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Common/00-1Json8.3/Json8.3/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 Newtonsoft.Json.Utilities;
+#if NET20
+using Newtonsoft.Json.Utilities.LinqBridge;
+#else
+using System.Linq;
+
+#endif
+
+namespace 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.
+        /// </summary>
+        /// <value><c>true</c> if the written enum text will be camel case; otherwise, <c>false</c>.</value>
+        public bool CamelCaseText { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether integer values are allowed.
+        /// </summary>
+        /// <value><c>true</c> if integers are allowed; otherwise, <c>false</c>.</value>
+        public bool AllowIntegerValues { get; set; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="StringEnumConverter"/> class.
+        /// </summary>
+        public StringEnumConverter()
+        {
+            AllowIntegerValues = true;
+        }
+
+        /// <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>
+        public StringEnumConverter(bool camelCaseText)
+            : this()
+        {
+            CamelCaseText = camelCaseText;
+        }
+
+        /// <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)
+        {
+            if (value == null)
+            {
+                writer.WriteNull();
+                return;
+            }
+
+            Enum e = (Enum)value;
+
+            string enumName = e.ToString("G");
+
+            if (char.IsNumber(enumName[0]) || enumName[0] == '-')
+            {
+                // enum value has no name so write number
+                writer.WriteValue(value);
+            }
+            else
+            {
+                Type enumType = e.GetType();
+
+                string finalName = EnumUtils.ToEnumName(enumType, enumName, CamelCaseText);
+
+                writer.WriteValue(finalName);
+            }
+        }
+
+        /// <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)
+        {
+            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)
+                {
+                    string enumText = reader.Value.ToString();
+                    return EnumUtils.ParseEnumName(enumText, isNullable, t);
+                }
+
+                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.FormatValueForPrint(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();
+        }
+    }
+}