BurningFlipside /
CommonCode
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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| 39 | |||
| 40 | private function initializeFromArray($array) |
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| 55 | |||
| 56 | protected function update($obj) |
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| 74 | |||
| 75 | /** |
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| 76 | * Get the specified field from the cached object or LDAPObject |
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| 77 | * |
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| 78 | * @param string $fieldName The name of the field to retrieve |
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| 79 | * |
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| 80 | * @return mixed string|array the value of the field |
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| 81 | */ |
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| 82 | protected function getField($fieldName) |
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| 83 | { |
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| 84 | if(!is_object($this->ldapObj)) |
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| 85 | { |
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| 86 | return $this->getFieldLocal($fieldName); |
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| 87 | } |
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| 88 | return $this->getFieldServer($fieldName); |
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| 89 | } |
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| 90 | |||
| 91 | /** |
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| 92 | * Get the value of the specified field from the cached object or LDAPObject |
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| 93 | * |
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| 94 | * @param string $fieldName The name of the field to retrieve |
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| 95 | * |
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| 96 | * @return mixed string the value of the field |
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| 97 | */ |
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| 98 | protected function getFieldSingleValue($fieldName) |
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| 99 | { |
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| 100 | if(!is_object($this->ldapObj)) |
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| 101 | { |
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| 102 | return $this->getFieldLocalSingleValue($fieldName); |
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| 103 | } |
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| 104 | return $this->getFieldServerSingleValue($fieldName); |
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| 105 | } |
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| 106 | |||
| 107 | /** |
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| 108 | * Set the value of the specified field in the cached object or LDAPObject |
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| 109 | * |
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| 110 | * @param string $fieldName The name of the field to set |
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| 111 | * @param mixed $fieldValue The value to set in the field |
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| 112 | * |
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| 113 | * @return boolean true if the field is set and false otherwise |
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| 114 | */ |
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| 115 | protected function setField($fieldName, $fieldValue) |
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| 123 | |||
| 124 | /** |
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| 125 | * Append a value of the specified field in the cached object or LDAPObject |
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| 126 | * |
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| 127 | * @param string $fieldName The name of the field to set |
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| 128 | * @param mixed $fieldValue The value to append to the field |
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| 129 | * |
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| 130 | * @return boolean true if the field is set and false otherwise |
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| 131 | */ |
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| 132 | protected function appendField($fieldName, $fieldValue) |
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| 140 | |||
| 141 | /** |
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| 142 | * Get the value of the field in the local cache |
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| 143 | * |
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| 144 | * @param string $fieldName The name of the field to retrieve |
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| 145 | * |
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| 146 | * @return mixed the value of the field |
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| 147 | */ |
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| 148 | private function getFieldLocal($fieldName) |
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| 149 | { |
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| 150 | if($this->ldapObj === false) |
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| 151 | { |
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| 152 | return false; |
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| 153 | } |
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| 154 | if(!isset($this->ldapObj[$fieldName])) |
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| 155 | { |
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| 156 | return false; |
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| 157 | } |
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| 158 | return $this->ldapObj[$fieldName]; |
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| 159 | } |
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| 160 | |||
| 161 | /** |
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| 162 | * Get the value of the field in the server object |
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| 163 | * |
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| 164 | * @param string $fieldName The name of the field to retrieve |
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| 165 | * |
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| 166 | * @return mixed the value of the field |
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| 167 | */ |
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| 168 | private function getFieldServer($fieldName) |
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| 169 | { |
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| 170 | $lowerName = strtolower($fieldName); |
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| 171 | if(!isset($this->ldapObj->{$lowerName})) |
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| 172 | { |
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| 173 | return false; |
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| 174 | } |
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| 175 | return $this->ldapObj->{$lowerName}; |
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| 176 | } |
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| 177 | |||
| 178 | /** |
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| 179 | * Get the value of the specified field from the local cache |
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| 180 | * |
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| 181 | * @param string $fieldName The name of the field to retrieve |
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| 182 | * |
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| 183 | * @return string the value of the field |
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| 184 | */ |
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| 185 | private function getFieldLocalSingleValue($fieldName) |
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| 186 | { |
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| 187 | if($this->ldapObj === false) |
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| 188 | { |
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| 189 | return false; |
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| 190 | } |
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| 191 | if(!isset($this->ldapObj[$fieldName])) |
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| 192 | { |
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| 193 | return false; |
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| 194 | } |
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| 195 | if(is_array($this->ldapObj[$fieldName])) |
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| 196 | { |
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| 197 | return $this->ldapObj[$fieldName][0]; |
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| 198 | } |
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| 199 | return $this->ldapObj[$fieldName]; |
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| 200 | } |
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| 201 | |||
| 202 | /** |
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| 203 | * Get the value of the specified field from the server |
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| 204 | * |
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| 205 | * @param string $fieldName The name of the field to retrieve |
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| 206 | * |
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| 207 | * @return string the value of the field |
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| 208 | */ |
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| 209 | private function getFieldServerSingleValue($fieldName) |
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| 210 | { |
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| 211 | $lowerName = strtolower($fieldName); |
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| 212 | if(!isset($this->ldapObj->{$lowerName})) |
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| 213 | { |
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| 214 | return false; |
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| 215 | } |
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| 216 | $field = $this->ldapObj->{$lowerName}; |
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| 217 | if(!isset($field[0])) |
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| 218 | { |
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| 219 | return false; |
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| 220 | } |
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| 221 | return $field[0]; |
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| 222 | } |
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| 223 | |||
| 224 | /** |
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| 225 | * Set the specified field in the server |
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| 226 | * |
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| 227 | * @param string $fieldName The name of the field to set |
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| 228 | * @param mixed $fieldValue The value to write to the field |
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| 229 | * |
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| 230 | * @return boolean true if the field is set and false otherwise |
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| 231 | */ |
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| 232 | private function setFieldServer($fieldName, $fieldValue) |
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| 247 | |||
| 248 | /** |
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| 249 | * Append a value of the specified field in the server |
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| 250 | * |
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| 251 | * @param string $fieldName The name of the field to set |
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| 252 | * @param mixed $fieldValue The value to append to the field |
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| 253 | * |
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| 254 | * @return boolean true if the field is set and false otherwise |
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| 255 | */ |
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| 256 | private function appendFieldServer($fieldName, $fieldValue) |
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| 271 | |||
| 272 | /** |
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| 273 | * Set the specified field in the local cache |
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| 274 | * |
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| 275 | * @param string $fieldName The name of the field to set |
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| 276 | * @param mixed $fieldValue The value to write to the field |
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| 277 | * |
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| 278 | * @return boolean true if the field is set and false otherwise |
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| 279 | */ |
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| 280 | private function setFieldLocal($fieldName, $fieldValue) |
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| 297 | |||
| 298 | /** |
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| 299 | * Append a value of the specified field in the local cache |
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| 300 | * |
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| 301 | * @param string $fieldName The name of the field to set |
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| 302 | * @param mixed $fieldValue The value to append to the field |
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| 303 | * |
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| 304 | * @return boolean true if the field is set and false otherwise |
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| 305 | */ |
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| 306 | private function appendFieldLocal($fieldName, $fieldValue) |
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| 319 | } |
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| 320 | |||
| 321 | /* vim: set tabstop=4 shiftwidth=4 expandtab: */ |
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| 322 |
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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: