csharp-sdk-upm/Libs/Newtonsoft.Json/Converters/StringEnumConverter.cs

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#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.Globalization;
using System.Reflection;
using System.Runtime.Serialization;
using LC.Newtonsoft.Json.Utilities;
using LC.Newtonsoft.Json.Serialization;
#if !HAVE_LINQ
using LC.Newtonsoft.Json.Utilities.LinqBridge;
#else
using System.Linq;
#endif
namespace LC.Newtonsoft.Json.Converters
{
/// <summary>
/// Converts an <see cref="Enum"/> to and from its name string value.
/// </summary>
public class StringEnumConverter : JsonConverter
{
/// <summary>
/// Gets or sets a value indicating whether the written enum text should be camel case.
/// The default value is <c>false</c>.
/// </summary>
/// <value><c>true</c> if the written enum text will be camel case; otherwise, <c>false</c>.</value>
[Obsolete("StringEnumConverter.CamelCaseText is obsolete. Set StringEnumConverter.NamingStrategy with CamelCaseNamingStrategy instead.")]
public bool CamelCaseText
{
get => NamingStrategy is CamelCaseNamingStrategy ? true : false;
set
{
if (value)
{
if (NamingStrategy is CamelCaseNamingStrategy)
{
return;
}
NamingStrategy = new CamelCaseNamingStrategy();
}
else
{
if (!(NamingStrategy is CamelCaseNamingStrategy))
{
return;
}
NamingStrategy = null;
}
}
}
/// <summary>
/// Gets or sets the naming strategy used to resolve how enum text is written.
/// </summary>
/// <value>The naming strategy used to resolve how enum text is written.</value>
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public NamingStrategy NamingStrategy { get; set; }
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/// <summary>
/// Gets or sets a value indicating whether integer values are allowed when serializing and deserializing.
/// The default value is <c>true</c>.
/// </summary>
/// <value><c>true</c> if integers are allowed when serializing and deserializing; otherwise, <c>false</c>.</value>
public bool AllowIntegerValues { get; set; } = true;
/// <summary>
/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
/// </summary>
public StringEnumConverter()
{
}
/// <summary>
/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
/// </summary>
/// <param name="camelCaseText"><c>true</c> if the written enum text will be camel case; otherwise, <c>false</c>.</param>
[Obsolete("StringEnumConverter(bool) is obsolete. Create a converter with StringEnumConverter(NamingStrategy, bool) instead.")]
public StringEnumConverter(bool camelCaseText)
{
if (camelCaseText)
{
NamingStrategy = new CamelCaseNamingStrategy();
}
}
/// <summary>
/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
/// </summary>
/// <param name="namingStrategy">The naming strategy used to resolve how enum text is written.</param>
/// <param name="allowIntegerValues"><c>true</c> if integers are allowed when serializing and deserializing; otherwise, <c>false</c>.</param>
public StringEnumConverter(NamingStrategy namingStrategy, bool allowIntegerValues = true)
{
NamingStrategy = namingStrategy;
AllowIntegerValues = allowIntegerValues;
}
/// <summary>
/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
/// </summary>
/// <param name="namingStrategyType">The <see cref="System.Type"/> of the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> used to write enum text.</param>
public StringEnumConverter(Type namingStrategyType)
{
ValidationUtils.ArgumentNotNull(namingStrategyType, nameof(namingStrategyType));
NamingStrategy = JsonTypeReflector.CreateNamingStrategyInstance(namingStrategyType, null);
}
/// <summary>
/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
/// </summary>
/// <param name="namingStrategyType">The <see cref="System.Type"/> of the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> used to write enum text.</param>
/// <param name="namingStrategyParameters">
/// The parameter list to use when constructing the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> described by <paramref name="namingStrategyType"/>.
/// If <c>null</c>, the default constructor is used.
/// When non-<c>null</c>, there must be a constructor defined in the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> that exactly matches the number,
/// order, and type of these parameters.
