forked from BilalY/Rasagar
242 lines
10 KiB
C#
242 lines
10 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Text;
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namespace Cinemachine.Utility
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{
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/// <summary>An ad-hoc collection of helpers for reflection, used by Cinemachine
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/// or its editor tools in various places</summary>
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[DocumentationSorting(DocumentationSortingAttribute.Level.Undoc)]
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public static class ReflectionHelpers
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{
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/// <summary>Copy the fields from one object to another</summary>
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/// <param name="src">The source object to copy from</param>
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/// <param name="dst">The destination object to copy to</param>
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/// <param name="bindingAttr">The mask to filter the attributes.
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/// Only those fields that get caught in the filter will be copied</param>
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public static void CopyFields(
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System.Object src, System.Object dst,
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System.Reflection.BindingFlags bindingAttr
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= System.Reflection.BindingFlags.Public
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| System.Reflection.BindingFlags.NonPublic
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| System.Reflection.BindingFlags.Instance)
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{
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if (src != null && dst != null)
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{
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Type type = src.GetType();
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FieldInfo[] fields = type.GetFields(bindingAttr);
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for (int i = 0; i < fields.Length; ++i)
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if (!fields[i].IsStatic)
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fields[i].SetValue(dst, fields[i].GetValue(src));
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}
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}
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/// <summary>Search the assembly for all types that match a predicate</summary>
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/// <param name="assembly">The assembly to search</param>
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/// <param name="predicate">The type to look for</param>
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/// <returns>A list of types found in the assembly that inherit from the predicate</returns>
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public static IEnumerable<Type> GetTypesInAssembly(
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Assembly assembly, Predicate<Type> predicate)
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{
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if (assembly == null)
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return null;
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Type[] types = new Type[0];
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try
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{
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types = assembly.GetTypes();
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}
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catch (Exception)
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{
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// Can't load the types in this assembly
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}
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types = (from t in types
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where t != null && predicate(t)
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select t).ToArray();
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return types;
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}
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/// <summary>Get a type from a name</summary>
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/// <param name="typeName">The name of the type to search for</param>
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/// <returns>The type matching the name, or null if not found</returns>
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public static Type GetTypeInAllDependentAssemblies(string typeName)
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{
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foreach (Type type in GetTypesInAllDependentAssemblies(t => t.Name == typeName))
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return type;
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return null;
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}
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/// <summary>Search all assemblies for all types that match a predicate</summary>
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/// <param name="predicate">The type to look for</param>
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/// <returns>A list of types found in the assembly that inherit from the predicate</returns>
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public static IEnumerable<Type> GetTypesInAllDependentAssemblies(Predicate<Type> predicate)
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{
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List<Type> foundTypes = new List<Type>(100);
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Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
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string definedIn = typeof(CinemachineComponentBase).Assembly.GetName().Name;
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foreach (Assembly assembly in assemblies)
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{
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// Note that we have to call GetName().Name. Just GetName() will not work.
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if ((!assembly.GlobalAssemblyCache)
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&& ((assembly.GetName().Name == definedIn)
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|| assembly.GetReferencedAssemblies().Any(a => a.Name == definedIn)))
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try
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{
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foreach (Type foundType in GetTypesInAssembly(assembly, predicate))
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foundTypes.Add(foundType);
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}
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catch (Exception) {} // Just skip uncooperative assemblies
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}
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return foundTypes;
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}
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#if false
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/// <summary>call GetTypesInAssembly() for all assemblies that match a predicate</summary>
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/// <param name="assemblyPredicate">Which assemblies to search</param>
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/// <param name="predicate">What type to look for</param>
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public static IEnumerable<Type> GetTypesInLoadedAssemblies(
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Predicate<Assembly> assemblyPredicate, Predicate<Type> predicate)
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{
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Assembly[] assemblies = System.AppDomain.CurrentDomain.GetAssemblies();
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assemblies = assemblies.Where((Assembly assembly)
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=> { return assemblyPredicate(assembly); }).OrderBy((Assembly ass)
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=> { return ass.FullName; }).ToArray();
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List<Type> foundTypes = new List<Type>(100);
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foreach (Assembly assembly in assemblies)
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{
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foreach (Type foundType in GetTypesInAssembly(assembly, predicate))
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foundTypes.Add(foundType);
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}
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return foundTypes;
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}
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/// <summary>Is a type defined and visible</summary>
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/// <param name="fullname">Fullly-qualified type name</param>
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/// <returns>true if the type exists</returns>
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public static bool TypeIsDefined(string fullname)
