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using System.Collections.Generic;
using Netcode;
namespace StardewModdingAPI.Framework.StateTracking.FieldWatchers
{
/// <summary>A watcher which detects changes to a net dictionary field.</summary>
/// <typeparam name="TKey">The dictionary key type.</typeparam>
/// <typeparam name="TValue">The dictionary value type.</typeparam>
/// <typeparam name="TField">The net type equivalent to <typeparamref name="TValue"/>.</typeparam>
/// <typeparam name="TSerialDict">The serializable dictionary type that can store the keys and values.</typeparam>
/// <typeparam name="TSelf">The net field instance type.</typeparam>
internal class NetDictionaryWatcher<TKey, TValue, TField, TSerialDict, TSelf> : BaseDisposableWatcher, IDictionaryWatcher<TKey, TValue>
where TField : class, INetObject<INetSerializable>, new()
where TSerialDict : IDictionary<TKey, TValue>, new()
where TSelf : NetDictionary<TKey, TValue, TField, TSerialDict, TSelf>
{
/*********
** Fields
*********/
/// <summary>The pairs added since the last reset.</summary>
private readonly IDictionary<TKey, TValue> PairsAdded = new Dictionary<TKey, TValue>();
/// <summary>The pairs removed since the last reset.</summary>
private readonly IDictionary<TKey, TValue> PairsRemoved = new Dictionary<TKey, TValue>();
/// <summary>The field being watched.</summary>
private readonly NetDictionary<TKey, TValue, TField, TSerialDict, TSelf> Field;
/*********
** Accessors
*********/
/// <summary>Whether the collection changed since the last reset.</summary>
public bool IsChanged => this.PairsAdded.Count > 0 || this.PairsRemoved.Count > 0;
/// <summary>The values added since the last reset.</summary>
public IEnumerable<KeyValuePair<TKey, TValue>> Added => this.PairsAdded;
/// <summary>The values removed since the last reset.</summary>
public IEnumerable<KeyValuePair<TKey, TValue>> Removed => this.PairsRemoved;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="field">The field to watch.</param>
public NetDictionaryWatcher(NetDictionary<TKey, TValue, TField, TSerialDict, TSelf> field)
{
this.Field = field;
field.OnValueAdded += this.OnValueAdded;
field.OnValueRemoved += this.OnValueRemoved;
}
/// <summary>Update the current value if needed.</summary>
public void Update()
{
this.AssertNotDisposed();
}
/// <summary>Set the current value as the baseline.</summary>
public void Reset()
{
this.AssertNotDisposed();
this.PairsAdded.Clear();
this.PairsRemoved.Clear();
}
/// <summary>Stop watching the field and release all references.</summary>
public override void Dispose()
{
if (!this.IsDisposed)
{
this.Field.OnValueAdded -= this.OnValueAdded;
this.Field.OnValueRemoved -= this.OnValueRemoved;
}
base.Dispose();
}
/*********
** Private methods
*********/
/// <summary>A callback invoked when an entry is added to the dictionary.</summary>
/// <param name="key">The entry key.</param>
/// <param name="value">The entry value.</param>
private void OnValueAdded(TKey key, TValue value)
{
this.PairsAdded[key] = value;
}
/// <summary>A callback invoked when an entry is removed from the dictionary.</summary>
/// <param name="key">The entry key.</param>
/// <param name="value">The entry value.</param>
private void OnValueRemoved(TKey key, TValue value)
{
if (!this.PairsRemoved.ContainsKey(key))
this.PairsRemoved[key] = value;
}
}
}
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