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using System;
using System.Reflection;
namespace StardewModdingAPI.Framework.Reflection
{
/// <summary>A property obtained through reflection.</summary>
/// <typeparam name="TValue">The property value type.</typeparam>
internal class ReflectedProperty<TValue> : IReflectedProperty<TValue>
{
/*********
** Fields
*********/
/// <summary>The display name shown in error messages.</summary>
private readonly string DisplayName;
/// <summary>The underlying property getter.</summary>
private readonly Func<TValue>? GetMethod;
/// <summary>The underlying property setter.</summary>
private readonly Action<TValue>? SetMethod;
/*********
** Accessors
*********/
/// <inheritdoc />
public PropertyInfo PropertyInfo { get; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="parentType">The type that has the property.</param>
/// <param name="obj">The object that has the instance property, or <c>null</c> for a static property.</param>
/// <param name="property">The reflection metadata.</param>
/// <param name="isStatic">Whether the property is static.</param>
/// <exception cref="ArgumentNullException">The <paramref name="parentType"/> or <paramref name="property"/> is null.</exception>
/// <exception cref="ArgumentException">The <paramref name="obj"/> is null for a non-static property, or not null for a static property.</exception>
public ReflectedProperty(Type parentType, object? obj, PropertyInfo property, bool isStatic)
{
// validate input
if (parentType == null)
throw new ArgumentNullException(nameof(parentType));
if (property == null)
throw new ArgumentNullException(nameof(property));
// validate static
if (isStatic && obj != null)
throw new ArgumentException("A static property cannot have an object instance.");
if (!isStatic && obj == null)
throw new ArgumentException("A non-static property must have an object instance.");
this.DisplayName = $"{parentType.FullName}::{property.Name}";
this.PropertyInfo = property;
if (this.PropertyInfo.GetMethod != null)
this.GetMethod = (Func<TValue>)Delegate.CreateDelegate(typeof(Func<TValue>), obj, this.PropertyInfo.GetMethod);
if (this.PropertyInfo.SetMethod != null)
this.SetMethod = (Action<TValue>)Delegate.CreateDelegate(typeof(Action<TValue>), obj, this.PropertyInfo.SetMethod);
}
/// <inheritdoc />
public TValue GetValue()
{
if (this.GetMethod == null)
throw new InvalidOperationException($"The {this.DisplayName} property has no get method.");
try
{
return this.GetMethod();
}
catch (InvalidCastException)
{
throw new InvalidCastException($"Can't convert the {this.DisplayName} property from {this.PropertyInfo.PropertyType.FullName} to {typeof(TValue).FullName}.");
}
catch (Exception ex)
{
throw new Exception($"Couldn't get the value of the {this.DisplayName} property", ex);
}
}
/// <inheritdoc />
public void SetValue(TValue value)
{
if (this.SetMethod == null)
throw new InvalidOperationException($"The {this.DisplayName} property has no set method.");
try
{
this.SetMethod(value);
}
catch (InvalidCastException)
{
throw new InvalidCastException($"Can't assign the {this.DisplayName} property a {typeof(TValue).FullName} value, must be compatible with {this.PropertyInfo.PropertyType.FullName}.");
}
catch (Exception ex)
{
throw new Exception($"Couldn't set the value of the {this.DisplayName} property", ex);
}
}
}
}
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