Complex classes like DataTable 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 DataTable, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
||
| 25 | class DataTable extends Widget { |
||
| 26 | use TableTrait,DataTableFieldAsTrait,HasCheckboxesTrait; |
||
| 27 | protected $_searchField; |
||
| 28 | protected $_urls; |
||
| 29 | protected $_pagination; |
||
| 30 | protected $_compileParts; |
||
| 31 | protected $_deleteBehavior; |
||
| 32 | protected $_editBehavior; |
||
| 33 | protected $_visibleHover=false; |
||
| 34 | protected $_targetSelector; |
||
| 35 | protected $_refreshSelector; |
||
| 36 | protected $_emptyMessage; |
||
| 37 | protected $_json; |
||
| 38 | protected $_rowClass=""; |
||
| 39 | protected $_sortable; |
||
| 40 | protected $_hiddenColumns; |
||
| 41 | protected $_colWidths; |
||
| 42 | |||
| 43 | |||
| 44 | public function __construct($identifier,$model,$modelInstance=NULL) { |
||
| 45 | parent::__construct($identifier, $model,$modelInstance); |
||
| 46 | $this->_init(new InstanceViewer($identifier), "table", new HtmlTable($identifier, 0,0), false); |
||
| 47 | $this->_urls=[]; |
||
| 48 | $this->_emptyMessage=new HtmlMessage("","nothing to display"); |
||
| 49 | $this->_emptyMessage->setIcon("info circle"); |
||
| 50 | } |
||
| 51 | |||
| 52 | public function run(JsUtils $js){ |
||
| 53 | if($this->_hasCheckboxes && isset($js)){ |
||
| 54 | $this->_runCheckboxes($js); |
||
| 55 | } |
||
| 56 | if($this->_visibleHover){ |
||
| 57 | $js->execOn("mouseover", "#".$this->identifier." tr", "$(event.target).closest('tr').find('.visibleover').css('visibility', 'visible');",["preventDefault"=>false,"stopPropagation"=>true]); |
||
| 58 | $js->execOn("mouseout", "#".$this->identifier." tr", "$(event.target).closest('tr').find('.visibleover').css('visibility', 'hidden');",["preventDefault"=>false,"stopPropagation"=>true]); |
||
| 59 | } |
||
| 60 | if(\is_array($this->_deleteBehavior)) |
||
| 61 | $this->_generateBehavior("delete",$this->_deleteBehavior, $js); |
||
| 62 | if(\is_array($this->_editBehavior)) |
||
| 63 | $this->_generateBehavior("edit",$this->_editBehavior,$js); |
||
| 64 | return parent::run($js); |
||
| 65 | } |
||
| 66 | |||
| 67 | |||
| 68 | |||
| 69 | protected function _generateBehavior($op,$params,JsUtils $js){ |
||
| 70 | if(isset($this->_urls[$op])){ |
||
| 71 | $params=\array_merge($params,["attr"=>"data-ajax"]); |
||
| 72 | $js->getOnClick("#".$this->identifier." ._".$op, $this->_urls[$op],$this->getTargetSelector(),$params); |
||
| 73 | } |
||
| 74 | } |
||
| 75 | |||
| 76 | /** |
||
| 77 | * {@inheritDoc} |
||
| 78 | * @see \Ajax\semantic\html\collections\table\TableTrait::getTable() |
||
| 79 | */ |
||
| 80 | protected function getTable() { |
||
| 81 | return $this->content["table"]; |
||
| 82 | } |
||
| 83 | |||
| 84 | |||
| 85 | public function compile(JsUtils $js=NULL,&$view=NULL){ |
||
| 86 | if(!$this->_generated){ |
||
| 87 | $this->_instanceViewer->setInstance($this->_model); |
||
| 88 | $captions=$this->_instanceViewer->getCaptions(); |
||
| 89 | |||
| 90 | $table=$this->content["table"]; |
||
| 91 | |||
| 92 | if($this->_hasCheckboxes){ |
||
