Complex classes like Schema 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 Schema, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 13 | class Schema implements \JsonSerializable, \ArrayAccess { |
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| 14 | /** |
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| 15 | * Trigger a notice when extraneous properties are encountered during validation. |
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| 16 | */ |
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| 17 | const VALIDATE_EXTRA_PROPERTY_NOTICE = 0x1; |
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| 18 | |||
| 19 | /** |
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| 20 | * Throw a ValidationException when extraneous properties are encountered during validation. |
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| 21 | */ |
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| 22 | const VALIDATE_EXTRA_PROPERTY_EXCEPTION = 0x2; |
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| 23 | |||
| 24 | /** |
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| 25 | * @var array All the known types. |
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| 26 | * |
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| 27 | * If this is ever given some sort of public access then remove the static. |
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| 28 | */ |
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| 29 | private static $types = [ |
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| 30 | 'array' => ['a'], |
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| 31 | 'object' => ['o'], |
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| 32 | 'integer' => ['i', 'int'], |
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| 33 | 'string' => ['s', 'str'], |
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| 34 | 'number' => ['f', 'float'], |
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| 35 | 'boolean' => ['b', 'bool'], |
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| 36 | 'timestamp' => ['ts'], |
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| 37 | 'datetime' => ['dt'], |
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| 38 | 'null' => ['n'] |
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| 39 | ]; |
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| 40 | |||
| 41 | private $schema = []; |
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| 42 | |||
| 43 | /** |
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| 44 | * @var int A bitwise combination of the various **Schema::FLAG_*** constants. |
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| 45 | */ |
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| 46 | private $flags = 0; |
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| 47 | |||
| 48 | /** |
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| 49 | * @var array An array of callbacks that will filter data in the schema. |
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| 50 | */ |
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| 51 | private $filters = []; |
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| 52 | |||
| 53 | /** |
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| 54 | * @var array An array of callbacks that will custom validate the schema. |
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| 55 | */ |
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| 56 | private $validators = []; |
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| 57 | |||
| 58 | /** |
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| 59 | * @var string|Validation The name of the class or an instance that will be cloned. |
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| 60 | */ |
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| 61 | private $validationClass = Validation::class; |
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| 62 | |||
| 63 | |||
| 64 | /// Methods /// |
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| 65 | |||
| 66 | /** |
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| 67 | * Initialize an instance of a new {@link Schema} class. |
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| 68 | * |
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| 69 | * @param array $schema The array schema to validate against. |
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| 70 | */ |
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| 71 | 165 | public function __construct($schema = []) { |
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| 74 | |||
| 75 | /** |
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| 76 | * Grab the schema's current description. |
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| 77 | * |
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| 78 | * @return string |
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| 79 | */ |
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| 80 | 1 | public function getDescription() { |
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| 83 | |||
| 84 | /** |
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| 85 | * Set the description for the schema. |
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| 86 | * |
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| 87 | * @param string $description The new description. |
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| 88 | * @throws \InvalidArgumentException Throws an exception when the provided description is not a string. |
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| 89 | * @return Schema |
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| 90 | */ |
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| 91 | 2 | public function setDescription($description) { |
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| 100 | |||
| 101 | /** |
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| 102 | * Get a schema field. |
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| 103 | * |
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| 104 | * @param string|array $path The JSON schema path of the field with parts separated by dots. |
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| 105 | * @param mixed $default The value to return if the field isn't found. |
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| 106 | * @return mixed Returns the field value or `$default`. |
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| 107 | */ |
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| 108 | 4 | public function getField($path, $default = null) { |
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| 125 | |||
| 126 | /** |
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| 127 | * Set a schema field. |
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| 128 | * |
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| 129 | * @param string|array $path The JSON schema path of the field with parts separated by dots. |
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| 130 | * @param mixed $value The new value. |
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| 131 | * @return $this |
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| 132 | */ |
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| 133 | 3 | public function setField($path, $value) { |
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| 156 | |||
| 157 | /** |
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| 158 | * Get the ID for the schema. |
