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using System;
using System.Reflection;
namespace StardewModdingAPI.Framework.Reflection
{
/// <summary>A field obtained through reflection.</summary>
/// <typeparam name="TValue">The field value type.</typeparam>
internal class ReflectedField<TValue> : IReflectedField<TValue>
{
/*********
** Fields
*********/
/// <summary>The type that has the field.</summary>
private readonly Type ParentType;
/// <summary>The object that has the instance field (if applicable).</summary>
private readonly object Parent;
/// <summary>The display name shown in error messages.</summary>
private string DisplayName => $"{this.ParentType.FullName}::{this.FieldInfo.Name}";
/*********
** Accessors
*********/
/// <inheritdoc />
public FieldInfo FieldInfo { get; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="parentType">The type that has the field.</param>
/// <param name="obj">The object that has the instance field (if applicable).</param>
/// <param name="field">The reflection metadata.</param>
/// <param name="isStatic">Whether the field is static.</param>
/// <exception cref="ArgumentNullException">The <paramref name="parentType"/> or <paramref name="field"/> is null.</exception>
/// <exception cref="ArgumentException">The <paramref name="obj"/> is null for a non-static field, or not null for a static field.</exception>
public ReflectedField(Type parentType, object obj, FieldInfo field, bool isStatic)
{
// validate
if (parentType == null)
throw new ArgumentNullException(nameof(parentType));
if (field == null)
throw new ArgumentNullException(nameof(field));
if (isStatic && obj != null)
throw new ArgumentException("A static field cannot have an object instance.");
if (!isStatic && obj == null)
throw new ArgumentException("A non-static field must have an object instance.");
// save
this.ParentType = parentType;
this.Parent = obj;
this.FieldInfo = field;
}
/// <inheritdoc />
public TValue GetValue()
{
try
{
return (TValue)this.FieldInfo.GetValue(this.Parent);
}
catch (InvalidCastException)
{
throw new InvalidCastException($"Can't convert the {this.DisplayName} field from {this.FieldInfo.FieldType.FullName} to {typeof(TValue).FullName}.");
}
catch (Exception ex)
{
throw new Exception($"Couldn't get the value of the {this.DisplayName} field", ex);
}
}
/// <inheritdoc />
public void SetValue(TValue value)
{
try
{
this.FieldInfo.SetValue(this.Parent, value);
}
catch (InvalidCastException)
{
throw new InvalidCastException($"Can't assign the {this.DisplayName} field a {typeof(TValue).FullName} value, must be compatible with {this.FieldInfo.FieldType.FullName}.");
}
catch (Exception ex)
{
throw new Exception($"Couldn't set the value of the {this.DisplayName} field", ex);
}
}
}
}
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