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 | |||
| 8 | private static $excluded_data_objects = [ |
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| 9 | 'Image_Cached', |
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| 10 | 'PermissionRoleCode', |
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| 11 | 'LoginAttempt', |
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| 12 | 'MemberPassword', |
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| 13 | 'MemberPassword', |
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| 14 | 'SiteConfig' |
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| 15 | ]; |
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| 16 | |||
| 17 | private static $excluded_db_fields_types = [ |
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| 18 | 'DBField', |
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| 19 | 'Field', |
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| 20 | 'DBLocale', |
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| 21 | 'Locale', |
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| 22 | 'StringField', |
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| 23 | 'CompositeField', |
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| 24 | 'PrimaryKey', |
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| 25 | 'ForeignKey' |
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| 26 | ]; |
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| 27 | |||
| 28 | private static $additional_db_fields = [ |
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| 29 | 'ID', |
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| 30 | 'Created', |
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| 31 | 'LastEdited', |
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| 32 | 'ClassName' |
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| 33 | ]; |
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| 34 | |||
| 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($class)); |
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| 84 | } |
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| 85 | if(substr($class, 0, 3) == 'SS_') { |
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| 86 | $class = substr($class, 3, strlen($class)); |
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| 87 | } |
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| 88 | if('Varchar' === $class) { |
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| 89 | $class = 'Varchar(n)'; |
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| 90 | } |
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| 91 | if('HTMLVarchar' === $class) { |
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| 92 | $class = 'HTMLVarchar(n)'; |
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| 93 | } |
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| 94 | if('Enum' === $class) { |
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| 95 | $class = 'Enum(\\\'Foo,Bar\\\', \\\'FOO\\\')'; |
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| 96 | } |
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| 97 | if('MultiEnum' === $class) { |
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| 98 | $class = 'MultiEnum(\\\'Foo,Bar\\\', \\\'FOO\\\')'; |
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| 99 | } |
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| 100 | if( |
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| 101 | $class == 'DbField' || |
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| 102 | is_subclass_of($class, 'TestOnly') || |
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| 103 | in_array($class, $this->Config()->get('excluded_db_fields_types')) |
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| 104 | ) { |
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| 105 | //do nothing |
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| 106 | } else { |
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| 107 | $newList[$class] = $class; |
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| 108 | } |
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| 109 | } |
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| 110 | ksort($newList); |
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| 111 | $this->_dbfieldCache = $newList; |
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| 112 | } |
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| 113 | |||
| 114 | return $this->_dbfieldCache; |
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| 115 | } |
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| 116 | |||
| 117 | public function MyDbFields() |
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| 118 | { |
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| 119 | return $this->retrieveDBFields('db'); |
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| 120 | } |
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| 121 | |||
| 122 | public function MyDbFieldsWithDefaults() |
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| 123 | { |
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| 124 | $list = $this->retrieveDBFields('db'); |
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| 125 | $toAdd = $this->Config()->get('additional_db_fields') |
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| 126 | $toAdd = array_combine($toAdd, $toAdd); |
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| 127 | |||
| 128 | return $toAdd + $list; |
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| 129 | } |
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| 130 | |||
| 131 | public function MyDbFieldsFancyWithBelongs() |
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| 132 | { |
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| 133 | return $this->myDbFieldsFancyWithoutBelongs(true); |
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| 134 | } |
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| 135 | |||
| 136 | public function MyDbFieldsFancyWithoutBelongs($includeBelongs = false) |
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| 137 | { |
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| 138 | $ar = []; |
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| 139 | $list = $this->retrieveDBFields('db'); |
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| 140 | foreach($list as $key => $value) { |
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| 141 | $ar[$key] = $key; |
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| 142 | $shortValue = explode('(',$value); |
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| 143 | $shortValue = $shortValue[0]; |
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| 144 | switch($shortValue) { |
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| 145 | case 'Varchar': |
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| 146 | case 'HTMLTextField': |
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| 147 | case 'HTMLVarchar': |
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| 148 | case 'Text': |
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| 149 | $ar[$key.'.LimitCharacters'] = $key.'.LimitCharacters'; |
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| 150 | break; |