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| 159 | * |
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| 160 | * @return string |
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| 161 | */ |
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| 162 | 2 | public function getID() { |
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| 165 | |||
| 166 | /** |
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| 167 | * Set the ID for the schema. |
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| 168 | * |
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| 169 | * @param string $ID The new ID. |
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| 170 | * @throws \InvalidArgumentException Throws an exception when the provided ID is not a string. |
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| 171 | * @return Schema |
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| 172 | */ |
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| 173 | 3 | public function setID($ID) { |
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| 182 | |||
| 183 | /** |
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| 184 | * Return the validation flags. |
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| 185 | * |
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| 186 | * @return int Returns a bitwise combination of flags. |
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| 187 | */ |
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| 188 | 1 | public function getFlags() { |
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| 191 | |||
| 192 | /** |
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| 193 | * Set the validation flags. |
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| 194 | * |
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| 195 | * @param int $flags One or more of the **Schema::FLAG_*** constants. |
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| 196 | * @return Schema Returns the current instance for fluent calls. |
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| 197 | */ |
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| 198 | 8 | public function setFlags($flags) { |
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| 206 | |||
| 207 | /** |
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| 208 | * Whether or not the schema has a flag (or combination of flags). |
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| 209 | * |
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| 210 | * @param int $flag One or more of the **Schema::VALIDATE_*** constants. |
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| 211 | * @return bool Returns **true** if all of the flags are set or **false** otherwise. |
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| 212 | */ |
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| 213 | 18 | public function hasFlag($flag) { |
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| 216 | |||
| 217 | /** |
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| 218 | * Set a flag. |
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| 219 | * |
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| 220 | * @param int $flag One or more of the **Schema::VALIDATE_*** constants. |
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| 221 | * @param bool $value Either true or false. |
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| 222 | * @return $this |
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| 223 | */ |
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| 224 | 1 | public function setFlag($flag, $value) { |
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| 232 | |||
| 233 | /** |
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| 234 | * Merge a schema with this one. |
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| 235 | * |
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| 236 | * @param Schema $schema A scheme instance. Its parameters will be merged into the current instance. |
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| 237 | * @return $this |
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| 238 | */ |
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| 239 | 3 | public function merge(Schema $schema) { |
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| 243 | |||
| 244 | /** |
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| 245 | * Add another schema to this one. |
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| 246 | * |
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| 247 | * Adding schemas together is analogous to array addition. When you add a schema it will only add missing information. |
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| 248 | * |
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| 249 | * @param Schema $schema The schema to add. |
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| 250 | * @param bool $addProperties Whether to add properties that don't exist in this schema. |
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| 251 | * @return $this |
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| 252 | */ |
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| 253 | 3 | public function add(Schema $schema, $addProperties = false) { |
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| 257 | |||
| 258 | /** |
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| 259 | * The internal implementation of schema merging. |
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| 260 | * |
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| 261 | * @param array &$target The target of the merge. |
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| 262 | * @param array $source The source of the merge. |
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| 263 | * @param bool $overwrite Whether or not to replace values. |
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| 264 | * @param bool $addProperties Whether or not to add object properties to the target. |
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| 265 | * @return array |
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| 266 | */ |
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| 267 | 6 | private function mergeInternal(array &$target, array $source, $overwrite = true, $addProperties = true) { |
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| 319 | |||
| 320 | // public function overlay(Schema $schema ) |
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| 321 | |||
| 322 | /** |
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| 323 | * Returns the internal schema array. |
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| 324 | * |
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| 325 | * @return array |
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| 326 | * @see Schema::jsonSerialize() |
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| 327 | */ |
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| 328 | 15 | public function getSchemaArray() { |
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| 331 | |||
| 332 | /** |
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| 333 | * Parse a short schema and return the associated schema. |
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| 334 | * |
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| 335 | * @param array $arr The schema array. |
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| 336 | * @param mixed ...$args Constructor arguments for the schema instance. |
