// Copyright 2007-2017 Chris Patterson, Dru Sellers, Travis Smith, et. al.
//  
// 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.
namespace MassTransit.Azure.ServiceBus.Core.Topology.Conventions.PartitionKey
{
    using System;
    using Topology;


    public class DelegatePartitionKeyFormatter<TMessage> :
        IMessagePartitionKeyFormatter<TMessage>
        where TMessage : class
    {
        readonly Func<SendContext<TMessage>, string> _formatter;

        public DelegatePartitionKeyFormatter(Func<SendContext<TMessage>, string> formatter)
        {
            _formatter = formatter;
        }

        public string FormatPartitionKey(SendContext<TMessage> context)
        {
            return _formatter(context) ?? "";
        }
    }
}