 'Varchar(60)', |
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| 47 | 'Version' => 'Int', |
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| 48 | ); |
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| 49 | |||
| 50 | /** |
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| 51 | * @var array |
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| 52 | * stardard SS definition |
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| 53 | */ |
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| 54 | private static $indexes = array( |
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| 55 | 'Quantity' => true, |
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| 56 | 'BuyableID' => true, |
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| 57 | 'BuyableClassName' => true, |
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| 58 | ); |
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| 59 | |||
| 60 | /** |
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| 61 | * @var array |
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| 62 | * stardard SS definition |
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| 63 | */ |
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| 64 | private static $casting = array( |
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| 65 | 'UnitPrice' => 'Currency', |
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| 66 | 'UnitPriceAsMoney' => 'Money', |
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| 67 | 'Total' => 'Currency', |
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| 68 | 'TotalAsMoney' => 'Money', |
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| 69 | 'InternalItemID' => 'Varchar', |
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| 70 | 'Link' => 'Varchar', |
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| 71 | 'AbsoluteLink' => 'Varchar', |
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| 72 | 'BuyableLink' => 'Varchar', |
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| 73 | 'BuyableExists' => 'Boolean', |
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| 74 | 'BuyableFullName' => 'Varchar', |
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| 75 | 'BuyableMoreDetails' => 'Varchar' |
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| 76 | ); |
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| 77 | |||
| 78 | ###################### |
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| 79 | ## CMS CONFIG ## |
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| 80 | ###################### |
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| 81 | |||
| 82 | /** |
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| 83 | * @var array |
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| 84 | * stardard SS definition |
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| 85 | */ |
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| 86 | private static $searchable_fields = array( |
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| 87 | 'OrderID' => array( |
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| 88 | 'field' => 'NumericField', |
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| 89 | 'title' => 'Order Number', |
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| 90 | ), |
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| 91 | //"TableTitle" => "PartialMatchFilter", |
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| 92 | //"UnitPrice", |
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| 93 | 'Quantity', |
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| 94 | //"Total" |
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| 95 | ); |
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| 96 | |||
| 97 | /** |
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| 98 | * @var array |
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| 99 | * stardard SS definition |
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| 100 | */ |
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| 101 | private static $field_labels = array( |
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| 102 | //@todo - complete |
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| 103 | ); |
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| 104 | |||
| 105 | /** |
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| 106 | * @var array |
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| 107 | * stardard SS definition |
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| 108 | */ |
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| 109 | private static $summary_fields = array( |
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| 110 | 'OrderID' => 'Order ID', |
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| 111 | 'BuyableFullName' => 'Item', |
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| 112 | 'BuyableMoreDetails' => 'Details ... ', |
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| 113 | 'UnitPrice' => 'Unit Price', |
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| 114 | 'Quantity' => 'Quantity', |
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| 115 | 'Total' => 'Total Price', |
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| 116 | ); |
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| 117 | |||
| 118 | /** |
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| 119 | * singular name of the object. it is recommended to override this |
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| 120 | * in any extensions of this class. |
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| 121 | * |
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| 122 | * @var string |
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| 123 | */ |
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| 124 | private static $singular_name = 'Order Item'; |
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| 125 | public function i18n_singular_name() |
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| 129 | |||
| 130 | /** |
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| 131 | * plural name of the object. it is recommended to override this |
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| 132 | * in any extensions of this class. |
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| 133 | * |
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| 134 | * @var string |
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| 135 | */ |
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| 136 | private static $plural_name = 'Order Items'; |
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| 137 | public function i18n_plural_name() |
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| 141 | |||
| 142 | /** |
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| 143 | * Standard SS variable. |
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| 144 | * |
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| 145 | * @var string |
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| 146 | */ |
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| 147 | private static $description = 'Any item that is added to an order and sits before the sub-total. '; |
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| 148 | |||
| 149 | /** |
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| 150 | * HACK: Versioned is BROKEN this method helps in fixing it. |
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| 151 | * Basically, in Versioned, you get a hard-coded error |
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| 152 | * when you retrieve an older version of a DataObject. |
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| 153 | * This method returns null if it does not exist. |
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| 154 | * |
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| 155 | * Idea is from Jeremy: https://github.com/burnbright/silverstripe-shop/blob/master/code/products/FixVersioned.php |
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| 156 | * |
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| 157 | * @param string $class |
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| 158 | * @param int $id |
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| 159 | * @param int $version |
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| 160 | * |
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| 161 | * @return DataObject | Null |
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| 162 | */ |
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| 163 | public static function get_version($class, $id, $version) |
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| 172 | |||
| 173 | /** |
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| 174 | * Standard SS method. |
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| 175 | * |
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| 176 | * @var string |
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| 177 | */ |
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| 178 | public function getCMSFields() |
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| 262 | |||
| 263 | /** |
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| 264 | * standard SS method. |
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| 265 | * |
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| 266 | * @param Member $member |
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| 267 | * |
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| 268 | * @return bool |
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| 269 | **/ |
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| 270 | public function canDelete($member = null) |
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| 274 | |||
| 275 | /** |
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| 276 | * Determine which properties on the DataObject are |
