Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / ELinq / TypeSystem.cs / 1599186 / TypeSystem.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] //--------------------------------------------------------------------- using System.Collections.Generic; using System.Reflection; using System.Data.Entity; using System.Diagnostics; using System.Linq; using System.Linq.Expressions; using System.Runtime.CompilerServices; namespace System.Data.Objects.ELinq { ////// Static utility class. Replica of query\DLinq\TypeSystem.cs /// internal static class TypeSystem { private static readonly MethodInfo s_getDefaultMethod = typeof(TypeSystem).GetMethod( "GetDefault", BindingFlags.Static | BindingFlags.NonPublic); private static T GetDefault() { return default(T); } [MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.NoOptimization)] internal static object GetDefaultValue(Type type) { // null is always the default for non value types and Nullable<> if (!type.IsValueType || (type.IsGenericType && typeof(Nullable<>) == type.GetGenericTypeDefinition())) { return null; } MethodInfo getDefaultMethod = s_getDefaultMethod.MakeGenericMethod(type); object defaultValue = getDefaultMethod.Invoke(null, new object[] { }); return defaultValue; } internal static bool IsSequenceType(Type seqType) { return FindIEnumerable(seqType) != null; } internal static Type GetDelegateType(IEnumerable inputTypes, Type returnType) { EntityUtil.CheckArgumentNull(returnType, "returnType"); // Determine Func<> type (generic args are the input parameter types plus the return type) inputTypes = inputTypes ?? Enumerable.Empty (); int argCount = inputTypes.Count(); Type[] typeArgs = new Type[argCount + 1]; int i = 0; foreach (Type typeArg in inputTypes) { typeArgs[i++] = typeArg; } typeArgs[i] = returnType; // Find appropriate Func<> Type delegateType; switch (argCount) { case 0: delegateType = typeof(Func<>); break; case 1: delegateType = typeof(Func<,>); break; case 2: delegateType = typeof(Func<,,>); break; case 3: delegateType = typeof(Func<,,,>); break; case 4: delegateType = typeof(Func<,,,,>); break; case 5: delegateType = typeof(Func<,,,,,>); break; case 6: delegateType = typeof(Func<,,,,,,>); break; case 7: delegateType = typeof(Func<,,,,,,,>); break; case 8: delegateType = typeof(Func<,,,,,,,,>); break; case 9: delegateType = typeof(Func<,,,,,,,,,>); break; case 10: delegateType = typeof(Func<,,,,,,,,,,>); break; case 11: delegateType = typeof(Func<,,,,,,,,,,,>); break; case 12: delegateType = typeof(Func<,,,,,,,,,,,,>); break; case 13: delegateType = typeof(Func<,,,,,,,,,,,,,>); break; case 14: delegateType = typeof(Func<,,,,,,,,,,,,,,>); break; case 15: delegateType = typeof(Func<,,,,,,,,,,,,,,,>); break; default: Debug.Fail("unexpected argument count"); delegateType = null; break; } delegateType = delegateType.MakeGenericType(typeArgs); return delegateType; } internal static Expression EnsureType(Expression expression, Type requiredType) { Debug.Assert(null != expression, "expression required"); Debug.Assert(null != requiredType, "requiredType"); if (expression.Type != requiredType) { expression = Expression.Convert(expression, requiredType); } return expression; } /// /// Resolves MemberInfo to a property or field. /// /// Member to test. /// Name of member. /// Type of member. ///Given member normalized as a property or field. internal static MemberInfo PropertyOrField(MemberInfo member, out string name, out Type type) { name = null; type = null; if (member.MemberType == MemberTypes.Field) { FieldInfo field = (FieldInfo)member; name = field.Name; type = field.FieldType; return field; } else if (member.MemberType == MemberTypes.Property) { PropertyInfo property = (PropertyInfo)member; if (0 != property.GetIndexParameters().Length) { // don't support indexed properties throw EntityUtil.NotSupported(System.Data.Entity.Strings.ELinq_PropertyIndexNotSupported); } name = property.Name; type = property.PropertyType; return property; } else if (member.MemberType == MemberTypes.Method) { // this may be a property accessor in disguise (if it's a RuntimeMethodHandle) MethodInfo method = (MethodInfo)member; if (method.IsSpecialName) // property accessor methods must set IsSpecialName { // try to find a property with the given getter foreach (PropertyInfo property in method.DeclaringType.GetProperties( BindingFlags.Static | BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)) { if (property.CanRead && (property.GetGetMethod(true) == method)) { return