summaryrefslogtreecommitdiff
path: root/src/SMAPI/Framework/StateTracking/FieldWatchers/ImmutableCollectionWatcher.cs
blob: 84340fbfe5b04737900350525e1ecea3f9101f81 (plain)
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
using System;
using System.Collections.Generic;

namespace StardewModdingAPI.Framework.StateTracking.FieldWatchers
{
    /// <summary>A collection watcher which never changes.</summary>
    /// <typeparam name="TValue">The value type within the collection.</typeparam>
    internal class ImmutableCollectionWatcher<TValue> : BaseDisposableWatcher, ICollectionWatcher<TValue>
    {
        /*********
        ** Accessors
        *********/
        /// <summary>A singleton collection watcher instance.</summary>
        public static ImmutableCollectionWatcher<TValue> Instance { get; } = new();

        /// <summary>Whether the collection changed since the last reset.</summary>
        public bool IsChanged { get; } = false;

        /// <summary>The values added since the last reset.</summary>
        public IEnumerable<TValue> Added { get; } = Array.Empty<TValue>();

        /// <summary>The values removed since the last reset.</summary>
        public IEnumerable<TValue> Removed { get; } = Array.Empty<TValue>();


        /*********
        ** Public methods
        *********/
        /// <summary>Update the current value if needed.</summary>
        public void Update() { }

        /// <summary>Set the current value as the baseline.</summary>
        public void Reset() { }

        /// <summary>Stop watching the field and release all references.</summary>
        public override void Dispose() { }
    }
}