From 929dccb75a1405737975d76648e015a3e7c00177 Mon Sep 17 00:00:00 2001 From: Jesse Plamondon-Willard Date: Sat, 7 Oct 2017 23:07:10 -0400 Subject: reorganise repo structure --- src/SMAPI/Framework/Reflection/CacheEntry.cs | 30 +++ src/SMAPI/Framework/Reflection/PrivateField.cs | 93 ++++++++ src/SMAPI/Framework/Reflection/PrivateMethod.cs | 99 ++++++++ src/SMAPI/Framework/Reflection/PrivateProperty.cs | 93 ++++++++ src/SMAPI/Framework/Reflection/Reflector.cs | 276 ++++++++++++++++++++++ 5 files changed, 591 insertions(+) create mode 100644 src/SMAPI/Framework/Reflection/CacheEntry.cs create mode 100644 src/SMAPI/Framework/Reflection/PrivateField.cs create mode 100644 src/SMAPI/Framework/Reflection/PrivateMethod.cs create mode 100644 src/SMAPI/Framework/Reflection/PrivateProperty.cs create mode 100644 src/SMAPI/Framework/Reflection/Reflector.cs (limited to 'src/SMAPI/Framework/Reflection') diff --git a/src/SMAPI/Framework/Reflection/CacheEntry.cs b/src/SMAPI/Framework/Reflection/CacheEntry.cs new file mode 100644 index 00000000..30faca37 --- /dev/null +++ b/src/SMAPI/Framework/Reflection/CacheEntry.cs @@ -0,0 +1,30 @@ +using System.Reflection; + +namespace StardewModdingAPI.Framework.Reflection +{ + /// A cached member reflection result. + internal struct CacheEntry + { + /********* + ** Accessors + *********/ + /// Whether the lookup found a valid match. + public bool IsValid; + + /// The reflection data for this member (or null if invalid). + public MemberInfo MemberInfo; + + + /********* + ** Public methods + *********/ + /// Construct an instance. + /// Whether the lookup found a valid match. + /// The reflection data for this member (or null if invalid). + public CacheEntry(bool isValid, MemberInfo memberInfo) + { + this.IsValid = isValid; + this.MemberInfo = memberInfo; + } + } +} diff --git a/src/SMAPI/Framework/Reflection/PrivateField.cs b/src/SMAPI/Framework/Reflection/PrivateField.cs new file mode 100644 index 00000000..0bf45969 --- /dev/null +++ b/src/SMAPI/Framework/Reflection/PrivateField.cs @@ -0,0 +1,93 @@ +using System; +using System.Reflection; + +namespace StardewModdingAPI.Framework.Reflection +{ + /// A private field obtained through reflection. + /// The field value type. + internal class PrivateField : IPrivateField + { + /********* + ** Properties + *********/ + /// The type that has the field. + private readonly Type ParentType; + + /// The object that has the instance field (if applicable). + private readonly object Parent; + + /// The display name shown in error messages. + private string DisplayName => $"{this.ParentType.FullName}::{this.FieldInfo.Name}"; + + + /********* + ** Accessors + *********/ + /// The reflection metadata. + public FieldInfo FieldInfo { get; } + + + /********* + ** Public methods + *********/ + /// Construct an instance. + /// The type that has the field. + /// The object that has the instance field (if applicable). + /// The reflection metadata. + /// Whether the field is static. + /// The or is null. + /// The is null for a non-static field, or not null for a static field. + public PrivateField(Type parentType, object obj, FieldInfo field, bool isStatic) + { + // validate + if (parentType == null) + throw new ArgumentNullException(nameof(parentType)); + if (field == null) + throw new ArgumentNullException(nameof(field)); + if (isStatic && obj != null) + throw new ArgumentException("A static field cannot have an object instance."); + if (!isStatic && obj == null) + throw new ArgumentException("A non-static field must have an object instance."); + + // save + this.ParentType = parentType; + this.Parent = obj; + this.FieldInfo = field; + } + + /// Get the field value. + public TValue GetValue() + { + try + { + return (TValue)this.FieldInfo.GetValue(this.Parent); + } + catch (InvalidCastException) + { + throw new InvalidCastException($"Can't convert the private {this.DisplayName} field from {this.FieldInfo.FieldType.FullName} to {typeof(TValue).FullName}."); + } + catch (Exception ex) + { + throw new Exception($"Couldn't get the value of the private {this.DisplayName} field", ex); + } + } + + /// Set the field value. + //// The value to set. + public void SetValue(TValue value) + { + try + { + this.FieldInfo.SetValue(this.Parent, value); + } + catch (InvalidCastException) + { + throw new InvalidCastException($"Can't assign the private {this.DisplayName} field a {typeof(TValue).FullName} value, must be compatible with {this.FieldInfo.FieldType.FullName}."); + } + catch (Exception ex) + { + throw new Exception($"Couldn't set the value of the private {this.DisplayName} field", ex); + } + } + } +} diff --git a/src/SMAPI/Framework/Reflection/PrivateMethod.cs b/src/SMAPI/Framework/Reflection/PrivateMethod.cs new file mode 100644 index 00000000..ba2374f4 --- /dev/null +++ b/src/SMAPI/Framework/Reflection/PrivateMethod.cs @@ -0,0 +1,99 @@ +using System; +using System.Reflection; + +namespace StardewModdingAPI.Framework.Reflection +{ + /// A private method obtained through reflection. + internal class PrivateMethod : IPrivateMethod + { + /********* + ** Properties + *********/ + /// The type that has the method. + private readonly Type ParentType; + + /// The object that has the instance method (if applicable). + private readonly object Parent; + + /// The display name shown in error messages. + private string DisplayName => $"{this.ParentType.FullName}::{this.MethodInfo.Name}"; + + + /********* + ** Accessors + *********/ + /// The reflection metadata. + public MethodInfo MethodInfo { get; } + + + /********* + ** Public methods + *********/ + /// Construct an instance. + /// The type that has the method. + /// The object that has the instance method(if applicable). + /// The reflection metadata. + /// Whether the field is static. + /// The or is null. + /// The is null for a non-static method, or not null for a static method. + public PrivateMethod(Type parentType, object obj, MethodInfo method, bool isStatic) + { + // validate + if (parentType == null) + throw new ArgumentNullException(nameof(parentType)); + if (method == null) + throw new ArgumentNullException(nameof(method)); + if (isStatic && obj != null) + throw new ArgumentException("A static method cannot have an object instance."); + if (!isStatic && obj == null) + throw new ArgumentException("A non-static method must have an object instance."); + + // save + this.ParentType = parentType; + this.Parent = obj; + this.MethodInfo = method; + } + + /// Invoke the method. + /// The return type. + /// The method arguments to pass in. + public TValue Invoke(params object[] arguments) + { + // invoke method + object result; + try + { + result = this.MethodInfo.Invoke(this.Parent, arguments); + } + catch (Exception ex) + { + throw new Exception($"Couldn't invoke the private {this.DisplayName} field", ex); + } + + // cast return value + try + { + return (TValue)result; + } + catch (InvalidCastException) + { + throw new InvalidCastException($"Can't convert the return value of the private {this.DisplayName} method from {this.MethodInfo.ReturnType.FullName} to {typeof(TValue).FullName}."); + } + } + + /// Invoke the method. + /// The method arguments to pass in. + public void Invoke(params object[] arguments) + { + // invoke method + try + { + this.MethodInfo.Invoke(this.Parent, arguments); + } + catch (Exception ex) + { + throw new Exception($"Couldn't invoke the private {this.DisplayName} field", ex); + } + } + } +} \ No newline at end of file diff --git a/src/SMAPI/Framework/Reflection/PrivateProperty.cs b/src/SMAPI/Framework/Reflection/PrivateProperty.cs new file mode 100644 index 00000000..08204b7e --- /dev/null +++ b/src/SMAPI/Framework/Reflection/PrivateProperty.cs @@ -0,0 +1,93 @@ +using System; +using System.Reflection; + +namespace StardewModdingAPI.Framework.Reflection +{ + /// A private property obtained through reflection. + /// The property value type. + internal class PrivateProperty : IPrivateProperty + { + /********* + ** Properties + *********/ + /// The type that has the field. + private readonly Type ParentType; + + /// The object that has the instance field (if applicable). + private readonly object Parent; + + /// The display name shown in error messages. + private string DisplayName => $"{this.ParentType.FullName}::{this.PropertyInfo.Name}"; + + + /********* + ** Accessors + *********/ + /// The reflection metadata. + public PropertyInfo PropertyInfo { get; } + + + /********* + ** Public methods + *********/ + /// Construct an instance. + /// The type that has the field. + /// The