Complex classes like ChangeNotificationFilter 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 ChangeNotificationFilter, and based on these observations, apply Extract Interface, too.
1 | <?php |
||
21 | class ChangeNotificationFilter { |
||
22 | |||
23 | const VALUE_CHANGE = 'smw-value-change'; |
||
24 | const SPECIFICATION_CHANGE = 'smw-specification-change'; |
||
25 | |||
26 | /** |
||
27 | * @var DIWikiPage |
||
28 | */ |
||
29 | private $subject; |
||
30 | |||
31 | /** |
||
32 | * @var Store |
||
33 | */ |
||
34 | private $store; |
||
35 | |||
36 | /** |
||
37 | * @var DataValueFactory |
||
38 | */ |
||
39 | private $dataValueFactory; |
||
40 | |||
41 | /** |
||
42 | * @var array |
||
43 | */ |
||
44 | private $detectedProperties = array(); |
||
45 | |||
46 | /** |
||
47 | * In case detection matrix was stored as subobject on a property then match |
||
48 | * its pairs of property => subobjectKey so that later the Locator can find |
||
49 | * out which subobject contains the group that needs to be notified. |
||
50 | * |
||
51 | * @var array |
||
52 | */ |
||
53 | private $subSemanticDataMatch = array(); |
||
54 | |||
55 | /** |
||
56 | * @var string|null |
||
57 | */ |
||
58 | private $type = null; |
||
59 | |||
60 | /** |
||
61 | * @var User|null |
||
62 | */ |
||
63 | private $agent = null; |
||
64 | |||
65 | /** |
||
66 | * @var boolean |
||
67 | */ |
||
68 | private $canNotify = false; |
||
69 | |||
70 | /** |
||
71 | * @var array |
||
72 | */ |
||
73 | private $propertyExemptionList = array(); |
||
74 | |||
75 | /** |
||
76 | 8 | * @var boolean |
|
77 | 8 | */ |
|
78 | 8 | private $isCommandLineMode = false; |
|
79 | 8 | ||
80 | 8 | /** |
|
81 | * @since 1.0 |
||
82 | * |
||
83 | * @param DIWikiPage $subject |
||
84 | * @param Store $store |
||
85 | */ |
||
86 | public function __construct( DIWikiPage $subject, Store $store ) { |
||
91 | |||
92 | /** |
||
93 | * @since 1.0 |
||
94 | * |
||
95 | * @param User $agent |
||
96 | */ |
||
97 | public function setAgent( User $agent ) { |
||
100 | 2 | ||
101 | /** |
||
102 | 2 | * @since 1.0 |
|
103 | 1 | * |
|
104 | 1 | * @param array $propertyExemptionList |
|
105 | */ |
||
106 | public function setPropertyExemptionList( array $propertyExemptionList ) { |
||
111 | 1 | ||
112 | 1 | /** |
|
113 | 1 | * @since 1.0 |
|
114 | 1 | * |
|
115 | 1 | * @param boolean $isCommandLineMode |
|
116 | 1 | */ |
|
117 | 1 | public function isCommandLineMode( $isCommandLineMode ) { |
|
120 | |||
121 | /** |
||
122 | * @since 1.0 |
||
123 | * |
||
124 | * @param CompositePropertyTableDiffIterator $compositePropertyTableDiffIterator |
||
125 | * |
||
126 | * @return array |
||
127 | */ |
||
128 | 6 | public function findChangeEvent( CompositePropertyTableDiffIterator $compositePropertyTableDiffIterator ) { |
|
137 | |||
138 | 6 | /** |
|
139 | 5 | * @see EchoEvent::create |
|
140 | 6 | * |
|
141 | 1 | * @since 1.0 |
|
142 | 1 | * |
|
143 | * @param boolean|null $hasChangeToNotifyAbout |
||
144 | 6 | * |
|
145 | * @return array |
||
146 | */ |
||
147 | public function getEventRecord( $hasChangeToNotifyAbout = false ) { |
||
167 | |||
168 | 6 | /** |
|
169 | * @since 1.0 |
||
170 | * |
||
171 | * @param CompositePropertyTableDiffIterator $compositePropertyTableDiffIterator |
||
172 | 6 | * |
|
173 | 6 | * @return boolean|null |
|
174 | */ |
||
175 | public function hasChangeToNotifyAbout( CompositePropertyTableDiffIterator $compositePropertyTableDiffIterator ) { |
||
214 | |||
215 | 4 | // 2.4 compat |
|
216 | private function getFixedPropertyValueBy( $tableChangeOp, $key ) { |
||
219 | |||
220 | // 2.4 compat |
||
221 | private function getDataItemById( $id ) { |
||
224 | |||
225 | private function doFilterOnFieldChangeOps( $property, $tableChangeOp, $fieldChangeOps ) { |
||
263 | 4 | ||
264 | 1 | private function doCompareNotificationsOnValuesWithOps( $property, $dataItem, $fieldChangeOp ) { |
|
300 | |||
301 | private function doCompareOnPropertyValues( $dataItem, $propertyValues, $fieldChangeOp, $subobjectName = null ) { |
||
306 | 2 | ||
307 | 2 | private function doCompareFields( $value, $fieldChangeOp, $dataItem, $subobjectName ) { |
|
360 | |||
361 | } |
||
362 |
If an expression can have both
false
, andnull
as possible values. It is generally a good practice to always use strict comparison to clearly distinguish between those two values.