Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like CHTMLTable 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 CHTMLTable, and based on these observations, apply Extract Interface, too.
1 | <?php |
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18 | class CHTMLTable |
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19 | { |
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20 | const FOOTER = 'footer'; |
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21 | |||
22 | private $tableSpec; |
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23 | private $tableHead; |
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24 | private $tableBody; |
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25 | private $tableFoot; |
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26 | |||
27 | /** |
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28 | * Constructor |
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29 | * |
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30 | * Creates a table with table head, table body and if specified, a table |
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31 | * footer. It is possible to specify the table and the tabel cells settings |
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32 | * per column. |
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33 | * |
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34 | * @param [] $tableSpecs table settings. |
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35 | * @param [] $data table cell data. |
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36 | * @param [] $columnSpecs table columns cell settings. |
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37 | */ |
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38 | 10 | public function __construct($tableSpecs = [], $data = [], $columnSpecs = []) |
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42 | |||
43 | /** |
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44 | * Creates a table with cell data. |
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45 | * |
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46 | * Creates a table with table head, table body with table data and if |
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47 | * specified, a table footer. It is possible to specify the table and the |
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48 | * tabel cells settings per column. |
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49 | * |
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50 | * @param [] $tableSpec table settings. |
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51 | * @param [] $data table cell data. |
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52 | * @param [] $columnSpecs table columns cell settings. |
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53 | * |
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54 | * @return object the html table object. |
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55 | */ |
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56 | 10 | public function create($tableSpecs = [], $data = [], $columnSpecs = []) |
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67 | |||
68 | /** |
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69 | * Helper method to reset main parts of table tags. |
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70 | * |
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71 | * Sets the table head, table body and table foot tag to null. |
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72 | * |
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73 | * @return void |
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74 | */ |
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75 | 10 | private function resetTableTags() |
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81 | |||
82 | /** |
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83 | * Helper method to set the table specifications. |
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84 | * |
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85 | * Merges the table specifications with the default specifications. |
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86 | * Default table CSS id is html-table. |
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87 | * |
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88 | * @param [] $table table settings. |
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89 | * |
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90 | * @return void |
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91 | */ |
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92 | 10 | private function setTableSpecifications($tableSpec) |
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105 | |||
106 | /** |
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107 | * Helper method to check if a CSS class tag is present |
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108 | * |
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109 | * Checks if a CSS class tag is present in the table specification. |
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110 | * |
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111 | * @param [] $tableSpec the table specification. |
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112 | * |
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113 | * @return boolean true if class is present in the table specification, |
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114 | * false otherwise. |
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115 | */ |
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116 | 10 | private function isClassPresent($tableSpec) |
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120 | |||
121 | /** |
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122 | * Helper method to reset the id tag. |
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123 | * |
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124 | * Sets the CSS id tag to null. |
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125 | * |
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126 | * @param [] $tableSpec the table specification. |
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127 | * |
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128 | * @return [] the table specification without the CSS id tag. |
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129 | */ |
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130 | 1 | private function removeId($tableSpec) { |
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135 | |||
136 | /** |
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137 | * Helper method to create the table head. |
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138 | * |
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139 | * Creates the table head. The title of the columns are set according to |
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140 | * the table tag in the column specifications. Otherwise, the title is set |
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141 | * to the keys name in the table cell data array. |
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142 | * |
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143 | * @param [] $data table cell data. |
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144 | * @param [] $columnSpecs table columns cell settings. |
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145 | * |
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146 | * @return void |
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147 | */ |
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148 | 10 | private function createTableHead($data, $columnSpecs) |
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163 | |||
164 | /** |
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165 | * Helper method to set the column titles from the data array. |
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166 | * |
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167 | * Uses the first row in the table cell data array to set the titles of |
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168 | * the columns. The name of the columns are the key name in the associative |
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169 | * array containing data for the table. |
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170 | * |
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171 | * @param [] $data table cell data. |
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172 | * |
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173 | * @return void |
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174 | */ |
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175 | 10 | private function setColumnTitlesFromData($data) |
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184 | |||
185 | /** |
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186 | * Helper method to set the column titles from column specifications. |
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187 | * |
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188 | * Uses column specifications to set the name of the columns in the table |
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189 | * head. |
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190 | * |
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191 | * @param [] $columnSpecs table columns cell settings |
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192 | * |
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193 | * @return void |
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194 | */ |
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195 | 6 | private function setColumnTitlesFromColumnSpecifications($columnSpecs) |
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205 | |||
206 | /** |
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207 | * Helper method to check if the column cell belongs to the footer. |
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208 | * |
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209 | * Checks the type tag, in the column specification for one column, if the |
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210 | * tag is present and set to footer. |
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211 | * |
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212 | * @param [] $columnSpec cell settings for one column. |
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213 | * |
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214 | * @return boolean true if the cell type belongs to the footer, false otherwise. |
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215 | */ |
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216 | 6 | private function isTableFooter($columnSpec) |
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227 | |||
228 | /** |
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229 | * Helper method to get title from a column specification, if specified. |
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230 | * |
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231 | * Uses the title tag in the column specification for one column to get |
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232 | * the title. If the title tag is not set, the title is the key name in |
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233 | * the associative array containing data for the table. |
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234 | * |
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235 | * @param [] $key the name of the key for the table cell data. |
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236 | * @param [] $columnSpec cell settings for one column. |
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237 | * |
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238 | * @return [] the name from the title tag in the cell specification. |
