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 EntityProperty 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 EntityProperty, and based on these observations, apply Extract Interface, too.
1 | <?php |
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19 | class EntityProperty |
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20 | { |
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21 | |||
22 | const STRING = 'string'; |
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23 | const INTEGER = 'integer'; |
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24 | const FLOAT = 'float'; |
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25 | const DOUBLE = 'double'; |
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26 | const BOOL = 'bool'; |
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27 | |||
28 | const DATE = 'date'; |
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29 | const DATETIME = 'datetime'; |
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30 | |||
31 | const VARBINARY = 'varbinary'; |
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32 | |||
33 | const UUID = 'uuid'; |
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34 | |||
35 | const ENUM = 'enum'; |
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36 | |||
37 | /** |
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38 | * @var string Entity property type |
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39 | */ |
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40 | protected $type; |
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41 | |||
42 | /** |
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43 | * @var int Entity property max length |
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44 | */ |
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45 | protected $length; |
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46 | |||
47 | /** |
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48 | * @var array Allowed values |
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49 | */ |
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50 | protected $values; |
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51 | |||
52 | /** |
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53 | * @param string|array $type |
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54 | */ |
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55 | 13 | public function __construct($type) |
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84 | |||
85 | /** |
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86 | * Set entity property type |
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87 | * |
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88 | * @param string $type |
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89 | * |
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90 | * @throws EntityPropertyTypeNonexistentException |
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91 | */ |
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92 | 13 | protected function setType(string $type) |
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100 | |||
101 | /** |
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102 | * Validate value for entity property |
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103 | * |
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104 | * @param mixed $value Entity property value |
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105 | * |
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106 | * @return bool TRUE if valid, otherwise FALSE |
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107 | * |
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108 | * @throws EntityPropertyTypeNotImplementedException If entity property type is not implemented |
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109 | * @throws EntityPropertyValueExceedingLengthException If value is exceeding allowed length for entity property |
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110 | * @throws InvalidENUMValueForEntityPropertyException If ENUM value is invalid for entity property |
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111 | * @throws InvalidUUIDValueForEntityPropertyException If UUID value is invalid for entity property |
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112 | * @throws InvalidValueTypeForEntityPropertyException If value is invalid for entity property |
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113 | */ |
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114 | public function validateValue($value): bool |
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213 | |||
214 | /** |
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215 | * Format value according to entity property type |
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216 | * |
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217 | * @param mixed $value Value |
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218 | * |
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219 | * @return mixed Value |
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220 | * |
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221 | * @throws EntityPropertyTypeNotImplementedException If entity property type is not implemented |
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222 | */ |
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223 | public function formatValueForEntity($value) |
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266 | |||
267 | /** |
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268 | * Format value for insertion into the database |
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269 | * |
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270 | * @param mixed $value Value |
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271 | * |
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272 | * @return mixed Value |
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273 | */ |
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274 | public function formatValueForDatabase($value) |
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294 | } |
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295 |
This check looks for accesses to local static members using the fully qualified name instead of
self::
.While this is perfectly valid, the fully qualified name of
Certificate::TRIPLEDES_CBC
could just as well be replaced byself::TRIPLEDES_CBC
. Referencing local members withself::
assured the access will still work when the class is renamed, makes it perfectly clear that the member is in fact local and will usually be shorter.