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 API 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 API, and based on these observations, apply Extract Interface, too.
1 | <?php |
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5 | class API extends \Object |
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6 | { |
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7 | private static $excluded_data_objects = [ |
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8 | 'Image_Cached', |
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9 | 'PermissionRoleCode', |
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10 | 'LoginAttempt', |
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11 | 'MemberPassword', |
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12 | 'MemberPassword', |
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13 | 'SiteConfig' |
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14 | ]; |
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15 | |||
16 | private static $excluded_db_fields_types = [ |
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17 | 'DBField', |
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18 | 'Field', |
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19 | 'DBLocale', |
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20 | 'Locale', |
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21 | 'StringField', |
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22 | 'CompositeField', |
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23 | 'PrimaryKey', |
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24 | 'ForeignKey' |
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25 | ]; |
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26 | |||
27 | private static $additional_db_fields = [ |
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28 | 'ID', |
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29 | 'Created', |
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30 | 'LastEdited', |
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31 | 'ClassName' |
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32 | ]; |
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33 | |||
34 | protected $rootBaseClass = 'DataObject'; |
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35 | |||
36 | protected $myBaseClass = ''; |
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37 | |||
38 | protected $_data = null; |
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39 | |||
40 | private static $_my_singleton = []; |
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41 | |||
42 | public static function inst($myBaseClass = 'DataObject', $data) |
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43 | { |
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44 | if (! isset(self::$_my_singleton[$myBaseClass])) { |
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45 | self::$_my_singleton[$myBaseClass] = \Injector::inst()->get('SunnySideUp\BuildDataObject\API'); |
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46 | } |
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47 | self::$_my_singleton[$myBaseClass]->_data = $data; |
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48 | self::$_my_singleton[$myBaseClass]->setBaseClass($myBaseClass); |
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49 | |||
50 | return self::$_my_singleton[$myBaseClass]; |
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51 | } |
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52 | |||
53 | public function setBaseClass($myBaseClass) |
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54 | { |
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55 | $this->myBaseClass = $myBaseClass; |
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56 | } |
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57 | |||
58 | |||
59 | protected function retrieveDBFields($name) |
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60 | { |
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61 | $data = $this->_data; |
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62 | $ar = []; |
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63 | if (isset($data->$name)) { |
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64 | foreach ($data->$name as $data) { |
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65 | if ($data->Key && $data->Value) { |
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66 | $ar[$data->Key] = $data->Key; |
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67 | } |
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68 | } |
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69 | } |
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70 | |||
71 | return $ar; |
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72 | } |
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73 | |||
74 | protected $_dbfieldCache = []; |
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75 | |||
76 | public function DbFields() |
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77 | { |
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78 | if (count($this->_dbfieldCache) === 0) { |
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79 | $list = \ClassInfo::subclassesFor('DbField'); |
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80 | $newList = []; |
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81 | foreach ($list as $class) { |
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82 | if (substr($class, 0, 2) == 'DB') { |
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83 | $class = substr($class, 2, strlen($class)); |
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84 | } elseif (substr($class, 0, 3) == 'SS_') { |
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85 | $class = substr($class, 3, strlen($class)); |
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86 | } elseif ('Varchar' === $class) { |
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87 | $class = 'Varchar'; |
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88 | } elseif ('HTMLVarchar' === $class) { |
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89 | $class = 'HTMLVarchar(255)'; |
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90 | } elseif ('Enum' === $class) { |
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91 | $class = 'Enum(\\\'Foo,Bar\\\', \\\'FOO\\\')'; |
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92 | } elseif ('MultiEnum' === $class) { |
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93 | $class = 'MultiEnum(\\\'Foo,Bar\\\', \\\'FOO\\\')'; |
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94 | } |
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95 | if ( |
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96 | $class == 'DbField' || |
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97 | is_subclass_of($class, 'TestOnly') || |
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98 | in_array($class, $this->Config()->get('excluded_db_fields_types')) |
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99 | ) { |
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100 | //do nothing |
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101 | } else { |
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102 | $newList[$class] = $class; |
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103 | } |
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104 | } |
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105 | $this->_dbfieldCache = $newList; |
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106 | } |
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107 | |||
108 | return $this->_dbfieldCache; |
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109 | } |
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110 | |||
111 | public function MyDbFields() |
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115 | |||
116 | public function MyDbFieldsWithDefaults() |
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117 | { |
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118 | $list = $this->retrieveDBFields('db'); |
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119 | $toAdd = $this->Config()->get('additional_db_fields'); |
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120 | $toAdd = array_combine($toAdd, $toAdd); |
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121 | |||
122 | return $toAdd + $list; |
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123 | } |
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124 | |||
125 | public function mydbfieldsfancywithbelongswithbasicfields() |
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126 | { |
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127 | return $this->MyDbFieldsFancyWithBelongs(); |
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128 | } |
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129 | |||
130 | public function MyDbFieldsFancyWithBelongs() |
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134 | |||
135 | public function MyDbFieldsFancyWithoutBelongs($includeBelongs = false) |
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178 | |||
179 | public function MyDbFieldsAndHasOnes() |
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185 | |||
186 | public function MyDbFieldsAndHasOnesWithIDs() |
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197 | |||
198 | public function MyDbFieldsAndIndexes() |
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208 | |||
209 | public function MyAllFieldsWithBelongs() |
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213 | |||
214 | public function MyAllFieldsWithoutBelongs($includeBelongs = false) |
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230 | |||
231 | |||
232 | public function IndexOptions() |
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240 | |||
241 | public function RequiredOptions() |
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248 | |||
249 | |||
250 | public function PossibleRelationsWithBaseClass($rootClass = '') |
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251 | { |
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264 | |||
265 | protected $_classesCache = []; |
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266 | |||
267 | /** |
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268 | * |
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269 | * @return array |
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270 | */ |
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271 | public function PossibleRelations($rootClass = '') |
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301 | |||
302 | protected $_filtersCache = []; |
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303 | |||
304 | public function PossibleSearchFilters() |
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319 | |||
320 | protected $_modelAdmins = []; |
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321 | |||
322 | public function ModelAdminOptions() |
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343 | |||
344 | |||
345 | public function SortOptions() |
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352 | |||
353 | protected $_canOptions = null; |
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354 | |||
355 | public function CanOptions() |
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372 | |||
373 | |||
374 | |||
375 | /** |
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376 | * |
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377 | * @return array |
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378 | */ |
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379 | public function SiteTreeList($rootClass = 'SiteTree') |
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400 | |||
401 | |||
402 | /** |
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403 | * |
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404 | * @return array |
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405 | */ |
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406 | public function AllowedChildrenOptions($rootClass = 'SiteTree') |
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410 | |||
411 | /** |
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412 | * |
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413 | * @return array |
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414 | */ |
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415 | public function TrueOrFalseListWithIgnore() |
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422 | |||
423 | /** |
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424 | * |
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425 | * @return array |
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426 | */ |
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427 | public function TrueOrFalseList() |
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434 | } |
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435 |
This check marks private properties in classes that are never used. Those properties can be removed.