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"content": "<?php\n\ndeclare(strict_types=1);\n\nnamespace Domain\\ValueObject;\n\n\/\/ @responsibility: Immutables Value Object für Chat-Session-UUID\n\nuse InvalidArgumentException;\n\nfinal class SessionUuid\n{\n private const UUID_PATTERN = '\/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$\/i';\n\n private string $value;\n\n private function __construct(string $value)\n {\n $this->value = $value;\n }\n\n \/**\n * Create from existing UUID string.\n *\n * @throws InvalidArgumentException\n *\/\n public static function fromString(string $uuid): self\n {\n $uuid = strtolower(trim($uuid));\n\n if (!self::isValid($uuid)) {\n throw new InvalidArgumentException(\"Invalid UUID v4 format: {$uuid}\");\n }\n\n return new self($uuid);\n }\n\n \/**\n * Generate a new UUID v4.\n *\/\n public static function generate(): self\n {\n $data = random_bytes(16);\n $data[6] = chr(ord($data[6]) & 0x0f | 0x40);\n $data[8] = chr(ord($data[8]) & 0x3f | 0x80);\n\n $uuid = vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));\n\n return new self($uuid);\n }\n\n \/**\n * Check if a string is a valid UUID v4.\n *\/\n public static function isValid(string $uuid): bool\n {\n return preg_match(self::UUID_PATTERN, $uuid) === 1;\n }\n\n public function value(): string\n {\n return $this->value;\n }\n\n public function __toString(): string\n {\n return $this->value;\n }\n\n public function equals(self $other): bool\n {\n return $this->value === $other->value;\n }\n}\n",
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