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431 lines
14 KiB
C#
431 lines
14 KiB
C#
/*--------------------------------------------------------------------------
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* DynamicJson
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* ver 1.2.0.0 (May. 21th, 2010)
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*
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* created and maintained by neuecc <ils@neue.cc>
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* licensed under Microsoft Public License(Ms-PL)
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* http://neue.cc/
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* http://dynamicjson.codeplex.com/
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*--------------------------------------------------------------------------*/
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Dynamic;
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using System.IO;
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using System.Linq;
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using System.Reflection;
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using System.Runtime.Serialization.Json;
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using System.Text;
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using System.Xml;
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using System.Xml.Linq;
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namespace Codeplex.Data
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{
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public class DynamicJson : DynamicObject
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{
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private enum JsonType
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{
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@string, number, boolean, @object, array, @null
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}
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// public static methods
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/// <summary>from JsonSring to DynamicJson</summary>
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public static dynamic Parse(string json)
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{
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return Parse(json, Encoding.Unicode);
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}
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/// <summary>from JsonSring to DynamicJson</summary>
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public static dynamic Parse(string json, Encoding encoding)
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{
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using (var reader = JsonReaderWriterFactory.CreateJsonReader(encoding.GetBytes(json), XmlDictionaryReaderQuotas.Max))
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{
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return ToValue(XElement.Load(reader));
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}
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}
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/// <summary>from JsonSringStream to DynamicJson</summary>
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public static dynamic Parse(Stream stream)
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{
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using (var reader = JsonReaderWriterFactory.CreateJsonReader(stream, XmlDictionaryReaderQuotas.Max))
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{
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return ToValue(XElement.Load(reader));
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}
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}
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/// <summary>from JsonSringStream to DynamicJson</summary>
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public static dynamic Parse(Stream stream, Encoding encoding)
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{
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using (var reader = JsonReaderWriterFactory.CreateJsonReader(stream, encoding, XmlDictionaryReaderQuotas.Max, _ => { }))
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{
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return ToValue(XElement.Load(reader));
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}
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}
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/// <summary>create JsonSring from primitive or IEnumerable or Object({public property name:property value})</summary>
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public static string Serialize(object obj)
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{
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return CreateJsonString(new XStreamingElement("root", CreateTypeAttr(GetJsonType(obj)), CreateJsonNode(obj)));
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}
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// private static methods
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private static dynamic ToValue(XElement element)
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{
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var type = (JsonType)Enum.Parse(typeof(JsonType), element.Attribute("type").Value);
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switch (type)
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{
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case JsonType.boolean:
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return (bool)element;
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case JsonType.number:
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return (double)element;
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case JsonType.@string:
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return (string)element;
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case JsonType.@object:
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case JsonType.array:
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return new DynamicJson(element, type);
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case JsonType.@null:
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default:
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return null;
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}
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}
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private static JsonType GetJsonType(object obj)
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{
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if (obj == null) return JsonType.@null;
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switch (Type.GetTypeCode(obj.GetType()))
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{
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case TypeCode.Boolean:
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return JsonType.boolean;
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case TypeCode.String:
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case TypeCode.Char:
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case TypeCode.DateTime:
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return JsonType.@string;
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case TypeCode.Int16:
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case TypeCode.Int32:
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case TypeCode.Int64:
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case TypeCode.UInt16:
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case TypeCode.UInt32:
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case TypeCode.UInt64:
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case TypeCode.Single:
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case TypeCode.Double:
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case TypeCode.Decimal:
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case TypeCode.SByte:
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case TypeCode.Byte:
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return JsonType.number;
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case TypeCode.Object:
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return (obj is IEnumerable) ? JsonType.array : JsonType.@object;
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case TypeCode.DBNull:
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case TypeCode.Empty:
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default:
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return JsonType.@null;
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}
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}
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private static XAttribute CreateTypeAttr(JsonType type)
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{
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return new XAttribute("type", type.ToString());
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}
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private static object CreateJsonNode(object obj)
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{
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var type = GetJsonType(obj);
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switch (type)
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{
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case JsonType.@string:
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case JsonType.number:
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return obj;
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case JsonType.boolean:
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return obj.ToString().ToLower();
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case JsonType.@object:
