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using System;
using System.Collections;
using System.Collections.Generic;
namespace StardewModdingAPI.Framework.Utilities
{
/// <summary>A <see cref="HashSet{T}"/> wrapper meant for tracking recursive contexts.</summary>
/// <typeparam name="T">The key type.</typeparam>
internal class ContextHash<T> : HashSet<T>
{
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
public ContextHash() { }
/// <summary>Construct an instance.</summary>
/// <param name="comparer">The <see cref="IEqualityComparer{T}"/> implementation to use when comparing values in the set, or <c>null</c> to use the default comparer for the set type.</param>
public ContextHash(IEqualityComparer<T> comparer)
: base(comparer) { }
/// <summary>Add a key while an action is in progress, and remove it when it completes.</summary>
/// <param name="key">The key to add.</param>
/// <param name="action">The action to perform.</param>
/// <exception cref="InvalidOperationException">The specified key is already added.</exception>
public void Track(T key, Action action)
{
if(this.Contains(key))
throw new InvalidOperationException($"Can't track context for key {key} because it's already added.");
this.Add(key);
try
{
action();
}
finally
{
this.Remove(key);
}
}
/// <summary>Add a key while an action is in progress, and remove it when it completes.</summary>
/// <typeparam name="TResult">The value type returned by the method.</typeparam>
/// <param name="key">The key to add.</param>
/// <param name="action">The action to perform.</param>
public TResult Track<TResult>(T key, Func<TResult> action)
{
if (this.Contains(key))
throw new InvalidOperationException($"Can't track context for key {key} because it's already added.");
this.Add(key);
try
{
return action();
}
finally
{
this.Remove(key);
}
}
}
}
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