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automatic resolution switching

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patrick-zippenfenig 2022-08-07 12:42:11 +02:00
parent 90d3a002fa
commit f235ad0801
2 changed files with 42 additions and 12 deletions
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48
Sources/SwiftTimeZoneLookup/SwiftTimeZoneLookup.swift
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@ -8,34 +8,60 @@ public enum SwiftTimeZoneLookupError: Error {
public struct SwiftTimeZoneLookupResult {
/// Timezone identifier like `Europe/Berlin`
let timezone: String
public let timezone: String
/// Country name like `Germany`
let countryName: String?
public let countryName: String?
/// 2 character country code like `DE` for Germany
let countryAlpha2: String?
public let countryAlpha2: String?
}
public final class SwiftTimeZoneLookup {
private let database: OpaquePointer
/// 0.00017 degrees (~20m) resolution
private let database21: OpaquePointer
/// 0.0055 degrees (~0.5km) resolution
private let database16: OpaquePointer
/// Throws if the timezone database could not be opened
public init() throws {
guard let timezone21 = Bundle.module.url(forResource: "timezone21", withExtension: "bin") else {
throw SwiftTimeZoneLookupError.couldNotFindTimezone21bin
}
guard let database = timezone21.withUnsafeFileSystemRepresentation({ timezone21 in
ZDOpenDatabase(timezone21)
}) else {
guard let timezone16 = Bundle.module.url(forResource: "timezone16", withExtension: "bin") else {
throw SwiftTimeZoneLookupError.couldNotFindTimezone21bin
}
guard let database21 = timezone21.withUnsafeFileSystemRepresentation(ZDOpenDatabase) else {
throw SwiftTimeZoneLookupError.couldNotOpenDatabase
}
self.database = database
guard let database16 = timezone16.withUnsafeFileSystemRepresentation(ZDOpenDatabase) else {
throw SwiftTimeZoneLookupError.couldNotOpenDatabase
}
self.database21 = database21
self.database16 = database16
}
/// Try with lower resolution first and use high resolution database if too close to the border
private func highResLookup(latitude: Float, longitude: Float) -> UnsafeMutablePointer<ZoneDetectResult>? {
var safezone: Float = .nan
guard let result = ZDLookup(database16, latitude, longitude, &safezone) else {
return nil
}
if safezone >= 0.0055*2 {
return result
}
guard let result21 = ZDLookup(database21, latitude, longitude, &safezone) else {
return nil
}
return result21
}
/// Resolve timezone by coordinate and return timezone, country name and alpha2
public func lookup(latitude: Float, longitude: Float) -> SwiftTimeZoneLookupResult? {
guard let result = ZDLookup(database, latitude, longitude, nil) else {
guard let result = highResLookup(latitude: latitude, longitude: longitude) else {
return nil
}
defer { ZDFreeResults(result) }
@ -72,7 +98,7 @@ public final class SwiftTimeZoneLookup {
/// Resolve the timz
public func simple(latitude: Float, longitude: Float) -> String? {
guard let result = ZDLookup(database, latitude, longitude, nil) else {
guard let result = highResLookup(latitude: latitude, longitude: longitude) else {
return nil
}
defer { ZDFreeResults(result) }
@ -100,6 +126,6 @@ public final class SwiftTimeZoneLookup {
}
deinit {
ZDCloseDatabase(database)
ZDCloseDatabase(database21)
}
}

6
Tests/SwiftTimeZoneLookupTests/SwiftTimeZoneLookupTests.swift
View file

@ -1,5 +1,5 @@
import XCTest
@testable import SwiftTimeZoneLookup
import SwiftTimeZoneLookup
final class SwiftTimeZoneLookupTests: XCTestCase {
func testLookup() throws {
@ -13,5 +13,9 @@ final class SwiftTimeZoneLookupTests: XCTestCase {
XCTAssertEqual(database.lookup(latitude: 42.5, longitude: -8.6)?.countryName, "Spain")
XCTAssertEqual(database.lookup(latitude: 42.5, longitude: -8.6)?.countryAlpha2, "ES")
// on the border to the netherlands. Requires high resolution lookup
XCTAssertEqual(database.simple(latitude: 53.242293, longitude: 7.209253), "Europe/Berlin")
XCTAssertEqual(database.simple(latitude: 53.239692, longitude: 7.207879), "Europe/Amsterdam")
}
}