Complex classes like QueryBuilder 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 QueryBuilder, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 10 | class QueryBuilder |
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| 11 | { |
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| 12 | /** |
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| 13 | * @var TableFactory $tableFactory |
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| 14 | */ |
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| 15 | private $tableFactory; |
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| 16 | |||
| 17 | /** |
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| 18 | * @var CompilerManager $compilerManager |
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| 19 | */ |
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| 20 | private $compilerManager; |
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| 21 | |||
| 22 | /** |
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| 23 | * @var array $selectClauses |
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| 24 | */ |
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| 25 | private $selectClauses; |
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| 26 | |||
| 27 | /** |
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| 28 | * @var array $whereClauses |
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| 29 | */ |
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| 30 | private $whereClauses; |
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| 31 | |||
| 32 | /** |
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| 33 | * @var array $orderByClauses |
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| 34 | */ |
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| 35 | private $orderByClauses; |
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| 36 | |||
| 37 | /** |
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| 38 | * @var array $setClauses |
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| 39 | */ |
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| 40 | private $setClauses; |
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| 41 | |||
| 42 | /** |
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| 43 | * @var array $groupByClauses |
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| 44 | */ |
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| 45 | private $groupByClauses; |
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| 46 | |||
| 47 | /** |
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| 48 | * @var array $havingClauses |
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| 49 | */ |
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| 50 | private $havingClauses; |
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| 51 | |||
| 52 | /** |
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| 53 | * @var AbstractTable[] $tables |
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| 54 | */ |
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| 55 | private $tables = []; |
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| 56 | |||
| 57 | /** |
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| 58 | * @var bool $highPriority |
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| 59 | */ |
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| 60 | private $highPriority; |
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| 61 | |||
| 62 | /** |
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| 63 | * @var int $maxStatementTime |
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| 64 | */ |
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| 65 | private $maxStatementTime; |
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| 66 | |||
| 67 | /** |
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| 68 | * @var bool $straightJoin |
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| 69 | */ |
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| 70 | private $straightJoin; |
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| 71 | |||
| 72 | /** |
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| 73 | * @var bool $sqlSmallResult |
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| 74 | */ |
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| 75 | private $sqlSmallResult; |
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| 76 | |||
| 77 | /** |
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| 78 | * @var bool $sqlBigResult |
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| 79 | */ |
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| 80 | private $sqlBigResult; |
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| 81 | |||
| 82 | /** |
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| 83 | * @var bool $sqlBufferResult |
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| 84 | */ |
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| 85 | private $sqlBufferResult; |
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| 86 | |||
| 87 | /** |
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| 88 | * @var bool $sqlNoCache |
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| 89 | */ |
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| 90 | private $sqlNoCache; |
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| 91 | |||
| 92 | /** |
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| 93 | * @var bool $sqlCalcFoundRows |
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| 94 | */ |
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| 95 | private $sqlCalcFoundRows; |
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| 96 | |||
| 97 | /** |
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| 98 | * @param TableFactory $tableFactory |
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| 99 | * @param CompilerManager $compilerManager |
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| 100 | */ |
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| 101 | public function __construct(TableFactory $tableFactory = null, CompilerManager $compilerManager = null) |
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| 112 | |||
| 113 | /** |
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| 114 | * @return ExprBuilder |
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| 115 | */ |
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| 116 | public function expr() |
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| 120 | |||
| 121 | /** |
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| 122 | * @return $this |
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| 123 | */ |
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| 124 | public function addSelect() |
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| 130 | |||
| 131 | /** |
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| 132 | * @return $this |
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| 133 | */ |
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| 134 | public function andWhere() |
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| 140 | |||
| 141 | /** |
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| 142 | * @return $this |
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| 143 | */ |
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| 144 | public function andHaving() |
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| 150 | |||
| 151 | /** |
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| 152 | * @param $table |
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| 153 | * |
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| 154 | * @return AbstractTable |
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| 155 | */ |
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| 156 | private function addRootTable($table) |
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| 165 | |||
| 166 | /** |
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| 167 | * @param mixed $table |
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| 168 | * |
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| 169 | * @return AbstractTable |
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| 170 | */ |
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| 171 | public function from($table) |
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| 175 | |||
| 176 | /** |
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| 177 | * @param mixed $table |
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| 178 | * |
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| 179 | * @return AbstractTable |
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| 180 | */ |
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| 181 | public function addFrom($table) |
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| 185 | |||
| 186 | /** |
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| 187 | * @param mixed $table |
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| 188 | * |
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| 189 | * @return AbstractTable |
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| 190 | */ |
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| 191 | public function update($table) |
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| 195 | |||
| 196 | /** |
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| 197 | * @param string $joinType |
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| 198 | * @param mixed $table |
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| 199 | * |
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| 200 | * @return AbstractTable |
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| 201 | */ |
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| 202 | public function join($joinType, $table) |
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| 211 | |||
| 212 | /** |
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| 213 | * @param mixed $table |
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| 214 | * |
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| 215 | * @return AbstractTable |
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| 216 | */ |
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| 217 | public function crossJoin($table) |
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| 221 | |||
| 222 | /** |
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| 223 | * @param mixed $table |
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| 224 | * |
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| 225 | * @return AbstractTable |
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| 226 | */ |
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| 227 | public function leftJoin($table) |
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| 231 | |||
| 232 | /** |
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| 233 | * @param string $table |
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| 234 | * |
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| 235 | * @return AbstractTable |
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| 236 | */ |
