Complex classes like LDAPCachableObject 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 LDAPCachableObject, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 4 | trait LDAPCachableObject |
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| 5 | { |
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| 6 | protected function initialize($data) |
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| 24 | |||
| 25 | private function initializeFromDN($dn) |
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| 34 | |||
| 35 | private function initializeFromArray($array) |
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| 50 | |||
| 51 | protected function update($obj) |
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| 69 | |||
| 70 | /** |
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| 71 | * Get the specified field from the cached object or LDAPObject |
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| 72 | * |
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| 73 | * @param string $fieldName The name of the field to retrieve |
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| 74 | * |
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| 75 | * @return mixed string|array the value of the field |
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| 76 | */ |
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| 77 | protected function getField($fieldName) |
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| 85 | |||
| 86 | /** |
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| 87 | * Get the value of the specified field from the cached object or LDAPObject |
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| 88 | * |
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| 89 | * @param string $fieldName The name of the field to retrieve |
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| 90 | * |
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| 91 | * @return mixed string the value of the field |
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| 92 | */ |
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| 93 | protected function getFieldSingleValue($fieldName) |
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| 101 | |||
| 102 | /** |
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| 103 | * Set the value of the specified field in the cached object or LDAPObject |
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| 104 | * |
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| 105 | * @param string $fieldName The name of the field to set |
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| 106 | * @param mixed $fieldValue The value to set in the field |
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| 107 | * |
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| 108 | * @return boolean true if the field is set and false otherwise |
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| 109 | */ |
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| 110 | protected function setField($fieldName, $fieldValue) |
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| 118 | |||
| 119 | /** |
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| 120 | * Append a value of the specified field in the cached object or LDAPObject |
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| 121 | * |
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| 122 | * @param string $fieldName The name of the field to set |
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| 123 | * @param mixed $fieldValue The value to append to the field |
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| 124 | * |
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| 125 | * @return boolean true if the field is set and false otherwise |
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| 126 | */ |
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| 127 | protected function appendField($fieldName, $fieldValue) |
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| 135 | |||
| 136 | /** |
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| 137 | * Get the value of the field in the local cache |
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| 138 | * |
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| 139 | * @param string $fieldName The name of the field to retrieve |
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| 140 | * |
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| 141 | * @return mixed the value of the field |
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| 142 | */ |
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| 143 | private function getFieldLocal($fieldName) |
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| 155 | |||
| 156 | /** |
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| 157 | * Get the value of the field in the server object |
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| 158 | * |
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| 159 | * @param string $fieldName The name of the field to retrieve |
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| 160 | * |
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| 161 | * @return mixed the value of the field |
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| 162 | */ |
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| 163 | private function getFieldServer($fieldName) |
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| 172 | |||
| 173 | /** |
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| 174 | * Get the value of the specified field from the local cache |
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| 175 | * |
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| 176 | * @param string $fieldName The name of the field to retrieve |
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| 177 | * |
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| 178 | * @return string the value of the field |
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| 179 | */ |
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| 180 | private function getFieldLocalSingleValue($fieldName) |
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| 196 | |||
| 197 | /** |
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| 198 | * Get the value of the specified field from the server |
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| 199 | * |
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| 200 | * @param string $fieldName The name of the field to retrieve |
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| 201 | * |
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| 202 | * @return string the value of the field |
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| 203 | */ |
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| 204 | private function getFieldServerSingleValue($fieldName) |
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| 218 | |||
| 219 | /** |
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| 220 | * Set the specified field in the server |
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| 221 | * |
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| 222 | * @param string $fieldName The name of the field to set |
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| 223 | * @param mixed $fieldValue The value to write to the field |
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| 224 | * |
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| 225 | * @return boolean true if the field is set and false otherwise |
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| 226 | */ |
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| 227 | private function setFieldServer($fieldName, $fieldValue) |
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| 242 | |||
| 243 | /** |
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| 244 | * Append a value of the specified field in the server |
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| 245 | * |
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| 246 | * @param string $fieldName The name of the field to set |
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| 247 | * @param mixed $fieldValue The value to append to the field |
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| 248 | * |
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| 249 | * @return boolean true if the field is set and false otherwise |
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| 250 | */ |
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| 251 | private function appendFieldServer($fieldName, $fieldValue) |
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| 266 | |||
| 267 | /** |
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| 268 | * Set the specified field in the local cache |
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| 269 | * |
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| 270 | * @param string $fieldName The name of the field to set |
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| 271 | * @param mixed $fieldValue The value to write to the field |
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| 272 | * |
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| 273 | * @return boolean true if the field is set and false otherwise |
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| 274 | */ |
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| 275 | private function setFieldLocal($fieldName, $fieldValue) |
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| 292 | |||
| 293 | /** |
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| 294 | * Append a value of the specified field in the local cache |
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| 295 | * |
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| 296 | * @param string $fieldName The name of the field to set |
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| 297 | * @param mixed $fieldValue The value to append to the field |
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| 298 | * |
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| 299 | * @return boolean true if the field is set and false otherwise |
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| 300 | */ |
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| 301 | private function appendFieldLocal($fieldName, $fieldValue) |
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| 314 | } |
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| 315 | |||
| 317 |
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: