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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 Newtonsoft.Json.Serialization;
using Newtonsoft.Json.Utilities;
using System.Reflection;
namespace Newtonsoft.Json.Converters
{
/// <summary>
/// Converts a <see cref="KeyValuePair{TKey,TValue}"/> to and from JSON.
/// </summary>
public class KeyValuePairConverter : JsonConverter
{
private const string KeyName = "Key";
private const string ValueName = "Value";
/// <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>
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
Type t = value.GetType();
PropertyInfo keyProperty = t.GetProperty(KeyName);
PropertyInfo valueProperty = t.GetProperty(ValueName);
DefaultContractResolver resolver = serializer.ContractResolver as DefaultContractResolver;
writer.WriteStartObject();
writer.WritePropertyName((resolver != null) ? resolver.GetResolvedPropertyName(KeyName) : KeyName);
serializer.Serialize(writer, ReflectionUtils.GetMemberValue(keyProperty, value));
writer.WritePropertyName((resolver != null) ? resolver.GetResolvedPropertyName(ValueName) : ValueName);
serializer.Serialize(writer, ReflectionUtils.GetMemberValue(valueProperty, value));
writer.WriteEndObject();
}
/// <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>
public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
{
bool isNullable = ReflectionUtils.IsNullableType(objectType);
if (reader.TokenType == JsonToken.Null)
{
if (!isNullable)
throw JsonSerializationException.Create(reader, "Cannot convert null value to KeyValuePair.");
return null;
}
Type t = (isNullable)
? Nullable.GetUnderlyingType(objectType)
: objectType;
IList<Type> genericArguments = t.GetGenericArguments();
Type keyType = genericArguments[0];
Type valueType = genericArguments[1];
object key = null;
object value = null;
reader.Read();
while (reader.TokenType == JsonToken.PropertyName)
{
string propertyName = reader.Value.ToString();
if (string.Equals(propertyName, KeyName, StringComparison.OrdinalIgnoreCase))
{
reader.Read();
key = serializer.Deserialize(reader, keyType);
}
else if (string.Equals(propertyName, ValueName, StringComparison.OrdinalIgnoreCase))
{
reader.Read();
value = serializer.Deserialize(reader, valueType);
}
else
{
reader.Skip();
}
reader.Read();
}
return ReflectionUtils.CreateInstance(t, key, value);
}
/// <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;
if (t.IsValueType() && t.IsGenericType())
return (t.GetGenericTypeDefinition() == typeof(KeyValuePair<,>));
return false;
}
}
}
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