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| 151 | default: |
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| 152 | $ar[$key.'.Nice'] = $key.'.Nice'; |
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| 153 | } |
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| 154 | } |
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| 155 | $list = []; |
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| 156 | if($includeBelongs) { |
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| 157 | $list += $this->retrieveDBFields('belongs_to'); |
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| 158 | } |
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| 159 | $list += $this->retrieveDBFields('has_one'); |
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| 160 | foreach($list as $key => $value) { |
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| 161 | if($value === 'Image' || is_subclass_of($value, 'Image')) { |
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| 162 | $ar[$key.'.Thumbnail'] = $key.'.Thumbnail'; |
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| 163 | } else { |
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| 164 | $ar[$key.'.Title'] = $key.'.Title'; |
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| 165 | } |
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| 166 | } |
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| 167 | $list = |
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| 168 | $this->retrieveDBFields('has_many') + |
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| 169 | $this->retrieveDBFields('many_many'); |
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| 170 | if($includeBelongs) { |
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| 171 | $list += $this->retrieveDBFields('belongs_many_many'); |
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| 172 | } |
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| 173 | foreach($list as $key => $value) { |
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| 174 | $ar[$key.'.Count'] = $key.'.Count'; |
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| 175 | } |
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| 176 | |||
| 177 | return $ar; |
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| 178 | } |
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| 179 | |||
| 180 | public function MyDbFieldsAndHasOnes() |
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| 181 | { |
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| 182 | return |
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| 183 | $this->retrieveDBFields('db') + |
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| 184 | $this->retrieveDBFields('has_one'); |
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| 185 | } |
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| 186 | |||
| 187 | public function MyDbFieldsAndHasOnesWithIDs() |
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| 188 | { |
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| 189 | $list = $this->retrieveDBFields('db'); |
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| 190 | $hasOnes = $this->retrieveDBFields('has_one'); |
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| 191 | foreach($hasOnes as $field => $type) { |
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| 192 | $fieldWithID = $field . 'ID'; |
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| 193 | $list[$fieldWithID] = $fieldWithID; |
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| 194 | } |
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| 195 | |||
| 196 | return $list; |
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| 197 | } |
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| 198 | |||
| 199 | public function MyDbFieldsAndIndexes() |
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| 200 | { |
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| 201 | return |
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| 202 | $this->MyDbFieldsWithDefaults() + |
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| 203 | ['index1' => 'index1'] + |
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| 204 | ['index2' => 'index2'] + |
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| 205 | ['index3' => 'index3'] + |
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| 206 | ['index4' => 'index4'] + |
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| 207 | ['index5' => 'index5']; |
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| 208 | } |
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| 209 | |||
| 210 | public function MyAllFieldsWithBelongs() |
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| 211 | { |
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| 212 | return $this->myAllFieldsWithoutBelongs(true); |
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| 213 | } |
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| 214 | |||
| 215 | public function MyAllFieldsWithoutBelongs($includeBelongs = false) |
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| 216 | { |
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| 217 | $list = $this->MyDbFieldsWithDefaults(); |
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| 218 | if($includeBelongs) { |
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| 219 | $list += $this->retrieveDBFields('belongs_to'); |
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| 220 | } |
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| 221 | $list += |
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| 222 | $this->retrieveDBFields('has_one') + |
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| 223 | $this->retrieveDBFields('has_many') + |
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| 224 | $this->retrieveDBFields('many_many'); |
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| 225 | if($includeBelongs) { |
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| 226 | $list += $this->retrieveDBFields('belongs_many_many'); |
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| 227 | } |
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| 228 | |||
| 229 | return $list; |
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| 230 | } |
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| 231 | |||
| 232 | |||
| 233 | public function IndexOptions() |
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| 234 | { |
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| 235 | return [ |
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| 236 | 'true' => 'true', |
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| 237 | 'unique("<column-name>")' => 'unique', |
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| 238 | '[\'type\' => \'<type>\', \'value\' => \'"<column-name>"\']' => 'other' |
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| 239 | ]; |
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| 240 | } |
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| 241 | |||
| 242 | public function RequiredOptions() |
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| 243 | { |
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| 244 | return [ |