| 93 | $this->_generateMainCheckbox($captions); |
||
| 94 | } |
||
| 95 | |||
| 96 | $table->setRowCount(0, \sizeof($captions)); |
||
| 97 | $this->_generateHeader($table,$captions); |
||
| 98 | |||
| 99 | if(isset($this->_compileParts)) |
||
| 100 | $table->setCompileParts($this->_compileParts); |
||
| 101 | |||
| 102 | if(isset($this->_searchField) && isset($js)){ |
||
| 103 | if(isset($this->_urls["refresh"])) |
||
| 104 | $this->_searchField->postOn("change", $this->_urls["refresh"],"{'s':$(this).val()}","#".$this->identifier." tbody",["preventDefault"=>false,"jqueryDone"=>"replaceWith"]); |
||
| 105 | } |
||
| 106 | |||
| 107 | $this->_generateContent($table); |
||
| 108 | |||
| 109 | if($this->_hasCheckboxes && $table->hasPart("thead")){ |
||
| 110 | $table->getHeader()->getCell(0, 0)->addClass("no-sort"); |
||
| 111 | } |
||
| 112 | |||
| 113 | if(isset($this->_toolbar)){ |
||
| 114 | $this->_setToolbarPosition($table, $captions); |
||
| 115 | } |
||
| 116 | if(isset($this->_pagination) && $this->_pagination->getVisible()){ |
||
| 117 | $this->_generatePagination($table,$js); |
||
| 118 | } |
||
| 119 | |||
| 120 | $this->content=JArray::sortAssociative($this->content, [PositionInTable::BEFORETABLE,"table",PositionInTable::AFTERTABLE]); |
||
| 121 | $this->_compileForm(); |
||
| 122 | if(isset($this->_hiddenColumns)) |
||
| 123 | $this->_hideColumns(); |
||
| 124 | if(isset($this->_colWidths)){ |
||
| 125 | foreach ($this->_colWidths as $colIndex=>$width){ |
||
| 126 | $table->setColWidth($colIndex,$width); |
||
| 127 | } |
||
| 128 | } |
||
| 129 | |||
| 130 | $this->_generated=true; |
||
| 131 | } |
||
| 132 | return parent::compile($js,$view); |
||
| 133 | } |
||
| 134 | |||
| 135 | protected function _hideColumns(){ |
||
| 136 | $table=$this->getTable(); |
||
| 137 | foreach ($this->_hiddenColumns as $colIndex){ |
||
| 138 | $table->hideColumn($colIndex); |
||
| 139 | } |
||
| 140 | return $this; |
||
| 141 | } |
||
| 142 | |||
| 143 | protected function _generateHeader(HtmlTable $table,$captions){ |
||
| 144 | $table->setHeaderValues($captions); |
||
| 145 | if(isset($this->_sortable)){ |
||
| 146 | $table->setSortable($this->_sortable); |
||
| 147 | } |
||
| 148 | } |
||
| 149 | |||
| 150 | |||
| 151 | |||
| 152 | protected function _generateContent($table){ |
||
| 153 | $objects=$this->_modelInstance; |
||
| 154 | if(isset($this->_pagination)){ |
||
| 155 | $objects=$this->_pagination->getObjects($this->_modelInstance); |
||
| 156 | } |
||
| 157 | InstanceViewer::setIndex(0); |
||
| 158 | $table->fromDatabaseObjects($objects, function($instance) use($table){ |
||
| 159 | return $this->_generateRow($instance, $table); |
||
| 160 | }); |
||
| 161 | if($table->getRowCount()==0){ |
||
| 162 | $result=$table->addRow(); |
||
| 163 | $result->mergeRow(); |
||
| 164 | $result->setValues([$this->_emptyMessage]); |
||
| 165 | } |
||
| 166 | } |
||
| 167 | |||
| 168 | protected function _generateRow($instance,&$table,$checkedClass=null){ |
||
| 169 | $this->_instanceViewer->setInstance($instance); |
||
| 170 | InstanceViewer::$index++; |
||
| 171 | $values= $this->_instanceViewer->getValues(); |
||
