Complex classes like WC_Order_Item_Product 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 WC_Order_Item_Product, and based on these observations, apply Extract Interface, too.
1 | <?php |
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11 | class WC_Order_Item_Product extends WC_Order_Item { |
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12 | |||
13 | /** |
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14 | * Data properties of this order item object. |
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15 | * @since 2.6.0 |
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16 | * @var array |
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17 | */ |
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18 | protected $_data = array( |
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19 | 'order_id' => 0, |
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20 | 'order_item_id' => 0, |
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21 | 'name' => '', |
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22 | 'product_id' => 0, |
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23 | 'variation_id' => 0, |
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24 | 'qty' => 0, |
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25 | 'tax_class' => '', |
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26 | 'subtotal' => 0, |
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27 | 'subtotal_tax' => 0, |
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28 | 'total' => 0, |
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29 | 'total_tax' => 0, |
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30 | 'taxes' => array( |
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31 | 'subtotal' => array(), |
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32 | 'total' => array() |
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33 | ), |
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34 | 'meta_data' => array(), |
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35 | ); |
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36 | |||
37 | /** |
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38 | * offsetGet for ArrayAccess/Backwards compatibility. |
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39 | * @todo Add deprecation notices in future release. |
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40 | * @param string $offset |
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41 | * @return mixed |
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42 | */ |
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43 | public function offsetGet( $offset ) { |
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61 | |||
62 | /** |
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63 | * offsetExists for ArrayAccess |
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64 | * @param string $offset |
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65 | * @return bool |
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66 | */ |
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67 | public function offsetExists( $offset ) { |
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73 | |||
74 | /** |
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75 | * Read/populate data properties specific to this order item. |
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76 | */ |
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77 | public function read( $id ) { |
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91 | |||
92 | /** |
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93 | * Save properties specific to this order item. |
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94 | */ |
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95 | public function save() { |
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109 | |||
110 | /** |
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111 | * Internal meta keys we don't want exposed as part of meta_data. |
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112 | * @return array() |
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113 | */ |
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114 | protected function get_internal_meta_keys() { |
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117 | |||
118 | /** |
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119 | * Get the associated product. |
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120 | * @return WC_Product|bool |
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121 | */ |
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122 | public function get_product() { |
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129 | |||
130 | /** |
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131 | * Get tax status. |
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132 | * @return string |
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133 | */ |
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134 | public function get_tax_status() { |
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138 | |||
139 | /* |
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140 | |-------------------------------------------------------------------------- |
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141 | | Setters |
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142 | |-------------------------------------------------------------------------- |
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143 | */ |
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144 | |||
145 | /** |
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146 | * Set qty. |
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147 | * @param int $value |
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148 | */ |
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149 | public function set_qty( $value ) { |
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152 | |||
153 | /** |
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154 | * Set tax class. |
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155 | * @param string $value |
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156 | */ |
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157 | public function set_tax_class( $value ) { |
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160 | |||
161 | /** |
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162 | * Set Product ID |
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163 | * @param int $value |
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164 | */ |
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165 | public function set_product_id( $value ) { |
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168 | |||
169 | /** |
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170 | * Set variation ID. |
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171 | * @param int $value |
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172 | */ |
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173 | public function set_variation_id( $value ) { |
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176 | |||
177 | /** |
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178 | * Line subtotal (before discounts). |
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179 | * @param string $value |
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180 | */ |
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181 | public function set_subtotal( $value ) { |
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184 | |||
185 | /** |
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186 | * Line total (after discounts). |
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187 | * @param string $value |
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188 | */ |
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189 | public function set_total( $value ) { |
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192 | |||
193 | /** |
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194 | * Line subtotal tax (before discounts). |
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195 | * @param string $value |
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196 | */ |
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197 | public function set_subtotal_tax( $value ) { |
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200 | |||
201 | /** |
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202 | * Line total tax (after discounts). |
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203 | * @param string $value |
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204 | */ |
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205 | public function set_total_tax( $value ) { |
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208 | |||
209 | /** |
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210 | * Set line taxes. |
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211 | * @param array $raw_tax_data |
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212 | */ |
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213 | public function set_taxes( $raw_tax_data ) { |
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225 | |||
226 | /** |
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227 | * Set variation data (stored as meta data - write only). |
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228 | * @param array $data Key/Value pairs |
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229 | */ |
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230 | public function set_variations( $data ) { |
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235 | |||
236 | /* |
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237 | |-------------------------------------------------------------------------- |
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238 | | Getters |
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239 | |-------------------------------------------------------------------------- |
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240 | */ |
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241 | |||
242 | /** |
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243 | * Get order item type. |
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244 | * @return string |
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245 | */ |
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246 | public function get_type() { |
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249 | |||
250 | /** |
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251 | * Get product ID. |
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252 | * @return int |
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253 | */ |
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254 | public function get_product_id() { |
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257 | |||
258 | /** |
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259 | * Get variation ID. |
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260 | * @return int |
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261 | */ |
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262 | public function get_variation_id() { |
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265 | |||
266 | /** |
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267 | * Get qty. |
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268 | * @return int |
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269 | */ |
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270 | public function get_qty() { |
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273 | |||
274 | /** |
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275 | * Get tax class. |
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276 | * @return string |
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277 | */ |
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278 | public function get_tax_class() { |
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281 | |||
282 | /** |
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283 | * Get subtotal. |
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284 | * @return string |
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285 | */ |
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286 | public function get_subtotal() { |
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289 | |||
290 | /** |
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291 | * Get subtotal tax. |
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292 | * @return string |
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293 | */ |
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294 | public function get_subtotal_tax() { |
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297 | |||
298 | /** |
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299 | * Get total. |
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300 | * @return string |
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301 | */ |
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302 | public function get_total() { |
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305 | |||
306 | /** |
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307 | * Get total tax. |
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308 | * @return string |
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309 | */ |
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310 | public function get_total_tax() { |
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313 | |||
314 | /** |
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315 | * Get fee taxes. |
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316 | * @return array |
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317 | */ |
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318 | public function get_taxes() { |
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321 | |||
322 | /** |
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323 | * Get meta data. |
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324 | * @return array of key/value pairs |
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325 | */ |
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326 | public function get_meta_data() { |
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329 | } |
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330 |
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