Complex classes like Search 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 Search, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 28 | class Search |
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| 29 | { |
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| 30 | /** |
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| 31 | * @var int |
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| 32 | */ |
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| 33 | private $size; |
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| 34 | |||
| 35 | /** |
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| 36 | * @var int |
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| 37 | */ |
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| 38 | private $from; |
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| 39 | |||
| 40 | /** |
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| 41 | * @var string|null |
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| 42 | */ |
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| 43 | private $scroll; |
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| 44 | |||
| 45 | /** |
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| 46 | * @var array|bool|string |
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| 47 | */ |
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| 48 | private $source; |
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| 49 | |||
| 50 | /** |
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| 51 | * @var array |
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| 52 | */ |
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| 53 | private $fields; |
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| 54 | |||
| 55 | /** |
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| 56 | * @var array |
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| 57 | */ |
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| 58 | private $scriptFields; |
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| 59 | |||
| 60 | /** |
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| 61 | * @var string |
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| 62 | */ |
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| 63 | private $timeout; |
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| 64 | |||
| 65 | /** |
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| 66 | * @var string |
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| 67 | */ |
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| 68 | private $searchType; |
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| 69 | |||
| 70 | /** |
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| 71 | * @var bool |
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| 72 | */ |
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| 73 | private $explain; |
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| 74 | |||
| 75 | /** |
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| 76 | * @var array |
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| 77 | */ |
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| 78 | private $stats; |
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| 79 | |||
| 80 | /** |
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| 81 | * @var string[] |
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| 82 | */ |
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| 83 | private $preference; |
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| 84 | |||
| 85 | /** |
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| 86 | * @var float |
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| 87 | */ |
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| 88 | private $minScore; |
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| 89 | |||
| 90 | /** |
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| 91 | * @var OrderedSerializer |
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| 92 | */ |
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| 93 | private $serializer; |
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| 94 | |||
| 95 | /** |
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| 96 | * @var SearchEndpointInterface[] |
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| 97 | */ |
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| 98 | private $endpoints = []; |
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| 99 | |||
| 100 | /** |
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| 101 | * Initializes serializer. |
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| 102 | */ |
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| 103 | public function __construct() |
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| 104 | { |
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| 105 | $this->serializer = new OrderedSerializer( |
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| 106 | [ |
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| 107 | new CustomReferencedNormalizer(), |
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| 108 | new CustomNormalizer(), |
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| 109 | ] |
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| 110 | ); |
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| 111 | } |
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| 112 | |||
| 113 | /** |
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| 114 | * Adds query to search. |
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| 115 | * |
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| 116 | * @param BuilderInterface $query |
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| 117 | * @param string $boolType |
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| 118 | * |
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| 119 | * @return Search |
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| 120 | */ |
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| 121 | public function addQuery(BuilderInterface $query, $boolType = '') |
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| 122 | { |
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| 123 | $this |
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| 124 | ->getEndpoint('query') |
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| 125 | ->addBuilder($query, ['bool_type' => $boolType]); |
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| 126 | |||
| 127 | return $this; |
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| 128 | } |
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| 129 | |||
| 130 | /** |
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| 131 | * Sets parameters for bool query. |
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| 132 | * |
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| 133 | * @param array $params Example values: |
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| 134 | * - minimum_should_match => 1 |
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| 135 | * - boost => 1. |
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| 136 | * |
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| 137 | * @return Search |
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| 138 | */ |
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| 139 | public function setBoolQueryParameters(array $params) |
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| 140 | { |
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| 141 | $this |
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| 142 | ->getEndpoint('query') |
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| 143 | ->setParameters($params); |
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| 144 | |||
| 145 | return $this; |
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| 146 | } |
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| 147 | |||
| 148 | /** |
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| 149 | * Returns contained query. |
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| 150 | * |
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| 151 | * @return BuilderInterface |
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| 152 | */ |
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| 153 | public function getQuery() |
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| 154 | { |
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| 155 | return $this |
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| 156 | ->getEndpoint('query') |
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| 157 | ->getBuilder(); |
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| 158 | } |
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| 159 | |||
| 160 | /** |
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| 161 | * Destroys query part. |
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| 162 | * |
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| 163 | * @return Search |
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| 164 | */ |
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| 165 | public function destroyQuery() |
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| 166 | { |
