Complex classes like Invoice 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 Invoice, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 13 | class Invoice implements CreatableFromArray  | 
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| 14 | { | 
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| 15 | /**  | 
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| 16 | * @var string  | 
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| 17 | */  | 
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| 18 | private $id;  | 
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| 19 | |||
| 20 | /**  | 
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| 21 | * @var int  | 
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| 22 | */  | 
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| 23 | private $invoiceNo;  | 
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| 24 | |||
| 25 | /**  | 
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| 26 | * @var int  | 
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| 27 | */  | 
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| 28 | private $ocrNumber;  | 
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| 29 | |||
| 30 | /**  | 
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| 31 | * @var Customer  | 
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| 32 | */  | 
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| 33 | private $customer;  | 
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| 34 | |||
| 35 | /**  | 
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| 36 | * @var \Billogram\Model\Invoice\Item[]  | 
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| 37 | */  | 
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| 38 | private $items;  | 
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| 39 | |||
| 40 | /**  | 
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| 41 | * @var  | 
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| 42 | */  | 
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| 43 | private $invoiceDate;  | 
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| 44 | |||
| 45 | /**  | 
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| 46 | * @var \DateTime  | 
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| 47 | */  | 
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| 48 | private $dueDate;  | 
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| 49 | |||
| 50 | /**  | 
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| 51 | * @var int  | 
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| 52 | */  | 
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| 53 | private $dueDays;  | 
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| 54 | |||
| 55 | /**  | 
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| 56 | * @var int  | 
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| 57 | */  | 
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| 58 | private $invoiceFee;  | 
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| 59 | /**  | 
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| 60 | * @var int  | 
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| 61 | */  | 
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| 62 | private $invoiceFeeVat;  | 
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| 63 | |||
| 64 | /**  | 
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| 65 | * @var int  | 
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| 66 | */  | 
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| 67 | private $reminderFee;  | 
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| 68 | |||
| 69 | /**  | 
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| 70 | * @var int  | 
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| 71 | */  | 
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| 72 | private $interestRate;  | 
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| 73 | |||
| 74 | /**  | 
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| 75 | * @var int  | 
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| 76 | */  | 
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| 77 | private $interestFee;  | 
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| 78 | |||
| 79 | /**  | 
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| 80 | * @var string  | 
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| 81 | */  | 
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| 82 | private $currency;  | 
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| 83 | |||
| 84 | /**  | 
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| 85 | * @var AdditionalInformation  | 
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| 86 | */  | 
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| 87 | private $info;  | 
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| 88 | |||
| 89 | /**  | 
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| 90 | * @var RegionalInformation  | 
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| 91 | */  | 
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| 92 | private $regionalSweden;  | 
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| 93 | |||
| 94 | /**  | 
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| 95 | * @var string  | 
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| 96 | */  | 
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| 97 | private $deliveryMethod;  | 
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| 98 | |||
| 99 | /**  | 
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| 100 | * @var string  | 
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| 101 | */  | 
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| 102 | private $state;  | 
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| 103 | |||
| 104 | /**  | 
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| 105 | * @var string  | 
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| 106 | */  | 
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| 107 | private $url;  | 
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| 108 | |||
| 109 | /**  | 
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| 110 | * @var array  | 
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| 111 | */  | 
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| 112 | private $flags;  | 
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| 113 | |||
| 114 | /**  | 
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| 115 | * @var EventData  | 
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| 116 | */  | 
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| 117 | private $events;  | 
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| 118 | |||
| 119 | /**  | 
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| 120 | * @var int  | 
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| 121 | */  | 
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| 122 | private $remainingSum;  | 
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| 123 | |||
| 124 | /**  | 
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| 125 | * @var int  | 
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| 126 | */  | 
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| 127 | private $totalSum;  | 
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| 128 | |||
| 129 | /**  | 
