#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
using System.ComponentModel;
using Newtonsoft.Json.Serialization;
using System.Reflection;
#if !SILVERLIGHT
using System.Data.SqlTypes;
#endif
namespace Newtonsoft.Json.Utilities{
internal static class ConvertUtils
{
internal struct TypeConvertKey : IEquatable<TypeConvertKey>
{
private readonly Type _initialType;
private readonly Type _targetType;
public Type InitialType
{
get { return _initialType; }
}
public Type TargetType
{
get { return _targetType; }
}
public TypeConvertKey(Type initialType, Type targetType)
{
_initialType = initialType;
_targetType = targetType;
}
public override int GetHashCode()
{
return _initialType.GetHashCode() ^ _targetType.GetHashCode();
}
public override bool Equals(object obj)
{
if (!(obj is TypeConvertKey))
return false;
return Equals((TypeConvertKey)obj);
}
public bool Equals(TypeConvertKey other)
{
return (_initialType == other._initialType && _targetType == other._targetType);
}
}
private static readonly ThreadSafeStore<TypeConvertKey, Func<object, object>> CastConverters =
new ThreadSafeStore<TypeConvertKey, Func<object, object>>(CreateCastConverter);
private static Func<object, object> CreateCastConverter(TypeConvertKey t)
{
MethodInfo castMethodInfo = t.TargetType.GetMethod("op_Implicit", new[] { t.InitialType });
if (castMethodInfo == null)
castMethodInfo = t.TargetType.GetMethod("op_Explicit", new[] { t.InitialType });
if (castMethodInfo == null)
return null;
MethodCall<object, object> call = JsonTypeReflector.ReflectionDelegateFactory.CreateMethodCall<object>(castMethodInfo);
return o => call(null, o);
}
public static bool CanConvertType(Type initialType, Type targetType, bool allowTypeNameToString)
{
ValidationUtils.ArgumentNotNull(initialType, "initialType");
ValidationUtils.ArgumentNotNull(targetType, "targetType");
if (ReflectionUtils.IsNullableType(targetType))
targetType = Nullable.GetUnderlyingType(targetType);
if (targetType == initialType)
return true;
if (typeof(IConvertible).IsAssignableFrom(initialType) && typeof(IConvertible).IsAssignableFrom(targetType))
{
return true;
}
#if !PocketPC && !NET20
if (initialType == typeof(DateTime) && targetType == typeof(DateTimeOffset))
return true;
#endif
if (initialType == typeof(Guid) && (targetType == typeof(Guid) || targetType == typeof(string)))
return true;
if (initialType == typeof(Type) && targetType == typeof(string))
return true;
#if !PocketPC
// see if source or target types have a TypeConverter that converts between the two
TypeConverter toConverter = GetConverter(initialType);
if (toConverter != null && !IsComponentConverter(toConverter) && toConverter.CanConvertTo(targetType))
{
if (allowTypeNameToString || toConverter.GetType() != typeof(TypeConverter))
return true;
}
TypeConverter fromConverter = GetConverter(targetType);
if (fromConverter != null && !IsComponentConverter(fromConverter) && fromConverter.CanConvertFrom(initialType))
return true;
#endif
// handle DBNull and INullable
if (initialType == typeof(DBNull))
{
if (ReflectionUtils.IsNullable(targetType))
return true;
}
return false;
}
private static bool IsComponentConverter(TypeConverter converter)
{
#if !SILVERLIGHT && !PocketPC
return (converter is ComponentConverter);
#else
return false;
#endif
}
#region Convert
/// <summary>
/// Converts the value to the specified type.
/// </summary>
/// <typeparam name="T">The type to convert the value to.</typeparam>
/// <param name="initialValue">The value to convert.</param>
/// <returns>The converted type.</returns>
public static T Convert<T>(object initialValue)
{
return Convert<T>(initialValue, CultureInfo.CurrentCulture);
}
/// <summary>
/// Converts the value to the specified type.
