[TASK] Initial commit with basic product setup

Assets/Mapbox SDK/Mapbox/Unity/Utilities/Singleton.cs

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+/**
+* Copyright 2015 IBM Corp. All Rights Reserved.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*      http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*
+*/
+
+//#define SINGLETONS_VISIBLE
+
+namespace Mapbox.Unity.Utilities {
+
+	using UnityEngine;
+	using System;
+#if NETFX_CORE
+	using System.Reflection;
+#endif
+
+	/// <summary>
+	/// Singleton pattern class. This class detects if T is a MonoBehavior and will 
+	/// make a containing GameObject.  
+	/// </summary>
+	/// <typeparam name="T">The typename of the class to create as a singleton object.</typeparam>
+	/// <remarks>An instance of this class needs to be of type <c>UnityEngine.Object</c> As long as this is used with UnityEngine classes, this should work fine. This is to resolve issue #116 <see href="https://github.com/mapbox/mapbox-unity-sdk/issues/116"/>	</remarks>
+	public class Singleton<T> where T : UnityEngine.Object {
+		#region Private Data
+		static private T sm_Instance = null;
+		#endregion
+
+		#region Public Properties
+		/// <summary>
+		/// Returns the Singleton instance of T.
+		/// </summary>
+		public static T Instance {
+			get {
+				if (sm_Instance == null)
+					CreateInstance();
+				return sm_Instance;
+			}
+		}
+		#endregion
+
+		#region Singleton Creation
+		/// <summary>
+		/// Create the singleton instance.
+		/// </summary>
+		private static void CreateInstance() {
+#if NETFX_CORE
+            if (typeof(MonoBehaviour).GetTypeInfo().IsAssignableFrom(typeof(T).GetTypeInfo())) {
+#else
+			if (typeof(MonoBehaviour).IsAssignableFrom(typeof(T))) {
+#endif
+				string singletonName = "_" + typeof(T).Name;
+
+				GameObject singletonObject = GameObject.Find(singletonName);
+				if (singletonObject == null)
+					singletonObject = new GameObject(singletonName);
+#if SINGLETONS_VISIBLE
+                singletonObject.hideFlags = HideFlags.DontSave;
+#else
+				singletonObject.hideFlags = HideFlags.HideAndDontSave;
+#endif
+				sm_Instance = singletonObject.GetComponent<T>();
+				if (sm_Instance == null)
+					sm_Instance = singletonObject.AddComponent(typeof(T)) as T;
+			} else {
+				sm_Instance = Activator.CreateInstance(typeof(T)) as T;
+			}
+
+			if (sm_Instance == null)
+				throw new Exception("Failed to create instance " + typeof(T).Name);
+		}
+		#endregion
+	}
+}