| 172 | $id=$this->_instanceViewer->getIdentifier(); |
||
| 173 | if($this->_hasCheckboxes){ |
||
| 174 | $ck=new HtmlCheckbox("ck-".$this->identifier."-".$id,""); |
||
| 175 | $ck->setOnChange("event.stopPropagation();"); |
||
| 176 | $field=$ck->getField(); |
||
| 177 | $field->setProperty("value",$id); |
||
| 178 | $field->setProperty("name", "selection[]"); |
||
| 179 | if(isset($checkedClass)) |
||
| 180 | $field->setClass($checkedClass); |
||
| 181 | \array_unshift($values, $ck); |
||
| 182 | } |
||
| 183 | $result=$table->newRow(); |
||
| 184 | $result->setIdentifier($this->identifier."-tr-".$id); |
||
| 185 | $result->setProperty("data-ajax",$id); |
||
| 186 | $result->setValues($values); |
||
| 187 | $result->addToProperty("class",$this->_rowClass); |
||
| 188 | return $result; |
||
| 189 | } |
||
| 190 | |||
| 191 | protected function _generatePagination($table,$js=NULL){ |
||
| 192 | if(isset($this->_toolbar)){ |
||
| 193 | if($this->_toolbarPosition==PositionInTable::FOOTER) |
||
| 194 | $this->_toolbar->setFloated("left"); |
||
| 195 | } |
||
| 196 | $footer=$table->getFooter(); |
||
| 197 | $footer->mergeCol(); |
||
| 198 | $menu=new HtmlPaginationMenu("pagination-".$this->identifier,$this->_pagination->getPagesNumbers()); |
||
| 199 | $menu->floatRight(); |
||
| 200 | $menu->setActiveItem($this->_pagination->getPage()-1); |
||
| 201 | $footer->addValues($menu); |
||
| 202 | $this->_associatePaginationBehavior($menu,$js); |
||
| 203 | } |
||
| 204 | |||
| 205 | protected function _associatePaginationBehavior(HtmlMenu $menu,JsUtils $js=NULL){ |
||
| 206 | if(isset($this->_urls["refresh"])){ |
||
| 207 | $menu->postOnClick($this->_urls["refresh"],"{'p':$(this).attr('data-page')}",$this->getRefreshSelector(),["preventDefault"=>false,"jqueryDone"=>"replaceWith"]); |
||
| 208 | } |
||
| 209 | } |
||
| 210 | |||
| 211 | protected function _getFieldName($index){ |
||
| 212 | $fieldName=parent::_getFieldName($index); |
||
| 213 | if(\is_object($fieldName)) |
||
| 214 | $fieldName="field-".$index; |
||
| 215 | return $fieldName."[]"; |
||
| 216 | } |
||
| 217 | |||
| 218 | protected function _getFieldCaption($index){ |
||
| 219 | return null; |
||
| 220 | } |
||
| 221 | |||
| 222 | protected function _setToolbarPosition($table,$captions=NULL){ |
||
| 223 | switch ($this->_toolbarPosition){ |
||
| 224 | case PositionInTable::BEFORETABLE: |
||
| 225 | case PositionInTable::AFTERTABLE: |
||
| 226 | if(isset($this->_compileParts)===false){ |
||
| 227 | $this->content[$this->_toolbarPosition]=$this->_toolbar; |
||
| 228 | } |
||
| 229 | break; |
||
| 230 | case PositionInTable::HEADER: |
||
| 231 | case PositionInTable::FOOTER: |
||
| 232 | case PositionInTable::BODY: |
||
| 233 | $this->addToolbarRow($this->_toolbarPosition,$table, $captions); |
||
| 234 | break; |
||
| 235 | } |
||
| 236 | } |
||
| 237 | |||
| 238 | /** |
||
| 239 | * Associates a $callback function after the compilation of the field at $index position |
||
| 240 | * The $callback function can take the following arguments : $field=>the compiled field, $instance : the active instance of the object, $index: the field position |
||