/// </summary>
/// <typeparam name="T">The type to convert the value to.</typeparam>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <returns>The converted type.</returns>
public static T Convert<T>(object initialValue, CultureInfo culture)
{
return (T)Convert(initialValue, culture, typeof(T));
}
/// <summary>
/// Converts the value to the specified type.
/// </summary>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <param name="targetType">The type to convert the value to.</param>
/// <returns>The converted type.</returns>
public static object Convert(object initialValue, CultureInfo culture, Type targetType)
{
if (initialValue == null)
throw new ArgumentNullException("initialValue");
if (ReflectionUtils.IsNullableType(targetType))
targetType = Nullable.GetUnderlyingType(targetType);
Type initialType = initialValue.GetType();
if (targetType == initialType)
return initialValue;
if (initialValue is string && typeof(Type).IsAssignableFrom(targetType))
return Type.GetType((string) initialValue, true);
if (targetType.IsInterface || targetType.IsGenericTypeDefinition || targetType.IsAbstract)
throw new ArgumentException("Target type {0} is not a value type or a non-abstract class.".FormatWith(CultureInfo.InvariantCulture, targetType), "targetType");
// use Convert.ChangeType if both types are IConvertible
if (initialValue is IConvertible && typeof(IConvertible).IsAssignableFrom(targetType))
{
if (targetType.IsEnum)
{
if (initialValue is string)
return Enum.Parse(targetType, initialValue.ToString(), true);
else if (IsInteger(initialValue))
return Enum.ToObject(targetType, initialValue);
}
return System.Convert.ChangeType(initialValue, targetType, culture);
}
#if !PocketPC && !NET20
if (initialValue is DateTime && targetType == typeof(DateTimeOffset))
return new DateTimeOffset((DateTime)initialValue);
#endif
if (initialValue is string)
{
if (targetType == typeof (Guid))
return new Guid((string) initialValue);
if (targetType == typeof (Uri))
return new Uri((string) initialValue);
if (targetType == typeof (TimeSpan))
return TimeSpan.Parse((string) initialValue);
}
#if !PocketPC
// see if source or target types have a TypeConverter that converts between the two
TypeConverter toConverter = GetConverter(initialType);
if (toConverter != null && toConverter.CanConvertTo(targetType))
{
#if !SILVERLIGHT
return toConverter.ConvertTo(null, culture, initialValue, targetType);
#else
return toConverter.ConvertTo(initialValue, targetType);
#endif
}
TypeConverter fromConverter = GetConverter(targetType);
if (fromConverter != null && fromConverter.CanConvertFrom(initialType))
{
#if !SILVERLIGHT
return fromConverter.ConvertFrom(null, culture, initialValue);
#else
return fromConverter.ConvertFrom(initialValue);
#endif
}
#endif
// handle DBNull and INullable
if (initialValue == DBNull.Value)
{
if (ReflectionUtils.IsNullable(targetType))
return EnsureTypeAssignable(null, initialType, targetType);
throw new Exception("Can not convert null {0} into non-nullable {1}.".FormatWith(CultureInfo.InvariantCulture, initialType, targetType));
}
#if !SILVERLIGHT
if (initialValue is INullable)
return EnsureTypeAssignable(ToValue((INullable)initialValue), initialType, targetType);
#endif
throw new Exception("Can not convert from {0} to {1}.".FormatWith(CultureInfo.InvariantCulture, initialType, targetType));
}
#endregion
#region TryConvert
/// <summary>
/// Converts the value to the specified type.
/// </summary>
/// <typeparam name="T">The type to convert the value to.</typeparam>
/// <param name="initialValue">The value to convert.</param>
/// <param name="convertedValue">The converted value if the conversion was successful or the default value of <c>T</c> if it failed.</param>
/// <returns>
/// <c>true</c> if <c>initialValue</c> was converted successfully; otherwise, <c>false</c>.