object that has the instance field (if applicable). + /// The reflection metadata. + /// Whether the field is static. + /// The or is null. + /// The is null for a non-static field, or not null for a static field. + public PrivateProperty(Type parentType, object obj, PropertyInfo property, bool isStatic) + { + // validate + if (parentType == null) + throw new ArgumentNullException(nameof(parentType)); + if (property == null) + throw new ArgumentNullException(nameof(property)); + if (isStatic && obj != null) + throw new ArgumentException("A static property cannot have an object instance."); + if (!isStatic && obj == null) + throw new ArgumentException("A non-static property must have an object instance."); + + // save + this.ParentType = parentType; + this.Parent = obj; + this.PropertyInfo = property; + } + + /// Get the property value. + public TValue GetValue() + { + try + { + return (TValue)this.PropertyInfo.GetValue(this.Parent); + } + catch (InvalidCastException) + { + throw new InvalidCastException($"Can't convert the private {this.DisplayName} property from {this.PropertyInfo.PropertyType.FullName} to {typeof(TValue).FullName}."); + } + catch (Exception ex) + { + throw new Exception($"Couldn't get the value of the private {this.DisplayName} property", ex); + } + } + + /// Set the property value. + //// The value to set. + public void SetValue(TValue value) + { + try + { + this.PropertyInfo.SetValue(this.Parent, value); + } + catch (InvalidCastException) + { + throw new InvalidCastException($"Can't assign the private {this.DisplayName} property a {typeof(TValue).FullName} value, must be compatible with {this.PropertyInfo.PropertyType.FullName}."); + } + catch (Exception ex) + { + throw new Exception($"Couldn't set the value of the private {this.DisplayName} property", ex); + } + } + } +} diff --git a/src/SMAPI/Framework/Reflection/Reflector.cs b/src/SMAPI/Framework/Reflection/Reflector.cs new file mode 100644 index 00000000..5c2d90fa --- /dev/null +++ b/src/SMAPI/Framework/Reflection/Reflector.cs @@ -0,0 +1,276 @@ +using System; +using System.Linq; +using System.Reflection; +using System.Runtime.Caching; + +namespace StardewModdingAPI.Framework.Reflection +{ + /// Provides helper methods for accessing private game code. + /// This implementation searches up the type hierarchy, and caches the reflected fields and methods with a sliding expiry (to optimise performance without unnecessary memory usage). + internal class Reflector + { + /********* + ** Properties + *********/ + /// The cached fields and methods found via reflection. + private readonly MemoryCache Cache = new MemoryCache(typeof(Reflector).FullName); + + /// The sliding cache expiration time. + private readonly TimeSpan SlidingCacheExpiry = TimeSpan.FromMinutes(5); + + + /********* + ** Public methods + *********/ + /**** + ** Fields + ****/ + /// Get a private instance field. + /// The field type. + /// The object which has the field. + /// The field name. + /// Whether to throw an exception if the private field is not found. + /// Returns the field wrapper, or null if the field doesn't exist and is false. + public IPrivateField GetPrivateField(object obj, string name, bool required = true) + { + // validate + if (obj == null) + throw new ArgumentNullException(nameof(obj), "Can't get a private instance field from a null object."); + + // get field from hierarchy + IPrivateField field = this.GetFieldFromHierarchy(obj.GetType(), obj, name, BindingFlags.Instance | BindingFlags.NonPublic); + if (required && field == null) + throw new InvalidOperationException($"The {obj.GetType().FullName} object doesn't have a private '{name}' instance field."); + return field; + } + + /// Get a private static field. + /// The field type. + /// The type which has the field. + /// The field name. + /// Whether to throw an exception if the private field is not found. + public IPrivateField GetPrivateField(Type type, string name, bool required = true) + { + // get field from hierarchy + IPrivateField field = this.GetFieldFromHierarchy(type, null, name, BindingFlags.NonPublic | BindingFlags.Static); + if (required && field == null) + throw new InvalidOperationException($"The {type.FullName} object doesn't have a private '{name}' static field."); + return