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<?php |
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namespace SilverStripe\Config\Middleware; |
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use InvalidArgumentException; |
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use SilverStripe\Config\Collections\DeltaConfigCollection; |
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use SilverStripe\Config\MergeStrategy\Priority; |
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/** |
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* Applies a set of user-customised modifications to config |
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*/ |
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class DeltaMiddleware implements Middleware |
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{ |
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use MiddlewareCommon; |
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/** |
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* Source for deltas |
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* |
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* @var DeltaConfigCollection |
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*/ |
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protected $collection = null; |
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/** |
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* DeltaMiddleware constructor. |
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* |
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* @param DeltaConfigCollection $collection |
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* @param int $disableFlag |
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*/ |
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public function __construct(DeltaConfigCollection $collection, $disableFlag = 0) |
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{ |
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$this->setCollection($collection); |
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$this->setDisableFlag($disableFlag); |
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} |
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/** |
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* @return DeltaConfigCollection |
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*/ |
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public function getCollection() |
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{ |
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return $this->collection; |
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} |
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/** |
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* @param DeltaConfigCollection $collection |
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* @return $this |
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*/ |
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public function setCollection(DeltaConfigCollection $collection) |
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{ |
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$this->collection = $collection; |
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return $this; |
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} |
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/** |
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* Get config for a class |
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* |
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* @param string $class Name of class |
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* @param int|true $excludeMiddleware Middleware disable flags |
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* @param callable $next Callback to next middleware |
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* @return array Complete class config |
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*/ |
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public function getClassConfig($class, $excludeMiddleware, $next) |
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{ |
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// Check if enabled |
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$enabled = $this->enabled($excludeMiddleware); |
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if (!$enabled) { |
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return $next($class, $excludeMiddleware); |
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} |
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// Note: If config is reset, we don't need to call parent config |
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if ($this->getCollection()->isDeltaReset($class)) { |
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$config = []; |
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} else { |
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$config = $next($class, $excludeMiddleware); |
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} |
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// Apply all deltas |
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$deltas = $this->getCollection()->getDeltas($class); |
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foreach ($deltas as $delta) { |
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$config = $this->applyDelta($config, $delta); |
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} |
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return $config; |
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} |
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/** |
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* Apply a single delta to a class config |
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* |
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* @param array $config |
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* @param array $delta |
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* @return array |
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*/ |
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protected function applyDelta($config, $delta) |
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{ |
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switch ($delta['type']) { |
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case DeltaConfigCollection::SET: |
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return array_merge($config, $delta['config']); |
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case DeltaConfigCollection::MERGE: |
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return Priority::mergeArray($delta['config'], $config); |
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case DeltaConfigCollection::CLEAR: |
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return []; |
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case DeltaConfigCollection::REPLACE: |
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return $delta['config']; |
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case DeltaConfigCollection::REMOVE: |
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return array_diff_key($config, $delta['config']); |
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default: |
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throw new InvalidArgumentException("Invalid delta " . $delta['type']); |
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} |
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} |
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} |
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silverstripe /
silverstripe-config
