Initial commit

Assets/YooAsset/Runtime/AssetSystem/Provider/DatabaseAssetProvider.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace YooAsset
+{
+	internal sealed class DatabaseAssetProvider : AssetProviderBase
+	{
+		public override float Progress
+		{
+			get
+			{
+				if (IsDone)
+					return 100f;
+				else
+					return 0;
+			}
+		}
+
+		public DatabaseAssetProvider(string assetPath, System.Type assetType)
+			: base(assetPath, assetType)
+		{
+		}
+		public override void Update()
+		{
+#if UNITY_EDITOR
+			if (IsDone)
+				return;
+
+			if (States == EAssetStates.None)
+			{
+				// 检测资源文件是否存在
+				string guid = UnityEditor.AssetDatabase.AssetPathToGUID(AssetPath);
+				if (string.IsNullOrEmpty(guid))
+				{
+					States = EAssetStates.Fail;
+					InvokeCompletion();
+					return;
+				}
+				else
+				{
+					States = EAssetStates.Loading;
+				}
+			
+				// 注意：模拟异步加载效果提前返回
+				if (IsWaitForAsyncComplete == false)
+					return;
+			}
+
+			// 1. 加载资源对象
+			if (States == EAssetStates.Loading)
+			{
+				AssetObject = UnityEditor.AssetDatabase.LoadAssetAtPath(AssetPath, AssetType);
+				States = EAssetStates.Checking;
+			}
+
+			// 2. 检测加载结果
+			if (States == EAssetStates.Checking)
+			{
+				States = AssetObject == null ? EAssetStates.Fail : EAssetStates.Success;
+				if (States == EAssetStates.Fail)
+					Logger.Warning($"Failed to load asset object : {AssetPath}");
+				InvokeCompletion();
+			}
+#endif
+		}
+	}
+}