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| 245 | 'true' => 'true', |
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| 246 | 'unique' => 'unique' |
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| 247 | ]; |
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| 248 | } |
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| 249 | |||
| 250 | |||
| 251 | public function PossibleRelationsWithBaseClass() { |
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| 252 | return |
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| 253 | [$this->myBaseClass => $this->myBaseClass] + |
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| 254 | $this->possibleRelations(); |
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| 255 | } |
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| 256 | |||
| 257 | protected $_classesCache = []; |
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| 258 | |||
| 259 | public function PossibleRelations() |
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| 260 | { |
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| 261 | if(count($this->_classesCache) === 0) { |
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| 262 | $list = \ClassInfo::subclassesFor($this->myBaseClass); |
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| 263 | $newList = []; |
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| 264 | $newList = []; |
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| 265 | foreach($list as $class) { |
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| 266 | if( |
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| 267 | $class == $this->myBaseClass || |
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| 268 | is_subclass_of($class, 'TestOnly') || |
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| 269 | in_array($class, $this->Config()->get('excluded_data_objects')) |
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| 270 | ) { |
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| 271 | //do nothing |
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| 272 | } else { |
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| 273 | $newList[$class] = $class; |
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| 274 | $name = \Injector::inst()->get($class)->singular_name(); |
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| 275 | if($name !== $class) { |
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| 276 | $newList[$class] .= ' ('.$name.')'; |
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| 277 | } |
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| 278 | } |
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| 279 | } |
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| 280 | $this->_classesCache = $newList; |
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| 281 | } |
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| 282 | |||
| 283 | return $this->_classesCache; |
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| 284 | } |
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| 285 | |||
| 286 | protected $_filtersCache = []; |
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| 287 | |||
| 288 | public function PossibleSearchFilters() |
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| 289 | { |
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| 290 | if(count($this->_filtersCache) === 0) { |
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| 291 | $list = \ClassInfo::subclassesFor('SearchFilter'); |
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| 292 | $newList = []; |
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| 293 | foreach($list as $class) { |
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| 294 | if($class !== 'SearchFilter') { |
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| 295 | $newList[$class] = $class; |
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| 296 | } |
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| 297 | } |
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| 298 | $this->_filtersCache = $newList; |
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| 299 | } |
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| 300 | |||
| 301 | return $this->_filtersCache; |
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| 302 | } |
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| 303 | |||
| 304 | protected $_modelAdmins = []; |
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| 305 | |||
| 306 | public function ModelAdminOptions() |
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| 307 | { |
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| 308 | if(count($this->_modelAdmins) === 0) { |
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| 309 | $list = \ClassInfo::subclassesFor('ModelAdmin'); |
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| 310 | $newList = []; |
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| 311 | foreach($list as $class) { |
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| 312 | if( |
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| 313 | $class == 'ModelAdmin' || |
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| 314 | is_subclass_of($class, 'TestOnly') |
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| 315 | ) { |
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| 316 | //do nothing |
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| 317 | } else { |
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| 318 | $newList[$class] = $class; |
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| 319 | } |
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| 320 | } |
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| 321 | $newList['tba'] = 'tba'; |
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| 322 | $this->_modelAdmins = $newList; |
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| 323 | } |
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| 324 | |||
| 325 | return $this->_modelAdmins; |
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| 326 | } |
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| 327 | |||
| 328 | |||
| 329 | public function SortOptions() |
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| 330 | { |
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| 331 | return [ |
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| 332 | 'ASC' => 'ASC', |
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| 333 | 'DESC' => 'DESC' |
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| 334 | ]; |
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| 335 | } |
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| 336 | |||
| 337 | protected $_canOptions = null; |
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| 338 | |||
| 339 | public function CanOptions() |
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| 340 | { |
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| 341 | if(! $this->_canOptions) { |
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| 342 | $ar = [ |
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| 343 | 'true' => 'always', |
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| 358 |
This check marks private properties in classes that are never used. Those properties can be removed.