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239 | * Otherwise, the table cell data key name. |
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240 | */ |
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241 | 6 | private function getTitle($key, $columnSpec) |
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245 | |||
246 | /** |
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247 | * Helper method to create the table body with table cell data. |
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248 | * |
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249 | * Sets the table cell data in the table body. |
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250 | * |
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251 | * @param [] $data table cell data. |
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252 | * @param [] $columnSpecs table columns cell settings. |
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253 | * |
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254 | * @return void |
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255 | */ |
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256 | 10 | private function createTableBody($data, $columnSpecs) |
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263 | |||
264 | /** |
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265 | * Helper method to set table data in table body. |
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266 | * |
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267 | * Sets table data according to the column specifications, if it is |
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268 | * specified. Otherwise it sets the data as it is stored in the data array. |
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269 | * |
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270 | * @param [] $data table cell data. |
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271 | * @param [] $columnSpecs table columns cell settings. |
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272 | * |
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273 | * @return void |
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274 | */ |
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275 | 10 | private function setTableData($data, $columnSpecs) |
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283 | |||
284 | /** |
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285 | * Helper method to set table data from the data array. |
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286 | * |
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287 | * Sets table data from the data array. |
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288 | * |
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289 | * @param [] $data table cell data. |
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290 | * |
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291 | * @return void |
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292 | */ |
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293 | 10 | private function setTableDataFromData($data) |
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305 | |||
306 | /** |
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307 | * Helper method to set table data according to the column specifications. |
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308 | * |
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309 | * Sets the table data according to the column specifications, if the cell |
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310 | * does not belong to the footer. Adds a colspan tag, if it is specified |
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311 | * for the cell in the column. |
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312 | * |
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313 | * @param [] $data table cell data. |
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314 | * @param [] $columnSpecs table columns cell settings. |
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315 | * |
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316 | * @return void |
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317 | */ |
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318 | 6 | private function setTableDataAsSpecified($data, $columnSpecs) |
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333 | |||
334 | /** |
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335 | * Helper method to get the colspan value, if specified in the column |
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336 | * specification for the cell. |
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337 | * |
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338 | * @param [] $columnSpec cell settings for one column. |
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339 | * |
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340 | * @return int the colspan value if specified. Otherwise null. |
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341 | */ |
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342 | 6 | private function getColspan($columnSpec) |
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346 | |||
347 | /** |
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348 | * Helper method to get the value for a specific position in one row in |
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349 | * the data array. |
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350 | * |
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351 | * Gets the data from a specific position in one row in the data array. |
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352 | * If a function is specified for the cell in the column, the data is |
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353 | * runned through the function before it is returned. |
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354 | * |
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355 | * @param [] $row one row of in the array of table data. |
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356 | * @param string $key the name of the key in the associative data array. |
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357 | * @param [] $columnSpec cell settings for one column. |
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358 | */ |
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359 | 6 | private function getValue($row, $key, $columnSpec) |
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368 | |||
369 | /** |
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370 | * Helper method t check if the function tag is specified for the cells in |
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371 | * one column. |
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372 | * |
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373 | * Checks if the function tag is set for the cell in one column. |
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374 | * |
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375 | * @param [] $columnSpec cell settings for one column. |
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376 | * |
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377 | * @return boolean true if a function is connected to the cell, false otherwise. |
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378 | */ |
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379 | 6 | private function isFunctionSpecified($columnSpec) |
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383 | |||
384 | /** |
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385 | * Helper method to run the value through a function before it is returned. |
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386 | * |
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387 | * Runs the value through a function, if a function is connected to the cell |
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388 | * in the column. If not function is connected to the cell through the |
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389 | * column specification, the value is returned as it is. |
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390 | * |
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391 | * @param [] $columnSpec cell settings for one column |
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392 | * @param mixed $dataValue the value to run through function, if specified. |
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393 | * |
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394 | * @return the value. |
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395 | */ |
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396 | 2 | private function getValueThroughFunction($columnSpec, $dataValue) |
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404 | |||
405 | /** |
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406 | * Helper method to create table footer with data. |
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407 | * |
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408 | * Creates table footer if the cell settings for the column is set to |
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409 | * footer in the column specifications. |
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410 | * Adds a colspan tag, if it is specified for the cell in the column. |
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411 | * |
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412 | * @param [] $columnSpecs table columns cell settings. |
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413 | * |
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414 | * @return void |
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415 | */ |
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416 | 10 | private function createTableFooter($columnSpecs) |
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431 | |||
432 | /** |
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433 | * Helper method to get table footer data. |
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434 | * |
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435 | * Gets table footer data from the column specification. Checks if the |
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436 | * value should be fetched from a function or from the value tag. |
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437 | * If either the function or the value specified, an empty string is |
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438 | * returned. |
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439 | * |
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440 | * @param [] $columnSpec cell settings for one column. |
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441 | * |
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442 | * @return mixed the cell data value. |
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443 | */ |
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444 | 2 | private function getFooterData($columnSpec) |
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452 | |||
453 | /** |
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454 | * Gets the table. |
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455 | * |
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456 | * Gets the table with table data. |
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457 | * |
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458 | * @return html the table with table data. |
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459 | */ |
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460 | 10 | public function getHTMLTable() |
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475 | } |
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476 |
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