Complex classes like IndexDocument 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 IndexDocument, and based on these observations, apply Extract Interface, too.
| 1 | <?php  | 
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| 29 | class IndexDocument implements \JsonSerializable { | 
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| 30 | |||
| 31 | const NOT_ENCODED = 0;  | 
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| 32 | const ENCODED_BASE64 = 1;  | 
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| 33 | |||
| 34 | /** @var string|int */  | 
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| 35 | public $id;  | 
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| 36 | |||
| 37 | /** @var string */  | 
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| 38 | public $providerId;  | 
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| 39 | |||
| 40 | /** @var DocumentAccess */  | 
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| 41 | public $access;  | 
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| 42 | |||
| 43 | /** @var Index */  | 
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| 44 | public $index;  | 
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| 45 | |||
| 46 | /** @var int */  | 
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| 47 | public $modifiedTime = 0;  | 
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| 48 | |||
| 49 | /** @var array */  | 
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| 50 | public $tags = [];  | 
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| 51 | |||
| 52 | // TODO: do we really need it in the base class ?  | 
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| 53 | /** @var string */  | 
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| 54 | public $source = '';  | 
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| 55 | |||
| 56 | /** @var string */  | 
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| 57 | public $title = '';  | 
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| 58 | |||
| 59 | /** @var string */  | 
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| 60 | public $content = null;  | 
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| 61 | |||
| 62 | /** @var array */  | 
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| 63 | public $parts = [];  | 
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| 64 | |||
| 65 | /** @var string */  | 
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| 66 | public $link = '';  | 
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| 67 | |||
| 68 | /** @var array */  | 
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| 69 | public $more = [];  | 
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| 70 | |||
| 71 | /** @var array */  | 
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| 72 | public $excerpts = [];  | 
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| 73 | |||
| 74 | /** @var string */  | 
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| 75 | public $score;  | 
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| 76 | |||
| 77 | /** @var array */  | 
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| 78 | public $info = [];  | 
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| 79 | |||
| 80 | /** @var int */  | 
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| 81 | public $contentEncoded;  | 
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| 82 | |||
| 83 | |||
| 84 | 	public function __construct($providerId, $id) { | 
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| 88 | |||
| 89 | |||
| 90 | /**  | 
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| 91 | * @param string|integer $id  | 
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| 92 | *  | 
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| 93 | * @return $this  | 
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| 94 | */  | 
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| 95 | 	public function setId($id) { | 
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| 100 | |||
| 101 | /**  | 
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| 102 | * @return string|integer  | 
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| 103 | */  | 
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| 104 | 	public function getId() { | 
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| 107 | |||
| 108 | |||
| 109 | /**  | 
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| 110 | * @param string $providerId  | 
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| 111 | *  | 
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| 112 | * @return $this  | 
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| 113 | */  | 
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| 114 | 	public function setProviderId($providerId) { | 
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| 119 | |||
| 120 | /**  | 
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| 121 | * @return string  | 
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| 122 | */  | 
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| 123 | 	public function getProviderId() { | 
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| 126 | |||
| 127 | |||
| 128 | /**  | 
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| 129 | * @param Index $index  | 
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| 130 | */  | 
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| 131 | 	public function setIndex(Index $index) { | 
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| 134 | |||
| 135 | /**  | 
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| 136 | * @return Index  | 
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| 137 | */  | 
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| 138 | 	public function getIndex() { | 
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| 141 | |||
| 142 | |||
| 143 | /**  | 
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| 144 | * @param int $modifiedTime  | 
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| 145 | *  | 
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| 146 | * @return $this  | 
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| 147 | */  | 
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| 148 | 	public function setModifiedTime($modifiedTime) { | 
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| 153 | |||
| 154 | /**  | 
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| 155 | * @return int  | 
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| 156 | */  | 
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| 157 | 	public function getModifiedTime() { | 
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| 160 | |||
| 161 | /**  | 
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| 162 | * @param int $time  | 
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| 163 | *  | 
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| 164 | * @return bool  | 
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| 165 | */  | 
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| 166 | 	public function isOlderThan($time) { | 
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| 169 | |||
| 170 | |||
| 171 | /**  | 
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| 172 | * @param DocumentAccess $access  | 
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| 173 | *  | 
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| 174 | * @return $this  | 
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| 175 | */  | 
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| 176 | 	public function setAccess(DocumentAccess $access) { | 
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| 181 | |||
| 182 | /**  | 
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| 183 | * @return DocumentAccess  | 
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| 184 | */  | 
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| 185 | 	public function getAccess() { | 
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| 188 | |||
| 189 | |||
| 190 | /**  | 
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| 191 | * @param array $tags  | 
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| 192 | *  | 
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| 193 | * @return $this  | 
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| 194 | */  | 
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| 195 | 	public function setTags($tags) { | 
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| 200 | |||
| 201 | /**  | 
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| 202 | * @return array  | 
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| 203 | */  | 
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| 204 | 	public function getTags() { | 
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| 207 | |||
| 208 | /**  | 
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| 209 | * @param $tag  | 
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| 210 | *  | 
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| 211 | * @return $this  | 
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| 212 | */  | 
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| 213 | 	public function addTag($tag) { | 
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| 218 | |||
| 219 | /**  | 
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| 220 | * @return string  | 
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| 221 | */  | 
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| 222 | 	public function getSource() { | 
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| 225 | |||
| 226 | /**  | 
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| 227 | * @param string $source  | 
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| 228 | *  | 
