Complex classes like Checksig 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 Checksig, and based on these observations, apply Extract Interface, too.
| 1 | <?php | ||
| 16 | class Checksig | ||
| 17 | { | ||
| 18 | /** | ||
| 19 | * @var string | ||
| 20 | */ | ||
| 21 | private $scriptType; | ||
| 22 | |||
| 23 | /** | ||
| 24 | * @var bool | ||
| 25 | */ | ||
| 26 | private $required = true; | ||
| 27 | |||
| 28 | /** | ||
| 29 | * @var PayToPubkeyHash|PayToPubkey|Multisig | ||
| 30 | */ | ||
| 31 | private $info; | ||
| 32 | |||
| 33 | /** | ||
| 34 | * @var int | ||
| 35 | */ | ||
| 36 | protected $requiredSigs; | ||
| 37 | |||
| 38 | /** | ||
| 39 | * @var int | ||
| 40 | */ | ||
| 41 | protected $keyCount; | ||
| 42 | |||
| 43 | /** | ||
| 44 | * @var TransactionSignatureInterface[] | ||
| 45 | */ | ||
| 46 | protected $signatures = []; | ||
| 47 | |||
| 48 | /** | ||
| 49 | * @var PublicKeyInterface[]|null[] | ||
| 50 | */ | ||
| 51 | protected $publicKeys = []; | ||
| 52 | |||
| 53 | /** | ||
| 54 | * Checksig constructor. | ||
| 55 | * @param $info | ||
| 56 | */ | ||
| 57 | 136 | public function __construct($info, TransactionSignatureSerializer $txSigSerializer, PublicKeySerializerInterface $pubKeySerializer) | |
| 91 | |||
| 92 | public function receivesValue(Conditional $conditional) | ||
| 102 | |||
| 103 | 4 | public function setRequired($setting) | |
| 111 | |||
| 112 | 116 | public function isRequired() | |
| 116 | |||
| 117 | /** | ||
| 118 | * @return Multisig|PayToPubkey|PayToPubkeyHash | ||
| 119 | */ | ||
| 120 | 84 | public function getInfo() | |
| 124 | |||
| 125 | /** | ||
| 126 | * @return string | ||
| 127 | */ | ||
| 128 | 136 | public function getType() | |
| 132 | |||
| 133 | /** | ||
| 134 | * @return array|BufferInterface|BufferInterface[] | ||
| 135 | */ | ||
| 136 | 82 | public function getSolution() | |
| 146 | |||
| 147 | /** | ||
| 148 | * @return int | ||
| 149 | */ | ||
| 150 | 120 | public function getRequiredSigs() | |
| 154 | |||
| 155 | /** | ||
| 156 | * @return bool | ||
| 157 | */ | ||
| 158 | 122 | public function isFullySigned() | |
| 166 | |||
| 167 | /** | ||
| 168 | * @param int $idx | ||
| 169 | * @return bool | ||
| 170 | */ | ||
| 171 | 118 | public function hasSignature($idx) | |
| 179 | |||
| 180 | /** | ||
| 181 | * @param int $idx | ||
| 182 | * @param TransactionSignatureInterface $signature | ||
| 183 | * @return $this | ||
| 184 | */ | ||
| 185 | 116 | public function setSignature($idx, TransactionSignatureInterface $signature) | |
| 194 | |||
| 195 | /** | ||
| 196 | * @param int $idx | ||
| 197 | * @return TransactionSignatureInterface|null | ||
| 198 | */ | ||
| 199 | 116 | public function getSignature($idx) | |
| 207 | |||
| 208 | /** | ||
| 209 | * @return array | ||
| 210 | */ | ||
| 211 | 116 | public function getSignatures() | |
| 215 | |||
| 216 | /** | ||
| 217 | * @param int $idx | ||
| 218 | * @return bool | ||
| 219 | */ | ||
| 220 | 68 | public function hasKey($idx) | |
| 224 | |||
| 225 | /** | ||
| 226 | * @param int $idx | ||
| 227 | * @return PublicKeyInterface|null | ||
| 228 | */ | ||
| 229 | 68 | public function getKey($idx) | |
| 237 | |||
| 238 | /** | ||
| 239 | * @param $idx | ||
| 240 | * @param PublicKeyInterface|null $key | ||
| 241 | * @return $this | ||
| 242 | */ | ||
| 243 | 128 | public function setKey($idx, $key) | |
| 252 | |||
| 253 | /** | ||
| 254 | * @return PublicKeyInterface[] | ||
| 255 | */ | ||
| 256 | 118 | public function getKeys() | |
| 260 | |||
| 261 | 118 | public function isVerify() | |
| 265 | |||
| 266 | /** | ||
| 267 | * @return array | ||
| 268 | */ | ||
| 269 | 116 | public function serialize() | |
| 307 | } | ||
| 308 | 
In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: