Complex classes like DirectionRequest 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 DirectionRequest, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 21 | class DirectionRequest implements DirectionRequestInterface  | 
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| 22 | { | 
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| 23 | /**  | 
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| 24 | * @var LocationInterface  | 
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| 25 | */  | 
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| 26 | private $origin;  | 
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| 27 | |||
| 28 | /**  | 
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| 29 | * @var LocationInterface  | 
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| 30 | */  | 
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| 31 | private $destination;  | 
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| 32 | |||
| 33 | /**  | 
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| 34 | * @var \DateTime|null  | 
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| 35 | */  | 
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| 36 | private $departureTime;  | 
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| 37 | |||
| 38 | /**  | 
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| 39 | * @var \DateTime|null  | 
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| 40 | */  | 
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| 41 | private $arrivalTime;  | 
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| 42 | |||
| 43 | /**  | 
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| 44 | * @var DirectionWaypoint[]  | 
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| 45 | */  | 
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| 46 | private $waypoints = [];  | 
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| 47 | |||
| 48 | /**  | 
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| 49 | * @var bool|null  | 
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| 50 | */  | 
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| 51 | private $optimizeWaypoints;  | 
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| 52 | |||
| 53 | /**  | 
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| 54 | * @var string|null  | 
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| 55 | */  | 
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| 56 | private $travelMode;  | 
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| 57 | |||
| 58 | /**  | 
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| 59 | * @var string|null  | 
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| 60 | */  | 
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| 61 | private $avoid;  | 
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| 62 | |||
| 63 | /**  | 
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| 64 | * @var bool|null  | 
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| 65 | */  | 
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| 66 | private $provideRouteAlternatives;  | 
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| 67 | |||
| 68 | /**  | 
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| 69 | * @var string|null  | 
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| 70 | */  | 
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| 71 | private $trafficModel;  | 
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| 72 | |||
| 73 | /**  | 
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| 74 | * @var string[]  | 
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| 75 | */  | 
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| 76 | private $transitModes = [];  | 
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| 77 | |||
| 78 | /**  | 
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| 79 | * @var string|null  | 
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| 80 | */  | 
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| 81 | private $transitRoutingPreference;  | 
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| 82 | |||
| 83 | /**  | 
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| 84 | * @var string|null  | 
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| 85 | */  | 
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| 86 | private $region;  | 
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| 87 | |||
| 88 | /**  | 
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| 89 | * @var string|null  | 
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| 90 | */  | 
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| 91 | private $unitSystem;  | 
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| 92 | |||
| 93 | /**  | 
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| 94 | * @var string|null  | 
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| 95 | */  | 
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| 96 | private $language;  | 
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| 97 | |||
| 98 | /**  | 
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| 99 | * @param LocationInterface $origin  | 
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| 100 | * @param LocationInterface $destination  | 
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| 101 | */  | 
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| 102 | public function __construct(LocationInterface $origin, LocationInterface $destination)  | 
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| 107 | |||
| 108 | /**  | 
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| 109 | * @return LocationInterface  | 
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| 110 | */  | 
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| 111 | public function getOrigin()  | 
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| 115 | |||
| 116 | /**  | 
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| 117 | * @param LocationInterface $origin  | 
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| 118 | */  | 
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| 119 | public function setOrigin(LocationInterface $origin)  | 
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| 123 | |||
| 124 | /**  | 
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| 125 | * @return LocationInterface  | 
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| 126 | */  | 
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| 127 | public function getDestination()  | 
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| 131 | |||
| 132 | /**  | 
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| 133 | * @param LocationInterface $destination  | 
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| 134 | */  | 
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| 135 | public function setDestination(LocationInterface $destination)  | 
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| 139 | |||
| 140 | /**  | 
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| 141 | * @return bool  | 
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| 142 | */  | 
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| 143 | public function hasDepartureTime()  | 
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| 147 | |||
| 148 | /**  | 
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| 149 | * @return \DateTime|null  | 
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| 150 | */  | 
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| 151 | public function getDepartureTime()  | 
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| 155 | |||
| 156 | /**  | 
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| 157 | * @param \DateTime|null $departureTime  | 
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| 158 | */  | 
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| 159 | public function setDepartureTime(\DateTime $departureTime = null)  | 
