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BaseFactory.php
60 lines
| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Matomo - free/libre analytics platform |
| 5 | * |
| 6 | * @link https://matomo.org |
| 7 | * @license https://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later |
| 8 | */ |
| 9 | namespace Piwik; |
| 10 | |
| 11 | use Exception; |
| 12 | /** |
| 13 | * Base class for all factory types. |
| 14 | * |
| 15 | * Factory types are base classes that contain a **factory** method. This method is used to instantiate |
| 16 | * concrete instances by a specified string ID. Fatal errors do not occur if a class does not exist. |
| 17 | * Instead an exception is thrown. |
| 18 | * |
| 19 | * Derived classes should override the **getClassNameFromClassId** and **getInvalidClassIdExceptionMessage** |
| 20 | * static methods. |
| 21 | */ |
| 22 | abstract class BaseFactory |
| 23 | { |
| 24 | /** |
| 25 | * Creates a new instance of a class using a string ID. |
| 26 | * |
| 27 | * @param string $classId The ID of the class. |
| 28 | * @return \Piwik\DataTable\Renderer |
| 29 | * @throws Exception if $classId is invalid. |
| 30 | */ |
| 31 | public static function factory($classId) |
| 32 | { |
| 33 | $className = static::getClassNameFromClassId($classId); |
| 34 | if (!class_exists($className)) { |
| 35 | self::sendPlainHeader(); |
| 36 | throw new Exception(static::getInvalidClassIdExceptionMessage($classId)); |
| 37 | } |
| 38 | return new $className(); |
| 39 | } |
| 40 | private static function sendPlainHeader() |
| 41 | { |
| 42 | \Piwik\Common::sendHeader('Content-Type: text/plain; charset=utf-8'); |
| 43 | } |
| 44 | /** |
| 45 | * Should return a class name based on the class's associated string ID. |
| 46 | */ |
| 47 | protected static function getClassNameFromClassId($id) |
| 48 | { |
| 49 | return $id; |
| 50 | } |
| 51 | /** |
| 52 | * Should return a message to use in an Exception when an invalid class ID is supplied to |
| 53 | * {@link factory()}. |
| 54 | */ |
| 55 | protected static function getInvalidClassIdExceptionMessage($id) |
| 56 | { |
| 57 | return "Invalid class ID '{$id}' for " . get_called_class() . "::factory()."; |
| 58 | } |
| 59 | } |
| 60 |