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| 337 | * @return static Returns a new schema. |
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| 338 | */ |
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| 339 | 160 | public static function parse(array $arr, ...$args) { |
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| 344 | |||
| 345 | /** |
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| 346 | * Parse a schema in short form into a full schema array. |
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| 347 | * |
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| 348 | * @param array $arr The array to parse into a schema. |
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| 349 | * @return array The full schema array. |
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| 350 | * @throws \InvalidArgumentException Throws an exception when an item in the schema is invalid. |
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| 351 | */ |
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| 352 | 160 | protected function parseInternal(array $arr) { |
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| 384 | |||
| 385 | /** |
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| 386 | * Parse a schema node. |
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| 387 | * |
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| 388 | * @param array $node The node to parse. |
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| 389 | * @param mixed $value Additional information from the node. |
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| 390 | * @return array Returns a JSON schema compatible node. |
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| 391 | */ |
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| 392 | 154 | private function parseNode($node, $value = null) { |
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| 442 | |||
| 443 | /** |
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| 444 | * Parse the schema for an object's properties. |
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| 445 | * |
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| 446 | * @param array $arr An object property schema. |
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| 447 | * @return array Returns a schema array suitable to be placed in the **properties** key of a schema. |
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| 448 | */ |
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| 449 | 99 | private function parseProperties(array $arr) { |
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| 475 | |||
| 476 | /** |
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| 477 | * Parse a short parameter string into a full array parameter. |
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| 478 | * |
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| 479 | * @param string $key The short parameter string to parse. |
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| 480 | * @param array $value An array of other information that might help resolve ambiguity. |
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| 481 | * @return array Returns an array in the form `[string name, array param, bool required]`. |
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| 482 | * @throws \InvalidArgumentException Throws an exception if the short param is not in the correct format. |
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| 483 | */ |
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| 484 | 154 | public function parseShortParam($key, $value = []) { |
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| 542 | |||
| 543 | /** |
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| 544 | * Add a custom filter to change data before validation. |
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| 545 | * |
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| 546 | * @param string $fieldname The name of the field to filter, if any. |
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| 547 | * |
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| 548 | * If you are adding a filter to a deeply nested field then separate the path with dots. |
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| 549 | * @param callable $callback The callback to filter the field. |
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| 550 | * @return $this |
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| 551 | */ |
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| 552 | 1 | public function addFilter($fieldname, callable $callback) { |
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| 556 | |||
| 557 | /** |
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| 558 | * Add a custom validator to to validate the schema. |
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| 559 | * |
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| 560 | * @param string $fieldname The name of the field to validate, if any. |
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| 561 | * |
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| 562 | * If you are adding a validator to a deeply nested field then separate the path with dots. |
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| 563 | * @param callable $callback The callback to validate with. |
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| 564 | * @return Schema Returns `$this` for fluent calls. |
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| 565 | */ |
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| 566 | 2 | public function addValidator($fieldname, callable $callback) { |
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| 570 | |||
| 571 | /** |
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| 572 | * Require one of a given set of fields in the schema. |
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| 573 | * |
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| 574 | * @param array $required The field names to require. |
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| 575 | * @param string $fieldname The name of the field to attach to. |
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| 576 | * @param int $count The count of required items. |
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| 577 | * @return Schema Returns `$this` for fluent calls. |
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| 578 | */ |
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| 579 | 1 | public function requireOneOf(array $required, $fieldname = '', $count = 1) { |
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| 628 | |||
| 629 | /** |
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| 630 | * Validate data against the schema. |
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| 631 | * |
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| 632 | * @param mixed $data The data to validate. |
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| 633 | * @param bool $sparse Whether or not this is a sparse validation. |
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| 634 | * @return mixed Returns a cleaned version of the data. |
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| 635 | * @throws ValidationException Throws an exception when the data does not validate against the schema. |
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| 636 | */ |
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| 637 | 130 | public function validate($data, $sparse = false) { |
