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 InternationalForms 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 InternationalForms, and based on these observations, apply Extract Interface, too.
1 | <?php |
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10 | class InternationalForms implements NodeInterface |
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11 | { |
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12 | /** |
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13 | * @var string |
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14 | */ |
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15 | private $type = self::TYPE_INVOICE; |
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16 | |||
17 | /** |
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18 | * Form Types. |
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19 | */ |
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20 | const TYPE_INVOICE = '01'; |
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21 | const TYPE_CO = '03'; |
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22 | const TYPE_NAFTA_CO = '04'; |
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23 | const TYPE_PARTIAL_INVOICE = '05'; |
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24 | const TYPE_PACKINGLIST = '06'; |
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25 | const TYPE_CUSTOMER_GENERATED_FORMS = '07'; |
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26 | const TYPE_AIR_FREIGHT_PACKING_LIST = '08'; |
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27 | const TYPE_CN22_FORMS = '09'; |
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28 | const TYPE_UPS_PREMIUM_CARE = '10'; |
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29 | const TYPE_EEI_SHIPMENT_WITH_RETURN_SERVICE = '11'; |
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30 | |||
31 | private static $typeNames = [ |
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32 | '01' => 'Invoice', |
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33 | '03' => 'CO', |
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34 | '04' => 'NAFTA CO', |
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35 | '05' => 'Partial Invoice', |
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36 | '06' => 'Packinglist', |
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37 | '07' => 'Customer Generated Forms', |
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38 | '08' => 'Air Freight Packing List', |
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39 | '09' => 'CN22 Forms', |
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40 | '10' => 'UPS Premium Care', |
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41 | '11' => 'EEI. For shipment with return service', |
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42 | ]; |
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43 | |||
44 | /** |
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45 | * @var string |
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46 | */ |
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47 | private $termsOfShipment; |
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48 | |||
49 | /** |
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50 | * Terms of Shipment. |
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51 | */ |
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52 | const TOS_COST_AND_FREIGHT = 'CFR'; |
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53 | const TOS_COST_INSURANCE_AND_FREIGHT = 'CIF'; |
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54 | const TOS_CARRIAGE_AND_INSURANCE_PAID = 'CIP'; |
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55 | const TOS_CARRIAGE_PAID_TO = 'CPT'; |
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56 | const TOS_DELIVERED_AT_FRONTIER = 'DAF'; |
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57 | const TOS_DELIVERY_DUTY_PAID = 'DDP'; |
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58 | const TOS_DELIVERY_DUTY_UNPAID = 'DDU'; |
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59 | const TOS_DELIVERED_EX_QUAY = 'DEQ'; |
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60 | const TOS_DELIVERED_EX_SHIP = 'DES'; |
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61 | const TOS_EX_WORKS = 'EXW'; |
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62 | const TOS_FREE_ALONGSIDE_SHIP = 'FAS'; |
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63 | const TOS_FREE_CARRIER = 'FCA'; |
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64 | const TOS_FREE_ON_BOARD = 'FOB'; |
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65 | |||
66 | private static $termsOfShipmentNames = [ |
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67 | 'CFR' => 'Cost and Freight', |
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68 | 'CIF' => 'Cost, Insurance and Freight', |
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69 | 'CIP' => 'Carriage and Insurance Paid', |
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70 | 'CPT' => 'Carriage Paid To', |
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71 | 'DAF' => 'Delivered at Frontier', |
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72 | 'DDP' => 'Delivery Duty Paid', |
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73 | 'DDU' => 'Delivery Duty Unpaid', |
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74 | 'DEQ' => 'Delivered Ex Quay', |
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75 | 'DES' => 'Delivered Ex Ship', |
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76 | 'EXW' => 'Ex Works', |
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77 | 'FAS' => 'Free Alongside Ship', |
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78 | 'FCA' => 'Free Carrier', |
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79 | 'FOB' => 'Free On Board', |
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80 | ]; |
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81 | |||
82 | /** |
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83 | * @var string |
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84 | */ |
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85 | private $reasonForExport; |
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86 | |||
87 | /** |
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88 | * Reasons for export. |
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89 | */ |
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90 | const RFE_SALE = 'SALE'; |
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91 | const RFE_GIFT = 'GIFT'; |
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92 | const RFE_SAMPLE = 'SAMPLE'; |
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93 | const RFE_RETURN = 'RETURN'; |
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94 | const RFE_REPAIR = 'REPAIR'; |
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95 | const RFE_INTERCOMPANYDATA = 'INTERCOMPANYDATA'; |
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96 | |||
97 | /** |
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98 | * @var string |
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99 | */ |
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100 | private $comments; |
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101 | |||
102 | /** |
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103 | * @var string |
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104 | */ |
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105 | private $currencyCode; |
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106 | |||
107 | /** |
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108 | * @var string |
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109 | */ |
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110 | private $invoiceNumber; |
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111 | |||
112 | /** |
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113 | * @var DateTime |
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114 | */ |
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115 | private $invoiceDate; |
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116 | |||
117 | /** |
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118 | * @var string |
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119 | */ |
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120 | private $purchaseOrderNumber; |
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121 | |||
122 | /** |
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123 | * @var array |
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124 | */ |
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125 | private $products = []; |
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126 | |||
127 | /** |
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128 | * @var Discount |
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129 | */ |
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130 | private $discount; |
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131 | |||
132 | /** |
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133 | * @var FreightCharges |
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134 | */ |
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135 | private $freightCharges; |
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136 | |||
137 | /** |
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138 | * @var string $declarationStatement |
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139 | */ |
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140 | private $declarationStatement; |
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141 | |||
142 | /** |
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143 | * @return array |
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144 | */ |
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145 | public static function getTypes() |
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149 | |||
150 | /** |
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151 | * @return string |
