namespace Connected.Data.Schema.Sql
{
    internal class ObjectDescriptor
    {
        private ObjectMetaData _metaData = null;
        private List<ObjectColumn> _columns = null;
        private ObjectIdentity _identity = null;
        private ObjectRowGuid _rowGuid = null;
        private ObjectFileGroup _fileGroup = null;
        private List<ObjectIndex> _indexes = null;
        private List<ObjectConstraint> _constraints = null;

        public ObjectFileGroup FileGroup
        {
            get
            {
                if (_fileGroup == null)
                    _fileGroup = new ObjectFileGroup();

                return _fileGroup;
            }
        }

        public ObjectRowGuid RowGuid
        {
            get
            {
                if (_rowGuid == null)
                    _rowGuid = new ObjectRowGuid();

                return _rowGuid;
            }
        }

        public ObjectIdentity Identity
        {
            get
            {
                if (_identity == null)
                    _identity = new ObjectIdentity();

                return _identity;
            }
        }

        public ObjectMetaData MetaData
        {
            get
            {
                if (_metaData == null)
                    _metaData = new ObjectMetaData();

                return _metaData;
            }
        }

        public List<ObjectColumn> Columns
        {
            get
            {
                if (_columns == null)
                    _columns = new List<ObjectColumn>();

                return _columns;
            }
        }

        public List<ObjectIndex> Indexes
        {
            get
            {
                if (_indexes == null)
                    _indexes = new List<ObjectIndex>();

                return _indexes;
            }
        }

        public List<ObjectConstraint> Constraints
        {
            get
            {
                if (_constraints == null)
                    _constraints = new List<ObjectConstraint>();

                return _constraints;
            }
        }
    }
}