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| 653 | |||
| 654 | /** |
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| 655 | * Validate data against the schema and return the result. |
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| 656 | * |
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| 657 | * @param mixed $data The data to validate. |
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| 658 | * @param bool $sparse Whether or not to do a sparse validation. |
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| 659 | * @return bool Returns true if the data is valid. False otherwise. |
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| 660 | */ |
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| 661 | 33 | public function isValid($data, $sparse = false) { |
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| 669 | |||
| 670 | /** |
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| 671 | * Validate a field. |
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| 672 | * |
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| 673 | * @param mixed $value The value to validate. |
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| 674 | * @param ValidationField $field A validation object to add errors to. |
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| 675 | * @param bool $sparse Whether or not this is a sparse validation. |
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| 676 | * @return mixed|Invalid Returns a clean version of the value with all extra fields stripped out or invalid if the value |
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| 677 | * is completely invalid. |
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| 678 | */ |
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| 679 | 130 | protected function validateField($value, ValidationField $field, $sparse = false) { |
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| 738 | |||
| 739 | /** |
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| 740 | * Validate an array. |
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| 741 | * |
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| 742 | * @param mixed $value The value to validate. |
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| 743 | * @param ValidationField $field The validation results to add. |
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| 744 | * @param bool $sparse Whether or not this is a sparse validation. |
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| 745 | * @return array|Invalid Returns an array or invalid if validation fails. |
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| 746 | */ |
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| 747 | 17 | protected function validateArray($value, ValidationField $field, $sparse = false) { |
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| 779 | |||
| 780 | /** |
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| 781 | * Validate a boolean value. |
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| 782 | * |
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| 783 | * @param mixed $value The value to validate. |
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| 784 | * @param ValidationField $field The validation results to add. |
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| 785 | * @return bool|Invalid Returns the cleaned value or invalid if validation fails. |
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| 786 | */ |
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| 787 | 21 | protected function validateBoolean($value, ValidationField $field) { |
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| 795 | |||
| 796 | /** |
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| 797 | * Validate a date time. |
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| 798 | * |
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| 799 | * @param mixed $value The value to validate. |
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| 800 | * @param ValidationField $field The validation results to add. |
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| 801 | * @return \DateTimeInterface|Invalid Returns the cleaned value or **null** if it isn't valid. |
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| 802 | */ |
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| 803 | 12 | protected function validateDatetime($value, ValidationField $field) { |
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| 804 | 12 | if ($value instanceof \DateTimeInterface) { |
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| 805 | // do nothing, we're good |
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| 806 | 12 | } elseif (is_string($value) && $value !== '' && !is_numeric($value)) { |
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| 807 | try { |
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| 808 | 6 | $dt = new \DateTimeImmutable($value); |
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| 809 | 5 | if ($dt) { |
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| 810 | 5 | $value = $dt; |
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| 811 | 5 | } else { |
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| 812 | $value = null; |
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| 813 | } |
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| 814 | 6 | } catch (\Exception $ex) { |
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| 815 | 1 | $value = Invalid::value(); |
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| 816 | } |
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| 817 | 10 | } elseif (is_int($value) && $value > 0) { |
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| 818 | 1 | $value = new \DateTimeImmutable('@'.(string)round($value)); |
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| 819 | 1 | } else { |
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| 820 | 3 | $value = Invalid::value(); |
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| 821 | } |
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| 822 | |||
| 823 | 12 | if (Invalid::isInvalid($value)) { |
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| 824 | 4 | $field->addTypeError('datetime'); |
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| 825 | 4 | } |
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| 826 | 12 | return $value; |
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| 827 | } |
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| 828 | |||
| 829 | /** |
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| 830 | * Validate a float. |
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| 831 | * |
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| 832 | * @param mixed $value The value to validate. |
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| 833 | * @param ValidationField $field The validation results to add. |
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| 834 | * @return float|Invalid Returns a number or **null** if validation fails. |
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| 835 | */ |
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| 836 | 8 | protected function validateNumber($value, ValidationField $field) { |
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| 844 | |||
| 845 | /** |
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| 846 | * Validate and integer. |
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| 847 | * |
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| 848 | * @param mixed $value The value to validate. |
