mongo-csharp-driver/Bson/DefaultSerializer/BsonDefaultSerializationProvider.cs

/* Copyright 2010 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;

using MongoDB.Bson.IO;
using MongoDB.Bson.Serialization;

namespace MongoDB.Bson.DefaultSerializer {
    public class BsonDefaultSerializationProvider : IBsonSerializationProvider {
        #region private static fields
        private static BsonDefaultSerializationProvider singleton = new BsonDefaultSerializationProvider();
        #endregion

        #region constructors
        private BsonDefaultSerializationProvider() {
        }
        #endregion

        #region public static properties
        public static BsonDefaultSerializationProvider Singleton {
            get { return singleton; }
        }
        #endregion

        #region public static methods
        public static void Initialize() {
            RegisterSerializers();
        }
        #endregion

        #region private static methods
        // automatically register all BsonSerializers found in the Bson library
        private static void RegisterSerializers() {
            var assembly = Assembly.GetExecutingAssembly();
            foreach (var type in assembly.GetTypes()) {
                if (typeof(IBsonSerializer).IsAssignableFrom(type) && type != typeof(IBsonSerializer)) {
                    var registerSerializersInfo = type.GetMethod("RegisterSerializers", BindingFlags.Public | BindingFlags.Static);
                    if (registerSerializersInfo != null) {
                        registerSerializersInfo.Invoke(null, null);
                    }
                }
            }
        }
        #endregion

        #region public methods
        public IBsonIdGenerator GetIdGenerator(
            Type type
        ) {
            // TODO: implement more IdGenerators?
            if (type == typeof(ObjectId)) {
                return new ObjectIdGenerator();
            } else if (type == typeof(Guid)) {
                return new GuidGenerator();
            } else {
                return null;
            }
        }

        public IBsonSerializer GetSerializer(
            Type type,
            object serializationOptions
        ) {
            if (type.IsArray) {
                return GenericArraySerializer.Singleton;
            }

            if (type.IsEnum) {
                return GeneralEnumSerializer.GetSerializer(serializationOptions);
            }

            if (
                type.IsGenericType &&
                type.GetGenericTypeDefinition() == typeof(Nullable<>)
            ) {
                return NullableTypeSerializer.Singleton;
            }

            if (
                type.IsClass &&
                !typeof(Array).IsAssignableFrom(type) &&
                !typeof(Enum).IsAssignableFrom(type)
            ) {
                return BsonClassMapSerializer.Singleton;
            }

            return null;
        }
        #endregion
    }
}