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:
| 1 | <?php |
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| 21 | trait SetterTrait |
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| 22 | { |
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| 23 | /** |
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| 24 | * Set permission. |
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| 25 | * @param string $name |
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| 26 | * @param string $description |
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| 27 | * @return Item |
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| 28 | */ |
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| 29 | 7 | public function setPermission($name, $description = null) |
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| 39 | |||
| 40 | /** |
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| 41 | * Set role. |
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| 42 | * @param string $name |
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| 43 | * @param string $description |
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| 44 | * @return Item |
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| 45 | */ |
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| 46 | 7 | public function setRole($name, $description = null) |
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| 56 | |||
| 57 | /** |
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| 58 | * Set child. |
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| 59 | * @param string|Item $parent |
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| 60 | * @param string|Item $child |
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| 61 | * @return bool |
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| 62 | */ |
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| 63 | 7 | public function setChild($parent, $child) |
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| 64 | { |
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| 65 | 7 | View Code Duplication | if (is_string($parent)) { |
| 66 | 7 | $name = $parent; |
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| 67 | 7 | $parent = $this->getItem($parent); |
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| 68 | 7 | if (is_null($parent)) { |
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| 69 | throw new InvalidParamException("Unknown parent:$name at setChild"); |
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| 70 | } |
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| 71 | 7 | } |
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| 72 | 7 | View Code Duplication | if (is_string($child)) { |
| 73 | $name = $child; |
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| 74 | $child = $this->getItem($child); |
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| 75 | if (is_null($child)) { |
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| 76 | throw new InvalidParamException("Unknown child:$name at setChild"); |
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| 77 | } |
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| 78 | } |
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| 79 | 7 | if (isset($this->children[$parent->name][$child->name])) { |
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| 80 | return false; |
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| 81 | } |
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| 82 | |||
| 83 | 7 | return $this->addChild($parent, $child); |
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| 84 | } |
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| 85 | |||
| 86 | /** |
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| 87 | * Assigns an item (role or permission) to a user. |
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| 88 | * @param string|Item $item |
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| 89 | * @param string|integer $userId the user ID (see [[\yii\web\User::id]]) |
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| 90 | * @throws \Exception when given wrong item name |
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| 91 | * @return Assignment the assignment object |
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| 92 | */ |
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| 93 | 14 | public function setAssignment($item, $userId) |
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| 94 | { |
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| 95 | 14 | if (is_string($item)) { |
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| 96 | 14 | $item = $this->findItem($item); |
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| 97 | 14 | } |
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| 98 | 14 | if (isset($this->assignments[$userId][$item->name])) { |
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| 99 | return $this->assignments[$userId][$item->name]; |
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| 100 | } |
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| 101 | |||
| 102 | 14 | return $this->assign($item, $userId); |
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| 103 | } |
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| 104 | |||
| 105 | 14 | protected function findItem($name, $description = null) |
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| 117 | |||
| 118 | /** |
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| 119 | * Assigns items to a user. |
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| 120 | * @param string|array $items |
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| 121 | * @param string|integer $userId |
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| 122 | */ |
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| 123 | 4 | public function setAssignments($items, $userId) |
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| 124 | { |
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| 125 | 4 | if (is_string($items)) { |
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| 126 | 4 | $items = explode(',', $items); |
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| 127 | 4 | } |
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| 128 | 4 | foreach ($items as $item) { |
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| 129 | 4 | $this->setAssignment($item, $userId); |
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| 130 | 4 | } |
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| 131 | 4 | } |
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| 132 | |||
| 133 | /** |
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| 134 | * Returns all assignments in the system. |
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| 135 | * @return array |
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| 136 | */ |
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| 137 | public function getAllAssignments() |
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| 141 | |||
| 142 | /** |
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| 143 | * Returns all items in the system. |
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| 144 | * @return array |
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| 145 | */ |
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| 146 | 14 | public function getAllItems() |
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| 150 | } |
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| 151 |
This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.