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<?php |
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namespace micmania1\config\MergeStrategy; |
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use micmania1\config\Exceptions\KeyConflictException; |
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use micmania1\config\ConfigCollectionInterface; |
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use micmania1\config\ConfigCollection; |
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use Exception; |
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class NoKeyConflict |
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{ |
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public function merge(ConfigCollectionInterface $mine, ConfigCollectionInterface $theirs) |
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{ |
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foreach ($mine->all() as $key => $item) { |
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// The item doesn exist in theirs, so we can safely set it. |
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if(!$theirs->exists($key)) { |
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$theirs->set($key, $item); |
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continue; |
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} |
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$myValue = $item->getValue(); |
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$theirsItem = $theirs->get($key); |
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$theirsValue = $theirsItem->getValue(); |
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// If two items are the same, we stil overwrite as to keep a record |
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// of the hsitory if this is being tracked. |
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if($myValue === $theirsValue) { |
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$theirs->set($key, $item); |
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continue; |
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} |
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// If the two items aren't an array and they exist then we have a key conflict |
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if(!is_array($myValue) || !is_array($theirsValue)) { |
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throw new KeyConflictException($key, $mine, $theirs); |
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} |
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// By now we know that both items are arrays - we need to merge them together |
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// without key conflicts |
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try { |
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$value = $this->mergeArrays($myValue, $theirsValue); |
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} catch (Exception $e) { |
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// The array has a key conflict |
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throw new KeyConflictException($key, $mine, $theirs); |
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} |
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// The item already exists in theirs, so we just update that. |
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$theirsItem->set($value); |
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} |
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return $theirs; |
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} |
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/** |
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* This (almost) mimics the functionality as above, but works with arrays instead of |
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* collections. |
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* |
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* @param array $mine |
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* @param array $theirs |
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* |
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* @return array |
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*/ |
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protected function mergeArrays($mine, $theirs) |
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{ |
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foreach($mine as $key => $value) { |
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// If they key doesn't exist in theirs, we can safely set it |
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if(!isset($theirs[$key])) { |
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$theirs[$key] = $value; |
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continue; |
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} |
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// The value is the same so we can skip to the next one. |
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if ($mine[$key] === $theirs[$key]) { |
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continue; |
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} |
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// If the values aren't arrays, then we have a key conflict |
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if(!is_array($value) || !is_array($theirs[$key])) { |
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throw new Exception("There is a key conflict in array."); |
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} |
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$theirs[$key] = $this->mergeArrays($value, $theirs[$key]); |
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} |
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return $theirs; |
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} |
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} |
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micmania1 /
silverstripe-config