field; + } + + /**** + ** Properties + ****/ + /// Get a private instance property. + /// The property type. + /// The object which has the property. + /// The property name. + /// Whether to throw an exception if the private property is not found. + public IPrivateProperty GetPrivateProperty(object obj, string name, bool required = true) + { + // validate + if (obj == null) + throw new ArgumentNullException(nameof(obj), "Can't get a private instance property from a null object."); + + // get property from hierarchy + IPrivateProperty property = this.GetPropertyFromHierarchy(obj.GetType(), obj, name, BindingFlags.Instance | BindingFlags.NonPublic); + if (required && property == null) + throw new InvalidOperationException($"The {obj.GetType().FullName} object doesn't have a private '{name}' instance property."); + return property; + } + + /// Get a private static property. + /// The property type. + /// The type which has the property. + /// The property name. + /// Whether to throw an exception if the private property is not found. + public IPrivateProperty GetPrivateProperty(Type type, string name, bool required = true) + { + // get field from hierarchy + IPrivateProperty property = this.GetPropertyFromHierarchy(type, null, name, BindingFlags.NonPublic | BindingFlags.Static); + if (required && property == null) + throw new InvalidOperationException($"The {type.FullName} object doesn't have a private '{name}' static property."); + return property; + } + + /**** + ** Methods + ****/ + /// Get a private instance method. + /// The object which has the method. + /// The field name. + /// Whether to throw an exception if the private field is not found. + public IPrivateMethod GetPrivateMethod(object obj, string name, bool required = true) + { + // validate + if (obj == null) + throw new ArgumentNullException(nameof(obj), "Can't get a private instance method from a null object."); + + // get method from hierarchy + IPrivateMethod method = this.GetMethodFromHierarchy(obj.GetType(), obj, name, BindingFlags.Instance | BindingFlags.NonPublic); + if (required && method == null) + throw new InvalidOperationException($"The {obj.GetType().FullName} object doesn't have a private '{name}' instance method."); + return method; + } + + /// Get a private static method. + /// The type which has the method. + /// The field name. + /// Whether to throw an exception if the private field is not found. + public IPrivateMethod GetPrivateMethod(Type type, string name, bool required = true) + { + // get method from hierarchy + IPrivateMethod method = this.GetMethodFromHierarchy(type, null, name, BindingFlags.NonPublic | BindingFlags.Static); + if (required && method == null) + throw new InvalidOperationException($"The {type.FullName} object doesn't have a private '{name}' static method."); + return method; + } + + /**** + ** Methods by signature + ****/ + /// Get a private instance method. + /// The object which has the method. + /// The field name. + /// The argument types of the method signature to find. + /// Whether to throw an exception if the private field is not found. + public IPrivateMethod GetPrivateMethod(object obj, string name, Type[] argumentTypes, bool required = true) + { + // validate parent + if (obj == null) + throw new ArgumentNullException(nameof(obj), "Can't get a private instance method from a null object."); + + // get method from hierarchy + PrivateMethod method = this.GetMethodFromHierarchy(obj.GetType(), obj, name, BindingFlags.Instance | BindingFlags.NonPublic, argumentTypes); + if (required && method == null) + throw new InvalidOperationException($"The {obj.GetType().FullName} object doesn't have a private '{name}' instance method with that signature."); + return method; + } + + /// Get a private static method. + /// The type which has the method. + /// The field name. + /// The argument types of the method signature to find. + /// Whether to throw an exception if the private field is not found. + public IPrivateMethod GetPrivateMethod(Type type, string name, Type[] argumentTypes, bool required = true) + { + // get field from hierarchy + PrivateMethod method = this.GetMethodFromHierarchy(type, null, name, BindingFlags.NonPublic | BindingFlags.Static, argumentTypes); + if (required && method == null) + throw new InvalidOperationException($"The {type.FullName} object doesn't have a private '{name}' static method with that signature."); + return method; + } + + + /********* + ** Private methods + *********/ + /// Get a field from the type hierarchy. + /// The expected field type. + /// The type which has the field. + /// The object which has the field. + /// The field name. + /// The reflection binding which flags which indicates what type of field to find. + private IPrivateField GetFieldFromHierarchy(Type type, object obj, string name, BindingFlags bindingFlags) + { + bool isStatic = bindingFlags.HasFlag(BindingFlags.Static); + FieldInfo field = this.GetCached($"field::{isStatic}::{type.FullName}::{name}", () => + { + FieldInfo fieldInfo = null; + for (; type != null && fieldInfo == null; type = type.BaseType) + fieldInfo = type.GetField(name, bindingFlags); + return fieldInfo; + }); + + return field != null + ? new PrivateField(type, obj, field, isStatic) + : null; + } + + /// Get a property from the type hierarchy. + /// The expected property type. + /// The type which has the property. + /// The object which has the property. + /// The property name. + /// The reflection binding which flags which indicates what type of property to find. + private IPrivateProperty GetPropertyFromHierarchy(Type type, object obj, string name, BindingFlags bindingFlags) + { + bool isStatic = bindingFlags.HasFlag(BindingFlags.Static); + PropertyInfo property = this.GetCached($"property::{isStatic}::{type.FullName}::{name}", () => + { + PropertyInfo propertyInfo = null; + for (; type != null && propertyInfo == null; type = type.BaseType) + propertyInfo = type.GetProperty(name, bindingFlags); + return propertyInfo; + }); + + return property != null + ? new PrivateProperty(type, obj, property, isStatic) + : null; + } + + /// Get a method from the type hierarchy. + /// The type which has the method. + /// The object which has the method. + /// The method name. + /// The reflection binding which flags which indicates what type of method to find. + private IPrivateMethod GetMethodFromHierarchy(Type type, object obj, string name, BindingFlags bindingFlags) + { + bool isStatic = bindingFlags.HasFlag(BindingFlags.Static); + MethodInfo method = this.GetCached($"method::{isStatic}::{type.FullName}::{name}", () => + { + MethodInfo methodInfo = null; + for (; type != null && methodInfo == null; type = type.BaseType) + methodInfo = type.GetMethod(name, bindingFlags); + return methodInfo; + }); + + return method != null + ? new PrivateMethod(type, obj, method, isStatic: bindingFlags.HasFlag(BindingFlags.Static)) + : null; + } + + /// Get a method from the type hierarchy. + /// The type which has the method. + /// The object which has the method. + /// The method name. + /// The reflection binding which flags which indicates what type of method to find. + /// The argument types of the method signature to find. + private PrivateMethod GetMethodFromHierarchy(Type type, object obj, string name, BindingFlags bindingFlags, Type[] argumentTypes) + { + bool isStatic = bindingFlags.HasFlag(BindingFlags.Static); + MethodInfo method = this.GetCached($"method::{isStatic}::{type.FullName}::{name}({string.Join(",", argumentTypes.Select(p => p.FullName))})", () => + { + MethodInfo methodInfo = null; + for (; type != null && methodInfo == null; type = type.BaseType) + methodInfo = type.GetMethod(name, bindingFlags, null, argumentTypes, null); + return methodInfo; + }); + return method != null + ? new PrivateMethod(type, obj, method, isStatic) + : null; + } + + /// Get a method or field through the cache. + /// The expected type. + /// The cache key. + /// Fetches a new value to cache. + private TMemberInfo GetCached(string key, Func fetch) where TMemberInfo : MemberInfo + { + // get from cache + if (this.Cache.Contains(key)) + { + CacheEntry entry = (CacheEntry)this.Cache[key]; + return entry.IsValid + ? (TMemberInfo)entry.MemberInfo + : default(TMemberInfo); + } + + // fetch & cache new value + TMemberInfo result = fetch(); + CacheEntry cacheEntry = new CacheEntry(result != null, result); + this.Cache.Add(key, cacheEntry, new CacheItemPolicy { SlidingExpiration = this.SlidingCacheExpiry }); + return result; + } + } +} -- cgit