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| 849 | * @param ValidationField $field The validation results to add. |
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| 850 | * @return int|Invalid Returns the cleaned value or **null** if validation fails. |
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| 851 | */ |
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| 852 | 28 | protected function validateInteger($value, ValidationField $field) { |
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| 861 | |||
| 862 | /** |
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| 863 | * Validate an object. |
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| 864 | * |
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| 865 | * @param mixed $value The value to validate. |
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| 866 | * @param ValidationField $field The validation results to add. |
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| 867 | * @param bool $sparse Whether or not this is a sparse validation. |
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| 868 | * @return object|Invalid Returns a clean object or **null** if validation fails. |
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| 869 | */ |
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| 870 | 87 | protected function validateObject($value, ValidationField $field, $sparse = false) { |
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| 882 | |||
| 883 | /** |
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| 884 | * Validate data against the schema and return the result. |
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| 885 | * |
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| 886 | * @param array|\ArrayAccess $data The data to validate. |
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| 887 | * @param ValidationField $field This argument will be filled with the validation result. |
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| 888 | * @param bool $sparse Whether or not this is a sparse validation. |
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| 889 | * @return array|Invalid Returns a clean array with only the appropriate properties and the data coerced to proper types. |
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| 890 | * or invalid if there are no valid properties. |
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| 891 | */ |
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| 892 | 86 | protected function validateProperties($data, ValidationField $field, $sparse = false) { |
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| 957 | |||
| 958 | /** |
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| 959 | * Validate a string. |
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| 960 | * |
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| 961 | * @param mixed $value The value to validate. |
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| 962 | * @param ValidationField $field The validation results to add. |
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| 963 | * @return string|Invalid Returns the valid string or **null** if validation fails. |
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| 964 | */ |
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| 965 | 56 | protected function validateString($value, ValidationField $field) { |
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| 1054 | |||
| 1055 | /** |
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| 1056 | * Validate a unix timestamp. |
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| 1057 | * |
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| 1058 | * @param mixed $value The value to validate. |
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| 1059 | * @param ValidationField $field The field being validated. |
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| 1060 | * @return int|Invalid Returns a valid timestamp or invalid if the value doesn't validate. |
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| 1061 | */ |
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| 1062 | 7 | protected function validateTimestamp($value, ValidationField $field) { |
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| 1073 | |||
| 1074 | /** |
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| 1075 | * Validate a null value. |
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| 1076 | * |
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| 1077 | * @param mixed $value The value to validate. |
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| 1078 | * @param ValidationField $field The error collector for the field. |
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| 1079 | * @return null|Invalid Returns **null** or invalid. |
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| 1080 | */ |
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| 1081 | protected function validateNull($value, ValidationField $field) { |
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| 1088 | |||
| 1089 | /** |
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| 1090 | * Validate a value against an enum. |
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| 1091 | * |
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| 1092 | * @param mixed $value The value to test. |
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| 1093 | * @param ValidationField $field The validation object for adding errors. |
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| 1094 | * @return mixed|Invalid Returns the value if it is one of the enumerated values or invalid otherwise. |
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| 1095 | */ |
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| 1096 | 128 | protected function validateEnum($value, ValidationField $field) { |
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| 1115 | |||
| 1116 | /** |
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| 1117 | * Call all of the filters attached to a field. |
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| 1118 | * |
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| 1119 | * @param mixed $value The field value being filtered. |
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| 1120 | * @param ValidationField $field The validation object. |
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| 1121 | * @return mixed Returns the filtered value. If there are no filters for the field then the original value is returned. |
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| 1122 | */ |
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| 1123 | 130 | protected function callFilters($value, ValidationField $field) { |
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| 1133 | |||
| 1134 | /** |
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| 1135 | * Call all of the validators attached to a field. |
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| 1136 | * |
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| 1137 | * @param mixed $value The field value being validated. |
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| 1138 | * @param ValidationField $field The validation object to add errors. |
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| 1139 | */ |
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| 1140 | 128 | protected function callValidators($value, ValidationField $field) { |
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| 1160 | |||
