Complex classes like Advertisement 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 Advertisement, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 8 | class Advertisement extends DataObject |
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| 9 | { |
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| 10 | /** |
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| 11 | * |
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| 12 | * @var int |
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| 13 | */ |
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| 14 | private static $thumbnail_size = 140; |
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| 15 | |||
| 16 | /** |
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| 17 | * |
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| 18 | * @var int |
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| 19 | */ |
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| 20 | private static $width = 0; |
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| 21 | |||
| 22 | /** |
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| 23 | * |
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| 24 | * @var int |
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| 25 | */ |
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| 26 | private static $height = 0; |
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| 27 | |||
| 28 | /** |
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| 29 | * |
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| 30 | * @var bool |
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| 31 | */ |
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| 32 | private static $show_title = false; |
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| 33 | |||
| 34 | /** |
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| 35 | * |
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| 36 | * @var bool |
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| 37 | */ |
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| 38 | private static $show_description = false; |
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| 39 | |||
| 40 | /** |
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| 41 | * must be a string as booleans dont work well on configs |
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| 42 | * @varchar yes / no |
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| 43 | */ |
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| 44 | private static $resize_images = "yes"; |
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| 45 | |||
| 46 | /** |
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| 47 | * |
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| 48 | * @return string |
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| 49 | */ |
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| 50 | public static function recommended_image_size_statement() |
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| 66 | |||
| 67 | |||
| 68 | private static $db = array( |
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| 69 | "Title" => "Varchar(255)", |
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| 70 | "ExternalLink" => "Varchar(150)", |
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| 71 | "Description" => "Text", |
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| 72 | "Sort" => "Int" |
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| 73 | ); |
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| 74 | |||
| 75 | private static $has_one = array( |
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| 76 | "AdvertisementImage" => "Image", |
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| 77 | "LinkedPage" => "SiteTree", |
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| 78 | "AdditionalImage" => "Image" |
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| 79 | ); |
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| 80 | |||
| 81 | private static $belongs_many_many = array( |
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| 82 | "Parents" => "SiteTree", |
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| 83 | ); |
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| 84 | |||
| 85 | private static $casting = array( |
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| 86 | "FullTitle" => "HTMLText", |
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| 87 | "Link" => "Varchar", |
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| 88 | "GroupID" => "Int" |
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| 89 | ); |
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| 90 | |||
| 91 | private static $defaults = array( |
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| 92 | "Sort" => 1000 |
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| 93 | ); |
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| 94 | |||
| 95 | private static $default_sort = "\"Sort\" ASC, \"Title\" ASC"; |
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| 96 | |||
| 97 | private static $searchable_fields = array( |
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| 98 | "Title" => "PartialMatchFilter" |
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| 99 | ); |
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| 100 | |||
| 101 | private static $singular_name = "Advertisement"; |
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| 102 | |||
| 103 | private static $plural_name = "Advertisements"; |
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| 104 | |||
| 105 | private static $summary_fields = array( |
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| 106 | "FullTitle" => "Image", |
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| 107 | "Link" => "Link" |
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| 108 | ); |
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| 109 | |||
| 110 | |||
| 111 | /** |
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| 112 | * @alias getLink |
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| 113 | * @return string |
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| 114 | */ |
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| 115 | public function Link() |
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| 119 | |||
| 120 | |||
| 121 | /** |
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| 122 | * |
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| 123 | * @return string |
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| 124 | */ |
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| 125 | public function getLink() |
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| 137 | |||
| 138 | |||
| 139 | /** |
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| 140 | * |
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| 141 | * @return HTMLText |
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| 142 | */ |
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| 143 | public function getFullTitle() |
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| 157 | |||
| 158 | /** |
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| 159 | * |
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| 160 | * @return HTMLText |
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| 161 | */ |
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| 162 | public function FullTitle() |
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| 166 | |||
| 167 | /** |
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| 168 | * |
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| 169 | * @return int | null |
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| 170 | */ |
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| 171 | public function getGroupID() |
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| 180 | |||
| 181 | /** |
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| 182 | * |
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| 183 | * @return int | null |
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| 184 | */ |
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| 185 | public function GroupID() |
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| 189 | |||
| 190 | public function getCMSFields() |
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| 256 | |||
| 257 | public function onBeforeWrite() |
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| 265 | |||
| 266 | |||
| 267 | public function requireDefaultRecords() |
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| 272 | |||
| 273 | |||
| 274 | /** |
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| 275 | * |
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| 276 | * @return bool |
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| 277 | */ |
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| 278 | protected function callbackFilterFunctionForMultiSelect() |
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| 293 | |||
| 294 | public function Image() |
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| 299 | |||
| 300 | /** |
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| 301 | * |
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| 302 | * @return Image | null |
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| 303 | */ |
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| 304 | public function ResizedAdvertisementImage() |
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| 341 | |||
| 342 | public function ThinyThumb() |
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| 346 | |||
| 347 | /** |
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| 348 | * |
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| 349 | * @return bool |
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| 350 | */ |
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| 351 | public function ShowTitle() |
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| 355 | |||
| 356 | /** |
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| 357 | * |
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| 358 | * @return bool |
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| 359 | */ |
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| 360 | public function ShowDescription() |
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| 364 | |||
| 365 | } |
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| 366 |
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.