using System;

namespace BLToolkit.Mapping
{
    public class MapRelationBase
    {
        public MapRelationBase(
            Type         slave,
            MapIndex     slaveIndex,
            MapIndex     masterIndex,
            string       containerName)
        {
            if (slave == null)
                throw new ArgumentNullException("slave");

            if (masterIndex.Fields.Length == 0)
                throw new MappingException("Master index length can not be 0.");

            if ( slaveIndex.Fields.Length == 0)
                throw new MappingException("Slave index length can not be 0.");

            if (masterIndex.Fields.Length != slaveIndex.Fields.Length)
                throw new MappingException("Master and slave indexes do not match.");

            if (string.IsNullOrEmpty(containerName))
                throw new MappingException("Master container field name is wrong.");
            
            _slave           = slave;
            _masterIndex     = masterIndex;
            _slaveIndex      = slaveIndex;
            _containerName   = containerName;
        }

        private readonly MapIndex _masterIndex;
        public           MapIndex  MasterIndex
        {
            get { return _masterIndex; }
        }

        private readonly MapIndex _slaveIndex;
        public           MapIndex  SlaveIndex
        {
            get { return _slaveIndex; }
        }

        private readonly string _containerName;
        public           string  ContainerName
        {
            get { return _containerName; }
        }

        private readonly Type _slave;
        public           Type  Slave
        {
            get { return _slave; }
        }
    }
}