| 1161 | /** |
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| 1162 | * Specify data which should be serialized to JSON. |
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| 1163 | * |
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| 1164 | * This method specifically returns data compatible with the JSON schema format. |
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| 1165 | * |
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| 1166 | * @return mixed Returns data which can be serialized by **json_encode()**, which is a value of any type other than a resource. |
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| 1167 | * @link http://php.net/manual/en/jsonserializable.jsonserialize.php |
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| 1168 | * @link http://json-schema.org/ |
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| 1169 | */ |
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| 1170 | public function jsonSerialize() { |
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| 1205 | |||
| 1206 | /** |
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| 1207 | * Look up a type based on its alias. |
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| 1208 | * |
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| 1209 | * @param string $alias The type alias or type name to lookup. |
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| 1210 | * @return mixed |
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| 1211 | */ |
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| 1212 | 150 | protected function getType($alias) { |
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| 1223 | |||
| 1224 | /** |
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| 1225 | * Get the class that's used to contain validation information. |
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| 1226 | * |
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| 1227 | * @return Validation|string Returns the validation class. |
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| 1228 | */ |
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| 1229 | 130 | public function getValidationClass() { |
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| 1232 | |||
| 1233 | /** |
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| 1234 | * Set the class that's used to contain validation information. |
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| 1235 | * |
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| 1236 | * @param Validation|string $class Either the name of a class or a class that will be cloned. |
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| 1237 | * @return $this |
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| 1238 | */ |
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| 1239 | 1 | public function setValidationClass($class) { |
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| 1247 | |||
| 1248 | /** |
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| 1249 | * Create a new validation instance. |
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| 1250 | * |
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| 1251 | * @return Validation Returns a validation object. |
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| 1252 | */ |
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| 1253 | 130 | protected function createValidation() { |
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| 1263 | |||
| 1264 | /** |
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| 1265 | * Check whether or not a value is an array or accessible like an array. |
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| 1266 | * |
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| 1267 | * @param mixed $value The value to check. |
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| 1268 | * @return bool Returns **true** if the value can be used like an array or **false** otherwise. |
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| 1269 | */ |
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| 1270 | 87 | private function isArray($value) { |
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| 1273 | |||
| 1274 | /** |
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| 1275 | * Cast a value to an array. |
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| 1276 | * |
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| 1277 | * @param \Traversable $value The value to convert. |
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| 1278 | * @return array Returns an array. |
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| 1279 | */ |
||
| 1280 | private function toArray(\Traversable $value) { |
||
| 1286 | |||
| 1287 | /** |
||
| 1288 | * Return a sparse version of this schema. |
||
| 1289 | * |
||
| 1290 | * A sparse schema has no required properties. |
||
| 1291 | * |
||
| 1292 | * @return Schema Returns a new sparse schema. |
||
| 1293 | */ |
||
| 1294 | 2 | public function withSparse() { |
|
| 1298 | |||
| 1299 | /** |
||
| 1300 | * The internal implementation of `Schema::withSparse()`. |
||
| 1301 | * |
||
| 1302 | * @param array|Schema $schema The schema to make sparse. |
||
| 1303 | * @param \SplObjectStorage $schemas Collected sparse schemas that have already been made. |
||
| 1304 | * @return mixed |
||
| 1305 | */ |
||
| 1306 | 2 | private function withSparseInternal($schema, \SplObjectStorage $schemas) { |
|
| 1334 | |||
| 1335 | /** |
||
| 1336 | * Filter a field's value using built in and custom filters. |
||
| 1337 | * |
||
| 1338 | * @param mixed $value The original value of the field. |
||
| 1339 | * @param ValidationField $field The field information for the field. |
||
| 1340 | * @return mixed Returns the filtered field or the original field value if there are no filters. |
||
| 1341 | */ |
||
| 1342 | 130 | private function filterField($value, ValidationField $field) { |
|
| 1366 | |||
| 1367 | /** |
||
| 1368 | * Whether a offset exists. |
||
| 1369 | * |
||
| 1370 | * @param mixed $offset An offset to check for. |
||
| 1371 | * @return boolean true on success or false on failure. |
||
| 1372 | * @link http://php.net/manual/en/arrayaccess.offsetexists.php |
||
| 1373 | */ |
||
| 1374 | 3 | public function offsetExists($offset) { |
|
| 1377 | |||
| 1378 | /** |
||
| 1379 | * Offset to retrieve. |
||
| 1380 | * |
||
| 1381 | * @param mixed $offset The offset to retrieve. |
||
| 1382 | * @return mixed Can return all value types. |
||
| 1383 | * @link http://php.net/manual/en/arrayaccess.offsetget.php |
||
| 1384 | */ |
||
| 1385 | public function offsetGet($offset) { |
||
| 1388 | |||
| 1389 | /** |
||
| 1390 | * Offset to set. |
||
| 1391 | * |
||
| 1392 | * @param mixed $offset The offset to assign the value to. |
||
| 1393 | * @param mixed $value The value to set. |
||
| 1394 | * @link http://php.net/manual/en/arrayaccess.offsetset.php |
||
| 1395 | */ |
||
| 1396 | public function offsetSet($offset, $value) { |
||
| 1399 | |||
| 1400 | /** |
||
| 1401 | * Offset to unset. |
||
| 1402 | * |
||
| 1403 | * @param mixed $offset The offset to unset. |
||
| 1404 | * @link http://php.net/manual/en/arrayaccess.offsetunset.php |
||
| 1405 | */ |
||
| 1406 | public function offsetUnset($offset) { |
||
| 1409 | } |
||
| 1410 |
This check looks for multiple assignments in successive lines of code. It will report an issue if the operators are not in a straight line.
To visualize
will produce issues in the first and second line, while this second example
will produce no issues.