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152 | */ |
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153 | public function getTypeName() |
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157 | |||
158 | /** |
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159 | * @param null|object $attributes |
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160 | */ |
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161 | public function __construct($attributes = null) |
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190 | |||
191 | /** |
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192 | * @param $type string |
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193 | * |
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194 | * @return $this |
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195 | */ |
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196 | public function setType($type) |
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202 | |||
203 | /** |
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204 | * @return string |
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205 | */ |
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206 | public function getType() |
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210 | |||
211 | /** |
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212 | * @param $freightCharges FreightCharges |
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213 | * |
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214 | * @return $this |
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215 | */ |
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216 | public function setFreightCharges(FreightCharges $freightCharges) |
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222 | |||
223 | /** |
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224 | * @return FreightCharges |
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225 | */ |
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226 | public function getFreightCharges() |
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230 | |||
231 | /** |
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232 | * @param $discount Discount |
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233 | * |
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234 | * @return $this |
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235 | */ |
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236 | public function setDiscount(Discount $discount) |
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242 | |||
243 | /** |
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244 | * @return Discount |
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245 | */ |
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246 | public function getDiscount() |
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250 | |||
251 | /** |
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252 | * @param Product $product |
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253 | * |
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254 | * @return $this |
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255 | */ |
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256 | public function addProduct(Product $product) |
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262 | |||
263 | /** |
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264 | * @return array |
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265 | */ |
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266 | public function getProducts() |
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270 | |||
271 | /** |
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272 | * @param null|DOMDocument $document |
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273 | * |
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274 | * @return DOMElement |
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275 | */ |
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276 | public function toNode(DOMDocument $document = null) |
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323 | |||
324 | /** |
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325 | * @param $number string |
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326 | * |
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327 | * @return $this |
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328 | */ |
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329 | public function setInvoiceNumber($number) |
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335 | |||
336 | /** |
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337 | * @return string |
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338 | */ |
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339 | public function getInvoiceNumber() |
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343 | |||
344 | /** |
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345 | * @param DateTime $date |
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346 | * |
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347 | * @return $this |
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348 | */ |
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349 | public function setInvoiceDate(DateTime $date) |
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355 | |||
356 | /** |
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357 | * @return DateTime |
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358 | */ |
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359 | public function getInvoiceDate() |
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363 | |||
364 | /** |
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365 | * @param $number |
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366 | * |
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367 | * @return $this |
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368 | */ |
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369 | public function setPurchaseOrderNumber($number) |
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375 | |||
376 | /** |
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377 | * @return string |
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378 | */ |
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379 | public function getPurchaseOrderNumber() |
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383 | |||
384 | /** |
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385 | * @param $terms |
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386 | * |
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387 | * @return $this |
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388 | */ |
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389 | public function setTermsOfShipment($terms) |
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395 | |||
396 | /** |
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397 | * @return string |
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398 | */ |
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399 | public function getTermsOfShipment() |
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403 | |||
404 | /** |
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405 | * @param $reason |
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406 | * |
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407 | * @return $this |
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408 | */ |
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409 | public function setReasonForExport($reason) |
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419 | |||
420 | /** |
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421 | * @return string |
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422 | */ |
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423 | public function getReasonForExport() |
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427 | |||
428 | /** |
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429 | * @param $comments |
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430 | * |
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431 | * @return $this |
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432 | */ |
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433 | View Code Duplication | public function setComments($comments) |
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443 | |||
444 | /** |
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445 | * @return string |
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446 | */ |
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447 | public function getComments() |
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451 | |||
452 | /** |
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453 | * @param $code |
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454 | * |
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455 | * @return $this |
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456 | */ |
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457 | public function setCurrencyCode($code) |
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463 | |||
464 | /** |
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465 | * @return string |
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466 | */ |
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467 | public function getCurrencyCode() |
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471 | |||
472 | /** |
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473 | * @return string |
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474 | */ |
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475 | public function getDeclarationStatement() |
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479 | |||
480 | public function setDeclarationStatement($statement) |
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486 | } |
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487 |
This check marks private properties in classes that are never used. Those properties can be removed.