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GeoJsonFeatureSerializer.cs
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GeoJsonFeatureSerializer.cs
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/* Copyright 2010-present MongoDB 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 MongoDB.Bson;
using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Serializers;
namespace MongoDB.Driver.GeoJsonObjectModel.Serializers
{
/// <summary>
/// Represents a serializer for a GeoJsonFeature value.
/// </summary>
/// <typeparam name="TCoordinates">The type of the coordinates.</typeparam>
public class GeoJsonFeatureSerializer<TCoordinates> : ClassSerializerBase<GeoJsonFeature<TCoordinates>> where TCoordinates : GeoJsonCoordinates
{
// private constants
private static class Flags
{
public const long Geometry = 16;
public const long Id = 32;
public const long Properties = 64;
}
// private fields
private readonly IBsonSerializer<GeoJsonGeometry<TCoordinates>> _geometrySerializer = BsonSerializer.LookupSerializer<GeoJsonGeometry<TCoordinates>>();
private readonly GeoJsonObjectSerializerHelper<TCoordinates> _helper;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="GeoJsonFeatureSerializer{TCoordinates}"/> class.
/// </summary>
public GeoJsonFeatureSerializer()
{
_helper = new GeoJsonObjectSerializerHelper<TCoordinates>
(
"Feature",
new SerializerHelper.Member("geometry", Flags.Geometry),
new SerializerHelper.Member("id", Flags.Id, isOptional: true),
new SerializerHelper.Member("properties", Flags.Properties, isOptional: true)
);
}
// protected methods
/// <summary>
/// Deserializes a value.
/// </summary>
/// <param name="context">The deserialization context.</param>
/// <param name="args">The deserialization args.</param>
/// <returns>The value.</returns>
protected override GeoJsonFeature<TCoordinates> DeserializeValue(BsonDeserializationContext context, BsonDeserializationArgs args)
{
var geoJsonFeatureArgs = new GeoJsonFeatureArgs<TCoordinates>();
GeoJsonGeometry<TCoordinates> geometry = null;
_helper.DeserializeMembers(context, (elementName, flag) =>
{
switch (flag)
{
case Flags.Geometry: geometry = DeserializeGeometry(context); break;
case Flags.Id: geoJsonFeatureArgs.Id = DeserializeId(context); break;
case Flags.Properties: geoJsonFeatureArgs.Properties = DeserializeProperties(context); break;
default: _helper.DeserializeBaseMember(context, elementName, flag, geoJsonFeatureArgs); break;
}
});
return new GeoJsonFeature<TCoordinates>(geoJsonFeatureArgs, geometry);
}
/// <summary>
/// Serializes a value.
/// </summary>
/// <param name="context">The serialization context.</param>
/// <param name="args">The serialization args.</param>
/// <param name="value">The value.</param>
protected override void SerializeValue(BsonSerializationContext context, BsonSerializationArgs args, GeoJsonFeature<TCoordinates> value)
{
_helper.SerializeMembers(context, value, SerializeDerivedMembers);
}
// private methods
private GeoJsonGeometry<TCoordinates> DeserializeGeometry(BsonDeserializationContext context)
{
return _geometrySerializer.Deserialize(context);
}
private BsonValue DeserializeId(BsonDeserializationContext context)
{
return BsonValueSerializer.Instance.Deserialize(context);
}
private BsonDocument DeserializeProperties(BsonDeserializationContext context)
{
return BsonDocumentSerializer.Instance.Deserialize(context);
}
private void SerializeDerivedMembers(BsonSerializationContext context, GeoJsonFeature<TCoordinates> value)
{
SerializeGeometry(context, value.Geometry);
SerializeId(context, value.Id);
SerializeProperties(context, value.Properties);
}
private void SerializeGeometry(BsonSerializationContext context, GeoJsonGeometry<TCoordinates> geometry)
{
context.Writer.WriteName("geometry");
_geometrySerializer.Serialize(context, geometry);
}
private void SerializeId(BsonSerializationContext context, BsonValue id)
{
if (id != null)
{
context.Writer.WriteName("id");
BsonValueSerializer.Instance.Serialize(context, id);
}
}
private void SerializeProperties(BsonSerializationContext context, BsonDocument properties)
{
if (properties != null)
{
context.Writer.WriteName("properties");
BsonDocumentSerializer.Instance.Serialize(context, properties);
}
}
}
}