/// <summary>
/// Extends the reader by reading another set of records that are children of the previous results.
/// </summary>
/// <typeparam name="T1">The type of objects in the first set of results.</typeparam>
/// <typeparam name="T2">The type of objects in the second set of results.</typeparam>
/// <typeparam name="TId">The type of the ID value.</typeparam>
/// <param name="previous">The previous reader.</param>
/// <param name="recordReader">The mapping that defines the layout of the records in each row.</param>
/// <param name="id">An optional function that extracts an ID from the object. Use when this row is a parent in a parent-child relationship.</param>
/// <param name="into">A function that assigns the children to their parent.</param>
/// <returns>A reader that reads a Results object with child records.</returns>
public static ResultsReader <T1> ThenChildren <T1, T2, TId>(
this ResultsReader <T1> previous,
RecordReader <T2> recordReader,
Func <T1, TId> id,
Action <T1, List <T2> > into = null)
{
return(previous.ThenChildren(recordReader.GroupByAuto <T1, TId>(), id, into));
}
/// <summary>
/// Extends the reader by reading another set of records that are children of a subobject of the previous results.
/// </summary>
/// <typeparam name="TRoot">The type of the root object that is returned.</typeparam>
/// <typeparam name="TParent">The type of the parent object in the parent-child relationship.</typeparam>
/// <typeparam name="TChild">The type of the child in the parent-child relationship.</typeparam>
/// <typeparam name="TId">The type of the ID value.</typeparam>
/// <param name="previous">The previous reader.</param>
/// <param name="recordReader">The mapping that defines the layout of the records in each row.</param>
/// <param name="parents">A function that selects the list of parents from the root object.</param>
/// <param name="id">A function that selects the ID from a parent.</param>
/// <param name="into">A function that assigns the children to their parent.</param>
/// <returns>A reader that reads a Results objects with children.</returns>
public static ResultsReader <TRoot> ThenChildren <TRoot, TParent, TChild, TId>(
this ResultsReader <TRoot> previous,
RecordReader <TChild> recordReader,
Func <TRoot, IEnumerable <TParent> > parents,
Func <TParent, TId> id,
Action <TParent, List <TChild> > into = null)
{
return(previous.ThenChildren(recordReader.GroupByAuto <TParent, TId>(), parents, id, into));
}
public static ListReader <T1> ThenChildren <T1, T2>(
this ListReader <T1> previous,
RecordReader <T2> recordReader,
Action <T1, List <T2> > into = null)
{
if (previous == null)
{
throw new ArgumentNullException("previous");
}
if (recordReader == null)
{
throw new ArgumentNullException("recordReader");
}
return(previous.ThenChildren(recordReader.GroupByAuto <T1, object>(), null, into));
}
public static ListReader <TRoot> ThenChildren <TRoot, TParent, TChild>(
this ListReader <TRoot> previous,
RecordReader <TChild> recordReader,
Func <TRoot, IEnumerable <TParent> > parents,
Action <TParent, List <TChild> > into = null)
{
if (previous == null)
{
throw new ArgumentNullException("previous");
}
if (recordReader == null)
{
throw new ArgumentNullException("recordReader");
}
return(previous.ThenChildren(recordReader.GroupByAuto <TParent, object>(), parents, null, into));
}
/// <summary>
/// Extends the reader by reading another set of records that are children of the previous results.
/// </summary>
/// <typeparam name="T1">The type of objects in the first set of results.</typeparam>
/// <typeparam name="T2">The type of objects in the second set of results.</typeparam>
/// <typeparam name="TId">The type of the ID value.</typeparam>
/// <param name="previous">The previous reader.</param>
/// <param name="recordReader">The mapping that defines the layout of the records in each row.</param>
/// <param name="id">An optional function that extracts an ID from the object. Use when this row is a parent in a parent-child relationship.</param>
/// <param name="into">A function that assigns the children to their parent.</param>
/// <returns>A reader that reads a Results object with child records.</returns>
public static ResultsReader <T1> ThenChildren <T1, T2, TId>(
this ResultsReader <T1> previous,
RecordReader <T2> recordReader,
Func <T1, TId> id,
Action <T1, List <T2> > into = null)
{
if (previous == null)
{
throw new ArgumentNullException("previous");
}
if (recordReader == null)
{
throw new ArgumentNullException("recordReader");
}
return(previous.ThenChildren(recordReader.GroupByAuto <T1, TId>(), id, into));
}
public static SingleReader <TRoot> ThenChildren <TRoot, TParent, TChild, TId>(
this SingleReader <TRoot> previous,
RecordReader <TChild> recordReader,
Func <TRoot, IEnumerable <TParent> > parents,
Func <TParent, TId> id,
Action <TParent, List <TChild> > into = null)
{
if (previous == null)
{
throw new ArgumentNullException("previous");
}
if (recordReader == null)
{
throw new ArgumentNullException("recordReader");
}
return(previous.AddChild(new Children <TRoot, TChild, TId>(recordReader.GroupByAuto <TParent, TId>(), new ChildMapper <TRoot, TParent, TChild, TId>(parents, id, into))));
}
