86 lines
2.4 KiB
C#
86 lines
2.4 KiB
C#
using System.IO;
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using System.Linq;
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using JetBrains.Annotations;
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using UnityEditorInternal;
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using UnityEngine;
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using UnityEngine.Assertions;
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namespace Unity.Tutorials.Core.Editor
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{
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internal class ScriptableObjectSingleton<T> : ScriptableObject where T : ScriptableObject
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{
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static T s_Instance;
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public static T Instance
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{
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get
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{
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if (s_Instance == null)
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CreateAndLoad();
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return s_Instance;
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}
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}
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protected ScriptableObjectSingleton()
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{
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if (s_Instance != null)
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{
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Debug.LogError("Singleton already exists!");
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}
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else
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{
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s_Instance = this as T;
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Assert.IsFalse(s_Instance == null);
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}
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}
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static void CreateAndLoad()
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{
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Assert.IsTrue(s_Instance == null);
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var filePath = GetFilePath();
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if (!string.IsNullOrEmpty(filePath) && File.Exists(filePath))
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{
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InternalEditorUtility.LoadSerializedFileAndForget(filePath);
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}
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if (s_Instance == null)
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{
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var inst = CreateInstance<T>() as ScriptableObjectSingleton<T>;
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Assert.IsFalse(inst == null);
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inst.hideFlags = HideFlags.HideAndDontSave;
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inst.Save();
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}
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Assert.IsFalse(s_Instance == null);
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}
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protected void Save()
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{
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if (s_Instance == null)
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{
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Debug.LogError("Cannot save singleton, no instance!");
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return;
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}
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var locationFilePath = GetFilePath();
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var directoryName = Path.GetDirectoryName(locationFilePath);
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if (directoryName == null)
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{
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Debug.LogError($"Could not save cache because target directory for the save file is empty");
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return;
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}
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Directory.CreateDirectory(directoryName);
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InternalEditorUtility.SaveToSerializedFileAndForget(new Object[] { s_Instance }, locationFilePath, true);
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}
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[CanBeNull]
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static string GetFilePath()
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{
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var attr = typeof(T).GetCustomAttributes(true)
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.OfType<LocationAttribute>()
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.FirstOrDefault();
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return attr?.FilePath;
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}
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}
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}
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