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using System;
namespace StardewModdingAPI.Framework.Content
{
/// <summary>Base implementation for a content helper which encapsulates access and changes to content being read from a data file.</summary>
/// <typeparam name="TValue">The interface value type.</typeparam>
internal class AssetData<TValue> : AssetInfo, IAssetData<TValue>
{
/*********
** Fields
*********/
/// <summary>A callback to invoke when the data is replaced (if any).</summary>
private readonly Action<TValue> OnDataReplaced;
/*********
** Accessors
*********/
/// <summary>The content data being read.</summary>
public TValue Data { get; protected set; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="locale">The content's locale code, if the content is localised.</param>
/// <param name="assetName">The normalised asset name being read.</param>
/// <param name="data">The content data being read.</param>
/// <param name="getNormalisedPath">Normalises an asset key to match the cache key.</param>
/// <param name="onDataReplaced">A callback to invoke when the data is replaced (if any).</param>
public AssetData(string locale, string assetName, TValue data, Func<string, string> getNormalisedPath, Action<TValue> onDataReplaced)
: base(locale, assetName, data.GetType(), getNormalisedPath)
{
this.Data = data;
this.OnDataReplaced = onDataReplaced;
}
/// <summary>Replace the entire content value with the given value. This is generally not recommended, since it may break compatibility with other mods or different versions of the game.</summary>
/// <param name="value">The new content value.</param>
/// <exception cref="ArgumentNullException">The <paramref name="value"/> is null.</exception>
/// <exception cref="InvalidCastException">The <paramref name="value"/>'s type is not compatible with the loaded asset's type.</exception>
public void ReplaceWith(TValue value)
{
if (value == null)
throw new ArgumentNullException(nameof(value), "Can't set a loaded asset to a null value.");
if (!this.DataType.IsInstanceOfType(value))
throw new InvalidCastException($"Can't replace loaded asset of type {this.GetFriendlyTypeName(this.DataType)} with value of type {this.GetFriendlyTypeName(value.GetType())}. The new type must be compatible to prevent game errors.");
this.Data = value;
this.OnDataReplaced?.Invoke(value);
}
}
}
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