Complex classes like Spec 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 Spec, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 86 | class Spec  | 
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| 87 | { | 
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| 88 | /**  | 
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| 89 | * @param string $name  | 
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| 90 | * @param array $arguments  | 
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| 91 | *  | 
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| 92 | * @return PlatformFunction  | 
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| 93 | */  | 
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| 94 | public static function __callStatic($name, array $arguments = [])  | 
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| 106 | |||
| 107 | /*  | 
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| 108 | * Logic  | 
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| 109 | */  | 
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| 110 | |||
| 111 | /**  | 
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| 112 | * @return AndX  | 
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| 113 | */  | 
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| 114 | public static function andX()  | 
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| 121 | |||
| 122 | /**  | 
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| 123 | * @return OrX  | 
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| 124 | */  | 
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| 125 | public static function orX()  | 
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| 132 | |||
| 133 | /**  | 
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| 134 | * @param Filter $spec  | 
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| 135 | *  | 
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| 136 | * @return Not  | 
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| 137 | */  | 
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| 138 | public static function not(Filter $spec)  | 
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| 142 | |||
| 143 | /*  | 
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| 144 | * Query modifier  | 
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| 145 | */  | 
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| 146 | |||
| 147 | /**  | 
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| 148 | * @param string $field  | 
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| 149 | * @param string $newAlias  | 
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| 150 | * @param string $dqlAlias  | 
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| 151 | *  | 
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| 152 | * @return Join  | 
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| 153 | */  | 
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| 154 | public static function join($field, $newAlias, $dqlAlias = null)  | 
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| 158 | |||
| 159 | /**  | 
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| 160 | * @param string $field  | 
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| 161 | * @param string $newAlias  | 
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| 162 | * @param string $dqlAlias  | 
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| 163 | *  | 
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| 164 | * @return LeftJoin  | 
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| 165 | */  | 
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| 166 | public static function leftJoin($field, $newAlias, $dqlAlias = null)  | 
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| 170 | |||
| 171 | /**  | 
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| 172 | * @param string $field  | 
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| 173 | * @param string $newAlias  | 
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| 174 | * @param string $dqlAlias  | 
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| 175 | *  | 
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| 176 | * @return InnerJoin  | 
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| 177 | */  | 
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| 178 | public static function innerJoin($field, $newAlias, $dqlAlias = null)  | 
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| 182 | |||
| 183 | /**  | 
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| 184 | * @param string $field  | 
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| 185 | * @param string $dqlAlias  | 
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| 186 | *  | 
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| 187 | * @return IndexBy  | 
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| 188 | */  | 
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| 189 | public static function indexBy($field, $dqlAlias = null)  | 
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| 193 | |||
| 194 | /**  | 
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| 195 | * @param int $count  | 
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| 196 | *  | 
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| 197 | * @return Limit  | 
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| 198 | */  | 
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| 199 | public static function limit($count)  | 
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| 203 | |||
| 204 | /**  | 
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| 205 | * @param int $count  | 
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| 206 | *  | 
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| 207 | * @return Offset  | 
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| 208 | */  | 
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| 209 | public static function offset($count)  | 
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| 213 | |||
| 214 | /**  | 
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| 215 | * @param int $sliceSize  | 
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| 216 | * @param int $sliceNumber  | 
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| 217 | *  | 
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| 218 | * @return Slice  | 
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| 219 | */  | 
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| 220 | public static function slice($sliceSize, $sliceNumber = 0)  | 
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| 224 | |||
| 225 | /**  | 
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| 226 | * @param string $field  | 
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| 227 | * @param string $order  | 
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| 228 | * @param string|null $dqlAlias  | 
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| 229 | *  | 
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| 230 | * @return OrderBy  | 
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| 231 | */  | 
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| 232 | public static function orderBy($field, $order = 'ASC', $dqlAlias = null)  | 
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| 236 | |||
| 237 | /**  | 
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| 238 | * @param string $field  | 
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| 239 | * @param string $dqlAlias  | 
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| 240 | *  | 
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| 241 | * @return GroupBy  | 
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| 242 | */  | 
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| 243 | public static function groupBy($field, $dqlAlias = null)  | 
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| 247 | |||
| 248 | /*  | 
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| 249 | * Selection  | 
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| 250 | */  | 
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| 251 | |||
| 252 | /**  | 
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| 253 | * @param mixed $field  | 
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| 254 | *  | 
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| 255 | * @return Select  | 
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| 256 | */  | 
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| 257 | public static function select($field)  | 
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| 261 | |||