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| 277 | * searchable, and map them to their default {@link FormField} |
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| 278 | * representations. Used for scaffolding a searchform for {@link ModelAdmin}. |
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| 279 | * |
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| 280 | * Some additional logic is included for switching field labels, based on |
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| 281 | * how generic or specific the field type is. |
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| 282 | * |
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| 283 | * Used by {@link SearchContext}. |
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| 284 | * |
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| 285 | * @param array $_params |
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| 286 | * 'fieldClasses': Associative array of field names as keys and FormField classes as values |
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| 287 | * 'restrictFields': Numeric array of a field name whitelist |
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| 288 | * |
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| 289 | * @return FieldList |
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| 290 | */ |
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| 291 | public function scaffoldSearchFields($_params = null) |
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| 298 | |||
| 299 | /** |
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| 300 | * standard SS method. |
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| 301 | * |
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| 302 | * @param BuyableModel $buyable |
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| 303 | * @param float $quantity |
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| 304 | * |
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| 305 | * @return FieldList |
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| 306 | **/ |
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| 307 | public function addBuyableToOrderItem(BuyableModel $buyable, $quantity = 1) |
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| 314 | |||
| 315 | /** |
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| 316 | * used to return data for ajax. |
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| 317 | * |
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| 318 | * @param array |
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| 319 | * |
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| 320 | * @return array used to create JSON for AJAX |
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| 321 | **/ |
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| 322 | public function updateForAjax(array $js) |
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| 387 | |||
| 388 | /** |
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| 389 | * saves details about the Order Item before the order is submittted. |
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| 390 | * |
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| 391 | * @param bool $recalculate - run it, even if it has run already |
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| 392 | **/ |
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| 393 | public function runUpdate($recalculate = false) |
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| 417 | |||
| 418 | |||
| 419 | /** |
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| 420 | * Standard SS method. |
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| 421 | * If the quantity is zero then we set it to 1. |
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| 422 | * TODO: evaluate this rule. |
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| 423 | */ |
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| 424 | public function onBeforeWrite() |
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| 446 | |||
| 447 | /** |
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| 448 | * Standard SS method |
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| 449 | * the method below is very important... |
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| 450 | * We initialise the order once it has an OrderItem. |
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| 451 | */ |
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| 452 | public function onAfterWrite() |
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| 463 | |||
| 464 | /** |
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| 465 | * Check if two Order Items are the same. |
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| 466 | * Useful when adding two items to cart. |
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| 467 | * |
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| 468 | * @param OrderItem $orderItem |
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| 469 | * |
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| 470 | * @return bool |
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| 471 | **/ |
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| 472 | public function hasSameContent(OrderItem $orderItem) |
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| 480 | |||
| 481 | ###################### |
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| 482 | ## TEMPLATE METHODS ## |
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| 483 | ###################### |
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| 484 | |||
| 485 | protected static $calculated_buyable_price = array(); |
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| 486 | public static function reset_calculated_buyable_price() |
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| 490 | |||
| 491 | public function UnitPrice($recalculate = false) |
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| 518 | |||
| 519 | public function UnitPriceAsMoney($recalculate = false) |
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| 527 | |||
| 528 | /** |
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| 529 | * @param bool $recalculate - forces recalculation of price |
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| 530 | * |
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| 531 | * @return float |
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| 532 | */ |
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| 533 | public function Total($recalculate = false) |
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| 552 | |||
| 553 | /** |
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| 554 | * @param bool $recalculate - forces recalculation of price |
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| 555 | * |
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| 556 | * @return Money |
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| 557 | */ |
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| 558 | public function TotalAsMoney($recalculate = false) |
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| 566 | |||
| 567 | /** |
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| 568 | * Casted variable |
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| 569 | * returns InternalItemID from Buyable. |
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| 570 | */ |
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| 571 | public function InternalItemID() |
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| 581 | |||
| 582 | /** |
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| 583 | * @return Field (EcomQuantityField) |
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| 584 | **/ |
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| 585 | public function QuantityField() |
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| 589 | |||
| 590 | /** |
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| 591 | * @return Currency (DB Object) |
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| 592 | **/ |
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| 593 | public function TotalAsCurrencyObject() |
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| 597 | |||
| 598 | ########################## |
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| 599 | ## OTHER LOOKUP METHODS ## |
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| 600 | ########################## |
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| 601 | |||
| 602 | /** |
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| 603 | * @param int $orderID |
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| 604 | * |
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| 605 | */ |
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| 606 | public static function reset_price_has_been_fixed($orderID = 0) |
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| 610 | |||
| 611 | |||
| 612 | |||
| 613 | /** |
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| 614 | * Store for buyables. |
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| 615 | * We store this here to speed up things a little |
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| 616 | * Format is like this |
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| 617 | * Array( |
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| 618 | * 0 => Buyable (versioned) |
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| 619 | * 1 => Buyable (current) |
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| 620 | * );. |
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| 621 | * |
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| 622 | * @var array |
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| 623 | */ |
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| 624 | protected $tempBuyableStore = array(); |
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| 625 | |||
| 626 | /** |
