578 lines
25 KiB
C#
578 lines
25 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="ObjectConverter.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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using System.Collections;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Globalization;
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using System.Reflection;
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using System.Web.Resources;
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namespace System.Web.Script.Serialization {
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internal static class ObjectConverter {
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private static readonly Type[] s_emptyTypeArray = new Type[] { };
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private static Type _listGenericType = typeof(List<>);
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private static Type _enumerableGenericType = typeof(IEnumerable<>);
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private static Type _dictionaryGenericType = typeof(Dictionary<,>);
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private static Type _idictionaryGenericType = typeof(IDictionary<,>);
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// Helper method that recursively convert individual items in the old array
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private static bool AddItemToList(IList oldList, IList newList, Type elementType, JavaScriptSerializer serializer, bool throwOnError) {
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object convertedObject;
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foreach (Object propertyValue in oldList) {
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if (!ConvertObjectToTypeMain(propertyValue, elementType, serializer, throwOnError, out convertedObject)) {
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return false;
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}
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newList.Add(convertedObject);
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}
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return true;
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}
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// Helper method that assigns the propertyValue to object o's member (memberName)
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private static bool AssignToPropertyOrField(object propertyValue, object o, string memberName, JavaScriptSerializer serializer, bool throwOnError) {
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IDictionary dictionary = o as IDictionary;
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// if o is already an idictionary, assign the value to the dictionary
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if (dictionary != null) {
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if (!ConvertObjectToTypeMain(propertyValue, null, serializer, throwOnError, out propertyValue)) {
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return false;
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}
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dictionary[memberName] = propertyValue;
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return true;
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}
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Type serverType = o.GetType();
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// First, look for a property
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PropertyInfo propInfo = serverType.GetProperty(memberName,
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BindingFlags.Instance | BindingFlags.IgnoreCase | BindingFlags.Public);
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if (propInfo != null) {
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// Ignore it if the property has no setter
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MethodInfo setter = propInfo.GetSetMethod();
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if (setter != null) {
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// Deserialize the property value, with knownledge of the property type
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if (!ConvertObjectToTypeMain(propertyValue, propInfo.PropertyType, serializer, throwOnError, out propertyValue)) {
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return false;
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}
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// Set the property in the object
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try {
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setter.Invoke(o, new Object[] { propertyValue });
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return true;
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}
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catch {
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if (throwOnError) {
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throw;
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}
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else {
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return false;
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}
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}
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}
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}
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// We couldn't find a property, so try a field
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FieldInfo fieldInfo = serverType.GetField(memberName,
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BindingFlags.Instance | BindingFlags.IgnoreCase | BindingFlags.Public);
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if (fieldInfo != null) {
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// Deserialize the field value, with knownledge of the field type
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if (!ConvertObjectToTypeMain(propertyValue, fieldInfo.FieldType, serializer, throwOnError, out propertyValue)) {
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return false;
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}
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// Set the field in the object
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try {
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fieldInfo.SetValue(o, propertyValue);
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return true;
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}
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catch {
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if (throwOnError) {
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throw;
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}
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else {
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return false;
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}
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}
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}
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// not a property or field, so it is ignored
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return true;
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}
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// Method that converts an IDictionary<string, object> to an object of the right type
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private static bool ConvertDictionaryToObject(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer, bool throwOnError, out object convertedObject) {
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// The target type to instantiate.
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Type targetType = type;
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object s;
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string serverTypeName = null;
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object o = dictionary;
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// Check if __serverType exists in the dictionary, use it as the type.
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if (dictionary.TryGetValue(JavaScriptSerializer.ServerTypeFieldName, out s)) {
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// Convert the __serverType value to a string.
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if (!ConvertObjectToTypeMain(s, typeof(String), serializer, throwOnError, out s)) {
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convertedObject = false;
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return false;
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}
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serverTypeName = (string)s;
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if (serverTypeName != null) {
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// If we don't have the JavaScriptTypeResolver, we can't use it
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if (serializer.TypeResolver != null) {
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// Get the actual type from the resolver.
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targetType = serializer.TypeResolver.ResolveType(serverTypeName);
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// In theory, we should always find the type. If not, it may be some kind of attack.
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if (targetType == null) {
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if (throwOnError) {
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throw new InvalidOperationException();
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}
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convertedObject = null;
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return false;
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}
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}
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// Remove the serverType from the dictionary, even if the resolver was null
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dictionary.Remove(JavaScriptSerializer.ServerTypeFieldName);
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}
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}
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JavaScriptConverter converter = null;
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if (targetType != null && serializer.ConverterExistsForType(targetType, out converter)) {
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try {
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convertedObject = converter.Deserialize(dictionary, targetType, serializer);
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return true;
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}
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catch {
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if (throwOnError) {
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throw;
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}
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convertedObject = null;
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return false;
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}
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}
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// Instantiate the type if it's coming from the __serverType argument.
