QueryContext.cs

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using System;
using System.Linq;

using Deveel.Data.Mapping;

using IQToolkit;

namespace Deveel.Data.Linq {
    public abstract class QueryContext : IDisposable {
        public QueryContext(IQuery context) {
            ParentContext = context;
        }

        ~QueryContext() {
            Dispose(false);
        }

        public IQuery ParentContext { get; private set; }

        private IQueryProvider Provider { get; set; }

        private DeveelDbProvider CreateProvider() {
            if (Provider == null) {
                // TODO: Get all other settings as metadata

                var mappingContext = new MappingContext();
                OnBuildMap(mappingContext);

                var model = mappingContext.CreateModel();

                Provider = ParentContext.GetQueryProvider(model);
            }

            return (DeveelDbProvider) Provider;
        }

        protected abstract void OnBuildMap(MappingContext mappingContext);

        internal IEntityTable<T> GetTable<T>() where T : class {
            return CreateProvider().GetTable<T>();
        } 

        public QueryTable<T> Table<T>() where T : class {
            return new QueryTable<T>(this);
        }

        public void Dispose() {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing) {
            if (disposing) {
            }

            Provider = null;
        }
    }
}