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| 167 | $this->destroyEndpoint('query'); |
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| 168 | |||
| 169 | return $this; |
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| 170 | } |
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| 171 | |||
| 172 | /** |
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| 173 | * Adds a filter to search. |
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| 174 | * |
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| 175 | * @param BuilderInterface $filter Filter. |
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| 176 | * @param string $boolType Possible boolType values: |
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| 177 | * - must |
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| 178 | * - must_not |
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| 179 | * - should. |
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| 180 | * |
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| 181 | * @return Search |
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| 182 | */ |
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| 183 | public function addFilter(BuilderInterface $filter, $boolType = '') |
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| 184 | { |
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| 185 | $this->getEndpoint('query'); |
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| 186 | |||
| 187 | $this |
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| 188 | ->getEndpoint('filter') |
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| 189 | ->addBuilder($filter, ['bool_type' => $boolType]); |
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| 190 | |||
| 191 | return $this; |
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| 192 | } |
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| 193 | |||
| 194 | /** |
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| 195 | * Returns currently contained filters. |
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| 196 | * |
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| 197 | * @return BuilderInterface |
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| 198 | */ |
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| 199 | public function getFilters() |
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| 200 | { |
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| 201 | return $this |
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| 202 | ->getEndpoint('filter') |
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| 203 | ->getBuilder(); |
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| 204 | } |
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| 205 | |||
| 206 | /** |
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| 207 | * Sets bool filter parameters. |
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| 208 | * |
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| 209 | * @param array $params Possible values: |
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| 210 | * _cache => true |
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| 211 | * false. |
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| 212 | * |
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| 213 | * @return Search |
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| 214 | */ |
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| 215 | public function setBoolFilterParameters($params) |
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| 216 | { |
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| 217 | $this |
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| 218 | ->getEndpoint('filter') |
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| 219 | ->setParameters($params); |
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| 220 | |||
| 221 | return $this; |
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| 222 | } |
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| 223 | |||
| 224 | /** |
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| 225 | * Destroys filter part. |
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| 226 | */ |
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| 227 | public function destroyFilters() |
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| 231 | |||
| 232 | /** |
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| 233 | * Adds a post filter to search. |
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| 234 | * |
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| 235 | * @param BuilderInterface $postFilter Post filter. |
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| 236 | * @param string $boolType Possible boolType values: |
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| 237 | * - must |
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| 238 | * - must_not |
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| 239 | * - should. |
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| 240 | * |
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| 241 | * @return Search |
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| 242 | */ |
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| 243 | public function addPostFilter(BuilderInterface $postFilter, $boolType = '') |
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| 244 | { |
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| 245 | $this |
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| 246 | ->getEndpoint('post_filter') |
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| 247 | ->addBuilder($postFilter, ['bool_type' => $boolType]); |
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| 248 | |||
| 249 | return $this; |
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| 250 | } |
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| 251 | |||
| 252 | /** |
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| 253 | * Returns all contained post filters. |
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| 254 | * |
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| 255 | * @return BuilderInterface |
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| 256 | */ |
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| 257 | public function getPostFilters() |
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| 258 | { |
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| 259 | return $this |
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| 260 | ->getEndpoint('post_filter') |
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| 261 | ->getBuilder(); |
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| 262 | } |
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| 263 | |||
| 264 | /** |
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| 265 | * Sets bool post filter parameters. |
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| 266 | * |
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| 267 | * @param array $params Possible values: |
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| 268 | * _cache => true |
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| 269 | * false. |
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| 270 | * |
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| 271 | * @return Search |
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| 272 | */ |
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| 273 | public function setBoolPostFilterParameters($params) |
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| 274 | { |
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| 275 | $this |
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| 276 | ->getEndpoint('post_filter') |
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| 277 | ->setParameters($params); |
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| 278 | |||
| 279 | return $this; |
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| 280 | } |
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| 281 | |||
| 282 | /** |
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| 283 | * Returns min score value. |
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| 284 | * |
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| 285 | * @return float |
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| 286 | */ |
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| 287 | public function getMinScore() |
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| 291 | |||
| 292 | /** |
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| 293 | * Exclude documents which have a _score less than the minimum specified. |
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| 294 | * |
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| 295 | * @param float $minScore |
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| 296 | * |
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| 297 | * @return Search |
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| 298 | */ |
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| 299 | public function setMinScore($minScore) |
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| 300 | { |
