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UUID.swift
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UUID.swift
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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
@_exported import Foundation // Clang module
import Darwin.uuid
/// Represents UUID strings, which can be used to uniquely identify types, interfaces, and other items.
@available(OSX 10.8, iOS 6.0, *)
public struct UUID : ReferenceConvertible, Hashable, Equatable, CustomStringConvertible {
public typealias ReferenceType = NSUUID
public private(set) var uuid: uuid_t = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
/* Create a new UUID with RFC 4122 version 4 random bytes */
public init() {
withUnsafeMutablePointer(&uuid) {
uuid_generate_random(unsafeBitCast($0, to: UnsafeMutablePointer<UInt8>.self))
}
}
private init(reference: NSUUID) {
var bytes: uuid_t = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
withUnsafeMutablePointer(&bytes) {
reference.getBytes(unsafeBitCast($0, to: UnsafeMutablePointer<UInt8>.self))
}
uuid = bytes
}
/// Create a UUID from a string such as "E621E1F8-C36C-495A-93FC-0C247A3E6E5F".
///
/// Returns nil for invalid strings.
public init?(uuidString string: String) {
let res = withUnsafeMutablePointer(&uuid) {
return uuid_parse(string, unsafeBitCast($0, to: UnsafeMutablePointer<UInt8>.self))
}
if res != 0 {
return nil
}
}
/// Create a UUID from a `uuid_t`.
public init(uuid: uuid_t) {
self.uuid = uuid
}
/// Returns a string created from the UUID, such as "E621E1F8-C36C-495A-93FC-0C247A3E6E5F"
public var uuidString: String {
var bytes: uuid_string_t = (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
var localValue = uuid
return withUnsafeMutablePointers(&localValue, &bytes) { val, str -> String in
uuid_unparse(unsafeBitCast(val, to: UnsafePointer<UInt8>.self), unsafeBitCast(str, to: UnsafeMutablePointer<Int8>.self))
return String(cString: unsafeBitCast(str, to: UnsafePointer<CChar>.self), encoding: .utf8)!
}
}
public var hashValue: Int {
var localValue = uuid
return withUnsafeMutablePointer(&localValue) {
return Int(bitPattern: CFHashBytes(unsafeBitCast($0, to: UnsafeMutablePointer<UInt8>.self), CFIndex(sizeof(uuid_t))))
}
}
public var description: String {
return uuidString
}
public var debugDescription: String {
return description
}
// MARK: - Bridging Support
private var reference: NSUUID {
var bytes = uuid
return withUnsafePointer(&bytes) {
return NSUUID(uuidBytes: unsafeBitCast($0, to: UnsafePointer<UInt8>.self))
}
}
}
public func ==(lhs: UUID, rhs: UUID) -> Bool {
return lhs.uuid.0 == rhs.uuid.0 &&
lhs.uuid.1 == rhs.uuid.1 &&
lhs.uuid.2 == rhs.uuid.2 &&
lhs.uuid.3 == rhs.uuid.3 &&
lhs.uuid.4 == rhs.uuid.4 &&
lhs.uuid.5 == rhs.uuid.5 &&
lhs.uuid.6 == rhs.uuid.6 &&
lhs.uuid.7 == rhs.uuid.7 &&
lhs.uuid.8 == rhs.uuid.8 &&
lhs.uuid.9 == rhs.uuid.9 &&
lhs.uuid.10 == rhs.uuid.10 &&
lhs.uuid.11 == rhs.uuid.11 &&
lhs.uuid.12 == rhs.uuid.12 &&
lhs.uuid.13 == rhs.uuid.13 &&
lhs.uuid.14 == rhs.uuid.14 &&
lhs.uuid.15 == rhs.uuid.15
}
extension UUID : _ObjectiveCBridgeable {
public static func _isBridgedToObjectiveC() -> Bool {
return true
}
@_semantics("convertToObjectiveC")
public func _bridgeToObjectiveC() -> NSUUID {
return reference
}
public static func _forceBridgeFromObjectiveC(_ x: NSUUID, result: inout UUID?) {
if !_conditionallyBridgeFromObjectiveC(x, result: &result) {
fatalError("Unable to bridge \(_ObjectiveCType.self) to \(self)")
}
}
public static func _conditionallyBridgeFromObjectiveC(_ input: NSUUID, result: inout UUID?) -> Bool {
result = UUID(reference: input)
return true
}
public static func _unconditionallyBridgeFromObjectiveC(_ source: NSUUID?) -> UUID {
var result: UUID? = nil
_forceBridgeFromObjectiveC(source!, result: &result)
return result!
}
}