baseline: OpenMU upstream b5a0961 (fresh source)

src/GameLogic/NullDropGenerator.cs

@@ -0,0 +1,43 @@
+// <copyright file="NullDropGenerator.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameLogic;
+
+/// <summary>
+/// A drop generator which generates nothing.
+/// </summary>
+public class NullDropGenerator : IDropGenerator
+{
+    private static IDropGenerator? _instance;
+
+    /// <summary>
+    /// Prevents a default instance of the <see cref="NullDropGenerator"/> class from being created.
+    /// </summary>
+    private NullDropGenerator()
+    {
+    }
+
+    /// <summary>
+    /// Gets the instance.
+    /// </summary>
+    public static IDropGenerator Instance => _instance ??= new NullDropGenerator();
+
+    /// <inheritdoc />
+    public ValueTask<(IEnumerable<Item> Items, uint? Money)> GenerateItemDropsAsync(MonsterDefinition monster, int gainedExperience, Player player)
+    {
+        return ValueTask.FromResult((Enumerable.Empty<Item>(), default(uint?)));
+    }
+
+    /// <inheritdoc />
+    public Item? GenerateItemDrop(DropItemGroup group)
+    {
+        return null;
+    }
+
+    /// <inheritdoc />
+    public (Item?, uint?, ItemDropEffect) GenerateItemDrop(IEnumerable<DropItemGroup> group)
+    {
+        return (null, null, ItemDropEffect.Undefined);
+    }
+}