| 262 | /**  | 
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| 263 | * @param mixed $field  | 
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| 264 | *  | 
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| 265 | * @return AddSelect  | 
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| 266 | */  | 
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| 267 | public static function addSelect($field)  | 
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| 271 | |||
| 272 | /**  | 
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| 273 | * @param string $dqlAlias  | 
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| 274 | *  | 
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| 275 | * @return SelectEntity  | 
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| 276 | */  | 
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| 277 | public static function selectEntity($dqlAlias)  | 
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| 281 | |||
| 282 | /**  | 
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| 283 | * @param Filter|Operand|string $expression  | 
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| 284 | * @param string $alias  | 
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| 285 | *  | 
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| 286 | * @return SelectAs  | 
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| 287 | */  | 
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| 288 | public static function selectAs($expression, $alias)  | 
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| 292 | |||
| 293 | /**  | 
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| 294 | * @param Filter|Operand|string $expression  | 
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| 295 | * @param string $alias  | 
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| 296 | *  | 
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| 297 | * @return SelectHiddenAs  | 
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| 298 | */  | 
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| 299 | public static function selectHiddenAs($expression, $alias)  | 
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| 303 | |||
| 304 | /*  | 
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| 305 | * Result modifier  | 
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| 306 | */  | 
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| 307 | |||
| 308 | /**  | 
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| 309 | * @return AsArray  | 
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| 310 | */  | 
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| 311 | public static function asArray()  | 
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| 315 | |||
| 316 | /**  | 
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| 317 | * @return AsSingleScalar  | 
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| 318 | */  | 
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| 319 | public static function asSingleScalar()  | 
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| 323 | |||
| 324 | /**  | 
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| 325 | * @return AsScalar  | 
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| 326 | */  | 
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| 327 | public static function asScalar()  | 
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| 331 | |||
| 332 | /**  | 
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| 333 | * @param int $cacheLifetime How many seconds the cached entry is valid  | 
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| 334 | *  | 
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| 335 | * @return Cache  | 
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| 336 | */  | 
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| 337 | public static function cache($cacheLifetime)  | 
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| 341 | |||
| 342 | /**  | 
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| 343 | * @param int $roundSeconds How may seconds to round time  | 
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| 344 | *  | 
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| 345 | * @return RoundDateTime  | 
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| 346 | */  | 
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| 347 | public static function roundDateTimeParams($roundSeconds)  | 
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| 351 | |||
| 352 | /*  | 
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| 353 | * Filters  | 
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| 354 | */  | 
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| 355 | |||
| 356 | /**  | 
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| 357 | * @param Operand|string $field  | 
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| 358 | * @param string|null $dqlAlias  | 
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| 359 | *  | 
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| 360 | * @return IsNull  | 
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| 361 | */  | 
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| 362 | public static function isNull($field, $dqlAlias = null)  | 
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| 366 | |||
| 367 | /**  | 
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| 368 | * @param Operand|string $field  | 
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| 369 | * @param string|null $dqlAlias  | 
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| 370 | *  | 
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| 371 | * @return IsNotNull  | 
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| 372 | */  | 
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| 373 | public static function isNotNull($field, $dqlAlias = null)  | 
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| 377 | |||
| 378 | /**  | 
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| 379 | * Make sure the $field has a value equals to $value.  | 
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| 380 | *  | 
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| 381 | * @param string $field  | 
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| 382 | * @param mixed $value  | 
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| 383 | * @param string $dqlAlias  | 
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| 384 | *  | 
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| 385 | * @return In  | 
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| 386 | */  | 
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| 387 | public static function in($field, $value, $dqlAlias = null)  | 
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| 391 | |||
| 392 | /**  | 
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| 393 | * @param string $field  | 
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| 394 | * @param mixed $value  | 
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| 395 | * @param string $dqlAlias  | 
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| 396 | *  | 
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| 397 | * @return Not  | 
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| 398 | */  | 
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| 399 | public static function notIn($field, $value, $dqlAlias = null)  | 
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| 403 | |||
| 404 | /**  | 
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| 405 | * @param Operand|string $field  | 
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| 406 | * @param Operand|mixed $value  | 
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| 407 | * @param string|null $dqlAlias  | 
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| 408 | *  | 
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| 409 | * @return Comparison  | 
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| 410 | */  | 
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| 411 | public static function eq($field, $value, $dqlAlias = null)  | 
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| 415 | |||
| 416 | /**  | 
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| 417 | * @param Operand|string $field  | 
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| 418 | * @param Operand|mixed $value  | 
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| 419 | * @param string|null $dqlAlias  | 
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| 420 | *  | 
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| 421 | * @return Comparison  | 
