Dactyloidae iOS initial commit

mobile/ios/Storage/DatabaseError.swift

@@ -0,0 +1,24 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import Shared
+
+/**
+ * Used to bridge the NSErrors we get here into something that Result is happy with.
+ */
+open class DatabaseError: MaybeErrorType {
+    let err: NSError?
+
+    open var description: String {
+        return err?.localizedDescription ?? "Unknown database error."
+    }
+
+    public init(description: String) {
+        self.err = NSError(domain: "mozilla", code: 0, userInfo: [NSLocalizedDescriptionKey: description])
+    }
+
+    public init(err: NSError?) {
+        self.err = err
+    }
+}