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| 301 | $this->minScore = $minScore; |
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| 302 | |||
| 303 | return $this; |
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| 304 | } |
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| 305 | |||
| 306 | /** |
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| 307 | * Paginate results from. |
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| 308 | * |
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| 309 | * @param int $from |
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| 310 | * |
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| 311 | * @return Search |
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| 312 | */ |
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| 313 | public function setFrom($from) |
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| 314 | { |
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| 315 | $this->from = $from; |
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| 316 | |||
| 317 | return $this; |
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| 318 | } |
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| 319 | |||
| 320 | /** |
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| 321 | * Returns results offset value. |
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| 322 | * |
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| 323 | * @return int |
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| 324 | */ |
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| 325 | public function getFrom() |
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| 329 | |||
| 330 | /** |
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| 331 | * Set maximum number of results. |
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| 332 | * |
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| 333 | * @param int $size |
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| 334 | * |
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| 335 | * @return Search |
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| 336 | */ |
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| 337 | public function setSize($size) |
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| 338 | { |
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| 339 | $this->size = $size; |
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| 340 | |||
| 341 | return $this; |
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| 342 | } |
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| 343 | |||
| 344 | /** |
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| 345 | * Returns maximum number of results query can request. |
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| 346 | * |
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| 347 | * @return int |
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| 348 | */ |
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| 349 | public function getSize() |
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| 353 | |||
| 354 | /** |
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| 355 | * Adds sort to search. |
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| 356 | * |
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| 357 | * @param AbstractSort $sort |
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| 358 | * |
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| 359 | * @return Search |
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| 360 | */ |
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| 361 | public function addSort(AbstractSort $sort) |
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| 362 | { |
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| 363 | $this |
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| 364 | ->getEndpoint('sort') |
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| 365 | ->addBuilder($sort); |
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| 366 | |||
| 367 | return $this; |
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| 368 | } |
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| 369 | |||
| 370 | /** |
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| 371 | * Returns sorts object. |
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| 372 | * |
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| 373 | * @return Sorts |
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| 374 | */ |
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| 375 | public function getSorts() |
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| 376 | { |
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| 377 | return $this |
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| 378 | ->getEndpoint('sort') |
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| 379 | ->getBuilder(); |
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| 380 | } |
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| 381 | |||
| 382 | /** |
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| 383 | * Allows to control how the _source field is returned with every hit. |
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| 384 | * |
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| 385 | * @param array|bool|string $source |
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| 386 | * |
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| 387 | * @return Search |
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| 388 | */ |
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| 389 | public function setSource($source) |
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| 390 | { |
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| 391 | $this->source = $source; |
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| 392 | |||
| 393 | return $this; |
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| 394 | } |
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| 395 | |||
| 396 | /** |
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| 397 | * Returns source value. |
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| 398 | * |
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| 399 | * @return array|bool|string |
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| 400 | */ |
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| 401 | public function getSource() |
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| 405 | |||
| 406 | /** |
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| 407 | * Allows to selectively load specific stored fields for each document represented by a search hit. |
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| 408 | * |
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| 409 | * @param array $fields |
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| 410 | * |
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| 411 | * @return Search |
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| 412 | */ |
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| 413 | public function setFields(array $fields) |
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| 414 | { |
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| 415 | $this->fields = $fields; |
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| 416 | |||
| 417 | return $this; |
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| 418 | } |
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| 419 | |||
| 420 | /** |
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| 421 | * Returns field value. |
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| 422 | * |
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| 423 | * @return array |
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| 424 | */ |
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| 425 | public function getFields() |
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| 429 | |||
| 430 | /** |
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| 431 | * Allows to return a script evaluation (based on different fields) for each hit. |
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| 432 | * |
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| 433 | * @param array $scriptFields |
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| 434 | * |
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| 435 | * @return Search |
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| 436 | */ |
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| 437 | public function setScriptFields($scriptFields) |
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| 438 | { |
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| 439 | $this->scriptFields = $scriptFields; |
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| 440 | |||
| 441 | return $this; |
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| 442 | } |
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| 443 | |||
| 444 | /** |
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| 445 | * Returns containing script fields. |
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| 446 | * |
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| 447 | * @return array |
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| 448 | */ |