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| 627 | * @param bool $current - is this a current one, or an older VERSION ? |
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| 628 | * |
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| 629 | * @return DataObject (Any type of Data Object that is buyable) |
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| 630 | **/ |
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| 631 | public function Buyable($current = false) |
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| 635 | |||
| 636 | /** |
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| 637 | * @param string $current - is this a current one, or an older VERSION ? |
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| 638 | * |
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| 639 | * @return DataObject (Any type of Data Object that is buyable) |
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| 640 | **/ |
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| 641 | public function getBuyable($current = '') |
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| 706 | |||
| 707 | /** |
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| 708 | * @alias for getBuyableTitle |
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| 709 | * @return string |
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| 710 | **/ |
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| 711 | public function BuyableTitle() |
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| 715 | |||
| 716 | /** |
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| 717 | * @return string |
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| 718 | **/ |
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| 719 | public function getBuyableTitle() |
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| 731 | |||
| 732 | /** |
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| 733 | * @alias for getBuyableLink |
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| 734 | * @return string |
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| 735 | */ |
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| 736 | public function BuyableLink() |
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| 740 | |||
| 741 | /** |
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| 742 | * |
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| 743 | * @return string |
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| 744 | */ |
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| 745 | public function getBuyableLink() |
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| 758 | |||
| 759 | /** |
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| 760 | * @alias for getBuyableExists |
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| 761 | * @return bool |
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| 762 | */ |
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| 763 | public function BuyableExists() |
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| 767 | |||
| 768 | /** |
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| 769 | * |
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| 770 | * @return bool |
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| 771 | */ |
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| 772 | public function getBuyableExists() |
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| 782 | |||
| 783 | |||
| 784 | /** |
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| 785 | * @alias for getBuyableFullName |
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| 786 | * @return String |
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| 787 | */ |
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| 788 | public function BuyableFullName() |
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| 792 | |||
| 793 | /** |
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| 794 | * @return String |
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| 795 | */ |
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| 796 | public function getBuyableFullName() |
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| 805 | |||
| 806 | /** |
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| 807 | * @alias for getBuyableMoreDetails |
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| 808 | * @return String |
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| 809 | */ |
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| 810 | public function BuyableMoreDetails() |
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| 814 | |||
| 815 | /** |
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| 816 | * @return String |
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| 817 | */ |
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| 818 | public function getBuyableMoreDetails() |
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| 832 | |||
| 833 | ########################## |
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| 834 | ## LINKS ## |
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| 835 | ########################## |
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| 836 | |||
| 837 | /** |
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| 838 | * @return string (URLSegment) |
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| 839 | **/ |
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| 840 | public function Link() |
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| 844 | |||
| 845 | /** |
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| 846 | * @return string (URLSegment) |
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| 847 | **/ |
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| 848 | public function getLink() |
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| 857 | |||
| 858 | /** |
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| 859 | * alias |
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| 860 | * @return string |
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| 861 | */ |
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| 862 | public function AbsoluteLink() |
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| 866 | |||
| 867 | /** |
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| 868 | * @return string |
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| 869 | */ |
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| 870 | public function getAbsoluteLink() |
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| 874 | |||
| 875 | /** |
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| 876 | * @return string (URLSegment) |
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| 877 | **/ |
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| 878 | public function CheckoutLink() |
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| 882 | |||
| 883 | ## Often Overloaded functions ## |
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| 884 | |||
| 885 | /** |
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| 886 | * @return string (URLSegment) |
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| 887 | **/ |
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| 888 | public function AddLink() |
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| 892 | |||
| 893 | /** |
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| 894 | * @return string (URLSegment) |
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| 895 | **/ |
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| 896 | public function IncrementLink() |
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| 900 | |||
| 901 | /** |
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| 902 | * @return string (URLSegment) |
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| 903 | **/ |
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| 904 | public function DecrementLink() |
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| 908 | |||
| 909 | /** |
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| 910 | * @return string (URLSegment) |
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| 911 | **/ |
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| 912 | public function RemoveLink() |
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| 916 | |||
| 917 | /** |
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| 918 | * @return string (URLSegment) |
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| 919 | **/ |
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| 920 | public function RemoveAllLink() |
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| 924 | |||
| 925 | /** |
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| 926 | * @return string (URLSegment) |
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| 927 | **/ |
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| 928 | public function RemoveAllAndEditLink() |
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| 932 | |||
| 933 | /** |
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| 934 | * @return string (URLSegment) |
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| 935 | **/ |
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| 936 | public function SetSpecificQuantityItemLink($quantity) |
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| 940 | |||
| 941 | /** |
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| 942 | * @Todo: do we still need this? |
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| 943 | * |
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| 944 | * @return array for use as get variables in link |
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| 945 | **/ |
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| 946 | protected function linkParameters() |
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| 958 | |||
| 959 | public function debug() |
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| 969 | } |
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| 970 |