PropertyOrField(property, out name, out type); } } } } throw EntityUtil.NotSupported(System.Data.Entity.Strings.ELinq_NotPropertyOrField(member.Name)); } private static Type FindIEnumerable(Type seqType) { // Ignores "terminal" primitive types in the EDM although they may implement IEnumerable<> if (seqType == null || seqType == typeof(string) || seqType == typeof(byte[])) return null; if (seqType.IsArray) return typeof(IEnumerable<>).MakeGenericType(seqType.GetElementType()); if (seqType.IsGenericType) { foreach (Type arg in seqType.GetGenericArguments()) { Type ienum = typeof(IEnumerable<>).MakeGenericType(arg); if (ienum.IsAssignableFrom(seqType)) { return ienum; } } } Type[] ifaces = seqType.GetInterfaces(); if (ifaces != null && ifaces.Length > 0) { foreach (Type iface in ifaces) { Type ienum = FindIEnumerable(iface); if (ienum != null) return ienum; } } if (seqType.BaseType != null && seqType.BaseType != typeof(object)) { return FindIEnumerable(seqType.BaseType); } return null; } internal static Type GetElementType(Type seqType) { Type ienum = FindIEnumerable(seqType); if (ienum == null) return seqType; return ienum.GetGenericArguments()[0]; } internal static bool IsNullableType(Type type) { return type != null && type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>); } internal static Type GetNonNullableType(Type type) { if (IsNullableType(type)) { return type.GetGenericArguments()[0]; } return type; } internal static bool IsImplementationOfGenericInterfaceMethod(this MethodInfo test, Type match, out Type[] genericTypeArguments) { genericTypeArguments = null; // check requirements for a match if (null == test || null == match || !match.IsInterface || !match.IsGenericTypeDefinition || null == test.DeclaringType) { return false; } // we might be looking at the interface implementation directly if (test.DeclaringType.IsInterface && test.DeclaringType.IsGenericType && test.DeclaringType.GetGenericTypeDefinition() == match) { return true; } // figure out if we implement the interface foreach (Type testInterface in test.DeclaringType.GetInterfaces()) { if (testInterface.IsGenericType && testInterface.GetGenericTypeDefinition() == match) { // check if the method aligns var map = test.DeclaringType.GetInterfaceMap(testInterface); if (map.TargetMethods.Contains(test)) { genericTypeArguments = testInterface.GetGenericArguments(); return true; } } } return false; } internal static bool IsImplementationOf(this PropertyInfo propertyInfo, Type interfaceType) { Debug.Assert(interfaceType.IsInterface, "Ensure interfaceType is an interface before calling IsImplementationOf"); // Find the property with the corresponding name on the interface, if present PropertyInfo interfaceProp = interfaceType.GetProperty(propertyInfo.Name, BindingFlags.Public | BindingFlags.Instance); if (null == interfaceProp) { return false; } // If the declaring type is an interface, compare directly. if (propertyInfo.DeclaringType.IsInterface) { return interfaceProp.Equals(propertyInfo); } Debug.Assert(Enumerable.Contains(propertyInfo.DeclaringType.GetInterfaces(), interfaceType), "Ensure propertyInfo.DeclaringType implements interfaceType before calling IsImplementationOf"); bool result = false; // Get the get_method from the interface property. MethodInfo getInterfaceProp = interfaceProp.GetGetMethod(); // Retrieve the interface mapping for the interface on the candidate property's declaring type. InterfaceMapping interfaceMap = propertyInfo.DeclaringType.GetInterfaceMap(interfaceType); // Find the index of the interface's get_ method in the interface methods of the interface map int propIndex = Array.IndexOf(interfaceMap.InterfaceMethods, getInterfaceProp); // Find the method on the property's declaring type that is the target of the interface's get_ method. // This method will be at the same index in the interface mapping's target methods as the get_ interface method index. MethodInfo[] targetMethods = interfaceMap.TargetMethods; if (propIndex > -1 && propIndex < targetMethods.Length) { // If the get method of the referenced property is the target of the get_ method in this interface mapping, // then the property is the implementation of the interface's corresponding property. MethodInfo getPropertyMethod = propertyInfo.GetGetMethod(); if (getPropertyMethod != null) { result = getPropertyMethod.Equals(targetMethods[propIndex]); } } return result; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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