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using System;
using System.Reflection;
using UnityEngine;
namespace IPA.Utilities
{
/// <summary>
/// A utility class providing reflection helper methods.
/// </summary>
public static class ReflectionUtil
{
/// <summary>
/// Sets a field on the target object.
/// </summary>
/// <param name="obj">the object instance</param>
/// <param name="fieldName">the field to set</param>
/// <param name="value">the value to set it to</param>
public static void SetField(this object obj, string fieldName, object value)
{
var prop = obj.GetType().GetField(fieldName, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
if (prop == null) throw new ArgumentException($"Field {fieldName} does not exist", nameof(fieldName));
prop?.SetValue(obj, value);
}
/// <summary>
/// Sets a field on the target object, as gotten from <typeparamref name="T"/>.
/// </summary>
/// <typeparam name="T">the type to get the field from</typeparam>
/// <param name="obj">the object instance</param>
/// <param name="fieldName">the field to set</param>
/// <param name="value">the value to set it to</param>
public static void SetField<T>(this T obj, string fieldName, object value) where T : class
{
var prop = typeof(T).GetField(fieldName, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
if (prop == null) throw new ArgumentException($"Field {fieldName} does not exist", nameof(fieldName));
prop?.SetValue(obj, value);
}
/// <summary>
/// Gets the value of a field.
/// </summary>
/// <typeparam name="T">the type of the field (result casted)</typeparam>
/// <param name="obj">the object instance to pull from</param>
/// <param name="fieldName">the name of the field to read</param>
/// <returns>the value of the field</returns>
public static T GetField<T>(this object obj, string fieldName)
{
var prop = obj.GetType().GetField(fieldName, BindingFlags.NonPublic | BindingFlags.Instance);
if (prop == null) throw new ArgumentException($"Field {fieldName} does not exist", nameof(fieldName));
var value = prop?.GetValue(obj);
return (T) value;
}
/// <summary>
/// Sets a property on the target object.
/// </summary>
/// <param name="obj">the target object instance</param>
/// <param name="propertyName">the name of the property</param>
/// <param name="value">the value to set it to</param>
public static void SetProperty(this object obj, string propertyName, object value)
{
var prop = obj.GetType().GetProperty(propertyName, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
if (prop == null) throw new ArgumentException($"Property {propertyName} does not exist", nameof(propertyName));
prop?.SetValue(obj, value, null);
}
/// <summary>
/// Sets a property on the target object, as gotten from <typeparamref name="T"/>
/// </summary>
/// <typeparam name="T">the type to get the property from</typeparam>
/// <param name="obj">the object instance</param>
/// <param name="propertyName">the property to set</param>
/// <param name="value">the value to set it to</param>
public static void SetProperty<T>(this T obj, string propertyName, object value) where T : class
{
var prop = typeof(T).GetProperty(propertyName, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
if (prop == null) throw new ArgumentException($"Property {propertyName} does not exist", nameof(propertyName));
prop?.SetValue(obj, value, null);
}
/// <summary>
/// Invokes a method on an object.
/// </summary>
/// <param name="obj">the object to call from</param>
/// <param name="methodName">the method name</param>
/// <param name="methodArgs">the method arguments</param>
/// <returns>the return value</returns>
public static object InvokeMethod(this object obj, string methodName, params object[] methodArgs)
{
MethodInfo dynMethod = obj.GetType().GetMethod(methodName, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
if (dynMethod == null) throw new ArgumentException($"Method {methodName} does not exist", nameof(methodName));
return dynMethod?.Invoke(obj, methodArgs);
}
/// <summary>
/// Invokes a method from <typeparamref name="T"/> on an object.
/// </summary>
/// <typeparam name="T">the type to search for the method on</typeparam>
/// <param name="obj">the object instance</param>
/// <param name="methodName">the method's name</param>
/// <param name="args">the method arguments</param>
/// <returns>the return value</returns>
public static object InvokeMethod<T>(this T obj, string methodName, params object[] args) where T : class
{
var dynMethod = typeof(T).GetMethod(methodName, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
if (dynMethod == null) throw new ArgumentException($"Method {methodName} does not exist", nameof(methodName));
return dynMethod?.Invoke(obj, args);
}
/// <summary>
/// Invokes a method.
/// </summary>
/// <typeparam name="T">the return type</typeparam>
/// <param name="obj">the object instance</param>
/// <param name="methodName">the method name to call</param>
/// <param name="methodArgs">the method's arguments</param>
/// <returns>the return value</returns>
public static T InvokeMethod<T>(this object obj, string methodName, params object[] methodArgs)
{
return (T)InvokeMethod(obj, methodName, methodArgs);
}
/// <summary>
/// Invokes a method from <typeparamref name="U"/> on an object.
/// </summary>
/// <typeparam name="T">the return type</typeparam>
/// <typeparam name="U">the type to search for the method on</typeparam>
/// <param name="obj">the object instance</param>
/// <param name="methodName">the method name to call</param>
/// <param name="methodArgs">the method's arguments</param>
/// <returns>the return value</returns>
public static T InvokeMethod<T, U>(this U obj, string methodName, params object[] methodArgs) where U : class
{
return (T)obj.InvokeMethod(methodName, methodArgs);
}
/// <summary>
/// Copies a component <paramref name="original"/> to a component of <paramref name="overridingType"/> on the destination <see cref="GameObject"/>.
/// </summary>
/// <param name="original">the original component</param>
/// <param name="overridingType">the new component's type</param>
/// <param name="destination">the destination GameObject</param>
/// <param name="originalTypeOverride">overrides the source component type (for example, to a superclass)</param>
/// <returns>the copied component</returns>
public static Component CopyComponent(this Component original, Type overridingType, GameObject destination, Type originalTypeOverride = null)
{
var copy = destination.AddComponent(overridingType);
var originalType = originalTypeOverride ?? original.GetType();
Type type = originalType;
while (type != typeof(MonoBehaviour))
{
CopyForType(type, original, copy);
type = type?.BaseType;
}
return copy;
}
/// <summary>
/// A generic version of <see cref="CopyComponent(Component, Type, GameObject, Type)"/>.
/// </summary>
/// <seealso cref="CopyComponent(Component, Type, GameObject, Type)"/>
/// <typeparam name="T">the overriding type</typeparam>
/// <param name="original">the original component</param>
/// <param name="destination">the destination game object</param>
/// <param name="originalTypeOverride">overrides the source component type (for example, to a superclass)</param>
/// <returns>the copied component</returns>
public static T CopyComponent<T>(this Component original, GameObject destination, Type originalTypeOverride = null)
where T : Component
{
var copy = destination.AddComponent<T>();
var originalType = originalTypeOverride ?? original.GetType();
Type type = originalType;
while (type != typeof(MonoBehaviour))
{
CopyForType(type, original, copy);
type = type?.BaseType;
}
return copy;
}
private static void CopyForType(Type type, Component source, Component destination)
{
FieldInfo[] myObjectFields = type.GetFields(BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
foreach (FieldInfo fi in myObjectFields)
{
fi.SetValue(destination, fi.GetValue(source));
}
}
}
}