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| 449 | public function getScriptFields() |
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| 453 | |||
| 454 | /** |
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| 455 | * Allows to highlight search results on one or more fields. |
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| 456 | * |
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| 457 | * @param Highlight $highlight |
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| 458 | * |
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| 459 | * @return Search |
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| 460 | */ |
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| 461 | public function setHighlight($highlight) |
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| 462 | { |
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| 463 | $this |
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| 464 | ->getEndpoint('highlight') |
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| 465 | ->addBuilder($highlight); |
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| 466 | |||
| 467 | return $this; |
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| 468 | } |
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| 469 | |||
| 470 | /** |
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| 471 | * Returns containing highlight object. |
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| 472 | * |
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| 473 | * @return Highlight |
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| 474 | */ |
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| 475 | public function getHighlight() |
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| 476 | { |
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| 477 | return $this |
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| 478 | ->getEndpoint('highlight') |
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| 479 | ->getBuilder(); |
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| 480 | } |
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| 481 | |||
| 482 | /** |
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| 483 | * Sets explain property in request body search. |
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| 484 | * |
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| 485 | * @param bool $explain |
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| 486 | * |
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| 487 | * @return Search |
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| 488 | */ |
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| 489 | public function setExplain($explain) |
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| 490 | { |
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| 491 | $this->explain = $explain; |
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| 492 | |||
| 493 | return $this; |
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| 494 | } |
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| 495 | |||
| 496 | /** |
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| 497 | * Returns if explain property is set in request body search. |
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| 498 | * |
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| 499 | * @return bool |
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| 500 | */ |
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| 501 | public function isExplain() |
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| 505 | |||
| 506 | /** |
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| 507 | * Sets a stats group. |
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| 508 | * |
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| 509 | * @param array $stats |
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| 510 | * |
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| 511 | * @return Search |
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| 512 | */ |
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| 513 | public function setStats($stats) |
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| 514 | { |
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| 515 | $this->stats = $stats; |
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| 516 | |||
| 517 | return $this; |
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| 518 | } |
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| 519 | |||
| 520 | /** |
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| 521 | * Returns a stats group. |
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| 522 | * |
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| 523 | * @return array |
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| 524 | */ |
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| 525 | public function getStats() |
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| 529 | |||
| 530 | /** |
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| 531 | * Adds aggregation into search. |
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| 532 | * |
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| 533 | * @param AbstractAggregation $aggregation |
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| 534 | * |
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| 535 | * @return Search |
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| 536 | */ |
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| 537 | public function addAggregation(AbstractAggregation $aggregation) |
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| 538 | { |
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| 539 | $this |
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| 540 | ->getEndpoint('aggregations') |
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| 541 | ->addBuilder($aggregation); |
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| 542 | |||
| 543 | return $this; |
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| 544 | } |
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| 545 | |||
| 546 | /** |
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| 547 | * Returns contained aggregations. |
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| 548 | * |
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| 549 | * @return AbstractAggregation[] |
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| 550 | */ |
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| 551 | public function getAggregations() |
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| 552 | { |
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| 553 | return $this |
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| 554 | ->getEndpoint('aggregations') |
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| 555 | ->getBuilder(); |
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| 556 | } |
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| 557 | |||
| 558 | /** |
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| 559 | * Adds suggester to search. |
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| 560 | * |
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| 561 | * @param AbstractSuggester $suggester |
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| 562 | * |
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| 563 | * @return Search |
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| 564 | */ |
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| 565 | public function addSuggester(AbstractSuggester $suggester) |
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| 566 | { |
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| 567 | $this |
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| 568 | ->getEndpoint('suggest') |
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| 569 | ->addBuilder($suggester); |
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| 570 | |||
| 571 | return $this; |
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| 572 | } |
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| 573 | |||
| 574 | /** |
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| 575 | * Returns all contained suggester's. |
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| 576 | * |
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| 577 | * @return AbstractSuggester[] |
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| 578 | */ |
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| 579 | public function getSuggesters() |
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| 580 | { |
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| 581 | return $this |
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| 582 | ->getEndpoint('suggest') |
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| 583 | ->getBuilder(); |
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| 584 | } |
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| 585 | |||
| 586 | /** |
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| 587 | * Setter for scroll duration, effectively setting if search is scrolled or not. |
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| 588 | * |