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| 130 | * @var int  | 
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| 131 | */  | 
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| 132 | private $roundingValue;  | 
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| 133 | |||
| 134 | /**  | 
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| 135 | * @var bool  | 
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| 136 | */  | 
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| 137 | private $automaticReminders = true;  | 
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| 138 | |||
| 139 | /**  | 
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| 140 | * @var AutomaticReminder[]  | 
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| 141 | */  | 
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| 142 | private $automaticRemindersSettings;  | 
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| 143 | |||
| 144 | /**  | 
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| 145 | * @var int  | 
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| 146 | */  | 
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| 147 | private $reminderCount;  | 
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| 148 | |||
| 149 | /**  | 
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| 150 | * @var \DateTime  | 
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| 151 | */  | 
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| 152 | private $createdAt;  | 
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| 153 | |||
| 154 | /**  | 
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| 155 | * @var \DateTime  | 
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| 156 | */  | 
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| 157 | private $attestedAt;  | 
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| 158 | |||
| 159 | /**  | 
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| 160 | * @var \DateTime  | 
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| 161 | */  | 
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| 162 | private $updateAt;  | 
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| 163 | |||
| 164 | /**  | 
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| 165 | * @var BillogramCallback  | 
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| 166 | */  | 
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| 167 | private $callbacks;  | 
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| 168 | |||
| 169 | /**  | 
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| 170 | * @var DetailedSums  | 
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| 171 | */  | 
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| 172 | private $detailedSums;  | 
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| 173 | |||
| 174 | /**  | 
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| 175 | * @var string  | 
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| 176 | */  | 
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| 177 | private $attachment;  | 
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| 178 | |||
| 179 | /**  | 
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| 180 | * @var ReminderCollection  | 
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| 181 | */  | 
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| 182 | private $automaticCollection;  | 
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| 183 | |||
| 184 | /**  | 
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| 185 | * @return string  | 
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| 186 | */  | 
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| 187 | public function getId(): string  | 
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| 191 | |||
| 192 | /**  | 
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| 193 | * @param string $id  | 
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| 194 | *  | 
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| 195 | * @return Invoice  | 
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| 196 | */  | 
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| 197 | public function withId(string $id)  | 
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| 204 | |||
| 205 | /**  | 
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| 206 | * @return int  | 
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| 207 | */  | 
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| 208 | public function getInvoiceNo(): int  | 
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| 212 | |||
| 213 | /**  | 
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| 214 | * @param int $invoiceNo  | 
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| 215 | *  | 
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| 216 | * @return Invoice  | 
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| 217 | */  | 
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| 218 | public function withInvoiceNo(int $invoiceNo)  | 
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| 225 | |||
| 226 | /**  | 
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| 227 | * @return int  | 
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| 228 | */  | 
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| 229 | public function getOcrNumber(): int  | 
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| 233 | |||
| 234 | /**  | 
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| 235 | * @param int $ocrNumber  | 
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| 236 | *  | 
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| 237 | * @return Invoice  | 
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| 238 | */  | 
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| 239 | public function withOcrNumber(int $ocrNumber)  | 
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| 246 | |||
| 247 | /**  | 
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| 248 | * @return Customer  | 
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| 249 | */  | 
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| 250 | public function getCustomer(): Customer  | 
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| 254 | |||
| 255 | /**  | 
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| 256 | * @param Customer $customer  | 
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| 257 | *  | 
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| 258 | * @return Invoice  | 
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| 259 | */  | 
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| 260 | 2 | public function withCustomer(Customer $customer)  | 
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| 267 | |||
| 268 | /**  | 
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| 269 | * @return \Billogram\Model\Invoice\Item[]  | 
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| 270 | */  | 
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| 271 | public function getItems(): array  | 
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| 275 | |||
| 276 | /**  | 
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| 277 | * @param \Billogram\Model\Invoice\Item[] $items  | 
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| 278 | *  | 
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| 279 | * @return Invoice  | 
