Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like EditableFormField 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 EditableFormField, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 47 | class EditableFormField extends DataObject |
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| 48 | { |
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| 49 | |||
| 50 | /** |
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| 51 | * Set to true to hide from class selector |
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| 52 | * |
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| 53 | * @config |
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| 54 | * @var bool |
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| 55 | */ |
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| 56 | private static $hidden = false; |
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| 57 | |||
| 58 | /** |
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| 59 | * Define this field as abstract (not inherited) |
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| 60 | * |
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| 61 | * @config |
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| 62 | * @var bool |
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| 63 | */ |
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| 64 | private static $abstract = true; |
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| 65 | |||
| 66 | /** |
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| 67 | * Flag this field type as non-data (e.g. literal, header, html) |
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| 68 | * |
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| 69 | * @config |
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| 70 | * @var bool |
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| 71 | */ |
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| 72 | private static $literal = false; |
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| 73 | |||
| 74 | /** |
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| 75 | * Default sort order |
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| 76 | * |
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| 77 | * @config |
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| 78 | * @var string |
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| 79 | */ |
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| 80 | private static $default_sort = '"Sort"'; |
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| 81 | |||
| 82 | /** |
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| 83 | * A list of CSS classes that can be added |
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| 84 | * |
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| 85 | * @var array |
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| 86 | */ |
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| 87 | public static $allowed_css = array(); |
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| 88 | |||
| 89 | /** |
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| 90 | * @config |
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| 91 | * @var array |
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| 92 | */ |
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| 93 | private static $summary_fields = array( |
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| 94 | 'Title' |
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| 95 | ); |
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| 96 | |||
| 97 | /** |
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| 98 | * @config |
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| 99 | * @var array |
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| 100 | */ |
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| 101 | private static $db = array( |
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| 102 | "Name" => "Varchar", |
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| 103 | "Title" => "Varchar(255)", |
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| 104 | "Default" => "Varchar(255)", |
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| 105 | "Sort" => "Int", |
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| 106 | "Required" => "Boolean", |
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| 107 | "CustomErrorMessage" => "Varchar(255)", |
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| 108 | |||
| 109 | "CustomRules" => "Text", // @deprecated from 2.0 |
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| 110 | "CustomSettings" => "Text", // @deprecated from 2.0 |
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| 111 | "Migrated" => "Boolean", // set to true when migrated |
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| 112 | |||
| 113 | "ExtraClass" => "Text", // from CustomSettings |
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| 114 | "RightTitle" => "Varchar(255)", // from CustomSettings |
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| 115 | "ShowOnLoad" => "Boolean(1)", // from CustomSettings |
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| 116 | ); |
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| 117 | |||
| 118 | private static $defaults = array( |
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| 119 | 'ShowOnLoad' => true, |
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| 120 | ); |
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| 121 | |||
| 122 | |||
| 123 | /** |
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| 124 | * @config |
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| 125 | * @var array |
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| 126 | */ |
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| 127 | private static $has_one = array( |
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| 128 | "Parent" => "UserDefinedForm", |
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| 129 | ); |
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| 130 | |||
| 131 | /** |
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| 132 | * Built in extensions required |
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| 133 | * |
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| 134 | * @config |
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| 135 | * @var array |
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| 136 | */ |
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| 137 | private static $extensions = array( |
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| 138 | "SilverStripe\\ORM\\Versioning\\Versioned('Stage', 'Live')" |
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| 139 | ); |
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| 140 | |||
| 141 | /** |
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| 142 | * @config |
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| 143 | * @var array |
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| 144 | */ |
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| 145 | private static $has_many = array( |
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| 146 | "DisplayRules" => "EditableCustomRule.Parent" // from CustomRules |
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| 147 | ); |
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| 148 | |||
| 149 | /** |
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| 150 | * @var bool |
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| 151 | */ |
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| 152 | protected $readonly; |
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| 153 | |||
| 154 | /** |
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| 155 | * Set the visibility of an individual form field |
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| 156 | * |
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| 157 | * @param bool |