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| 422 | */  | 
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| 423 | public static function neq($field, $value, $dqlAlias = null)  | 
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| 427 | |||
| 428 | /**  | 
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| 429 | * @param Operand|string $field  | 
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| 430 | * @param Operand|mixed $value  | 
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| 431 | * @param string|null $dqlAlias  | 
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| 432 | *  | 
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| 433 | * @return Comparison  | 
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| 434 | */  | 
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| 435 | public static function lt($field, $value, $dqlAlias = null)  | 
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| 439 | |||
| 440 | /**  | 
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| 441 | * @param Operand|string $field  | 
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| 442 | * @param Operand|mixed $value  | 
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| 443 | * @param string|null $dqlAlias  | 
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| 444 | *  | 
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| 445 | * @return Comparison  | 
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| 446 | */  | 
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| 447 | public static function lte($field, $value, $dqlAlias = null)  | 
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| 451 | |||
| 452 | /**  | 
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| 453 | * @param Operand|string $field  | 
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| 454 | * @param Operand|mixed $value  | 
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| 455 | * @param string|null $dqlAlias  | 
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| 456 | *  | 
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| 457 | * @return Comparison  | 
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| 458 | */  | 
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| 459 | public static function gt($field, $value, $dqlAlias = null)  | 
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| 463 | |||
| 464 | /**  | 
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| 465 | * @param Operand|string $field  | 
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| 466 | * @param Operand|mixed $value  | 
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| 467 | * @param string|null $dqlAlias  | 
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| 468 | *  | 
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| 469 | * @return Comparison  | 
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| 470 | */  | 
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| 471 | public static function gte($field, $value, $dqlAlias = null)  | 
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| 475 | |||
| 476 | /**  | 
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| 477 | * @param Operand|string $field  | 
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| 478 | * @param string $value  | 
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| 479 | * @param string $format  | 
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| 480 | * @param string|null $dqlAlias  | 
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| 481 | *  | 
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| 482 | * @return Like  | 
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| 483 | */  | 
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| 484 | public static function like($field, $value, $format = Like::CONTAINS, $dqlAlias = null)  | 
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| 488 | |||
| 489 | /**  | 
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| 490 | * @param string $value  | 
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| 491 | * @param string|null $dqlAlias  | 
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| 492 | *  | 
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| 493 | * @return InstanceOfX  | 
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| 494 | */  | 
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| 495 | public static function instanceOfX($value, $dqlAlias = null)  | 
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| 499 | |||
| 500 | /**  | 
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| 501 | * @param Operand|string $value  | 
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| 502 | * @param Operand|string $field  | 
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| 503 | * @param string|null $dqlAlias  | 
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| 504 | *  | 
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| 505 | * @return MemberOfX  | 
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| 506 | */  | 
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| 507 | public static function memberOfX($value, $field, $dqlAlias = null)  | 
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| 511 | |||
| 512 | /*  | 
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| 513 | * Specifications  | 
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| 514 | */  | 
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| 515 | |||
| 516 | /**  | 
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| 517 | * @param Filter|QueryModifier $spec  | 
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| 518 | *  | 
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| 519 | * @return CountOf  | 
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| 520 | */  | 
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| 521 | public static function countOf($spec)  | 
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| 525 | |||
| 526 | /**  | 
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| 527 | * @param Filter|string $spec  | 
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| 528 | *  | 
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| 529 | * @return Having  | 
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| 530 | */  | 
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| 531 | public static function having($spec)  | 
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| 535 | |||
| 536 | /*  | 
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| 537 | * Operands  | 
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| 538 | */  | 
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| 539 | |||
| 540 | /**  | 
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| 541 | * @param string $fieldName  | 
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| 542 | *  | 
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| 543 | * @return Field  | 
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| 544 | */  | 
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| 545 | public static function field($fieldName)  | 
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| 549 | |||
| 550 | /**  | 
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| 551 | * @param mixed $value  | 
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| 552 | * @param int|string|null $valueType  | 
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| 553 | *  | 
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| 554 | * @return Value  | 
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| 555 | */  | 
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| 556 | public static function value($value, $valueType = null)  | 
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| 560 | |||
| 561 | /**  | 
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| 562 | * @param array $values  | 
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| 563 | * @param int|string|null $valueType  | 
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| 564 | *  | 
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| 565 | * @return Values  | 
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| 566 | */  | 
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| 567 | public static function values($values, $valueType = null)  | 
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| 571 | |||
| 572 | /**  | 
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| 573 | * @param string $value  | 
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| 574 | * @param string $format  | 
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| 575 | *  | 
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| 576 | * @return LikePattern  | 