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| 280 | */  | 
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| 281 | 2 | public function withItems(array $items)  | 
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| 288 | |||
| 289 | /**  | 
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| 290 | * @return int  | 
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| 291 | */  | 
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| 292 | public function getInvoiceDate(): int  | 
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| 296 | |||
| 297 | /**  | 
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| 298 | * @param string $invoiceDate  | 
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| 299 | *  | 
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| 300 | * @return Invoice  | 
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| 301 | */  | 
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| 302 | 2 | public function withInvoiceDate(string $invoiceDate)  | 
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| 309 | |||
| 310 | /**  | 
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| 311 | * @return \DateTime  | 
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| 312 | */  | 
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| 313 | public function getDueDate(): \DateTime  | 
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| 317 | |||
| 318 | /**  | 
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| 319 | * @param \DateTime $dueDate  | 
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| 320 | *  | 
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| 321 | * @return Invoice  | 
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| 322 | */  | 
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| 323 | public function withDueDate(\DateTime $dueDate)  | 
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| 330 | |||
| 331 | /**  | 
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| 332 | * @return int  | 
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| 333 | */  | 
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| 334 | public function getDueDays(): int  | 
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| 338 | |||
| 339 | /**  | 
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| 340 | * @param int $dueDays  | 
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| 341 | *  | 
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| 342 | * @return Invoice  | 
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| 343 | */  | 
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| 344 | public function withDueDays(int $dueDays)  | 
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| 351 | |||
| 352 | /**  | 
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| 353 | * @return int  | 
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| 354 | */  | 
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| 355 | public function getInvoiceFee(): int  | 
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| 359 | |||
| 360 | /**  | 
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| 361 | * @param int $invoiceFee  | 
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| 362 | *  | 
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| 363 | * @return Invoice  | 
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| 364 | */  | 
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| 365 | public function withInvoiceFee(int $invoiceFee)  | 
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| 372 | |||
| 373 | /**  | 
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| 374 | * @return int  | 
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| 375 | */  | 
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| 376 | public function getInvoiceFeeVat(): int  | 
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| 380 | |||
| 381 | /**  | 
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| 382 | * @param int $invoiceFeeVat  | 
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| 383 | *  | 
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| 384 | * @return Invoice  | 
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| 385 | */  | 
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| 386 | public function withInvoiceFeeVat(int $invoiceFeeVat)  | 
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| 393 | |||
| 394 | /**  | 
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| 395 | * @return int  | 
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| 396 | */  | 
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| 397 | public function getReminderFee(): int  | 
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| 401 | |||
| 402 | /**  | 
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| 403 | * @param int $reminderFee  | 
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| 404 | *  | 
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| 405 | * @return Invoice  | 
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| 406 | */  | 
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| 407 | public function withReminderFee(int $reminderFee)  | 
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| 414 | |||
| 415 | /**  | 
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| 416 | * @return int  | 
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| 417 | */  | 
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| 418 | public function getInterestRate(): int  | 
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| 422 | |||
| 423 | /**  | 
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| 424 | * @param int $interestRate  | 
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| 425 | *  | 
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| 426 | * @return Invoice  | 
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| 427 | */  | 
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| 428 | public function withInterestRate(int $interestRate)  | 
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| 435 | |||
| 436 | /**  | 
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| 437 | * @return int  | 
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| 438 | */  | 
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| 439 | public function getInterestFee(): int  | 
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| 443 | |||
| 444 | /**  | 
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| 445 | * @param int $interestFee  | 
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| 446 | *  | 
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| 447 | * @return Invoice  | 
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| 448 | */  | 
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| 449 | public function withInterestFee(int $interestFee)  | 
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| 456 | |||
| 457 | /**  | 
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| 458 | * @return string  | 
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| 459 | */  | 
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| 460 | public function getCurrency(): string  | 
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| 464 | |||
| 465 | /**  | 
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| 466 | * @param string $currency  | 
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| 467 | *  | 