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if (serverTypeName != null || IsClientInstantiatableType(targetType, serializer)) {
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// First instantiate the object based on the type.
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o = Activator.CreateInstance(targetType);
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}
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#if INDIGO
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StructuralContract contract = null;
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if (suggestedType != null &&
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suggestedType.GetCustomAttributes(typeof(DataContractAttribute), false).Length > 0)
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contract = StructuralContract.Create(suggestedType);
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#endif
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// Use a different collection to avoid modifying the original during keys enumeration.
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List<String> memberNames = new List<String>(dictionary.Keys);
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// Try to handle the IDictionary<K, V> case
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if (IsGenericDictionary(type)) {
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Type keyType = type.GetGenericArguments()[0];
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if (keyType != typeof(string) && keyType != typeof(object)) {
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if (throwOnError) {
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throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_DictionaryTypeNotSupported, type.FullName));
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}
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convertedObject = null;
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return false;
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}
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Type valueType = type.GetGenericArguments()[1];
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IDictionary dict = null;
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if (IsClientInstantiatableType(type, serializer)) {
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dict = (IDictionary)Activator.CreateInstance(type);
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}
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else {
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// Get the strongly typed Dictionary<K, V>
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Type t = _dictionaryGenericType.MakeGenericType(keyType, valueType);
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dict = (IDictionary)Activator.CreateInstance(t);
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}
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if (dict != null) {
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foreach (string memberName in memberNames) {
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object memberObject;
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if (!ConvertObjectToTypeMain(dictionary[memberName], valueType, serializer, throwOnError, out memberObject)) {
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convertedObject = null;
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return false;
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}
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dict[memberName] = memberObject;
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}
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convertedObject = dict;
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return true;
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}
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}
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// Fail if we know we cannot possibly return the required type.
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if (type != null && !type.IsAssignableFrom(o.GetType())) {
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if (!throwOnError) {
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convertedObject = null;
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return false;
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}
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ConstructorInfo constructorInfo = type.GetConstructor(BindingFlags.Public | BindingFlags.Instance, null, s_emptyTypeArray, null);
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if (constructorInfo == null) {
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throw new MissingMethodException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_NoConstructor, type.FullName));
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}
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throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_DeserializerTypeMismatch, type.FullName));
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}
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foreach (string memberName in memberNames) {
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object propertyValue = dictionary[memberName];
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#if INDIGO
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if (contract != null) {
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Member member = contract.FindMember(memberName);
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//
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if (member == null)
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throw new InvalidOperationException();
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if (member.MemberType == MemberTypes.Field) {
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member.SetValue(o, propertyValue);
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}
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else {
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member.SetValue(o, propertyValue);
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}
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continue;
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}
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#endif
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// Assign the value into a property or field of the object
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if (!AssignToPropertyOrField(propertyValue, o, memberName, serializer, throwOnError)) {
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convertedObject = null;
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return false;
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}
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}
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convertedObject = o;
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return true;
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}
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internal static object ConvertObjectToType(object o, Type type, JavaScriptSerializer serializer) {
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object convertedObject;
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ConvertObjectToTypeMain(o, type, serializer, true, out convertedObject);
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return convertedObject;
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}
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private static bool ConvertObjectToTypeMain(object o, Type type, JavaScriptSerializer serializer, bool throwOnError, out object convertedObject) {
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// If it's null, there is nothing to convert
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if (o == null) {
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// need to special case Char, as we convert \0 to null
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if (type == typeof(char)) {
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convertedObject = '\0';
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return true;
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}
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// Throw if its a value type and not a nullable
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if (IsNonNullableValueType(type)) {
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if (throwOnError) {
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throw new InvalidOperationException(AtlasWeb.JSON_ValueTypeCannotBeNull);
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}
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else {
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convertedObject = null;
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return false;
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}
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}
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convertedObject = null;
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return true;
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}
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// simply return the current object if the current type is same as return type.
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if (o.GetType() == type) {
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convertedObject = o;
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return true;
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}
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// otherwise use the converters to convert object into target type.
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return ConvertObjectToTypeInternal(o, type, serializer, throwOnError, out convertedObject);
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}
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// Helper method that converts the object to the corresponding type using converters.
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// Items in IDictionary<string, object> and ArrayList needs to be converted as well.