/// </param>
public StringEnumConverter(Type namingStrategyType, object[] namingStrategyParameters)
{
ValidationUtils.ArgumentNotNull(namingStrategyType, nameof(namingStrategyType));
NamingStrategy = JsonTypeReflector.CreateNamingStrategyInstance(namingStrategyType, namingStrategyParameters);
}
/// <summary>
/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
/// </summary>
/// <param name="namingStrategyType">The <see cref="System.Type"/> of the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> used to write enum text.</param>
/// <param name="namingStrategyParameters">
/// The parameter list to use when constructing the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> described by <paramref name="namingStrategyType"/>.
/// If <c>null</c>, the default constructor is used.
/// When non-<c>null</c>, there must be a constructor defined in the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> that exactly matches the number,
/// order, and type of these parameters.
/// </param>
/// <param name="allowIntegerValues"><c>true</c> if integers are allowed when serializing and deserializing; otherwise, <c>false</c>.</param>
public StringEnumConverter(Type namingStrategyType, object[] namingStrategyParameters, bool allowIntegerValues)
{
ValidationUtils.ArgumentNotNull(namingStrategyType, nameof(namingStrategyType));
NamingStrategy = JsonTypeReflector.CreateNamingStrategyInstance(namingStrategyType, namingStrategyParameters);
AllowIntegerValues = allowIntegerValues;
}
/// <summary>
/// Writes the JSON representation of the object.
/// </summary>
/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
/// <param name="value">The value.</param>
/// <param name="serializer">The calling serializer.</param>
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public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
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{
if (value == null)
{
writer.WriteNull();
return;
}
Enum e = (Enum)value;
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if (!EnumUtils.TryToString(e.GetType(), value, NamingStrategy, out string enumName))
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{
if (!AllowIntegerValues)
{
throw JsonSerializationException.Create(null, writer.ContainerPath, "Integer value {0} is not allowed.".FormatWith(CultureInfo.InvariantCulture, e.ToString("D")), null);
}
// enum value has no name so write number
writer.WriteValue(value);
}
else
{
writer.WriteValue(enumName);
}
}
/// <summary>
/// Reads the JSON representation of the object.
/// </summary>
/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
/// <param name="objectType">Type of the object.</param>
/// <param name="existingValue">The existing value of object being read.</param>
/// <param name="serializer">The calling serializer.</param>
/// <returns>The object value.</returns>
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public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
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{
if (reader.TokenType == JsonToken.Null)
{
if (!ReflectionUtils.IsNullableType(objectType))
{
throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
}
return null;
}
bool isNullable = ReflectionUtils.IsNullableType(objectType);
Type t = isNullable ? Nullable.GetUnderlyingType(objectType) : objectType;
try
{
if (reader.TokenType == JsonToken.String)
{
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string enumText = reader.Value.ToString();
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if (enumText == string.Empty && isNullable)
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{
return null;
}
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return EnumUtils.ParseEnum(t, NamingStrategy, enumText, !AllowIntegerValues);
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}
if (reader.TokenType == JsonToken.Integer)
{
if (!AllowIntegerValues)
{
throw JsonSerializationException.Create(reader, "Integer value {0} is not allowed.".FormatWith(CultureInfo.InvariantCulture, reader.Value));
}
return ConvertUtils.ConvertOrCast(reader.Value, CultureInfo.InvariantCulture, t);
}
}
catch (Exception ex)
{
throw JsonSerializationException.Create(reader, "Error converting value {0} to type '{1}'.".FormatWith(CultureInfo.InvariantCulture, MiscellaneousUtils.ToString(reader.Value), objectType), ex);
}
// we don't actually expect to get here.
throw JsonSerializationException.Create(reader, "Unexpected token {0} when parsing enum.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
}
/// <summary>
/// Determines whether this instance can convert the specified object type.
/// </summary>
/// <param name="objectType">Type of the object.</param>
/// <returns>
/// <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
/// </returns>
public override bool CanConvert(Type objectType)
{
Type t = (ReflectionUtils.IsNullableType(objectType))
? Nullable.GetUnderlyingType(objectType)
: objectType;
return t.IsEnum();
}
}
}