| 241 | * @param int $index postion of the compiled field |
||
| 242 | * @param callable $callback function called after the field compilation |
||
| 243 | * @return DataTable |
||
| 244 | */ |
||
| 245 | public function afterCompile($index,$callback){ |
||
| 246 | $this->_instanceViewer->afterCompile($index,$callback); |
||
| 247 | return $this; |
||
| 248 | } |
||
| 249 | |||
| 250 | private function addToolbarRow($part,$table,$captions){ |
||
| 251 | $hasPart=$table->hasPart($part); |
||
| 252 | if($hasPart){ |
||
| 253 | $row=$table->getPart($part)->addRow(\sizeof($captions)); |
||
| 254 | }else{ |
||
| 255 | $row=$table->getPart($part)->getRow(0); |
||
| 256 | } |
||
| 257 | $row->mergeCol(); |
||
| 258 | $row->setValues([$this->_toolbar]); |
||
| 259 | } |
||
| 260 | |||
| 261 | public function getHtmlComponent(){ |
||
| 262 | return $this->content["table"]; |
||
| 263 | } |
||
| 264 | |||
| 265 | public function getUrls() { |
||
| 266 | return $this->_urls; |
||
| 267 | } |
||
| 268 | |||
| 269 | /** |
||
| 270 | * Sets the associative array of urls for refreshing, updating or deleting |
||
| 271 | * @param string|array $urls associative array with keys refresh: for refreshing with search field or pagination, edit : for updating a row, delete: for deleting a row |
||
| 272 | * @return DataTable |
||
| 273 | */ |
||
| 274 | public function setUrls($urls) { |
||
| 275 | if(\is_array($urls)){ |
||
| 276 | $this->_urls["refresh"]=JArray::getValue($urls, "refresh",0); |
||
| 277 | $this->_urls["edit"]=JArray::getValue($urls, "edit",1); |
||
| 278 | $this->_urls["delete"]=JArray::getValue($urls, "delete",2); |
||
| 279 | }else{ |
||
| 280 | $this->_urls=["refresh"=>$urls,"edit"=>$urls,"delete"=>$urls]; |
||
| 281 | } |
||
| 282 | return $this; |
||
| 283 | } |
||
| 284 | |||
| 285 | /** |
||
| 286 | * Paginates the DataTable element with a Semantic HtmlPaginationMenu component |
||
| 287 | * @param number $page the active page number |
||
| 288 | * @param number $total_rowcount the total number of items |
||
| 289 | * @param number $items_per_page The number of items per page |
||
| 290 | * @param number $pages_visibles The number of visible pages in the Pagination component |
||
| 291 | * @return DataTable |
||
| 292 | */ |
||
| 293 | public function paginate($page,$total_rowcount,$items_per_page=10,$pages_visibles=null){ |
||
| 294 | $this->_pagination=new Pagination($items_per_page,$pages_visibles,$page,$total_rowcount); |
||
| 295 | return $this; |
||
| 296 | } |
||
| 297 | |||
| 298 | /** |
||
| 299 | * Auto Paginates the DataTable element with a Semantic HtmlPaginationMenu component |
||
| 300 | * @param number $page the active page number |
||
| 301 | * @param number $items_per_page The number of items per page |
||
| 302 | * @param number $pages_visibles The number of visible pages in the Pagination component |
||
| 303 | * @return DataTable |
||
| 304 | */ |
||
| 305 | public function autoPaginate($page=1,$items_per_page=10,$pages_visibles=4){ |
||
| 306 | $this->_pagination=new Pagination($items_per_page,$pages_visibles,$page); |
||
| 307 | return $this; |
||
| 308 | } |
||
| 309 | |||
| 310 | |||