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| 589 | * @param string|null $duration |
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| 590 | * |
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| 591 | * @return Search |
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| 592 | */ |
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| 593 | public function setScroll($duration = '5m') |
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| 594 | { |
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| 595 | $this->scroll = $duration; |
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| 596 | |||
| 597 | return $this; |
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| 598 | } |
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| 599 | |||
| 600 | /** |
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| 601 | * Returns scroll duration. |
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| 602 | * |
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| 603 | * @return string|null |
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| 604 | */ |
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| 605 | public function getScroll() |
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| 609 | |||
| 610 | /** |
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| 611 | * Set search type. |
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| 612 | * |
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| 613 | * @param string $searchType |
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| 614 | * |
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| 615 | * @return Search |
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| 616 | */ |
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| 617 | public function setSearchType($searchType) |
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| 618 | { |
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| 619 | $this->searchType = $searchType; |
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| 620 | |||
| 621 | return $this; |
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| 622 | } |
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| 623 | |||
| 624 | /** |
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| 625 | * Returns search type used. |
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| 626 | * |
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| 627 | * @return string |
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| 628 | */ |
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| 629 | public function getSearchType() |
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| 633 | |||
| 634 | /** |
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| 635 | * @return int |
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| 636 | */ |
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| 637 | public function getTimeout() |
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| 641 | |||
| 642 | /** |
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| 643 | * @param int $timeout |
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| 644 | */ |
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| 645 | public function setTimeout($timeout) |
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| 649 | |||
| 650 | /** |
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| 651 | * Setter for preference. |
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| 652 | * |
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| 653 | * Controls which shard replicas to execute the search request on. |
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| 654 | * |
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| 655 | * @param mixed $preferenceParams Possible values: |
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| 656 | * _primary |
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| 657 | * _primary_first |
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| 658 | * _local |
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| 659 | * _only_node:xyz (xyz - node id) |
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| 660 | * _prefer_node:xyz (xyz - node id) |
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| 661 | * _shards:2,3 (2 and 3 specified shards) |
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| 662 | * custom value |
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| 663 | * string[] combination of params. |
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| 664 | * |
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| 665 | * @return Search |
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| 666 | */ |
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| 667 | public function setPreference($preferenceParams) |
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| 679 | |||
| 680 | /** |
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| 681 | * Returns preference params as string. |
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| 682 | * |
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| 683 | * @return string |
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| 684 | */ |
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| 685 | public function getPreference() |
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| 689 | |||
| 690 | /** |
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| 691 | * Returns query url parameters. |
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| 692 | * |
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| 693 | * @return array |
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| 694 | */ |
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| 695 | public function getQueryParams() |
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| 696 | { |
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| 697 | return array_filter( |
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| 698 | [ |
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| 699 | 'scroll' => $this->getScroll(), |
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| 700 | 'timeout' => $this->getTimeout(), |
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| 701 | 'search_type' => $this->getSearchType(), |
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| 702 | 'preference' => $this->getPreference(), |
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| 703 | ] |
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| 704 | ); |
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| 705 | } |
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| 706 | |||
| 707 | /** |
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| 708 | * {@inheritdoc} |
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| 709 | */ |
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| 710 | public function toArray() |
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| 711 | { |
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| 712 | $output = array_filter($this->serializer->normalize($this->endpoints)); |
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| 713 | |||
| 714 | $params = [ |
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| 715 | 'from' => 'from', |
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| 716 | 'size' => 'size', |
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| 717 | 'fields' => 'fields', |
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| 718 | 'scriptFields' => 'script_fields', |
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| 719 | 'explain' => 'explain', |
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| 720 | 'stats' => 'stats', |
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| 721 | 'minScore' => 'min_score', |
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| 722 | 'source' => '_source', |
||
| 723 | ]; |
||
| 724 | |||
| 725 | foreach ($params as $field => $param) { |
||
| 726 | if ($this->$field !== null) { |
||
| 727 | $output[$param] = $this->$field; |
||
| 728 | } |
||
| 729 | } |
||
| 730 | |||
| 731 | return $output; |
||
| 732 | } |
||
| 733 | |||
| 734 | /** |
||
| 735 | * Returns endpoint instance. |
||
| 736 | * |
||
| 737 | * @param string $type Endpoint type. |
||
| 738 | * |
||
| 739 | * @return SearchEndpointInterface |
||
| 740 | */ |
||
| 741 | private function getEndpoint($type) |
||
| 742 | { |
||
| 743 | if (!array_key_exists($type, $this->endpoints)) { |
||
| 744 | $this->endpoints[$type] = SearchEndpointFactory::get($type); |
||
| 745 | } |
||
| 746 | |||
| 747 | return $this->endpoints[$type]; |
||
| 748 | } |
||
| 749 | |||
| 750 | /** |
||
| 751 | * Destroys search endpoint. |
||
| 752 | * |
||
| 753 | * @param string $type Endpoint type. |
||
| 754 | */ |
||
| 755 | private function destroyEndpoint($type) |
||
| 759 | } |
||
| 760 |
Let’s take a look at an example:
In the above example, the authenticate() method works fine as long as you just pass instances of MyUser. However, if you now also want to pass a different implementation of User which does not have a getDisplayName() method, the code will break.
Available Fixes
Change the type-hint for the parameter:
Add an additional type-check:
Add the method to the interface: