Complex classes like VirtualPage 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 VirtualPage, and based on these observations, apply Extract Interface, too.
1 | <?php |
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23 | class VirtualPage extends Page { |
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24 | |||
25 | private static $description = 'Displays the content of another page'; |
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26 | |||
27 | public static $virtualFields; |
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28 | |||
29 | /** |
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30 | * @var array Define fields that are not virtual - the virtual page must define these fields themselves. |
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31 | * Note that anything in {@link self::config()->initially_copied_fields} is implicitly included in this list. |
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32 | */ |
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33 | private static $non_virtual_fields = array( |
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34 | "ID", |
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35 | "ClassName", |
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36 | "ObsoleteClassName", |
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37 | "SecurityTypeID", |
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38 | "OwnerID", |
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39 | "ParentID", |
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40 | "URLSegment", |
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41 | "Sort", |
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42 | "Status", |
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43 | 'ShowInMenus', |
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44 | // 'Locale' |
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45 | 'ShowInSearch', |
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46 | 'Version', |
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47 | "Embargo", |
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48 | "Expiry", |
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49 | "CanViewType", |
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50 | "CanEditType", |
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51 | "CopyContentFromID", |
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52 | "HasBrokenLink", |
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53 | ); |
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54 | |||
55 | /** |
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56 | * @var array Define fields that are initially copied to virtual pages but left modifiable after that. |
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57 | */ |
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58 | private static $initially_copied_fields = array( |
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59 | 'ShowInMenus', |
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60 | 'ShowInSearch', |
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61 | 'URLSegment', |
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62 | ); |
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63 | |||
64 | private static $has_one = array( |
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65 | "CopyContentFrom" => "SilverStripe\\CMS\\Model\\SiteTree", |
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66 | ); |
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67 | |||
68 | private static $owns = array( |
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69 | "CopyContentFrom", |
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70 | ); |
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71 | |||
72 | private static $db = array( |
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73 | "VersionID" => "Int", |
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74 | ); |
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75 | |||
76 | private static $table_name = 'VirtualPage'; |
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77 | |||
78 | /** |
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79 | * Generates the array of fields required for the page type. |
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80 | * |
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81 | * @return array |
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82 | */ |
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83 | public function getVirtualFields() { |
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95 | |||
96 | /** |
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97 | * List of fields or properties to never virtualise |
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98 | * |
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99 | * @return array |
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100 | */ |
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101 | public function getNonVirtualisedFields() { |
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104 | |||
105 | public function setCopyContentFromID($val) { |
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112 | |||
113 | public function ContentSource() { |
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120 | |||
121 | /** |
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122 | * For VirtualPage, add a canonical link tag linking to the original page |
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123 | * See TRAC #6828 & http://support.google.com/webmasters/bin/answer.py?hl=en&answer=139394 |
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124 | * |
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125 | * @param boolean $includeTitle Show default <title>-tag, set to false for custom templating |
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126 | * @return string The XHTML metatags |
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127 | */ |
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128 | public function MetaTags($includeTitle = true) { |
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137 | |||
138 | public function allowedChildren() { |
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145 | |||
146 | public function syncLinkTracking() { |
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153 | |||
154 | /** |
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155 | * We can only publish the page if there is a published source page |
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156 | * |
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157 | * @param Member $member Member to check |
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158 | * @return bool |
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159 | */ |
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160 | public function canPublish($member = null) { |
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163 | |||
164 | /** |
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165 | * Returns true if is page is publishable by anyone at all |
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166 | * Return false if the source page isn't published yet. |
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167 | * |
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168 | * Note that isPublishable doesn't affect ete from live, only publish. |
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169 | */ |
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170 | public function isPublishable() { |
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184 | |||
185 | /** |
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186 | * Generate the CMS fields from the fields from the original page. |
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187 | */ |
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188 | public function getCMSFields() { |
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253 | |||
254 | public function onBeforeWrite() { |
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258 | |||
259 | /** |
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260 | * Copy any fields from the copied record to bootstrap /backup |
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261 | */ |
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262 | protected function refreshFromCopied() { |
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282 | |||
283 | public function getSettingsFields() { |
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302 | |||
303 | public function validate() { |
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322 | |||
323 | public function updateImageTracking() { |
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333 | |||
334 | /** |
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335 | * @param string $numChildrenMethod |
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336 | * @return string |
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337 | */ |
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338 | public function CMSTreeClasses($numChildrenMethod="numChildren") { |
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341 | |||
342 | /** |
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343 | * Allow attributes on the master page to pass |
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344 | * through to the virtual page |
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345 | * |
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346 | * @param string $field |
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347 | * @return mixed |
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348 | */ |
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349 | public function __get($field) { |
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361 | |||
362 | public function getField($field) { |
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368 | |||
369 | /** |
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370 | * Check if given field is virtualised |
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371 | * |
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372 | * @param string $field |
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373 | * @return bool |
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374 | */ |
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375 | public function isFieldVirtualised($field) { |
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391 | |||
392 | /** |
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393 | * Pass unrecognized method calls on to the original data object |
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394 | * |
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395 | * @param string $method |
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396 | * @param string $args |
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397 | * @return mixed |
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398 | */ |
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399 | public function __call($method, $args) { |
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406 | |||
407 | /** |
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408 | * @param string $field |
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409 | * @return bool |
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410 | */ |
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411 | public function hasField($field) { |
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418 | |||
419 | /** |
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420 | * Return the "casting helper" (a piece of PHP code that when evaluated creates a casted value object) for a field |
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421 | * on this object. |
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422 | * |
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423 | * @param string $field |
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424 | * @return string |
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425 | */ |
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426 | public function castingHelper($field) { |
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433 | |||
434 | /** |
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435 | * {@inheritdoc} |
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436 | */ |
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437 | public function allMethodNames($custom = false) { |
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446 | |||
447 | /** |
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448 | * {@inheritdoc} |
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449 | */ |
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450 | public function getControllerName() { |
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457 | |||
458 | /** |
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459 | * {@inheritDoc} |
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460 | */ |
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461 | public function getFrontendControllerName() |
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469 | |||
470 | } |
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471 |
It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: