277 lines
12 KiB
C#
277 lines
12 KiB
C#
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#region License
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// Copyright (c) 2007 James Newton-King
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the "Software"), to deal in the Software without
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// restriction, including without limitation the rights to use,
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// copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following
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// conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Reflection;
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using System.Runtime.Serialization;
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using LC.Newtonsoft.Json.Utilities;
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using LC.Newtonsoft.Json.Serialization;
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#if !HAVE_LINQ
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using LC.Newtonsoft.Json.Utilities.LinqBridge;
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#else
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using System.Linq;
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#endif
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namespace LC.Newtonsoft.Json.Converters
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{
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/// <summary>
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/// Converts an <see cref="Enum"/> to and from its name string value.
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/// </summary>
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public class StringEnumConverter : JsonConverter
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{
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/// <summary>
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/// Gets or sets a value indicating whether the written enum text should be camel case.
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/// The default value is <c>false</c>.
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/// </summary>
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/// <value><c>true</c> if the written enum text will be camel case; otherwise, <c>false</c>.</value>
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[Obsolete("StringEnumConverter.CamelCaseText is obsolete. Set StringEnumConverter.NamingStrategy with CamelCaseNamingStrategy instead.")]
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public bool CamelCaseText
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{
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get => NamingStrategy is CamelCaseNamingStrategy ? true : false;
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set
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{
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if (value)
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{
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if (NamingStrategy is CamelCaseNamingStrategy)
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{
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return;
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}
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NamingStrategy = new CamelCaseNamingStrategy();
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}
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else
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{
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if (!(NamingStrategy is CamelCaseNamingStrategy))
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{
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return;
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}
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NamingStrategy = null;
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}
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}
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}
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/// <summary>
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/// Gets or sets the naming strategy used to resolve how enum text is written.
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/// </summary>
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/// <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>
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/// Gets or sets a value indicating whether integer values are allowed when serializing and deserializing.
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/// The default value is <c>true</c>.
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/// </summary>
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/// <value><c>true</c> if integers are allowed when serializing and deserializing; otherwise, <c>false</c>.</value>
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public bool AllowIntegerValues { get; set; } = true;
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/// <summary>
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/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
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/// </summary>
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public StringEnumConverter()
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{
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
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/// </summary>
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/// <param name="camelCaseText"><c>true</c> if the written enum text will be camel case; otherwise, <c>false</c>.</param>
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[Obsolete("StringEnumConverter(bool) is obsolete. Create a converter with StringEnumConverter(NamingStrategy, bool) instead.")]
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public StringEnumConverter(bool camelCaseText)
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{
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if (camelCaseText)
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{
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NamingStrategy = new CamelCaseNamingStrategy();
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}
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
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/// </summary>
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/// <param name="namingStrategy">The naming strategy used to resolve how enum text is written.</param>
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/// <param name="allowIntegerValues"><c>true</c> if integers are allowed when serializing and deserializing; otherwise, <c>false</c>.</param>
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public StringEnumConverter(NamingStrategy namingStrategy, bool allowIntegerValues = true)
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{
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NamingStrategy = namingStrategy;
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AllowIntegerValues = allowIntegerValues;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
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/// </summary>
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/// <param name="namingStrategyType">The <see cref="System.Type"/> of the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> used to write enum text.</param>
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public StringEnumConverter(Type namingStrategyType)
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{
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ValidationUtils.ArgumentNotNull(namingStrategyType, nameof(namingStrategyType));
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NamingStrategy = JsonTypeReflector.CreateNamingStrategyInstance(namingStrategyType, null);
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
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/// </summary>
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/// <param name="namingStrategyType">The <see cref="System.Type"/> of the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> used to write enum text.</param>
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/// <param name="namingStrategyParameters">
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/// The parameter list to use when constructing the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> described by <paramref name="namingStrategyType"/>.
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/// If <c>null</c>, the default constructor is used.
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/// When non-<c>null</c>, there must be a constructor defined in the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> that exactly matches the number,
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/// order, and type of these parameters.
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/// </param>
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public StringEnumConverter(Type namingStrategyType, object[] namingStrategyParameters)
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{
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ValidationUtils.ArgumentNotNull(namingStrategyType, nameof(namingStrategyType));
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NamingStrategy = JsonTypeReflector.CreateNamingStrategyInstance(namingStrategyType, namingStrategyParameters);
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
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/// </summary>
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/// <param name="namingStrategyType">The <see cref="System.Type"/> of the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> used to write enum text.</param>
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/// <param name="namingStrategyParameters">
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/// The parameter list to use when constructing the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> described by <paramref name="namingStrategyType"/>.
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/// If <c>null</c>, the default constructor is used.
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/// When non-<c>null</c>, there must be a constructor defined in the <see cref="Newtonsoft.Json.Serialization.NamingStrategy"/> that exactly matches the number,
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/// order, and type of these parameters.
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/// </param>
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/// <param name="allowIntegerValues"><c>true</c> if integers are allowed when serializing and deserializing; otherwise, <c>false</c>.</param>
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public StringEnumConverter(Type namingStrategyType, object[] namingStrategyParameters, bool allowIntegerValues)
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{
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ValidationUtils.ArgumentNotNull(namingStrategyType, nameof(namingStrategyType));
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NamingStrategy = JsonTypeReflector.CreateNamingStrategyInstance(namingStrategyType, namingStrategyParameters);
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AllowIntegerValues = allowIntegerValues;
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}
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/// <summary>
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/// Writes the JSON representation of the object.
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/// </summary>
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/// <param name="writer">The <see cref="JsonWriter"/> to write to.</param>
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/// <param name="value">The value.</param>
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/// <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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{
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if (value == null)
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{
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writer.WriteNull();
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return;
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}
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Enum e = (Enum)value;
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if (!EnumUtils.TryToString(e.GetType(), value, NamingStrategy, out string? enumName))
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{
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if (!AllowIntegerValues)
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{
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throw JsonSerializationException.Create(null, writer.ContainerPath, "Integer value {0} is not allowed.".FormatWith(CultureInfo.InvariantCulture, e.ToString("D")), null);
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}
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// enum value has no name so write number
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writer.WriteValue(value);
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}
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else
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{
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writer.WriteValue(enumName);
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}
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}
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/// <summary>
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/// Reads the JSON representation of the object.
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/// </summary>
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/// <param name="reader">The <see cref="JsonReader"/> to read from.</param>
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/// <param name="objectType">Type of the object.</param>
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/// <param name="existingValue">The existing value of object being read.</param>
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/// <param name="serializer">The calling serializer.</param>
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/// <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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{
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if (reader.TokenType == JsonToken.Null)
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{
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if (!ReflectionUtils.IsNullableType(objectType))
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{
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throw JsonSerializationException.Create(reader, "Cannot convert null value to {0}.".FormatWith(CultureInfo.InvariantCulture, objectType));
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}
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return null;
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}
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bool isNullable = ReflectionUtils.IsNullableType(objectType);
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Type t = isNullable ? Nullable.GetUnderlyingType(objectType) : objectType;
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try
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{
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if (reader.TokenType == JsonToken.String)
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{
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string? enumText = reader.Value?.ToString();
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if (StringUtils.IsNullOrEmpty(enumText) && isNullable)
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{
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return null;
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}
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return EnumUtils.ParseEnum(t, NamingStrategy, enumText!, !AllowIntegerValues);
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}
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if (reader.TokenType == JsonToken.Integer)
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{
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if (!AllowIntegerValues)
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{
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throw JsonSerializationException.Create(reader, "Integer value {0} is not allowed.".FormatWith(CultureInfo.InvariantCulture, reader.Value));
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}
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return ConvertUtils.ConvertOrCast(reader.Value, CultureInfo.InvariantCulture, t);
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}
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}
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catch (Exception ex)
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{
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throw JsonSerializationException.Create(reader, "Error converting value {0} to type '{1}'.".FormatWith(CultureInfo.InvariantCulture, MiscellaneousUtils.ToString(reader.Value), objectType), ex);
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}
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// we don't actually expect to get here.
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throw JsonSerializationException.Create(reader, "Unexpected token {0} when parsing enum.".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
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}
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/// <summary>
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/// Determines whether this instance can convert the specified object type.
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/// </summary>
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/// <param name="objectType">Type of the object.</param>
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/// <returns>
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/// <c>true</c> if this instance can convert the specified object type; otherwise, <c>false</c>.
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/// </returns>
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public override bool CanConvert(Type objectType)
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{
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Type t = (ReflectionUtils.IsNullableType(objectType))
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? Nullable.GetUnderlyingType(objectType)
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: objectType;
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return t.IsEnum();
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}
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}
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}
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