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| 158 | */ |
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| 159 | public function setReadonly($readonly = true) |
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| 163 | |||
| 164 | /** |
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| 165 | * Returns whether this field is readonly |
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| 166 | * |
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| 167 | * @return bool |
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| 168 | */ |
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| 169 | private function isReadonly() |
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| 173 | |||
| 174 | /** |
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| 175 | * @return FieldList |
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| 176 | */ |
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| 177 | public function getCMSFields() |
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| 261 | |||
| 262 | /** |
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| 263 | * Return fields to display on the 'Display Rules' tab |
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| 264 | * |
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| 265 | * @return FieldList |
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| 266 | */ |
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| 267 | protected function getDisplayRuleFields() |
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| 335 | |||
| 336 | public function onBeforeWrite() |
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| 355 | |||
| 356 | /** |
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| 357 | * Generate a new non-conflicting Name value |
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| 358 | * |
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| 359 | * @return string |
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| 360 | */ |
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| 361 | protected function generateName() |
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| 374 | |||
| 375 | /** |
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| 376 | * Flag indicating that this field will set its own error message via data-msg='' attributes |
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| 377 | * |
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| 378 | * @return bool |
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| 379 | */ |
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| 380 | public function getSetsOwnError() |
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| 384 | |||
| 385 | /** |
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| 386 | * Return whether a user can delete this form field |
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| 387 | * based on whether they can edit the page |
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| 388 | * |
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| 389 | * @param Member $member |
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| 390 | * @return bool |
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| 391 | */ |
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| 392 | public function canDelete($member = null) |
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| 396 | |||
| 397 | /** |
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| 398 | * Return whether a user can edit this form field |
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| 399 | * based on whether they can edit the page |
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| 400 | * |
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| 401 | * @param Member $member |
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| 402 | * @return bool |
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| 403 | */ |
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| 404 | public function canEdit($member = null) |
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| 428 | |||
| 429 | /** |
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| 430 | * Return whether a user can view this form field |
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| 431 | * based on whether they can view the page, regardless of the ReadOnly status of the field |
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| 432 | * |
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| 433 | * @param Member $member |
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| 434 | * @return bool |
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| 435 | */ |
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| 436 | public function canView($member = null) |
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| 445 | |||
| 446 | /** |
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| 447 | * Return whether a user can create an object of this type |
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| 448 | * |
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| 449 | * @param Member $member |
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| 450 | * @param array $context Virtual parameter to allow context to be passed in to check |
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| 451 | * @return bool |
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| 452 | */ |
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| 453 | View Code Duplication | public function canCreate($member = null, $context = array()) |
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| 464 | |||
| 465 | /** |
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| 466 | * Helper method to check the parent for this object |
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| 467 | * |
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| 468 | * @param array $args List of arguments passed to canCreate |
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| 469 | * @return SiteTree Parent page instance |
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| 470 | */ |
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| 471 | View Code Duplication | protected function getCanCreateContext($context) |
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| 485 | |||
| 486 | /** |
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| 487 | * Check if can publish |
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| 488 | * |
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| 489 | * @param Member $member |
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| 490 | * @return bool |
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| 491 | */ |
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| 492 | public function canPublish($member = null) |
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| 496 | |||
| 497 | /** |
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| 498 | * Check if can unpublish |
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| 499 | * |
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| 500 | * @param Member $member |
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| 501 | * @return bool |
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| 502 | */ |
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| 503 | public function canUnpublish($member = null) |
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| 507 | |||
| 508 | /** |
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| 509 | * Publish this Form Field to the live site |
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| 510 | * |
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| 511 | * Wrapper for the {@link Versioned} publish function |
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| 512 | */ |
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| 513 | public function doPublish($fromStage, $toStage, $createNewVersion = false) |
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| 522 | |||
| 523 | /** |
