HMCharacteristics promises

Author: ChrisChares

PMKHomeKit.xcodeproj/project.pbxproj

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+				838C29D02103FB9700CE5309 /* HMCharacteristic+Promise.swift */,
+				838C29CE2103FB9600CE5309 /* HMAcessoryBrowser+Promise.swift */,
+				838C29CF2103FB9700CE5309 /* HMHome+Promise.swift */,
+				838C29D12103FB9700CE5309 /* HMHomeManager+Promise.swift */,
+				838C29D22103FB9700CE5309 /* PromiseProxy.swift */,
 				6358AB791D5D4B6700B9B157 /* PMKCoreLocation.h */,
 				63199F061D5FF25C007E8A0E /* CLGeocoder+AnyPromise.h */,
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+				838C29D62103FB9700CE5309 /* HMHomeManager+Promise.swift in Sources */,
+				838C29D52103FB9700CE5309 /* HMCharacteristic+Promise.swift in Sources */,
+				838C29D42103FB9700CE5309 /* HMHome+Promise.swift in Sources */,
+				838C29D32103FB9700CE5309 /* HMAcessoryBrowser+Promise.swift in Sources */,
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Sources/HMCharacteristic+Promise.swift

@@ -0,0 +1,51 @@
+//
+//  HMAccessory+Promise.swift
+//  Onboarding
+//
+//  Created by Chris Chares on 7/12/18.
+//  Copyright © 2018 Hunter Douglas. All rights reserved.
+//
+
+import Foundation
+import HomeKit
+import PromiseKit
+
+public enum AccessoryError: Error {
+    case incorrectType
+    case serviceMissing
+    case characteristicMissing
+}
+
+extension HMCharacteristic {
+    /**
+        A simple typesafe promise wrapper around readValue
+    */
+    public func read<T>() -> Promise<T> {
+        return Promise { seal in
+            self.readValue { error in
+                if let error = error { seal.reject(error) }
+                else if let value = self.value as? T { seal.fulfill(value) }
+                else { seal.reject(AccessoryError.incorrectType) }
+            }
+        }
+    }
+    /// Because type inference is great... until you can't compile (thanks Swift)
+    public func readFloat() -> Promise<Float> { return read() }
+    public func readDouble() -> Promise<Double> { return read() }
+    public func readInt() -> Promise<Int> { return read() }
+    public func readString() -> Promise<String> { return read() }
+    
+    /**
+        A simple promise wrapper around writeValue
+    */
+    public func write(_ value: Any?) -> Promise<Void> {
+        return Promise { seal in
+            self.writeValue(value, completionHandler: seal.resolve)
+        }
+    }
+    /// Explicit is good
+    public func writeFloat(_ value: Float) -> Promise<Void> { return write(value) }
+    public func writeDouble(_ value: Double) -> Promise<Void> { return write(value) }
+    public func writeInt(_ value: Int) -> Promise<Void> { return write(value) }
+    public func writeString(_ value: String) -> Promise<Void> { return write(value) }
+}