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| 163 | |||
| 164 | /**  | 
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| 165 | * @return bool  | 
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| 166 | */  | 
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| 167 | public function hasArrivalTime()  | 
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| 171 | |||
| 172 | /**  | 
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| 173 | * @return \DateTime|null  | 
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| 174 | */  | 
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| 175 | public function getArrivalTime()  | 
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| 179 | |||
| 180 | /**  | 
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| 181 | * @param \DateTime|null $arrivalTime  | 
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| 182 | */  | 
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| 183 | public function setArrivalTime(\DateTime $arrivalTime = null)  | 
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| 187 | |||
| 188 | /**  | 
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| 189 | * @return bool  | 
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| 190 | */  | 
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| 191 | public function hasWaypoints()  | 
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| 195 | |||
| 196 | /**  | 
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| 197 | * @return DirectionWaypoint[]  | 
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| 198 | */  | 
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| 199 | public function getWaypoints()  | 
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| 203 | |||
| 204 | /**  | 
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| 205 | * @param DirectionWaypoint[] $waypoints  | 
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| 206 | */  | 
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| 207 | public function setWaypoints(array $waypoints)  | 
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| 212 | |||
| 213 | /**  | 
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| 214 | * @param DirectionWaypoint[] $waypoints  | 
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| 215 | */  | 
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| 216 | public function addWaypoints(array $waypoints)  | 
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| 222 | |||
| 223 | /**  | 
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| 224 | * @param DirectionWaypoint $waypoint  | 
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| 225 | *  | 
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| 226 | * @return bool  | 
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| 227 | */  | 
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| 228 | public function hasWaypoint(DirectionWaypoint $waypoint)  | 
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| 232 | |||
| 233 | /**  | 
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| 234 | * @param DirectionWaypoint $waypoint  | 
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| 235 | */  | 
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| 236 | public function addWaypoint(DirectionWaypoint $waypoint)  | 
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| 242 | |||
| 243 | /**  | 
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| 244 | * @param DirectionWaypoint $waypoint  | 
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| 245 | */  | 
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| 246 | public function removeWaypoint(DirectionWaypoint $waypoint)  | 
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| 250 | |||
| 251 | /**  | 
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| 252 | * @return bool  | 
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| 253 | */  | 
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| 254 | public function hasOptimizeWaypoints()  | 
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| 258 | |||
| 259 | /**  | 
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| 260 | * @return bool|null  | 
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| 261 | */  | 
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| 262 | public function getOptimizeWaypoints()  | 
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| 266 | |||
| 267 | /**  | 
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| 268 | * @param bool|null $optimizeWaypoints  | 
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| 269 | */  | 
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| 270 | public function setOptimizeWaypoints($optimizeWaypoints = null)  | 
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| 274 | |||
| 275 | /**  | 
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| 276 | * @return bool  | 
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| 277 | */  | 
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| 278 | public function hasTravelMode()  | 
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| 282 | |||
| 283 | /**  | 
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| 284 | * @return string|null  | 
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| 285 | */  | 
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| 286 | public function getTravelMode()  | 
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| 290 | |||
| 291 | /**  | 
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| 292 | * @param string|null $travelMode  | 
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| 293 | */  | 
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| 294 | public function setTravelMode($travelMode = null)  | 
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| 298 | |||
| 299 | /**  | 
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| 300 | * @return bool  | 
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| 301 | */  | 
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| 302 | public function hasAvoid()  | 
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| 306 | |||
| 307 | /**  | 
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| 308 | * @return string|null  | 
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| 309 | */  | 
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| 310 | public function getAvoid()  | 
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| 314 | |||
| 315 | /**  | 
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| 316 | * @param string|null $avoid  | 
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| 317 | */  | 
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| 318 | public function setAvoid($avoid = null)  | 
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| 322 | |||
| 323 | /**  | 
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| 324 | * @return bool  | 
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| 325 | */  | 
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| 326 | public function hasProvideRouteAlternatives()  | 
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| 330 | |||
| 331 | /**  | 
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| 332 | * @return bool|null  | 
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| 333 | */  | 
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| 334 | public function getProvideRouteAlternatives()  | 
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| 338 | |||
| 339 | /**  | 
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| 340 | * @param bool|null $provideRouteAlternatives  | 
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| 341 | */  | 
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| 342 | public function setProvideRouteAlternatives($provideRouteAlternatives = null)  | 
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| 346 | |||
| 347 | /**  | 
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| 348 | * @return bool  | 
