//------------------------------------------------------------------------------
// <copyright file="WebPartUtil.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
//------------------------------------------------------------------------------

namespace System.Web.UI.WebControls.WebParts {

    using System;
    using System.Diagnostics;
    using System.Reflection;
    using System.Web.Compilation;

    internal static class WebPartUtil {

        // Called from WebPartManagerInternals and ConnectionsZone.
        internal static object CreateObjectFromType(Type type) {
            return HttpRuntime.FastCreatePublicInstance(type);
        }

        // We use BuildManager.GetType() instead of Type.GetType() so we can load types from the
        // Code directory, even if no assembly is specified.
        internal static Type DeserializeType(string typeName, bool throwOnError) {
            return BuildManager.GetType(typeName, throwOnError);
        }

        internal static Type[] GetTypesForConstructor(ConstructorInfo constructor) {
            Debug.Assert(constructor != null);
            ParameterInfo[] parameters = constructor.GetParameters();
            Type[] types = new Type[parameters.Length];
            for (int i = 0; i < parameters.Length; i++) {
                types[i] = parameters[i].ParameterType;
            }
            return types;
        }

        internal static bool IsConnectionPointTypeValid(Type connectionPointType, bool isConsumer) {
            if (connectionPointType == null) {
                return true;
            }

            if (!(connectionPointType.IsPublic || connectionPointType.IsNestedPublic)) {
                return false;
            }

            Type baseType = isConsumer ? typeof(ConsumerConnectionPoint) : typeof(ProviderConnectionPoint);
            if (!connectionPointType.IsSubclassOf(baseType)) {
                return false;
            }

            Type[] constructorTypes = isConsumer ? ConsumerConnectionPoint.ConstructorTypes :
                ProviderConnectionPoint.ConstructorTypes;
            ConstructorInfo constructor = connectionPointType.GetConstructor(constructorTypes);
            if (constructor == null) {
                return false;
            }

            return true;
        }

        // This helper method used to be needed to resolve types in the Code directory.  Since this
        // was fixed in VSWhidbey 380793, we can just use Type.AssemblyQualifiedName instead of
        // Type.FullName.  However, I am leaving this helper method in place in case we need to make
        // another fix in the future.
        internal static string SerializeType(Type type) {
            if (type.Assembly.GlobalAssemblyCache) {
                return type.AssemblyQualifiedName;
            }
            else {
                return type.FullName;
            }
        }
    }
}