/// <summary>
/// This is the entry point of Linq to db4o.
/// It allows the compiler to call the standard query operators
/// in <see cref="Db4objects.Db4o.Linq.IDb4oLinqQuery">IDb4oLinqQuery</see>. The optimized methods are defined as extension methods
/// on the <see cref="Db4objects.Db4o.Linq.IDb4oLinqQuery">IDb4oLinqQuery</see> marker interface.
/// </summary>
/// <typeparam name="T">The type to query the ObjectContainer</typeparam>
/// <param name="self">A query factory (any IObjectContainer implementation)</param>
/// <returns>A <see cref="Db4objects.Db4o.Linq.IDb4oLinqQuery">IDb4oLinqQuery</see> marker interface</returns>
public static IDb4oLinqQuery <T> Cast <T>(this ISodaQueryFactory queryFactory)
{
if (typeof(T) == typeof(object))
{
return(new PlaceHolderQuery <T>(queryFactory));
}
return(new Db4oQuery <T>(queryFactory));
}
public Db4oQuery(ISodaQueryFactory queryFactory)
{
if (queryFactory == null)
{
throw new ArgumentNullException("queryFactory");
}
_queryFactory = queryFactory;
_record = NullQueryBuilderRecord.Instance;
}
public Db4oQuery(Db4oQuery <T> parent, IQueryBuilderRecord record)
{
_queryFactory = parent.QueryFactory;
_record = new CompositeQueryBuilderRecord(parent.Record, record);
}
public PlaceHolderQuery(ISodaQueryFactory queryFactory)
{
QueryFactory = queryFactory;
}
public static IDb4oLinqQueryable <T> AsQueryable <T>(this ISodaQueryFactory queryFactory)
{
return(queryFactory.Cast <T>().AsQueryable());
}