149 lines
7.0 KiB
C#
149 lines
7.0 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 LC.Newtonsoft.Json.Utilities;
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using System.Globalization;
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using System.Runtime.CompilerServices;
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using System.Diagnostics.CodeAnalysis;
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namespace LC.Newtonsoft.Json
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{
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/// <summary>
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/// Converts an object to and from JSON.
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/// </summary>
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public abstract class JsonConverter
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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 abstract void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer);
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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 abstract object? ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer);
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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 abstract bool CanConvert(Type objectType);
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/// <summary>
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/// Gets a value indicating whether this <see cref="JsonConverter"/> can read JSON.
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/// </summary>
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/// <value><c>true</c> if this <see cref="JsonConverter"/> can read JSON; otherwise, <c>false</c>.</value>
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public virtual bool CanRead => true;
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/// <summary>
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/// Gets a value indicating whether this <see cref="JsonConverter"/> can write JSON.
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/// </summary>
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/// <value><c>true</c> if this <see cref="JsonConverter"/> can write JSON; otherwise, <c>false</c>.</value>
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public virtual bool CanWrite => true;
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}
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/// <summary>
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/// Converts an object to and from JSON.
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/// </summary>
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/// <typeparam name="T">The object type to convert.</typeparam>
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public abstract class JsonConverter<T> : JsonConverter
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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 sealed override void WriteJson(JsonWriter writer, object? value, JsonSerializer serializer)
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{
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if (!(value != null ? value is T : ReflectionUtils.IsNullable(typeof(T))))
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{
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throw new JsonSerializationException("Converter cannot write specified value to JSON. {0} is required.".FormatWith(CultureInfo.InvariantCulture, typeof(T)));
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}
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WriteJson(writer, (T?)value, serializer);
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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 abstract void WriteJson(JsonWriter writer, T? value, JsonSerializer serializer);
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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 sealed override object? ReadJson(JsonReader reader, Type objectType, object? existingValue, JsonSerializer serializer)
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{
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bool existingIsNull = existingValue == null;
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if (!(existingIsNull || existingValue is T))
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{
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throw new JsonSerializationException("Converter cannot read JSON with the specified existing value. {0} is required.".FormatWith(CultureInfo.InvariantCulture, typeof(T)));
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}
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return ReadJson(reader, objectType, existingIsNull ? default : (T?)existingValue, !existingIsNull, serializer);
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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. If there is no existing value then <c>null</c> will be used.</param>
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/// <param name="hasExistingValue">The existing value has a value.</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 abstract T? ReadJson(JsonReader reader, Type objectType, T? existingValue, bool hasExistingValue, JsonSerializer serializer);
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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 sealed override bool CanConvert(Type objectType)
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{
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return typeof(T).IsAssignableFrom(objectType);
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}
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}
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}
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