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