/// <summary>
/// Deserialize a JSON value into an instance.
/// </summary>
/// <param name="value">The JSON value.</param>
/// <param name="instance">The instance to deserialize into.</param>
/// <param name="ignoreCustomSerialization">
/// A value to indicate whether or not custom serialization should be
/// ignored if the instance implements
/// ICustomMobileServiceTableSerialization. This flag is used by
/// implementations of ICustomMobileServiceTableSerialization that want
/// to invoke the default serialization behavior.
/// </param>
public static void Deserialize(JToken value, object instance, bool ignoreCustomSerialization)
{
if (value == null)
{
throw new ArgumentNullException("value");
}
else if (instance == null)
{
throw new ArgumentNullException("instance");
}
// If the instance implements
// ICustomMobileServiceTableSerialization, allow it to handle its
// own deserialization.
if (!ignoreCustomSerialization)
{
ICustomMobileServiceTableSerialization custom = instance as ICustomMobileServiceTableSerialization;
if (custom != null)
{
custom.Deserialize(value);
return;
}
}
// Get the Mobile Services specific type info
SerializableType type = SerializableType.Get(instance.GetType());
// Get the object to deserialize
JObject obj = value.AsObject();
if (obj == null)
{
throw new ArgumentException(
string.Format(
CultureInfo.InvariantCulture,
Resources.MobileServiceTableSerializer_Deserialize_NeedObject,
value.Type),
"value");
}
// Create a set of required members that we can remove from as we
// process their values from the object. If there's anything left
// in the set after processing all of the values, then we weren't
// given all of our required properties.
HashSet <SerializableMember> requiredMembers =
new HashSet <SerializableMember>(type.Members.Values.Where(m => m.IsRequired));
// Walk through all of the members defined in the object and
// deserialize them into the instance one at a time
foreach (KeyValuePair <string, JToken> assignment in obj.GetPropertyValues().OrderBy(a => type.GetMemberOrder(a.Key)))
{
// Look up the instance member corresponding to the JSON member
SerializableMember member = null;
if (type.Members.TryGetValue(assignment.Key, out member))
{
// Remove the member from the required list (does nothing
// if it wasn't present)
requiredMembers.Remove(member);
// Convert the property value into a CLR value using either
// the converter or a standard simple JSON mapping. This
// will throw for JSON arrays or objects. Also note that
// we'll still run the value returned from the converter
// through the ChangeType call below to make writing
// converters a little easier (but it should be a no-op
// for most folks anyway).
object propertyValue = null;
if (member.Converter != null)
{
propertyValue = member.Converter.ConvertFromJson(assignment.Value);
}
else if (!assignment.Value.TryConvert(out propertyValue))
{
throw new ArgumentException(
string.Format(
CultureInfo.InvariantCulture,
Resources.MobileServiceTableSerializer_Deserialize_CannotDeserializeValue,
assignment.Value.ToString(),
type.Type.FullName,
member.MemberName),
"value");
}
// Change the type of the value to the desired property
// type (mostly to handle things like casting issues) and
// set the value on the instance.
object convertedValue = TypeExtensions.ChangeType(propertyValue, member.Type);
member.SetValue(instance, convertedValue);
}
}
// Ensure we were provided all of the required properties.
if (requiredMembers.Count > 0)
{
throw new SerializationException(
string.Format(
CultureInfo.InvariantCulture,
Resources.MobileServiceTableSerializer_Deserialize_MissingRequired,
type.Type.FullName,
string.Join(", ", requiredMembers.Select(m => m.Name))));
}
}