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return CreateXObject(obj);
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case JsonType.array:
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return CreateXArray(obj as IEnumerable);
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case JsonType.@null:
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default:
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return null;
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}
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}
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private static IEnumerable<XStreamingElement> CreateXArray<T>(T obj) where T : IEnumerable
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{
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return obj.Cast<object>()
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.Select(o => new XStreamingElement("item", CreateTypeAttr(GetJsonType(o)), CreateJsonNode(o)));
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}
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private static IEnumerable<XStreamingElement> CreateXObject(object obj)
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{
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return obj.GetType()
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.GetProperties(BindingFlags.Public | BindingFlags.Instance)
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.Select(pi => new { Name = pi.Name, Value = pi.GetValue(obj, null) })
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.Select(a => new XStreamingElement(a.Name, CreateTypeAttr(GetJsonType(a.Value)), CreateJsonNode(a.Value)));
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}
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private static string CreateJsonString(XStreamingElement element)
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{
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using (var ms = new MemoryStream())
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using (var writer = JsonReaderWriterFactory.CreateJsonWriter(ms, Encoding.Unicode))
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{
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element.WriteTo(writer);
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writer.Flush();
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return Encoding.Unicode.GetString(ms.ToArray());
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}
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}
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// dynamic structure represents JavaScript Object/Array
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readonly XElement xml;
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readonly JsonType jsonType;
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/// <summary>create blank JSObject</summary>
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public DynamicJson()
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{
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xml = new XElement("root", CreateTypeAttr(JsonType.@object));
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jsonType = JsonType.@object;
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}
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private DynamicJson(XElement element, JsonType type)
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{
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Debug.Assert(type == JsonType.array || type == JsonType.@object);
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xml = element;
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jsonType = type;
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}
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public bool IsObject { get { return jsonType == JsonType.@object; } }
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public bool IsArray { get { return jsonType == JsonType.array; } }
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/// <summary>has property or not</summary>
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public bool IsDefined(string name)
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{
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return IsObject && (xml.Element(name) != null);
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}
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/// <summary>has property or not</summary>
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public bool IsDefined(int index)
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{
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return IsArray && (xml.Elements().ElementAtOrDefault(index) != null);
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}
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/// <summary>delete property</summary>
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public bool Delete(string name)
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{
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var elem = xml.Element(name);
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if (elem != null)
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{
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elem.Remove();
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return true;
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}
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else return false;
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}
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/// <summary>delete property</summary>
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public bool Delete(int index)
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{
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var elem = xml.Elements().ElementAtOrDefault(index);
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if (elem != null)
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{
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elem.Remove();
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return true;
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}
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else return false;
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}
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/// <summary>mapping to Array or Class by Public PropertyName</summary>
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public T Deserialize<T>()
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{
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return (T)Deserialize(typeof(T));
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}
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private object Deserialize(Type type)
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{
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return (IsArray) ? DeserializeArray(type) : DeserializeObject(type);
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}
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private dynamic DeserializeValue(XElement element, Type elementType)
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{
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var value = ToValue(element);
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if (value is DynamicJson)
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{
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value = ((DynamicJson)value).Deserialize(elementType);
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}
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return Convert.ChangeType(value, elementType);
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}
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private object DeserializeObject(Type targetType)
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{
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var result = Activator.CreateInstance(targetType);
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var dict = targetType.GetProperties(BindingFlags.Public | BindingFlags.Instance)
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.Where(p => p.CanWrite)
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.ToDictionary(pi => pi.Name, pi => pi);
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foreach (var item in xml.Elements())
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{
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PropertyInfo propertyInfo;
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if (!dict.TryGetValue(item.Name.LocalName, out propertyInfo)) continue;
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var value = DeserializeValue(item, propertyInfo.PropertyType);
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propertyInfo.SetValue(result, value, null);
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}
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return result;
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}
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private object DeserializeArray(Type targetType)
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{
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if (targetType.IsArray) // Foo[]
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{
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var elemType = targetType.GetElementType();
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dynamic array = Array.CreateInstance(elemType, xml.Elements().Count());
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var index = 0;
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foreach (var item in xml.Elements())
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{
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array[index++] = DeserializeValue(item, elemType);
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}
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return array;
