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//
// JsonSerializationWriter.cs
//
// Author:
// Atsushi Enomoto <atsushi@ximian.com>
//
// Copyright (C) 2008 Novell, Inc (http://www.novell.com)
//
// 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.
//
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Text;
using System.Xml;
namespace System.Runtime.Serialization.Json
{
class JsonSerializationWriter
{
DataContractJsonSerializer serializer;
XmlWriter writer;
int serialized_object_count;
bool always_emit_type;
Dictionary<Type, TypeMap> typemaps = new Dictionary<Type, TypeMap> ();
Type root_type;
public JsonSerializationWriter (DataContractJsonSerializer serializer, XmlWriter writer, Type rootType, bool alwaysEmitTypeInformation)
{
this.serializer = serializer;
this.writer = writer;
this.root_type = rootType;
this.always_emit_type = alwaysEmitTypeInformation;
}
public XmlWriter Writer {
get { return writer; }
}
public void WriteObjectContent (object graph, bool top, bool outputTypeName)
{
if (graph == null) {
if (top)
GetTypeMap (root_type); // to make sure to reject invalid contracts
writer.WriteAttributeString ("type", "null");
writer.WriteString (null);
return;
}
if (serialized_object_count ++ == serializer.MaxItemsInObjectGraph)
throw new SerializationException (String.Format ("The object graph exceeded the maximum object count '{0}' specified in the serializer", serializer.MaxItemsInObjectGraph));
var type = graph.GetType ();
if (type.IsGenericType && type.GetGenericTypeDefinition () == typeof (Nullable<>))
type = type.GetGenericArguments () [0];
switch (Type.GetTypeCode (type)) {
case TypeCode.Char:
case TypeCode.String:
writer.WriteString (graph.ToString ());
break;
case TypeCode.Single:
case TypeCode.Double:
writer.WriteAttributeString ("type", "number");
writer.WriteString (((IFormattable) graph).ToString ("R", CultureInfo.InvariantCulture));
break;
case TypeCode.Byte:
case TypeCode.SByte:
case TypeCode.Int16:
case TypeCode.Int32:
case TypeCode.Int64:
case TypeCode.UInt16:
case TypeCode.UInt32:
case TypeCode.UInt64:
case TypeCode.Decimal:
writer.WriteAttributeString ("type", "number");
if (type.IsEnum)
graph = ((IConvertible) graph).ToType (Enum.GetUnderlyingType (type), CultureInfo.InvariantCulture);
writer.WriteString (((IFormattable) graph).ToString ("G", CultureInfo.InvariantCulture));
break;
case TypeCode.Boolean:
writer.WriteAttributeString ("type", "boolean");
if ((bool) graph)
writer.WriteString ("true");
else
writer.WriteString ("false");
break;
case TypeCode.DateTime:
writer.WriteString (String.Format (CultureInfo.InvariantCulture, "/Date({0})/", (long) ((DateTime) graph).Subtract (new DateTime (1970, 1, 1)).TotalMilliseconds));
break;
default:
if (graph is Guid) {
goto case TypeCode.String;
} else if (graph is Uri) {
goto case TypeCode.String;
} else if (graph is XmlQualifiedName) {
XmlQualifiedName qn = (XmlQualifiedName) graph;
writer.WriteString (qn.Name);
writer.WriteString (":");
writer.WriteString (qn.Namespace);
} else if (TypeMap.IsDictionary (type)) {
writer.WriteAttributeString ("type", "array");
bool otn = !(graph is Array && type.GetElementType () != typeof (object));
var d = graph as IDictionary;
if (d != null) {
// Optimize the IDictionary case to avoid reflection
foreach (object k in d.Keys)
WriteItem (k, d [k], otn);
} else {
// we can't typecast to IDictionary<,> and can't use dynamic for iOS support
var itemGetter = GetDictionaryProperty (type, "Item");
var keysGetter = GetDictionaryProperty (type, "Keys");
var argarr = new object [1];
foreach (object o in (IEnumerable) keysGetter.GetValue (graph, null)) {
argarr [0] = o;
WriteItem (o, itemGetter.GetValue (graph, argarr), otn);
}
}
} else if (graph is Array || TypeMap.IsEnumerable (type)) {
writer.WriteAttributeString ("type", "array");
foreach (object o in (IEnumerable) graph) {
writer.WriteStartElement ("item");
// when it is typed, then no need to output "__type"
WriteObjectContent (o, false, !(graph is Array && type.GetElementType () != typeof (object)));
writer.WriteEndElement ();
}
} else { // object
TypeMap tm = GetTypeMap (type);
if (tm != null) {
// FIXME: I'm not sure how it is determined whether __type is written or not...
if (outputTypeName || always_emit_type)
writer.WriteAttributeString ("__type", FormatTypeName (type));
tm.Serialize (this, graph, "object");
}
else
// it does not emit type="object" (as the graph is regarded as a string)
// writer.WriteString (graph.ToString ());
throw new InvalidDataContractException (String.Format ("Type {0} cannot be serialized by this JSON serializer", type));
}
break;
}
}
void WriteItem (object key, object value, bool outputTypeName)
{
writer.WriteStartElement ("item");
writer.WriteAttributeString ("type", "object");
// outputting a KeyValuePair as <Key .. /><Value ... />
writer.WriteStartElement ("Key");
WriteObjectContent (key, false, outputTypeName);
writer.WriteEndElement ();
writer.WriteStartElement ("Value");
WriteObjectContent (value, false, outputTypeName);
writer.WriteEndElement ();
writer.WriteEndElement ();
}
PropertyInfo GetDictionaryProperty (Type type, string propertyName)
{
var p = type.GetProperty (propertyName);
if (p != null)
return p;
// check explicit - but the generic names might differ, e.g. TKey,TValue vs T,V
var ap = type.GetProperties (BindingFlags.Instance | BindingFlags.NonPublic);
foreach (var cp in ap) {
if (!cp.Name.EndsWith (propertyName, StringComparison.Ordinal))
continue;
if (cp.Name.StartsWith ("System.Collections.Generic.IDictionary<", StringComparison.Ordinal))
return cp;
}
return null;
}
string FormatTypeName (Type type)
{
return String.Format ("{0}:#{1}", type.Name, type.Namespace);
}
TypeMap GetTypeMap (Type type)
{
TypeMap map;
if (!typemaps.TryGetValue (type, out map)) {
map = TypeMap.CreateTypeMap (type);
typemaps [type] = map;
}
return map;
}
}
}
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