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| 524 | * Delete this field from a given stage |
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| 525 | * |
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| 526 | * Wrapper for the {@link Versioned} deleteFromStage function |
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| 527 | */ |
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| 528 | public function doDeleteFromStage($stage) |
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| 540 | |||
| 541 | /** |
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| 542 | * checks wether record is new, copied from Sitetree |
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| 543 | */ |
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| 544 | public function isNew() |
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| 556 | |||
| 557 | /** |
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| 558 | * checks if records is changed on stage |
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| 559 | * @return boolean |
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| 560 | */ |
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| 561 | public function getIsModifiedOnStage() |
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| 573 | |||
| 574 | /** |
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| 575 | * @deprecated since version 4.0 |
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| 576 | */ |
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| 577 | public function getSettings() |
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| 582 | |||
| 583 | /** |
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| 584 | * @deprecated since version 4.0 |
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| 585 | */ |
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| 586 | public function setSettings($settings = array()) |
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| 591 | |||
| 592 | /** |
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| 593 | * @deprecated since version 4.0 |
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| 594 | */ |
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| 595 | public function setSetting($key, $value) |
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| 603 | |||
| 604 | /** |
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| 605 | * Set the allowed css classes for the extraClass custom setting |
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| 606 | * |
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| 607 | * @param array The permissible CSS classes to add |
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| 608 | */ |
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| 609 | public function setAllowedCss(array $allowed) |
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| 617 | |||
| 618 | /** |
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| 619 | * @deprecated since version 4.0 |
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| 620 | */ |
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| 621 | public function getSetting($setting) |
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| 633 | |||
| 634 | /** |
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| 635 | * Get the path to the icon for this field type, relative to the site root. |
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| 636 | * |
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| 637 | * @return string |
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| 638 | */ |
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| 639 | public function getIcon() |
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| 643 | |||
| 644 | /** |
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| 645 | * Return whether or not this field has addable options |
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| 646 | * such as a dropdown field or radio set |
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| 647 | * |
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| 648 | * @return bool |
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| 649 | */ |
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| 650 | public function getHasAddableOptions() |
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| 654 | |||
| 655 | /** |
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| 656 | * Return whether or not this field needs to show the extra |
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| 657 | * options dropdown list |
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| 658 | * |
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| 659 | * @return bool |
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| 660 | */ |
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| 661 | public function showExtraOptions() |
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| 665 | |||
| 666 | /** |
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| 667 | * Returns the Title for rendering in the front-end (with XML values escaped) |
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| 668 | * |
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| 669 | * @return string |
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| 670 | */ |
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| 671 | public function getEscapedTitle() |
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| 675 | |||
| 676 | /** |
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| 677 | * Find the numeric indicator (1.1.2) that represents it's nesting value |
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| 678 | * |
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| 679 | * Only useful for fields attached to a current page, and that contain other fields such as pages |
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| 680 | * or groups |
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| 681 | * |
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| 682 | * @return string |
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| 683 | */ |
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| 684 | public function getFieldNumber() |
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| 715 | |||
| 716 | public function getCMSTitle() |
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| 720 | |||
| 721 | /** |
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| 722 | * @deprecated since version 4.0 |
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| 723 | */ |
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| 724 | public function getFieldName($field = false) |
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| 729 | |||
| 730 | /** |
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| 731 | * @deprecated since version 4.0 |
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| 732 | */ |
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| 733 | public function getSettingName($field) |
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| 740 | |||
| 741 | /** |
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| 742 | * Append custom validation fields to the default 'Validation' |
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| 743 | * section in the editable options view |
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| 744 | * |
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| 745 | * @return FieldList |
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| 746 | */ |
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| 747 | public function getFieldValidationOptions() |
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| 759 | |||
| 760 | /** |
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| 761 | * Return a FormField to appear on the front end. Implement on |
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| 762 | * your subclass. |
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| 763 | * |