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{
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Assembly[] assemblies = AppDomain.CurrentDomain.GetAssemblies();
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foreach (Assembly assembly in assemblies)
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{
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try
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{
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foreach (var type in assembly.GetTypes())
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if (type.FullName == fullname)
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return true;
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}
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catch (System.Exception) {} // Just skip uncooperative assemblies
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}
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return false;
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}
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#endif
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/// <summary>Cheater extension to access internal field of an object</summary>
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/// <typeparam name="T">The field type</typeparam>
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/// <param name="type">The type of the field</param>
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/// <param name="obj">The object to access</param>
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/// <param name="memberName">The string name of the field to access</param>
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/// <returns>The value of the field in the objects</returns>
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public static T AccessInternalField<T>(this Type type, object obj, string memberName)
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{
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if (string.IsNullOrEmpty(memberName) || (type == null))
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return default(T);
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System.Reflection.BindingFlags bindingFlags = System.Reflection.BindingFlags.NonPublic;
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if (obj != null)
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bindingFlags |= System.Reflection.BindingFlags.Instance;
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else
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bindingFlags |= System.Reflection.BindingFlags.Static;
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FieldInfo field = type.GetField(memberName, bindingFlags);
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if ((field != null) && (field.FieldType == typeof(T)))
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return (T)field.GetValue(obj);
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else
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return default(T);
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}
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#if false
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/// <summary>Cheater extension to access internal property of an object</summary>
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/// <typeparam name="T">The field type</typeparam>
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/// <param name="type">The type of the field</param>
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/// <param name="obj">The object to access</param>
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/// <param name="memberName">The string name of the field to access</param>
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/// <returns>The value of the field in the objects</returns>
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public static T AccessInternalProperty<T>(this Type type, object obj, string memberName)
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{
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if (string.IsNullOrEmpty(memberName) || (type == null))
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return default(T);
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System.Reflection.BindingFlags bindingFlags = System.Reflection.BindingFlags.NonPublic;
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if (obj != null)
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bindingFlags |= System.Reflection.BindingFlags.Instance;
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else
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bindingFlags |= System.Reflection.BindingFlags.Static;
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PropertyInfo pi = type.GetProperty(memberName, bindingFlags);
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if ((pi != null) && (pi.PropertyType == typeof(T)))
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return (T)pi.GetValue(obj, null);
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else
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return default(T);
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}
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#endif
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/// <summary>Get the object owner of a field. This method processes
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/// the '.' separator to get from the object that owns the compound field
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/// to the object that owns the leaf field</summary>
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/// <param name="path">The name of the field, which may contain '.' separators</param>
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/// <param name="obj">the owner of the compound field</param>
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/// <returns>The object owner of the field</returns>
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public static object GetParentObject(string path, object obj)
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{
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var fields = path.Split('.');
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if (fields.Length == 1)
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return obj;
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var info = obj.GetType().GetField(
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fields[0], System.Reflection.BindingFlags.Public
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| System.Reflection.BindingFlags.NonPublic
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| System.Reflection.BindingFlags.Instance);
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obj = info.GetValue(obj);
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return GetParentObject(string.Join(".", fields, 1, fields.Length - 1), obj);
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}
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/// <summary>Returns a string path from an expression - mostly used to retrieve serialized properties
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/// without hardcoding the field path. Safer, and allows for proper refactoring.</summary>
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/// <typeparam name="TType">Magic expression</typeparam>
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/// <typeparam name="TValue">Magic expression</typeparam>
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/// <param name="expr">Magic expression</param>
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/// <returns>The string version of the field path</returns>
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public static string GetFieldPath<TType, TValue>(Expression<Func<TType, TValue>> expr)
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{
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MemberExpression me;
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switch (expr.Body.NodeType)
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{
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case ExpressionType.MemberAccess:
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me = expr.Body as MemberExpression;
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break;
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default:
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throw new InvalidOperationException();
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}
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var members = new List<string>();
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while (me != null)
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{
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members.Add(me.Member.Name);
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me = me.Expression as MemberExpression;
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}
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var sb = new StringBuilder();
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for (int i = members.Count - 1; i >= 0; i--)
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{
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sb.Append(members[i]);
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if (i > 0) sb.Append('.');
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}
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return sb.ToString();
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}
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}
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}
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