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| 468 | * @return Invoice  | 
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| 469 | */  | 
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| 470 | public function withCurrency(string $currency)  | 
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| 477 | |||
| 478 | /**  | 
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| 479 | * @return AdditionalInformation  | 
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| 480 | */  | 
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| 481 | public function getInfo(): AdditionalInformation  | 
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| 485 | |||
| 486 | /**  | 
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| 487 | * @param AdditionalInformation $info  | 
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| 488 | *  | 
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| 489 | * @return Invoice  | 
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| 490 | */  | 
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| 491 | public function withInfo(AdditionalInformation $info)  | 
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| 498 | |||
| 499 | /**  | 
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| 500 | * @return RegionalInformation  | 
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| 501 | */  | 
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| 502 | public function getRegionalSweden(): RegionalInformation  | 
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| 506 | |||
| 507 | /**  | 
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| 508 | * @param RegionalInformation $regionalSweden  | 
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| 509 | *  | 
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| 510 | * @return Invoice  | 
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| 511 | */  | 
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| 512 | public function withRegionalSweden(RegionalInformation $regionalSweden)  | 
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| 519 | |||
| 520 | /**  | 
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| 521 | * @return string  | 
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| 522 | */  | 
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| 523 | public function getDeliveryMethod(): string  | 
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| 527 | |||
| 528 | /**  | 
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| 529 | * @param string $deliveryMethod  | 
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| 530 | *  | 
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| 531 | * @return Invoice  | 
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| 532 | */  | 
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| 533 | public function withDeliveryMethod(string $deliveryMethod)  | 
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| 540 | |||
| 541 | /**  | 
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| 542 | * @return string  | 
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| 543 | */  | 
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| 544 | public function getState(): string  | 
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| 548 | |||
| 549 | /**  | 
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| 550 | * @param string $state  | 
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| 551 | *  | 
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| 552 | * @return Invoice  | 
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| 553 | */  | 
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| 554 | public function swithState(string $state)  | 
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| 561 | |||
| 562 | /**  | 
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| 563 | * @return string  | 
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| 564 | */  | 
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| 565 | public function getUrl(): string  | 
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| 569 | |||
| 570 | /**  | 
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| 571 | * @param string $url  | 
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| 572 | *  | 
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| 573 | * @return Invoice  | 
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| 574 | */  | 
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| 575 | public function withUrl(string $url)  | 
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| 582 | |||
| 583 | /**  | 
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| 584 | * @return array  | 
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| 585 | */  | 
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| 586 | public function getFlags(): array  | 
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| 590 | |||
| 591 | /**  | 
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| 592 | * @param array $flags  | 
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| 593 | *  | 
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| 594 | * @return Invoice  | 
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| 595 | */  | 
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| 596 | public function withFlags(array $flags)  | 
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| 603 | |||
| 604 | /**  | 
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| 605 | * @return EventData  | 
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| 606 | */  | 
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| 607 | public function getEvents(): EventData  | 
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| 611 | |||
| 612 | /**  | 
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| 613 | * @param EventData $events  | 
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| 614 | *  | 
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| 615 | * @return Invoice  | 
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| 616 | */  | 
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| 617 | public function withEvents(EventData $events)  | 
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| 624 | |||
| 625 | /**  | 
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| 626 | * @return int  | 
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| 627 | */  | 
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| 628 | public function getRemainingSum(): int  | 
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| 632 | |||
| 633 | /**  | 
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| 634 | * @param int $remainingSum  | 
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| 635 | *  | 
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| 636 | * @return Invoice  | 
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| 637 | */  | 
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| 638 | public function withRemainingSum(int $remainingSum)  | 
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| 645 | |||
| 646 | /**  | 
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| 647 | * @return int  | 
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| 648 | */  | 
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| 649 | public function getTotalSum(): int  | 
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| 653 | |||