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| 577 | */  | 
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| 578 | public static function likePattern($value, $format = LikePattern::CONTAINS)  | 
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| 582 | |||
| 583 | /*  | 
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| 584 | * Arithmetic operands  | 
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| 585 | */  | 
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| 586 | |||
| 587 | /**  | 
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| 588 | * @param Operand|string $field  | 
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| 589 | * @param Operand|mixed $value  | 
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| 590 | *  | 
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| 591 | * @return Addition  | 
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| 592 | */  | 
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| 593 | public static function add($field, $value)  | 
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| 597 | |||
| 598 | /**  | 
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| 599 | * @param Operand|string $field  | 
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| 600 | * @param Operand|mixed $value  | 
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| 601 | *  | 
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| 602 | * @return Subtraction  | 
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| 603 | */  | 
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| 604 | public static function sub($field, $value)  | 
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| 608 | |||
| 609 | /**  | 
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| 610 | * @param Operand|string $field  | 
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| 611 | * @param Operand|mixed $value  | 
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| 612 | *  | 
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| 613 | * @return Multiplication  | 
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| 614 | */  | 
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| 615 | public static function mul($field, $value)  | 
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| 619 | |||
| 620 | /**  | 
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| 621 | * @param Operand|string $field  | 
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| 622 | * @param Operand|mixed $value  | 
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| 623 | *  | 
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| 624 | * @return Division  | 
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| 625 | */  | 
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| 626 | public static function div($field, $value)  | 
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| 630 | |||
| 631 | /**  | 
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| 632 | * @param Operand|string $field  | 
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| 633 | * @param Operand|mixed $value  | 
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| 634 | *  | 
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| 635 | * @return Modulo  | 
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| 636 | */  | 
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| 637 | public static function mod($field, $value)  | 
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| 641 | |||
| 642 | /*  | 
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| 643 | * Bitwise operands  | 
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| 644 | */  | 
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| 645 | |||
| 646 | /**  | 
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| 647 | * @param Operand|string $field  | 
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| 648 | * @param Operand|mixed $value  | 
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| 649 | *  | 
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| 650 | * @return BitAnd  | 
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| 651 | */  | 
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| 652 | public static function bAnd($field, $value)  | 
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| 656 | |||
| 657 | /**  | 
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| 658 | * @param Operand|string $field  | 
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| 659 | * @param Operand|mixed $value  | 
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| 660 | *  | 
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| 661 | * @return BitOr  | 
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| 662 | */  | 
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| 663 | public static function bOr($field, $value)  | 
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| 667 | |||
| 668 | /**  | 
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| 669 | * @param Operand|string $field  | 
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| 670 | * @param Operand|mixed $value  | 
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| 671 | *  | 
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| 672 | * @return BitXor  | 
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| 673 | */  | 
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| 674 | public static function bXor($field, $value)  | 
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| 678 | |||
| 679 | /**  | 
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| 680 | * @param Operand|string $field  | 
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| 681 | * @param Operand|mixed $value  | 
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| 682 | *  | 
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| 683 | * @return BitLeftShift  | 
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| 684 | */  | 
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| 685 | public static function bLs($field, $value)  | 
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| 689 | |||
| 690 | /**  | 
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| 691 | * @param Operand|string $field  | 
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| 692 | * @param Operand|mixed $value  | 
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| 693 | *  | 
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| 694 | * @return BitRightShift  | 
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| 695 | */  | 
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| 696 | public static function bRs($field, $value)  | 
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| 700 | |||
| 701 | /**  | 
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| 702 | * @param Operand|string $field  | 
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| 703 | *  | 
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| 704 | * @return BitNot  | 
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| 705 | */  | 
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| 706 | public static function bNot($field)  | 
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| 710 | |||
| 711 | /**  | 
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| 712 | * Call DQL function.  | 
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| 713 | *  | 
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| 714 | * Usage:  | 
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| 715 |      *  Spec::fun('CURRENT_DATE') | 
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| 716 |      *  Spec::fun('DATE_DIFF', $date1, $date2) | 
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| 717 |      *  Spec::fun('DATE_DIFF', [$date1, $date2]) | 
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| 718 | *  | 
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| 719 | * @param string $functionName  | 
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| 720 | * @param mixed $arguments  | 
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| 721 | *  | 
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| 722 | * @return PlatformFunction  | 
            ||
| 723 | */  | 
            ||
| 724 | public static function fun($functionName, $arguments = [])  | 
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| 735 | |||
| 736 | /**  | 
            ||
| 737 | * @param string $alias  | 
            ||
| 738 | *  | 
            ||
| 739 | * @return Alias  | 
            ||
| 740 | */  | 
            ||
| 741 | public static function alias($alias)  | 
            ||
| 745 | }  | 
            ||
| 746 | 
This check looks from parameters that have been defined for a function or method, but which are not used in the method body.