ServiceRegistration.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;

namespace Deveel.Data.Services {
    public sealed class ServiceRegistration {
        private object instance;

        public ServiceRegistration(Type serviceType, Type implementationType) {
            if (serviceType == null)
                throw new ArgumentNullException("serviceType");
            if (implementationType == null)
                throw new ArgumentNullException("implementationType");

            if (!serviceType.IsAssignableFrom(implementationType))
                throw new ArgumentException(
                    String.Format("The implementation type '{0} is not assignable from the service type '{1}'.",
                        implementationType, serviceType));

            ServiceType = serviceType;
            ImplementationType = implementationType;
        }

        public Type ServiceType { get; private set; }

        public Type ImplementationType { get; private set; }

        public object ServiceKey { get; set; }

        public string Scope { get; set; }

        public object Instance {
            get { return instance; }
            set {
                if (value != null &&
                    !ServiceType.IsInstanceOfType(value))
                    throw new ArgumentException(String.Format("The instance is not assignable from '{0}'.", ServiceType));

                instance = value;
            }
        }
    }
}