| 654 | /**  | 
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| 655 | * @param int $totalSum  | 
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| 656 | *  | 
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| 657 | * @return Invoice  | 
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| 658 | */  | 
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| 659 | public function withTotalSum(int $totalSum)  | 
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| 666 | |||
| 667 | /**  | 
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| 668 | * @return bool  | 
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| 669 | */  | 
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| 670 | public function isAutomaticReminders(): bool  | 
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| 674 | |||
| 675 | /**  | 
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| 676 | * @param bool $automaticReminders  | 
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| 677 | *  | 
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| 678 | * @return Invoice  | 
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| 679 | */  | 
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| 680 | public function withAutomaticReminders(bool $automaticReminders)  | 
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| 687 | |||
| 688 | /**  | 
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| 689 | * @return AutomaticReminder[]  | 
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| 690 | */  | 
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| 691 | public function getAutomaticRemindersSettings(): array  | 
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| 695 | |||
| 696 | /**  | 
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| 697 | * @param AutomaticReminder[] $automaticRemindersSettings  | 
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| 698 | *  | 
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| 699 | * @return Invoice  | 
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| 700 | */  | 
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| 701 | public function withAutomaticRemindersSettings(array $automaticRemindersSettings)  | 
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| 708 | |||
| 709 | /**  | 
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| 710 | * @return int  | 
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| 711 | */  | 
            ||
| 712 | public function getReminderCount(): int  | 
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| 716 | |||
| 717 | /**  | 
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| 718 | * @param int $reminderCount  | 
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| 719 | *  | 
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| 720 | * @return Invoice  | 
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| 721 | */  | 
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| 722 | public function withReminderCount(int $reminderCount)  | 
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| 729 | |||
| 730 | /**  | 
            ||
| 731 | * @return \DateTime  | 
            ||
| 732 | */  | 
            ||
| 733 | public function getCreatedAt(): \DateTime  | 
            ||
| 737 | |||
| 738 | /**  | 
            ||
| 739 | * @param \DateTime $createdAt  | 
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| 740 | *  | 
            ||
| 741 | * @return Invoice  | 
            ||
| 742 | */  | 
            ||
| 743 | public function withCreatedAt(\DateTime $createdAt)  | 
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| 750 | |||
| 751 | /**  | 
            ||
| 752 | * @return \DateTime  | 
            ||
| 753 | */  | 
            ||
| 754 | public function getAttestedAt(): \DateTime  | 
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| 758 | |||
| 759 | /**  | 
            ||
| 760 | * @param \DateTime $attestedAt  | 
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| 761 | *  | 
            ||
| 762 | * @return Invoice  | 
            ||
| 763 | */  | 
            ||
| 764 | public function withAttestedAt(\DateTime $attestedAt)  | 
            ||
| 771 | |||
| 772 | /**  | 
            ||
| 773 | * @return \DateTime  | 
            ||
| 774 | */  | 
            ||
| 775 | public function getUpdateAt(): \DateTime  | 
            ||
| 779 | |||
| 780 | /**  | 
            ||
| 781 | * @param \DateTime $updateAt  | 
            ||
| 782 | *  | 
            ||
| 783 | * @return Invoice  | 
            ||
| 784 | */  | 
            ||
| 785 | public function withUpdateAt(\DateTime $updateAt)  | 
            ||
| 792 | |||
| 793 | /**  | 
            ||
| 794 | * @return BillogramCallback  | 
            ||
| 795 | */  | 
            ||
| 796 | public function getCallbacks(): BillogramCallback  | 
            ||
| 800 | |||
| 801 | /**  | 
            ||
| 802 | * @param BillogramCallback $callbacks  | 
            ||
| 803 | *  | 
            ||
| 804 | * @return Invoice  | 
            ||
| 805 | */  | 
            ||
| 806 | public function withCallbacks(BillogramCallback $callbacks)  | 
            ||
| 813 | |||
| 814 | /**  | 
            ||
| 815 | * @return DetailedSums  | 
            ||
| 816 | */  | 
            ||
| 817 | public function getDetailedSums(): DetailedSums  | 
            ||
| 821 | |||
| 822 | /**  | 
            ||
| 823 | * @param DetailedSums $detailedSums  | 
            ||
| 824 | *  | 
            ||
| 825 | * @return Invoice  | 
            ||
| 826 | */  | 
            ||
| 827 | public function withDetailedSums(DetailedSums $detailedSums)  | 
            ||
| 834 | |||
| 835 | /**  | 
            ||
| 836 | * @return string  | 
            ||
| 837 | */  | 
            ||
| 838 | public function getAttachment(): string  | 
            ||
| 842 | |||
| 843 | /**  | 
            ||
| 844 | * @param string $attachment  | 
            ||
| 845 | *  | 
            ||
| 846 | * @return Invoice  | 
            ||
| 847 | */  | 
            ||
| 848 | public function withAttachment(string $attachment)  | 
            ||
| 855 | |||
| 856 | /**  | 
            ||
| 857 | * @return ReminderCollection  | 
            ||
| 858 | */  | 
            ||
| 859 | public function getAutomaticCollection(): ReminderCollection  | 
            ||
| 863 | |||
| 864 | /**  | 
            ||
| 865 | * @param ReminderCollection $automaticCollection  | 
            ||
| 866 | *  | 
            ||
| 867 | * @return Invoice  | 
            ||
| 868 | */  | 
            ||
| 869 | public function withAutomaticCollection(ReminderCollection $automaticCollection)  | 
            ||
| 876 | |||
| 877 | /**  | 
            ||
| 878 | * @return int  | 
            ||
| 879 | */  | 
            ||
| 880 | public function getRoundingValue(): int  | 
            ||
| 884 | |||
| 885 | 2 | public function toArray()  | 
            |
| 903 | |||
| 904 | /**  | 
            ||
| 905 | * Create an API response object from the HTTP response from the API server.  | 
            ||
| 906 | *  | 
            ||
| 907 | * @param array $data  | 
            ||
| 908 | *  | 
            ||
| 909 | * @return self  | 
            ||
| 910 | */  | 
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| 911 | 4 | public static function createFromArray(array $data)  | 
            |
| 975 | }  | 
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| 976 |