Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like CMB2_REST 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 CMB2_REST, and based on these observations, apply Extract Interface, too.
1 | <?php |
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14 | class CMB2_REST extends CMB2_Hookup_Base { |
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15 | |||
16 | /** |
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17 | * The current CMB2 REST endpoint version |
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18 | * @var string |
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19 | * @since 2.2.0 |
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20 | */ |
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21 | const VERSION = '1'; |
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22 | |||
23 | /** |
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24 | * The CMB2 REST base namespace (v should always be followed by $version) |
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25 | * @var string |
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26 | * @since 2.2.0 |
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27 | */ |
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28 | const BASE = 'cmb2/v1'; |
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29 | |||
30 | /** |
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31 | * @var CMB2[] objects |
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32 | * @since 2.2.0 |
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33 | */ |
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34 | protected static $boxes; |
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35 | |||
36 | /** |
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37 | * Whether metabox fields can be read via REST API |
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38 | * @var bool |
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39 | * @since 2.2.0 |
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40 | */ |
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41 | protected $can_read = true; |
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42 | |||
43 | /** |
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44 | * Array of readable field objects. |
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45 | * @var CMB2_Field[] |
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46 | * @since 2.2.0 |
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47 | */ |
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48 | protected static $read_fields = array(); |
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49 | |||
50 | /** |
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51 | * Array of writeable field objects. |
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52 | * @var CMB2_Field[] |
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53 | * @since 2.2.0 |
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54 | */ |
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55 | protected static $write_fields = array(); |
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56 | |||
57 | /** |
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58 | * Whether metabox fields can be written via REST API |
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59 | * @var bool |
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60 | * @since 2.2.0 |
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61 | */ |
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62 | protected $can_write = false; |
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63 | |||
64 | public function __construct( CMB2 $cmb ) { |
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72 | |||
73 | public function universal_hooks() { |
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83 | |||
84 | public function init_routes() { |
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93 | |||
94 | public static function register_fields() { |
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112 | |||
113 | protected function prepare_read_write_fields() { |
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125 | |||
126 | View Code Duplication | protected function maybe_add_read_field( $field_id, $show_in_rest ) { |
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135 | |||
136 | View Code Duplication | protected function maybe_add_write_field( $field_id, $show_in_rest ) { |
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145 | |||
146 | /** |
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147 | * Handler for getting custom field data. |
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148 | * @since 2.2.0 |
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149 | * @param array $object The object from the response |
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150 | * @param string $field_id Name of field |
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151 | * @param WP_REST_Request $request Current request |
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152 | * @return mixed |
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153 | */ |
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154 | public static function get_restable_field_values( $object, $field_id, $request ) { |
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175 | |||
176 | /** |
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177 | * Handler for updating custom field data. |
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178 | * @since 2.2.0 |
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179 | * @param mixed $value The value of the field |
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180 | * @param object $object The object from the response |
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181 | * @param string $field_id Name of field |
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182 | * @return bool|int |
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183 | */ |
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184 | public static function update_restable_field_values( $values, $object, $field_id ) { |
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244 | |||
245 | /** |
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246 | * Filter whether a meta key is protected. |
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247 | * @since 2.2.0 |
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248 | * @param bool $protected Whether the key is protected. Default false. |
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249 | * @param string $meta_key Meta key. |
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250 | * @param string $meta_type Meta type. |
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251 | */ |
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252 | public function is_protected_meta( $protected, $meta_key, $meta_type ) { |
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259 | |||
260 | public function field_can_update( $field_id ) { |
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270 | |||
271 | protected static function get_object_data( $object ) { |
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293 | |||
294 | } |
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295 |
You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.