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| 237 | public function innerJoin($table) |
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| 241 | |||
| 242 | /** |
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| 243 | * @return $this |
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| 244 | */ |
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| 245 | public function addOrderBy() |
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| 251 | |||
| 252 | /** |
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| 253 | * @return $this |
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| 254 | */ |
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| 255 | public function addSet() |
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| 261 | |||
| 262 | /** |
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| 263 | * @return $this |
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| 264 | */ |
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| 265 | public function addGroupBy() |
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| 271 | |||
| 272 | /** |
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| 273 | * @return string |
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| 274 | */ |
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| 275 | public function buildSQL() |
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| 279 | |||
| 280 | /** |
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| 281 | * @return Query |
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| 282 | */ |
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| 283 | public function buildQuery() |
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| 287 | |||
| 288 | /** |
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| 289 | * @return array |
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| 290 | */ |
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| 291 | public function getSelectClauses() |
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| 295 | |||
| 296 | /** |
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| 297 | * @return array |
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| 298 | */ |
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| 299 | public function getWhereClauses() |
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| 303 | |||
| 304 | /** |
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| 305 | * @return array |
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| 306 | */ |
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| 307 | public function getOrderByClauses() |
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| 311 | |||
| 312 | /** |
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| 313 | * @return array |
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| 314 | */ |
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| 315 | public function getSetClauses() |
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| 319 | |||
| 320 | /** |
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| 321 | * @return array |
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| 322 | */ |
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| 323 | public function getGroupByClauses() |
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| 327 | |||
| 328 | /** |
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| 329 | * @return array |
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| 330 | */ |
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| 331 | public function getHavingClauses() |
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| 335 | |||
| 336 | /** |
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| 337 | * @return AbstractTable[] |
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| 338 | */ |
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| 339 | public function getTables() |
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| 343 | |||
| 344 | /** |
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| 345 | * @return AbstractTable[] |
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| 346 | */ |
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| 347 | public function getRootTables() |
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| 353 | |||
| 354 | /** |
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| 355 | * @return AbstractTable[] |
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| 356 | */ |
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| 357 | public function getJoinTables() |
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| 363 | |||
| 364 | /** |
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| 365 | * @return boolean |
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| 366 | */ |
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| 367 | public function isHighPriority() |
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| 371 | |||
| 372 | /** |
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| 373 | * @param boolean $highPriority |
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| 374 | * |
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| 375 | * @return $this |
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| 376 | */ |
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| 377 | public function setHighPriority($highPriority) |
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| 383 | |||
| 384 | /** |
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| 385 | * @return int |
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| 386 | */ |
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| 387 | public function getMaxStatementTime() |
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| 391 | |||
| 392 | /** |
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| 393 | * @param integer $maxStatementTime |
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| 394 | * |
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| 395 | * @return $this |
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| 396 | */ |
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| 397 | public function setMaxStatementTime($maxStatementTime) |
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| 403 | |||
| 404 | /** |
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| 405 | * @return boolean |
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| 406 | */ |
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| 407 | public function isStraightJoin() |
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| 411 | |||
| 412 | /** |
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| 413 | * @param boolean $straightJoin |
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| 414 | * |
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| 415 | * @return $this |
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| 416 | */ |
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| 417 | public function setStraightJoin($straightJoin) |
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| 423 | |||
| 424 | /** |
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| 425 | * @return boolean |
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| 426 | */ |
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| 427 | public function isSqlSmallResult() |
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| 431 | |||
| 432 | /** |
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| 433 | * @param boolean $sqlSmallResult |
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| 434 | * |
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| 435 | * @return $this |
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| 436 | */ |
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| 437 | public function setSqlSmallResult($sqlSmallResult) |
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| 443 | |||
| 444 | /** |
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| 445 | * @return boolean |
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| 446 | */ |
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| 447 | public function isSqlBigResult() |
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| 451 | |||
| 452 | /** |
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| 453 | * @param boolean $sqlBigResult |
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| 454 | * |
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| 455 | * @return $this |
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| 456 | */ |
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| 457 | public function setSqlBigResult($sqlBigResult) |
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| 463 | |||
| 464 | /** |
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| 465 | * @return boolean |
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| 466 | */ |
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| 467 | public function isSqlBufferResult() |
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| 471 | |||
| 472 | /** |
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| 473 | * @param boolean $sqlBufferResult |
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| 474 | * |
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| 475 | * @return $this |
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| 476 | */ |
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| 477 | public function setSqlBufferResult($sqlBufferResult) |
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| 483 | |||
| 484 | /** |
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| 485 | * @return boolean |
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| 486 | */ |
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| 487 | public function isSqlNoCache() |
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| 491 | |||
| 492 | /** |
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| 493 | * @param boolean $sqlNoCache |
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| 494 | * |
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| 495 | * @return $this |
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| 496 | */ |
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| 497 | public function setSqlNoCache($sqlNoCache) |
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| 503 | |||
| 504 | /** |
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| 505 | * @return boolean |
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| 506 | */ |
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| 507 | public function isSqlCalcFoundRows() |
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| 511 | |||
| 512 | /** |
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| 513 | * @param boolean $sqlCalcFoundRows |
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| 514 | * |
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| 515 | * @return $this |
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| 516 | */ |
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| 517 | public function setSqlCalcFoundRows($sqlCalcFoundRows) |
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| 523 | } |