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 ConceptPropertyValue 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 ConceptPropertyValue, and based on these observations, apply Extract Interface, too.
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| 6 | class ConceptPropertyValue extends VocabularyDataObject |
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| 7 | { |
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| 8 | /** submembers */ |
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| 9 | private $submembers; |
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| 10 | /** property type */ |
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| 11 | private $type; |
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| 12 | /** content language */ |
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| 13 | private $clang; |
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| 14 | |||
| 15 | View Code Duplication | public function __construct($model, $vocab, $resource, $prop, $clang = '') |
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| 22 | |||
| 23 | public function __toString() |
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| 33 | public function getLang() |
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| 37 | |||
| 38 | public function getLabel($lang = '') |
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| 76 | public function getType() |
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| 81 | public function getUri() |
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| 85 | |||
| 86 | public function getVocab() |
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| 91 | public function getVocabName() |
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| 95 | |||
| 96 | public function addSubMember($member, $lang = '') |
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| 103 | public function getSubMembers() |
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| 112 | private function sortSubMembers() |
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| 119 | |||
| 120 | public function isExternal() { |
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| 124 | |||
| 125 | public function getNotation() |
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| 132 | |||
| 133 | public function isReified() { |
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| 136 | |||
| 137 | public function getReifiedPropertyValues() { |
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| 153 | |||
| 154 | } |
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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.