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}
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else // List<Foo>
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{
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var elemType = targetType.GetGenericArguments()[0];
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dynamic list = Activator.CreateInstance(targetType);
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foreach (var item in xml.Elements())
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{
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list.Add(DeserializeValue(item, elemType));
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}
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return list;
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}
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}
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// Delete
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public override bool TryInvoke(InvokeBinder binder, object[] args, out object result)
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{
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result = (IsArray)
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? Delete((int)args[0])
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: Delete((string)args[0]);
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return true;
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}
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// IsDefined, if has args then TryGetMember
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public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
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{
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if (args.Length > 0)
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{
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result = null;
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return false;
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}
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result = IsDefined(binder.Name);
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return true;
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}
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// Deserialize or foreach(IEnumerable)
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public override bool TryConvert(ConvertBinder binder, out object result)
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{
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if (binder.Type == typeof(IEnumerable) || binder.Type == typeof(object[]))
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{
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var ie = (IsArray)
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? xml.Elements().Select(x => ToValue(x))
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: xml.Elements().Select(x => (dynamic)new KeyValuePair<string, object>(x.Name.LocalName, ToValue(x)));
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result = (binder.Type == typeof(object[])) ? ie.ToArray() : ie;
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}
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else
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{
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result = Deserialize(binder.Type);
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}
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return true;
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}
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private bool TryGet(XElement element, out object result)
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{
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if (element == null)
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{
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result = null;
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return false;
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}
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result = ToValue(element);
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return true;
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}
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public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result)
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{
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return (IsArray)
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? TryGet(xml.Elements().ElementAtOrDefault((int)indexes[0]), out result)
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: TryGet(xml.Element((string)indexes[0]), out result);
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}
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public override bool TryGetMember(GetMemberBinder binder, out object result)
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{
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return (IsArray)
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? TryGet(xml.Elements().ElementAtOrDefault(int.Parse(binder.Name)), out result)
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: TryGet(xml.Element(binder.Name), out result);
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}
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private bool TrySet(string name, object value)
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{
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var type = GetJsonType(value);
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var element = xml.Element(name);
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if (element == null)
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{
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xml.Add(new XElement(name, CreateTypeAttr(type), CreateJsonNode(value)));
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}
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else
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{
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element.Attribute("type").Value = type.ToString();
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element.ReplaceNodes(CreateJsonNode(value));
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}
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return true;
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}
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private bool TrySet(int index, object value)
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{
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var type = GetJsonType(value);
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var e = xml.Elements().ElementAtOrDefault(index);
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if (e == null)
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{
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xml.Add(new XElement("item", CreateTypeAttr(type), CreateJsonNode(value)));
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}
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else
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{
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e.Attribute("type").Value = type.ToString();
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e.ReplaceNodes(CreateJsonNode(value));
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}
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return true;
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}
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public override bool TrySetIndex(SetIndexBinder binder, object[] indexes, object value)
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{
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return (IsArray)
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? TrySet((int)indexes[0], value)
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: TrySet((string)indexes[0], value);
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}
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public override bool TrySetMember(SetMemberBinder binder, object value)
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{
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return (IsArray)
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? TrySet(int.Parse(binder.Name), value)
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: TrySet(binder.Name, value);
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}
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public override IEnumerable<string> GetDynamicMemberNames()
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{
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return (IsArray)
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? xml.Elements().Select((x, i) => i.ToString())
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: xml.Elements().Select(x => x.Name.LocalName);
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}
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/// <summary>Serialize to JsonString</summary>
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public override string ToString()
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{
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// <foo type="null"></foo> is can't serialize. replace to <foo type="null" />
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foreach (var elem in xml.Descendants().Where(x => x.Attribute("type").Value == "null"))
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{
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elem.RemoveNodes();
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}
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return CreateJsonString(new XStreamingElement("root", CreateTypeAttr(jsonType), xml.Elements()));
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}
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}
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} |