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| 764 | * @return FormField |
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| 765 | */ |
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| 766 | public function getFormField() |
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| 770 | |||
| 771 | /** |
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| 772 | * Updates a formfield with extensions |
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| 773 | * |
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| 774 | * @param FormField $field |
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| 775 | */ |
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| 776 | public function doUpdateFormField($field) |
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| 782 | |||
| 783 | /** |
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| 784 | * Updates a formfield with the additional metadata specified by this field |
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| 785 | * |
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| 786 | * @param FormField $field |
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| 787 | */ |
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| 788 | protected function updateFormField($field) |
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| 818 | |||
| 819 | /** |
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| 820 | * Return the instance of the submission field class |
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| 821 | * |
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| 822 | * @return SubmittedFormField |
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| 823 | */ |
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| 824 | public function getSubmittedFormField() |
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| 828 | |||
| 829 | |||
| 830 | /** |
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| 831 | * Show this form field (and its related value) in the reports and in emails. |
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| 832 | * |
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| 833 | * @return bool |
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| 834 | */ |
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| 835 | public function showInReports() |
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| 839 | |||
| 840 | /** |
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| 841 | * Return the error message for this field. Either uses the custom |
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| 842 | * one (if provided) or the default SilverStripe message |
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| 843 | * |
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| 844 | * @return Varchar |
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| 845 | */ |
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| 846 | public function getErrorMessage() |
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| 856 | |||
| 857 | /** |
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| 858 | * Invoked by UserFormUpgradeService to migrate settings specific to this field from CustomSettings |
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| 859 | * to the field proper |
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| 860 | * |
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| 861 | * @param array $data Unserialised data |
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| 862 | */ |
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| 863 | public function migrateSettings($data) |
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| 878 | |||
| 879 | /** |
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| 880 | * Get the formfield to use when editing this inline in gridfield |
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| 881 | * |
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| 882 | * @param string $column name of column |
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| 883 | * @param array $fieldClasses List of allowed classnames if this formfield has a selectable class |
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| 884 | * @return FormField |
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| 885 | */ |
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| 886 | public function getInlineClassnameField($column, $fieldClasses) |
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| 890 | |||
| 891 | /** |
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| 892 | * Get the formfield to use when editing the title inline |
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| 893 | * |
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| 894 | * @param string $column |
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| 895 | * @return FormField |
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| 896 | */ |
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| 897 | public function getInlineTitleField($column) |
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| 903 | |||
| 904 | /** |
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| 905 | * Get the JS expression for selecting the holder for this field |
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| 906 | * |
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| 907 | * @return string |
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| 908 | */ |
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| 909 | public function getSelectorHolder() |
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| 913 | |||
| 914 | /** |
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| 915 | * Gets the JS expression for selecting the value for this field |
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| 916 | * |
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| 917 | * @param EditableCustomRule $rule Custom rule this selector will be used with |
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| 918 | * @param bool $forOnLoad Set to true if this will be invoked on load |
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| 919 | */ |
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| 920 | public function getSelectorField(EditableCustomRule $rule, $forOnLoad = false) |
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| 924 | |||
| 925 | |||
| 926 | /** |
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| 927 | * Get the list of classes that can be selected and used as data-values |
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| 928 | * |
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| 929 | * @param $includeLiterals Set to false to exclude non-data fields |
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| 930 | * @return array |
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| 931 | */ |
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| 932 | public function getEditableFieldClasses($includeLiterals = true) |
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| 960 | |||
| 961 | /** |
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| 962 | * @return EditableFormFieldValidator |
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| 963 | */ |
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| 964 | public function getCMSValidator() |
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| 969 | |||
| 970 | /** |
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| 971 | * Determine effective display rules for this field. |
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| 972 | * |
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| 973 | * @return SS_List |
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| 974 | */ |
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| 975 | public function EffectiveDisplayRules() |
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| 982 | } |
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| 983 |
Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: