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<?php |
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declare(strict_types=1); |
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namespace gamringer\JSONPatch; |
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use gamringer\JSONPointer; |
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use gamringer\JSONPointer\Pointer; |
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class Patch |
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{ |
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protected $operations = []; |
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public static function fromJSON(string $patchContent) |
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{ |
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$patch = new static(); |
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$patchContent = self::decodePatchContent($patchContent); |
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foreach ($patchContent as $operationContent) { |
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$operation = Operation::fromDecodedJSON($operationContent); |
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$patch->addOperation($operation); |
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} |
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return $patch; |
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} |
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public function apply(&$target) |
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{ |
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$jsonPointer = new Pointer($target); |
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try { |
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foreach ($this->operations as $i => $operation) { |
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$operation->apply($jsonPointer); |
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} |
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} catch (Operation\Exception $e) { |
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$this->revert($jsonPointer, $i); |
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throw new Exception('An Operation failed', 1, $e); |
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} |
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} |
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private function revert(Pointer $jsonPointer, $index) |
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{ |
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$operations = array_reverse(array_slice($this->operations, 0, $index)); |
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try { |
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foreach ($operations as $operation) { |
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$operation->revert($jsonPointer); |
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} |
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} catch (Operation\Exception $e) { |
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throw new Exception('An Operation failed and the reverting process also failed', 2, $e); |
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} |
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} |
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public function addOperation(Operation\Atomic $operation) |
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{ |
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$this->operations[] = $operation; |
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} |
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public function __toString() |
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{ |
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return '['.implode(',', $this->operations).']'; |
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} |
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private static function decodePatchContent($patchContent) |
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{ |
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$patchContent = json_decode($patchContent); |
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if (json_last_error() != JSON_ERROR_NONE) { |
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throw new Exception('Content of source patch file could not be decoded', 3); |
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} |
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if (!is_array($patchContent)) { |
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throw new Exception('Content of source patch file is not a collection', 4); |
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} |
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return $patchContent; |
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} |
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} |
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gamringer /
JSONPatch