/// </returns>
public static bool TryConvert<T>(object initialValue, out T convertedValue)
{
return TryConvert(initialValue, CultureInfo.CurrentCulture, out convertedValue);
}
/// <summary>
/// Converts the value to the specified type.
/// </summary>
/// <typeparam name="T">The type to convert the value to.</typeparam>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <param name="convertedValue">The converted value if the conversion was successful or the default value of <c>T</c> if it failed.</param>
/// <returns>
/// <c>true</c> if <c>initialValue</c> was converted successfully; otherwise, <c>false</c>.
/// </returns>
public static bool TryConvert<T>(object initialValue, CultureInfo culture, out T convertedValue)
{
return MiscellaneousUtils.TryAction<T>(delegate
{
object tempConvertedValue;
TryConvert(initialValue, CultureInfo.CurrentCulture, typeof(T), out tempConvertedValue);
return (T)tempConvertedValue;
}, out convertedValue);
}
/// <summary>
/// Converts the value to the specified type.
/// </summary>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <param name="targetType">The type to convert the value to.</param>
/// <param name="convertedValue">The converted value if the conversion was successful or the default value of <c>T</c> if it failed.</param>
/// <returns>
/// <c>true</c> if <c>initialValue</c> was converted successfully; otherwise, <c>false</c>.
/// </returns>
public static bool TryConvert(object initialValue, CultureInfo culture, Type targetType, out object convertedValue)
{
return MiscellaneousUtils.TryAction<object>(delegate { return Convert(initialValue, culture, targetType); }, out convertedValue);
}
#endregion
#region ConvertOrCast
/// <summary>
/// Converts the value to the specified type. If the value is unable to be converted, the
/// value is checked whether it assignable to the specified type.
/// </summary>
/// <typeparam name="T">The type to convert or cast the value to.</typeparam>
/// <param name="initialValue">The value to convert.</param>
/// <returns>The converted type. If conversion was unsuccessful, the initial value is returned if assignable to the target type</returns>
public static T ConvertOrCast<T>(object initialValue)
{
return ConvertOrCast<T>(initialValue, CultureInfo.CurrentCulture);
}
/// <summary>
/// Converts the value to the specified type. If the value is unable to be converted, the
/// value is checked whether it assignable to the specified type.
/// </summary>
/// <typeparam name="T">The type to convert or cast the value to.</typeparam>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <returns>The converted type. If conversion was unsuccessful, the initial value is returned if assignable to the target type</returns>
public static T ConvertOrCast<T>(object initialValue, CultureInfo culture)
{
return (T)ConvertOrCast(initialValue, culture, typeof(T));
}
/// <summary>
/// Converts the value to the specified type. If the value is unable to be converted, the
/// value is checked whether it assignable to the specified type.
/// </summary>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <param name="targetType">The type to convert or cast the value to.</param>
/// <returns>
/// The converted type. If conversion was unsuccessful, the initial value
/// is returned if assignable to the target type.
/// </returns>
public static object ConvertOrCast(object initialValue, CultureInfo culture, Type targetType)
{
object convertedValue;
if (targetType == typeof(object))
return initialValue;
if (initialValue == null && ReflectionUtils.IsNullable(targetType))
return null;
if (TryConvert(initialValue, culture, targetType, out convertedValue))
return convertedValue;
return EnsureTypeAssignable(initialValue, ReflectionUtils.GetObjectType(initialValue), targetType);
}
#endregion
#region TryConvertOrCast
/// <summary>
/// Converts the value to the specified type. If the value is unable to be converted, the
/// value is checked whether it assignable to the specified type.
/// </summary>
/// <typeparam name="T">The type to convert the value to.</typeparam>
/// <param name="initialValue">The value to convert.</param>
/// <param name="convertedValue">The converted value if the conversion was successful or the default value of <c>T</c> if it failed.</param>
/// <returns>
/// <c>true</c> if <c>initialValue</c> was converted successfully or is assignable; otherwise, <c>false</c>.
