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using System;
using System.Reflection;
namespace StardewModdingAPI.Framework.Reflection
{
/// <summary>A method obtained through reflection.</summary>
internal class ReflectedMethod : IReflectedMethod
{
/*********
** Fields
*********/
/// <summary>The type that has the method.</summary>
private readonly Type ParentType;
/// <summary>The object that has the instance method (if applicable).</summary>
private readonly object Parent;
/// <summary>The display name shown in error messages.</summary>
private string DisplayName => $"{this.ParentType.FullName}::{this.MethodInfo.Name}";
/*********
** Accessors
*********/
/// <summary>The reflection metadata.</summary>
public MethodInfo MethodInfo { get; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="parentType">The type that has the method.</param>
/// <param name="obj">The object that has the instance method(if applicable).</param>
/// <param name="method">The reflection metadata.</param>
/// <param name="isStatic">Whether the method is static.</param>
/// <exception cref="ArgumentNullException">The <paramref name="parentType"/> or <paramref name="method"/> is null.</exception>
/// <exception cref="ArgumentException">The <paramref name="obj"/> is null for a non-static method, or not null for a static method.</exception>
public ReflectedMethod(Type parentType, object obj, MethodInfo method, bool isStatic)
{
// validate
if (parentType == null)
throw new ArgumentNullException(nameof(parentType));
if (method == null)
throw new ArgumentNullException(nameof(method));
if (isStatic && obj != null)
throw new ArgumentException("A static method cannot have an object instance.");
if (!isStatic && obj == null)
throw new ArgumentException("A non-static method must have an object instance.");
// save
this.ParentType = parentType;
this.Parent = obj;
this.MethodInfo = method;
}
/// <summary>Invoke the method.</summary>
/// <typeparam name="TValue">The return type.</typeparam>
/// <param name="arguments">The method arguments to pass in.</param>
public TValue Invoke<TValue>(params object[] arguments)
{
// invoke method
object result;
try
{
result = this.MethodInfo.Invoke(this.Parent, arguments);
}
catch (TargetParameterCountException)
{
throw new Exception($"Couldn't invoke the {this.DisplayName} method: it expects {this.MethodInfo.GetParameters().Length} parameters, but {arguments.Length} were provided.");
}
catch (Exception ex)
{
throw new Exception($"Couldn't invoke the {this.DisplayName} method", ex);
}
// cast return value
try
{
return (TValue)result;
}
catch (InvalidCastException)
{
throw new InvalidCastException($"Can't convert the return value of the {this.DisplayName} method from {this.MethodInfo.ReturnType.FullName} to {typeof(TValue).FullName}.");
}
}
/// <summary>Invoke the method.</summary>
/// <param name="arguments">The method arguments to pass in.</param>
public void Invoke(params object[] arguments)
{
// invoke method
try
{
this.MethodInfo.Invoke(this.Parent, arguments);
}
catch (Exception ex)
{
throw new Exception($"Couldn't invoke the {this.DisplayName} method", ex);
}
}
}
}
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