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// Note this method does not invoke the custom converter for deserialization.
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private static bool ConvertObjectToTypeInternal(object o, Type type, JavaScriptSerializer serializer, bool throwOnError, out object convertedObject) {
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// First checks if the object is an IDictionary<string, object>
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IDictionary<string, object> dictionary = o as IDictionary<string, object>;
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if (dictionary != null) {
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return ConvertDictionaryToObject(dictionary, type, serializer, throwOnError, out convertedObject);
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}
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// If it is an IList try to convert it to the requested type.
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IList list = o as IList;
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if (list != null) {
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IList convertedList;
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if (ConvertListToObject(list, type, serializer, throwOnError, out convertedList)) {
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convertedObject = convertedList;
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return true;
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}
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else {
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convertedObject = null;
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return false;
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}
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}
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// simply return the current object if
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// 1) the caller does not specify the return type.
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// 2) if the current type is same as return type.
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if (type == null || o.GetType() == type) {
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convertedObject = o;
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return true;
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}
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// Otherwise use the type converter to convert the string to the target type.
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TypeConverter converter = TypeDescriptor.GetConverter(type);
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// Use the memberType's converter to directly conver if supported.
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if (converter.CanConvertFrom(o.GetType())) {
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try {
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convertedObject = converter.ConvertFrom(null, CultureInfo.InvariantCulture, o);
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return true;
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}
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catch {
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if (throwOnError) {
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throw;
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}
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else {
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convertedObject = null;
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return false;
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}
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}
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}
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// Otherwise if the target type can be converted from a string
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// 1. first use the propertyValue's converter to convert object to string,
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// 2. then use the target converter to convert the string to target type.
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if (converter.CanConvertFrom(typeof(String))) {
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try {
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string s;
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if (o is DateTime) {
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// when converting from DateTime it is important to use the 'u' format
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// so it contains the 'Z' indicating that it is UTC time.
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// If converting to DateTimeOffset this ensures the value is correct, since otherwise
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// the deafult offset would be assumed, which is the server's timezone.
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s = ((DateTime)o).ToUniversalTime().ToString("u", CultureInfo.InvariantCulture);
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}
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else {
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TypeConverter propertyConverter = TypeDescriptor.GetConverter(o);
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s = propertyConverter.ConvertToInvariantString(o);
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}
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convertedObject = converter.ConvertFromInvariantString(s);
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return true;
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}
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catch {
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if (throwOnError) {
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throw;
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}
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else {
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convertedObject = null;
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return false;
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}
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}
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}
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// We can't convert object o to the target type, but perhaps o can be
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// assigned directly to type?
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if (type.IsAssignableFrom(o.GetType())) {
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convertedObject = o;
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return true;
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}
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// Nothing works
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if (throwOnError) {
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throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, AtlasWeb.JSON_CannotConvertObjectToType, o.GetType(), type));
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}
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else {
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convertedObject = null;
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return false;
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}
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}
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// Method that converts client array to the request type. It handles the following cases:
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// 1. type is not passed in - An ArrayList will be returned.
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// 2. type is an array - An array of the right type will be returned.
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// 3. type is an abstract collection interface, e.g. IEnumerable, ICollection -
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// An ArrayList will be returned.
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// 4. type is an generic abstract collection interface, e.g. IEnumerable<T> -
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// An List<T> will be returned.
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// 5. type is a concrete type that implements IList -
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// The type will be instantiated and returned.
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// Otherwise we throw InvalidOperationException.
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private static bool ConvertListToObject(IList list, Type type, JavaScriptSerializer serializer, bool throwOnError, out IList convertedList) {
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// Add the items into an ArrayList then convert to custom type when
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// 1. Type is null or typeof(Object)
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// 2. Type is an Array, in which case we call ArrayList.ToArray(type) or
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// 3. Type is already an ArrayList
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if (type == null || type == typeof(Object) || IsArrayListCompatible(type)) {
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Type elementType = typeof(Object);
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if (type != null && type != typeof(Object)) {
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elementType = type.GetElementType();
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}
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ArrayList newList = new ArrayList();
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// Add the items to the new List and recursive into each item.
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if (!AddItemToList(list, newList, elementType, serializer, throwOnError)) {
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convertedList = null;
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return false;
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}
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if (type == typeof(ArrayList) || type == typeof(IEnumerable) || type == typeof(IList) || type == typeof(ICollection)) {
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convertedList = newList;
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return true;
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}
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convertedList = newList.ToArray(elementType);
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return true;
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}
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// Add the items into an List<T> then convert to the custom generic type when
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// 1. Type is a generic collection type
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// 2. Type only has one generic parameter, eg. List<string> vs MyCustom<T, V>
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// 3. Type implements IEnumerable<T>
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else if (type.IsGenericType &&
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type.GetGenericArguments().Length == 1) {
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// gets the T of List<T> as the elementType
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Type elementType = type.GetGenericArguments()[0];
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// Get the strongly typed IEnumerable<T>
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Type strongTypedEnumerable = _enumerableGenericType.MakeGenericType(elementType);
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// Make sure the custom type can be assigned to IEnumerable<T>
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if (strongTypedEnumerable.IsAssignableFrom(type)) {
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// Get the strongly typed List<T>
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Type t = _listGenericType.MakeGenericType(elementType);
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// Create the List<T> instance or a MyList<T>
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IList newList = null;
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if (IsClientInstantiatableType(type, serializer) && typeof(IList).IsAssignableFrom(type)) {
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newList = (IList)Activator.CreateInstance(type);
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}
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else {
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// If this is MyList<T> and we can't assign to it, throw
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if (t.IsAssignableFrom(type)) {
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if (throwOnError) {
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throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture, AtlasWeb.JSON_CannotCreateListType, type.FullName));
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}
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else {
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convertedList = null;
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return false;
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}
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}
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newList = (IList)Activator.CreateInstance(t);
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}
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// Add the items to the new List and recursive into each item.
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if (!AddItemToList(list, newList, elementType, serializer, throwOnError)) {
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convertedList = null;
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return false;
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}
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convertedList = newList;
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return true;
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}
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}
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// If the custom type implements IList and it's instantiable. Use that type.
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else if (IsClientInstantiatableType(type, serializer) && typeof(IList).IsAssignableFrom(type)) {
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IList newList = (IList)Activator.CreateInstance(type);
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// Add the items to the new List and recursive into each item.
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if (!AddItemToList(list, newList, null, serializer, throwOnError)) {
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convertedList = null;
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return false;
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}
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convertedList = newList;
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return true;
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}
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if (throwOnError) {
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throw new InvalidOperationException(String.Format(
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CultureInfo.CurrentCulture, AtlasWeb.JSON_ArrayTypeNotSupported, type.FullName));
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}
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else {
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convertedList = null;
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return false;
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}
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}
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private static bool IsArrayListCompatible(Type type) {
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return type.IsArray || type == typeof(ArrayList) || type == typeof(IEnumerable) || type == typeof(IList) || type == typeof(ICollection);
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}
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// Is this a type for which we want to instantiate based on the client stub
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internal static bool IsClientInstantiatableType(Type t, JavaScriptSerializer serializer) {
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// Abstract classes and interfaces can't be instantiated
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//
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if (t == null || t.IsAbstract || t.IsInterface || t.IsArray)
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return false;
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// Even though 'object' is instantiatable, it is never useful to do this
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if (t == typeof(object))
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return false;
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// Return true if a converter is registered for the given type, so the converter
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// can generate code on the client to instantiate it.
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|
JavaScriptConverter converter = null;
|
|
if (serializer.ConverterExistsForType(t, out converter)) {
|
|
return true;
|
|
}
|
|
|
|
// Value types are okay (i.e. structs);
|
|
if (t.IsValueType) {
|
|
return true;
|
|
}
|
|
|
|
// Ignore types that don't have a public default ctor
|
|
ConstructorInfo constructorInfo = t.GetConstructor(BindingFlags.Public | BindingFlags.Instance,
|
|
null, s_emptyTypeArray, null);
|
|
if (constructorInfo == null)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
// these helper methods replace inline code.
|
|
// they simplify the code and reduce our cyclomatic complexity
|
|
|
|
private static bool IsGenericDictionary(Type type) {
|
|
return type != null &&
|
|
type.IsGenericType &&
|
|
(typeof(IDictionary).IsAssignableFrom(type) || type.GetGenericTypeDefinition() == _idictionaryGenericType) &&
|
|
type.GetGenericArguments().Length == 2;
|
|
}
|
|
|
|
private static bool IsNonNullableValueType(Type type) {
|
|
// the the type a value type, and if it is, is it not the nullable variety
|
|
return type != null && type.IsValueType &&
|
|
!(type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>));
|
|
}
|
|
|
|
internal static bool TryConvertObjectToType(object o, Type type, JavaScriptSerializer serializer, out object convertedObject) {
|
|
return ConvertObjectToTypeMain(o, type, serializer, false, out convertedObject);
|
|
}
|
|
}
|
|
}
|