SystemContextExtensions.cs

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// 
//  Copyright 2010-2015 Deveel
// 
//    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.IO;
using System.Text;

using Deveel.Data.Services;

namespace Deveel.Data.Sql.Query {
    public static class SystemContextExtensions {
        public static void SerializeQueryPlan(this ISystemContext context, IQueryPlanNode planNode, Stream stream) {
            using (var writer = new BinaryWriter(stream, Encoding.Unicode)) {
                context.SerializeQueryPlan(planNode, writer);
            }
        }

        public static void SerializeQueryPlan(this ISystemContext context, IQueryPlanNode node, BinaryWriter writer) {
            var nodeType = node.GetType();

            var serializers = context.ResolveAllServices<IQueryPlanNodeSerializer>();
            foreach (var serializer in serializers) {
                if (serializer.CanSerialize(nodeType)) {
                    serializer.Serialize(node, writer);
                    return;
                }
            }

            throw new InvalidOperationException(string.Format("Could not find any serializer for node type '{0}'.", nodeType));
        }

        public static IQueryPlanNode DeserializeQueryPlan(this ISystemContext context, Type nodeType, BinaryReader reader) {
            var serializers = context.ResolveAllServices<IQueryPlanNodeSerializer>();
            foreach (var serializer in serializers) {
                if (serializer.CanSerialize(nodeType)) {
                    return (IQueryPlanNode)serializer.Deserialize(reader);
                }
            }

            throw new InvalidOperationException(string.Format("Could not find any serializer for node type '{0}'.", nodeType));
        }
    }
}