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FreeSR/FreeSR.Shared/Command/CommandHandler.cs

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2024-01-27 13:06:07 +00:00
namespace FreeSR.Shared.Command
{
using FreeSR.Shared.Command.Context;
using FreeSR.Shared.Command.Convert;
using System.Linq.Expressions;
using System.Reflection;
public class CommandHandler
{
private Delegate _handlerDelegate;
private readonly List<ICommandParameterConverter> _additionalParameterConverters = new List<ICommandParameterConverter>();
public CommandHandler(Type type, MethodInfo method)
{
InitializeDelegate(type, method);
InitializeParameters(method);
}
private void InitializeDelegate(Type type, MethodInfo method)
{
ParameterInfo[] info = method.GetParameters();
if (info.Length < 1 || !typeof(ICommandContext).IsAssignableFrom(info[0].ParameterType))
throw new CommandException("");
ParameterExpression instance = Expression.Parameter(type);
var parameters = new List<ParameterExpression> { instance };
parameters.AddRange(info.Select(p => Expression.Parameter(p.ParameterType)));
MethodCallExpression call = Expression.Call(instance, method, parameters.Skip(1));
LambdaExpression lambda = Expression.Lambda(call, parameters);
_handlerDelegate = lambda.Compile();
}
private void InitializeParameters(MethodInfo method)
{
foreach (Type parameterType in method.GetParameters()
.Skip(1)
.Select(p => p.ParameterType))
{
ICommandParameterConverter converter = CommandManager.Instance.GetConverter(parameterType);
if (converter == null)
throw new CommandException("");
_additionalParameterConverters.Add(converter);
}
}
public CommandResult Invoke(ICommandCategory category, ICommandContext context, string[] parameters, uint depth)
{
var additionalParameterCount = parameters.Length - depth;
if (additionalParameterCount < _additionalParameterConverters.Count)
return CommandResult.Parameter;
var parameterObjects = new List<object> { category, context };
for (int i = 0; i < _additionalParameterConverters.Count; i++)
{
if (!_additionalParameterConverters[i].TryConvert(parameters[depth + i], out object result))
return CommandResult.Parameter;
parameterObjects.Add(result);
}
_handlerDelegate.DynamicInvoke(parameterObjects.ToArray());
return CommandResult.Ok;
}
}
}