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| 349 | */  | 
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| 350 | public function hasTrafficModel()  | 
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| 354 | |||
| 355 | /**  | 
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| 356 | * @return string|null  | 
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| 357 | */  | 
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| 358 | public function getTrafficModel()  | 
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| 362 | |||
| 363 | /**  | 
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| 364 | * @param string|null $trafficModel  | 
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| 365 | */  | 
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| 366 | public function setTrafficModel($trafficModel)  | 
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| 370 | |||
| 371 | /**  | 
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| 372 | * @return bool  | 
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| 373 | */  | 
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| 374 | public function hasTransitModes()  | 
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| 378 | |||
| 379 | /**  | 
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| 380 | * @return string[]  | 
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| 381 | */  | 
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| 382 | public function getTransitModes()  | 
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| 386 | |||
| 387 | /**  | 
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| 388 | * @param string[] $transitModes  | 
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| 389 | */  | 
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| 390 | public function setTransitModes(array $transitModes)  | 
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| 395 | |||
| 396 | /**  | 
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| 397 | * @param string[] $transitModes  | 
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| 398 | */  | 
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| 399 | public function addTransitModes(array $transitModes)  | 
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| 405 | |||
| 406 | /**  | 
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| 407 | * @param string $transitMode  | 
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| 408 | *  | 
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| 409 | * @return bool  | 
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| 410 | */  | 
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| 411 | public function hasTransitMode($transitMode)  | 
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| 415 | |||
| 416 | /**  | 
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| 417 | * @param string $transitMode  | 
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| 418 | */  | 
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| 419 | public function addTransitMode($transitMode)  | 
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| 425 | |||
| 426 | /**  | 
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| 427 | * @param string $transitMode  | 
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| 428 | */  | 
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| 429 | public function removeTransitMode($transitMode)  | 
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| 434 | |||
| 435 | /**  | 
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| 436 | * @return bool  | 
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| 437 | */  | 
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| 438 | public function hasTransitRoutingPreference()  | 
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| 442 | |||
| 443 | /**  | 
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| 444 | * @return string|null  | 
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| 445 | */  | 
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| 446 | public function getTransitRoutingPreference()  | 
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| 450 | |||
| 451 | /**  | 
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| 452 | * @param string|null $transitRoutingPreference  | 
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| 453 | */  | 
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| 454 | public function setTransitRoutingPreference($transitRoutingPreference)  | 
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| 458 | |||
| 459 | /**  | 
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| 460 | * @return bool  | 
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| 461 | */  | 
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| 462 | public function hasRegion()  | 
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| 466 | |||
| 467 | /**  | 
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| 468 | * @return string|null  | 
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| 469 | */  | 
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| 470 | public function getRegion()  | 
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| 474 | |||
| 475 | /**  | 
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| 476 | * @param string|null $region  | 
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| 477 | */  | 
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| 478 | public function setRegion($region = null)  | 
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| 482 | |||
| 483 | /**  | 
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| 484 | * @return bool  | 
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| 485 | */  | 
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| 486 | public function hasUnitSystem()  | 
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| 490 | |||
| 491 | /**  | 
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| 492 | * @return string|null  | 
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| 493 | */  | 
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| 494 | public function getUnitSystem()  | 
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| 498 | |||
| 499 | /**  | 
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| 500 | * @param string|null $unitSystem  | 
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| 501 | */  | 
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| 502 | public function setUnitSystem($unitSystem = null)  | 
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| 506 | |||
| 507 | /**  | 
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| 508 | * @return bool  | 
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| 509 | */  | 
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| 510 | public function hasLanguage()  | 
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| 514 | |||
| 515 | /**  | 
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| 516 | * @return string|null  | 
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| 517 | */  | 
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| 518 | public function getLanguage()  | 
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| 522 | |||
| 523 | /**  | 
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| 524 | * @param string|null $language  | 
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| 525 | */  | 
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| 526 | public function setLanguage($language = null)  | 
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| 530 | |||
| 531 | /**  | 
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| 532 |      * {@inheritdoc} | 
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| 533 | */  | 
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| 534 | public function build()  | 
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| 601 | }  | 
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| 602 |