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using System.Collections.Generic;
using StardewModdingAPI.Framework.StateTracking;
namespace StardewModdingAPI.Framework
{
/// <summary>A snapshot of a tracked list.</summary>
/// <typeparam name="T">The tracked list value type.</typeparam>
internal class SnapshotListDiff<T>
{
/*********
** Fields
*********/
/// <summary>The removed values.</summary>
private readonly List<T> RemovedImpl = new();
/// <summary>The added values.</summary>
private readonly List<T> AddedImpl = new();
/*********
** Accessors
*********/
/// <summary>Whether the value changed since the last update.</summary>
public bool IsChanged { get; private set; }
/// <summary>The removed values.</summary>
public IEnumerable<T> Removed => this.RemovedImpl;
/// <summary>The added values.</summary>
public IEnumerable<T> Added => this.AddedImpl;
/*********
** Public methods
*********/
/// <summary>Update the snapshot.</summary>
/// <param name="isChanged">Whether the value changed since the last update.</param>
/// <param name="removed">The removed values.</param>
/// <param name="added">The added values.</param>
public void Update(bool isChanged, IEnumerable<T>? removed, IEnumerable<T>? added)
{
this.IsChanged = isChanged;
this.RemovedImpl.Clear();
if (removed != null)
this.RemovedImpl.AddRange(removed);
this.AddedImpl.Clear();
if (added != null)
this.AddedImpl.AddRange(added);
}
/// <summary>Update the snapshot.</summary>
/// <param name="watcher">The value watcher to snapshot.</param>
public void Update(ICollectionWatcher<T> watcher)
{
this.Update(watcher.IsChanged, watcher.Removed, watcher.Added);
}
}
}
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