| 311 | |||
| 312 | /** |
||
| 313 | * @param array $compileParts |
||
| 314 | * @return DataTable |
||
| 315 | */ |
||
| 316 | public function refresh($compileParts=["tbody"]){ |
||
| 317 | $this->_compileParts=$compileParts; |
||
| 318 | return $this; |
||
| 319 | } |
||
| 320 | |||
| 321 | |||
| 322 | public function addSearchInToolbar($position=Direction::RIGHT){ |
||
| 325 | |||
| 326 | public function getSearchField(){ |
||
| 333 | |||
| 334 | /** |
||
| 335 | * The callback function called after the insertion of each row when fromDatabaseObjects is called |
||
| 336 | * callback function takes the parameters $row : the row inserted and $object: the instance of model used |
||
| 337 | * @param callable $callback |
||
| 338 | * @return DataTable |
||
| 339 | */ |
||
| 340 | public function onNewRow($callback) { |
||
| 344 | |||
| 345 | public function asForm(){ |
||
| 348 | |||
| 349 | |||
| 350 | |||
| 351 | protected function getTargetSelector() { |
||
| 352 | $result=$this->_targetSelector; |
||
| 353 | if(!isset($result)) |
||
| 354 | $result="#".$this->identifier; |
||
| 355 | return $result; |
||
| 356 | } |
||
| 357 | |||
| 358 | /** |
||
| 359 | * Sets the response element selector for Edit and Delete request with ajax |
||
| 360 | * @param string $_targetSelector |
||
| 361 | * @return \Ajax\semantic\widgets\datatable\DataTable |
||
| 362 | */ |
||
| 363 | public function setTargetSelector($_targetSelector) { |
||
| 364 | $this->_targetSelector=$_targetSelector; |
||
| 365 | return $this; |
||
| 366 | } |
||
| 367 | |||
| 368 | public function getRefreshSelector() { |
||
| 369 | if(isset($this->_refreshSelector)) |
||
| 370 | return $this->_refreshSelector; |
||
| 371 | return "#".$this->identifier." tbody"; |
||
| 372 | } |
||
| 373 | |||
| 374 | /** |
||
| 375 | * @param string $_refreshSelector |
||
| 376 | * @return DataTable |
||
| 377 | */ |
||
| 378 | public function setRefreshSelector($_refreshSelector) { |
||
| 382 | |||
| 383 | /** |
||
| 384 | * {@inheritDoc} |
||
| 385 | * @see \Ajax\common\Widget::show() |
||
| 386 | */ |
||
| 387 | public function show($modelInstance){ |
||
| 394 | |||
| 395 | public function getRowClass() { |
||
| 398 | |||
| 399 | /** |
||
| 400 | * Sets the default row class (tr class) |
||
| 401 | * @param string $_rowClass |
||
| 402 | * @return DataTable |
||
| 403 | */ |
||
| 404 | public function setRowClass($_rowClass) { |
||
| 408 | |||
| 409 | /** |
||
| 410 | * Sets the message displayed when there is no record |
||
| 411 | * @param mixed $_emptyMessage |
||
| 412 | * @return DataTable |
||
| 413 | */ |
||
| 414 | public function setEmptyMessage($_emptyMessage) { |
||
| 418 | |||
| 419 | public function setSortable($colIndex=NULL) { |
||
| 423 | |||
| 424 | public function setActiveRowSelector($class="active",$event="click",$multiple=false){ |
||
| 428 | |||
| 429 | public function hideColumn($colIndex){ |
||
| 435 | |||
| 436 | public function setColWidth($colIndex,$width){ |
||
| 444 | |||
| 445 | |||
| 446 | } |
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 sub-classes 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 parent class: