QueryTable.cs

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;

using IQToolkit;

namespace Deveel.Data.Linq {
    public sealed class QueryTable<T> : IQueryable<T> where T : class {
        internal QueryTable(QueryContext context) {
            QueryContext = context;
        }

        public QueryContext QueryContext { get; private set; }

        private IEntityTable<T> EntityTable {
            get { return QueryContext.GetTable<T>(); }
        }

        IEnumerator<T> IEnumerable<T>.GetEnumerator() {
            return EntityTable.GetEnumerator();
        }

        IEnumerator IEnumerable.GetEnumerator() {
            return EntityTable.GetEnumerator();
        }

        Expression IQueryable.Expression {
            get { return EntityTable.Expression; }
        }

        Type IQueryable.ElementType {
            get { return EntityTable.ElementType; }
        }

        IQueryProvider IQueryable.Provider {
            get { return EntityTable.Provider; }
        }

        public int Remove(T entity) {
            return EntityTable.Delete(entity);
        }

        public T FindById(object id) {
            if (id == null)
                throw new ArgumentNullException("id");

            try {
                return EntityTable.GetById(id);
            } catch (Exception ex) {
                throw new QueryException(String.Format("Error while querying type '{0}' by id.", typeof(T)), ex);
            }
        }
        
        public int Update(T entity) {
            return EntityTable.Update(entity);
        }

        public int Add(T entity) {
            return EntityTable.Insert(entity);
        }
    }
}