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Created by
Bjarke Elias
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 | using System.Linq;
using UnityEngine;
using Sirenix.Utilities;
using System;
using System.IO;
#if UNITY_EDITOR
using UnityEditor;
#endif
[AttributeUsage(AttributeTargets.Class, AllowMultiple = true, Inherited = true)]
public class SingletonAssetPathAttribute : Attribute
{
public readonly string Path;
public SingletonAssetPathAttribute(string path)
{
this.Path = path;
}
}
public static class UnityObjectSingleton<T>
where T : UnityEngine.Object
{
private static readonly bool isBehaviour = typeof(Behaviour).IsAssignableFrom(typeof(T));
private static readonly bool isScriptableObject = typeof(ScriptableObject).IsAssignableFrom(typeof(T));
private static readonly SingletonAssetPathAttribute assetAttribute = typeof(T).GetAttribute<SingletonAssetPathAttribute>(true);
private static T instance;
public static T Instance
{
get
{
if (!instance)
{
instance = FindOrCreateInstance();
}
return instance;
}
}
public static void ForceSetInstance(T objInstance)
{
instance = objInstance;
}
private static T FindOrCreateInstance()
{
T tmp = null;
tmp = FindAssetInMemory();
if (tmp) return tmp;
#if UNITY_EDITOR
tmp = FindAssetInstance();
if (tmp) return tmp;
tmp = TryCreateAsset();
if (tmp) return tmp;
#endif
tmp = CreateNewInstanceInMemory();
if (tmp) return tmp;
if (tmp == null)
{
throw new Exception("Could not find or create a singleton instance of type " + typeof(T).GetNiceName());
}
return tmp;
}
private static T CreateNewInstanceInMemory()
{
if (isBehaviour)
{
var obj = new GameObject(typeof(T).Name, typeof(T)).GetComponent<T>();
obj.name = typeof(T).Name;
return obj;
}
else if (isScriptableObject)
{
return ScriptableObject.CreateInstance(typeof(T)) as T;
}
else
{
throw new NotImplementedException(typeof(T).FullName + " is neither a Component or a ScriptableObject.");
}
}
private static T FindAssetInMemory()
{
if (isBehaviour)
{
T obj = null;
// Active scene objects
obj = UnityEngine.Object.FindObjectOfType<T>();
if (obj) return obj;
// Inactive scene objects
obj = Resources
.FindObjectsOfTypeAll<T>()
.Where(x => (x as Behaviour).gameObject.scene.name != null)
.FirstOrDefault();
return obj;
}
else if (isScriptableObject)
{
return Resources.FindObjectsOfTypeAll<T>().FirstOrDefault();
}
else
{
throw new NotImplementedException(typeof(T).FullName + " is neither a Component or a ScriptableObject.");
}
}
private static string GetAssetPath(string path)
{
path = path.Replace('\\', '/').Trim('/');
if (!path.StartsWith("assets", StringComparison.InvariantCultureIgnoreCase))
{
path = "Assets/" + path;
}
path = path.Trim('/'); // if path was ""
if (string.IsNullOrEmpty(Path.GetExtension(path)))
{
string extension;
if (isBehaviour)
{
extension = "prefab";
}
else
{
extension = "asset";
}
path += "/" + typeof(T).Name + "." + extension;
}
return path;
}
#if UNITY_EDITOR
private static T TryCreateAsset()
{
if (assetAttribute == null)
{
return null;
}
var assetPath = GetAssetPath(assetAttribute.Path);
var folder = Path.GetDirectoryName(assetPath);
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
var name = Path.GetFileNameWithoutExtension(assetPath);
if (isBehaviour)
{
var tmp = new GameObject(name, typeof(T));
var prefab = PrefabUtility.CreatePrefab(assetPath, tmp);
UnityEngine.Object.DestroyImmediate(tmp);
return prefab.GetComponent<T>();
}
else
{
var tmp = ScriptableObject.CreateInstance(typeof(T));
tmp.name = name;
AssetDatabase.CreateAsset(tmp, assetPath);
return tmp as T;
}
}
private static T FindAssetInstance()
{
if (assetAttribute != null)
{
var assetPath = GetAssetPath(assetAttribute.Path);
if (isBehaviour)
{
var asset = AssetDatabase.LoadAssetAtPath(assetPath, typeof(GameObject));
if (asset)
{
var prefabInstance = (PrefabUtility.InstantiatePrefab(asset) as GameObject).GetComponent<T>();
prefabInstance.name = asset.name;
return prefabInstance;
}
else
{
// Not found.
return null;
}
}
else if (isScriptableObject)
{
var asset = AssetDatabase.LoadAssetAtPath<T>(assetPath);
if (asset)
{
return asset;
}
// The asset could have been moved to a diferent location.
var newAssetPath = AssetDatabase.FindAssets("t:" + (typeof(T).Name))
.Select(guid => AssetDatabase.GUIDToAssetPath(guid))
.FirstOrDefault();
if (newAssetPath != null)
{
asset = AssetDatabase.LoadAssetAtPath<T>(newAssetPath);
if (asset)
{
Debug.LogWarning("The singleton of type" + typeof(T).Name + " was expected to be found at: '" + assetPath + "', but was instead found at: '" + newAssetPath + "'");
return asset;
}
}
}
else
{
throw new NotSupportedException();
}
}
return null;
}
#endif
}
|
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