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| 229 | * @return $this  | 
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| 230 | */  | 
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| 231 | 	public function setSource($source) { | 
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| 236 | |||
| 237 | |||
| 238 | /**  | 
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| 239 | * @param string $title  | 
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| 240 | *  | 
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| 241 | * @return $this  | 
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| 242 | */  | 
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| 243 | 	public function setTitle($title) { | 
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| 248 | |||
| 249 | /**  | 
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| 250 | * @return string  | 
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| 251 | */  | 
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| 252 | 	public function getTitle() { | 
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| 255 | |||
| 256 | |||
| 257 | /**  | 
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| 258 | * @param string $content  | 
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| 259 | * @param int $encoded  | 
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| 260 | *  | 
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| 261 | * @return $this  | 
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| 262 | */  | 
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| 263 | 	public function setContent($content, $encoded = 0) { | 
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| 269 | |||
| 270 | /**  | 
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| 271 | * @return string  | 
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| 272 | */  | 
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| 273 | 	public function getContent() { | 
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| 276 | |||
| 277 | |||
| 278 | /**  | 
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| 279 | * @param string $part  | 
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| 280 | * @param string $content  | 
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| 281 | *  | 
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| 282 | * @return $this  | 
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| 283 | */  | 
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| 284 | 	public function setPart($part, $content) { | 
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| 289 | |||
| 290 | /**  | 
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| 291 | * @param array $parts  | 
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| 292 | *  | 
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| 293 | * @return $this  | 
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| 294 | */  | 
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| 295 | 	public function setParts($parts) { | 
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| 300 | |||
| 301 | /**  | 
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| 302 | * @return array  | 
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| 303 | */  | 
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| 304 | 	public function getParts() { | 
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| 307 | |||
| 308 | |||
| 309 | /**  | 
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| 310 | * @return int  | 
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| 311 | */  | 
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| 312 | 	public function isContentEncoded() { | 
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| 315 | |||
| 316 | |||
| 317 | /**  | 
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| 318 | * @param string $link  | 
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| 319 | *  | 
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| 320 | * @return $this  | 
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| 321 | */  | 
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| 322 | 	public function setLink($link) { | 
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| 327 | |||
| 328 | /**  | 
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| 329 | * @return string  | 
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| 330 | */  | 
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| 331 | 	public function getLink() { | 
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| 334 | |||
| 335 | |||
| 336 | /**  | 
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| 337 | * @param array $more  | 
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| 338 | *  | 
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| 339 | * @return $this  | 
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| 340 | */  | 
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| 341 | 	public function setMore($more) { | 
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| 346 | |||
| 347 | /**  | 
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| 348 | * @return array  | 
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| 349 | */  | 
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| 350 | 	public function getMore() { | 
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| 353 | |||
| 354 | |||
| 355 | /**  | 
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| 356 | * @param array $excerpts  | 
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| 357 | *  | 
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| 358 | * @return $this  | 
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| 359 | */  | 
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| 360 | 	public function setExcerpts($excerpts) { | 
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| 367 | |||
| 368 | /**  | 
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| 369 | * @return array  | 
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| 370 | */  | 
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| 371 | 	public function getExcerpts() { | 
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| 374 | |||
| 375 | /**  | 
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| 376 | * @param string $excerpt  | 
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| 377 | */  | 
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| 378 | 	public function addExcerpt($excerpt) { | 
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| 383 | |||
| 384 | /**  | 
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| 385 | * @param $excerpt  | 
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| 386 | *  | 
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| 387 | * @return mixed  | 
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| 388 | */  | 
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| 389 | 	public function cleanExcerpt($excerpt) { | 
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| 399 | |||
| 400 | /**  | 
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| 401 | * @param string $score  | 
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| 402 | *  | 
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| 403 | * @return $this  | 
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| 404 | */  | 
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| 405 | 	public function setScore($score) { | 
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| 410 | |||
| 411 | /**  | 
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| 412 | * @return string  | 
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| 413 | */  | 
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| 414 | 	public function getScore() { | 
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| 417 | |||
| 418 | |||
| 419 | /**  | 
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| 420 | * @param string $info  | 
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| 421 | * @param mixed $value  | 
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| 422 | *  | 
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| 423 | * @return $this  | 
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| 424 | */  | 
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| 425 | 	public function setInfo($info, $value) { | 
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| 430 | |||
| 431 | /**  | 
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| 432 | * @param string $info  | 
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| 433 | * @param mixed $default  | 
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| 434 | *  | 
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| 435 | * @return mixed  | 
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| 436 | */  | 
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| 437 | 	public function getInfo($info, $default = '') { | 
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| 444 | |||
| 445 | |||
| 446 | /**  | 
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| 447 | * @return array  | 
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| 448 | */  | 
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| 449 | 	public function getInfoAll() { | 
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| 462 | |||
| 463 | |||
| 464 | 	public function __destruct() { | 
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| 480 | |||
| 481 | /**  | 
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| 482 | * @return array<string,string|integer|DocumentAccess|array>  | 
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| 483 | */  | 
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| 484 | 	public function jsonSerialize() { | 
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| 499 | |||
| 500 | }  |