/// </returns>
public static bool TryConvertOrCast<T>(object initialValue, out T convertedValue)
{
return TryConvertOrCast<T>(initialValue, CultureInfo.CurrentCulture, out convertedValue);
}
/// <summary>
/// Converts the value to the specified type. If the value is unable to be converted, the
/// value is checked whether it assignable to the specified type.
/// </summary>
/// <typeparam name="T">The type to convert the value to.</typeparam>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <param name="convertedValue">The converted value if the conversion was successful or the default value of <c>T</c> if it failed.</param>
/// <returns>
/// <c>true</c> if <c>initialValue</c> was converted successfully or is assignable; otherwise, <c>false</c>.
/// </returns>
public static bool TryConvertOrCast<T>(object initialValue, CultureInfo culture, out T convertedValue)
{
return MiscellaneousUtils.TryAction<T>(delegate
{
object tempConvertedValue;
TryConvertOrCast(initialValue, CultureInfo.CurrentCulture, typeof(T), out tempConvertedValue);
return (T)tempConvertedValue;
}, out convertedValue);
}
/// <summary>
/// Converts the value to the specified type. If the value is unable to be converted, the
/// value is checked whether it assignable to the specified type.
/// </summary>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <param name="targetType">The type to convert the value to.</param>
/// <param name="convertedValue">The converted value if the conversion was successful or the default value of <c>T</c> if it failed.</param>
/// <returns>
/// <c>true</c> if <c>initialValue</c> was converted successfully or is assignable; otherwise, <c>false</c>.
/// </returns>
public static bool TryConvertOrCast(object initialValue, CultureInfo culture, Type targetType, out object convertedValue)
{
return MiscellaneousUtils.TryAction<object>(delegate { return ConvertOrCast(initialValue, culture, targetType); }, out convertedValue);
}
#endregion
private static object EnsureTypeAssignable(object value, Type initialType, Type targetType)
{
Type valueType = (value != null) ? value.GetType() : null;
if (value != null)
{
if (targetType.IsAssignableFrom(valueType))
return value;
Func<object, object> castConverter = CastConverters.Get(new TypeConvertKey(valueType, targetType));
if (castConverter != null)
return castConverter(value);
}
else
{
if (ReflectionUtils.IsNullable(targetType))
return null;
}
throw new Exception("Could not cast or convert from {0} to {1}.".FormatWith(CultureInfo.InvariantCulture, (initialType != null) ? initialType.ToString() : "{null}", targetType));
}
#if !SILVERLIGHT
public static object ToValue(INullable nullableValue)
{
if (nullableValue == null)
return null;
else if (nullableValue is SqlInt32)
return ToValue((SqlInt32)nullableValue);
else if (nullableValue is SqlInt64)
return ToValue((SqlInt64)nullableValue);
else if (nullableValue is SqlBoolean)
return ToValue((SqlBoolean)nullableValue);
else if (nullableValue is SqlString)
return ToValue((SqlString)nullableValue);
else if (nullableValue is SqlDateTime)
return ToValue((SqlDateTime)nullableValue);
throw new Exception("Unsupported INullable type: {0}".FormatWith(CultureInfo.InvariantCulture, nullableValue.GetType()));
}
#endif
#if !PocketPC
internal static TypeConverter GetConverter(Type t)
{
return JsonTypeReflector.GetTypeConverter(t);
}
#endif
public static bool IsInteger(object value)
{
switch (System.Convert.GetTypeCode(value))
{
case TypeCode.SByte:
case TypeCode.Byte:
case TypeCode.Int16:
case TypeCode.UInt16:
case TypeCode.Int32:
case TypeCode.UInt32:
case TypeCode.Int64:
case TypeCode.UInt64:
return true;
default:
return false;
}
}
}
}
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