93 lines
2.6 KiB
Swift
93 lines
2.6 KiB
Swift
//
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// Copyright 2019 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import Foundation
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import GRDB
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// This class can be used to convert database values to Swift values.
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//
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// TODO: Maybe we should rename this to a SDSSerializer protocol and
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// move these methods to an extension?
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public class SDSDeserialization {
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private init() {}
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// MARK: - Data
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public class func required<T>(
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_ value: T?,
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name: String,
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_ file: StaticString = #file,
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_ function: StaticString = #function,
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_ line: UInt = #line
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) throws -> T {
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guard let value = value else {
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owsFailDebug("Missing required field: \(name).")
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throw SDSError.missingRequiredField(file, function, line)
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}
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return value
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}
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// MARK: - Data
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public class func optionalData(_ value: Data?, name: String) -> Data? {
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return value
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}
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// MARK: - Date
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public class func requiredDoubleAsDate(_ value: Double, name: String) -> Date {
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return Date(timeIntervalSince1970: value)
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}
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public class func optionalDoubleAsDate(_ value: Double?, name: String) -> Date? {
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guard let value = value else {
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return nil
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}
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return requiredDoubleAsDate(value, name: name)
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}
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// MARK: - Numeric Primitive
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public class func optionalNumericAsNSNumber<T>(_ value: T?, name: String, conversion: (T) -> NSNumber) -> NSNumber? {
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guard let value = value else {
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return nil
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}
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return conversion(value)
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}
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// MARK: - Blob
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public class func optionalUnarchive<T: Any>(_ encoded: Data?, name: String) throws -> T? {
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guard let encoded = encoded else {
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return nil
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}
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return try unarchive(encoded, name: name)
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}
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public class func unarchive<T: Any>(
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_ encoded: Data?,
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name: String,
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_ file: StaticString = #file,
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_ function: StaticString = #function,
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_ line: UInt = #line
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) throws -> T {
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guard let encoded = encoded else {
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owsFailDebug("Missing required field: \(name).")
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throw SDSError.missingRequiredField(file, function, line)
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}
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do {
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guard let decoded = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(encoded) as? T else {
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owsFailDebug("Invalid value: \(name).")
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throw SDSError.invalidValue(file, function, line)
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}
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return decoded
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} catch {
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owsFailDebug("Read failed[\(name)]: \(error).")
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throw SDSError.invalidValue(file, function, line)
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}
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}
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}
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