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// | |
// YapRTreeTest.swift | |
// YapDatabaseRTreeTest | |
// | |
// Created by Maël Primet on 06/19/15. | |
// Copyright (c) 2015 Snips. All rights reserved. | |
// | |
import Foundation | |
import YapDatabaseFramework | |
@objc | |
public class YapDB { | |
public static let sharedInstance: YapDB = YapDB() | |
public let db : YapDatabase | |
public let writeConnection: YapDatabaseConnection | |
public let readConnection: YapDatabaseConnection | |
public init() { | |
var paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true) | |
let dbFilename = paths[0].stringByAppendingPathComponent("database.ydb") | |
NSLog("Initialized database in path : %@", dbFilename) | |
self.db = YapDatabase(path: dbFilename) | |
self.writeConnection = self.db.newConnection() | |
self.readConnection = self.db.newConnection() | |
} | |
} | |
class LonlatObject: NSObject, NSCoding { | |
let name: String | |
let lon: Double | |
let lat: Double | |
init(name: String, lon: Double, lat: Double) { | |
self.name = name | |
self.lon = lon | |
self.lat = lat | |
} | |
required init(coder:NSCoder) { | |
self.name = coder.decodeObjectForKey("name") as! String | |
self.lon = coder.decodeDoubleForKey("lon") | |
self.lat = coder.decodeDoubleForKey("lat") | |
} | |
/* NSCoding */ | |
func encodeWithCoder(coder: NSCoder) { | |
coder.encodeObject(name, forKey: "name") | |
coder.encodeDouble(lon, forKey: "lon") | |
coder.encodeDouble(lat, forKey: "lat") | |
} | |
} | |
class RTreeTest { | |
static let indexName = "rTreeIndex" | |
static func run() { | |
RTreeTest.createIndex() | |
RTreeTest.writeObjects() | |
let items = RTreeTest.queryObjectsInBounds(minLon: 8, maxLon: 2, minLat: 4, maxLat: 8) | |
println(items.map({[$0.name, $0.lon, $0.lat]})) | |
} | |
private static func createIndex() { | |
let yapDb = YapDB.sharedInstance | |
let setup = YapDatabaseRTreeIndexSetup() | |
setup.setColumns(["minLon", "maxLon", "minLat", "maxLat"]) | |
let handler = YapDatabaseRTreeIndexHandler.withObjectBlock({ (d: NSMutableDictionary!, collection: String!, key: String!, object: AnyObject!) -> Void in | |
if let item = object as? LonlatObject { | |
d["minLon"] = item.lon | |
d["maxLon"] = item.lon | |
d["minLat"] = item.lat | |
d["maxLat"] = item.lat | |
} | |
}) | |
let ext = YapDatabaseRTreeIndex(setup: setup, handler: handler, versionTag: "1.0") | |
yapDb.db.registerExtension(ext, withName: RTreeTest.indexName) | |
self.nukeDatabase() | |
} | |
private static func nukeDatabase() { | |
let yapDb = YapDB.sharedInstance | |
var items = [] | |
yapDb.readConnection.readWriteWithBlock({ (transaction: YapDatabaseReadWriteTransaction) in | |
transaction.removeAllObjectsInCollection("lonlatObjects") | |
}) | |
} | |
private static func writeObjects() { | |
let yapDb = YapDB.sharedInstance | |
yapDb.writeConnection.readWriteWithBlock({ (transaction: YapDatabaseReadWriteTransaction) in | |
for i in (0..<10) { | |
for j in (0..<10) { | |
let item = LonlatObject(name: "grid-\(i)-\(j)", lon: Double(i), lat: Double(j)) | |
transaction.setObject(item, forKey: item.name, inCollection: "lonlatObjects") | |
} | |
} | |
}) | |
} | |
private static func queryObjectsInBounds(#minLon: Double, maxLon: Double, minLat: Double, maxLat: Double) -> [LonlatObject] { | |
let yapDb = YapDB.sharedInstance | |
var arguments: [CVarArgType] = [minLon, maxLon, minLat, maxLat].map({NSNumber(double: $0)}) // must be var to get a pointer, must be a NSObject to be formatted | |
let queryString = "WHERE minLon >= ? AND maxLon <= ? AND minLat >= ? AND maxLat <= ?" | |
let query = withVaList(arguments, { (pointer: CVaListPointer) -> YapDatabaseQuery in | |
return YapDatabaseQuery(format: queryString, arguments: pointer) | |
}) | |
var items: [LonlatObject] = [] | |
yapDb.readConnection.readWithBlock({ (transaction: YapDatabaseReadTransaction) in | |
if let index = transaction.ext("rTreeIndex") as? YapDatabaseRTreeIndexTransaction { | |
let enumerateBlock: (String!, String!, AnyObject!, UnsafeMutablePointer<ObjCBool>) -> Void = { | |
(collection: String!, key: String!, object: AnyObject!, stop: UnsafeMutablePointer<ObjCBool>) in | |
if let item = object as? LonlatObject { | |
items.append(item) | |
} | |
} | |
index.enumerateKeysAndObjectsMatchingQuery(query, usingBlock: enumerateBlock) | |
} | |
}) | |
return items | |
} | |
} |
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