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