/// <summary>
/// Initializes static members of the Together class.
/// </summary>
/// <param name="parentIDName">The name of the field containing the ID in the parent class. Defaults to autodetect.</param>
/// <param name="into">The name of the field list of the child objects in the parent class. Defaults to autodetect.</param>
public Together(string parentIDName = null, string into = null)
{
_parentIDName = parentIDName;
_into = into;
_parentID = ChildMapperHelper.GetIDAccessor(typeof(T), parentIDName).CreateGetMethod <T, Object>();
_listSetter = ChildMapperHelper.GetListAccessor(typeof(T), typeof(TChild), into, setter: true).CreateSetMethod <T, List <TChild> >();
_listGetter = ChildMapperHelper.GetListAccessor(typeof(T), typeof(TChild), into, setter: false).CreateGetMethod <T, ICollection <TChild> >();
}
/// <summary>
/// Initializes a new instance of the ChildMapper class.
/// </summary>
/// <param name="idSelector">The function that selects IDs from the parent object.</param>
/// <param name="listSetter">The action that sets the children into the proper parent.</param>
public ChildMapper(
Func <TParent, TId> idSelector,
Action <TParent, List <TChild> > listSetter)
{
if (idSelector == null)
{
_idType = ChildMapperHelper.GetIDAccessor(typeof(TParent)).MemberType;
}
_idSelector = idSelector ?? _defaultIDSelector.Value;
_listSetter = listSetter ?? _defaultListSetter.Value;
}
/// <summary>
/// Creates a child record reader that autogroups the given type, based on the parent's ids.
/// </summary>
/// <typeparam name="TId">The type of the ID.</typeparam>
/// <param name="parentType">The type of the parent.</param>
/// <returns>A child record reader.</returns>
private IChildRecordReader <T, TId> CreateAutoGroupBy <TId>(Type parentType)
{
// if we can detect the parent ids from the child class, then use that to do the mapping
var idAccessor = ChildMapperHelper.FindParentIDAccessor(typeof(T), null, parentType);
if (idAccessor != null)
{
var getid = idAccessor.CreateGetMethod <T, TId>();
return(new ChildRecordReader <T, TId, T>(this, records => records.GroupBy(getid, r => r)));
}
else
{
List <Type> guardianTypes = new List <Type>();
// if a selector was specified, use it, else use the parent's ID accessor to define external columns to use as the key
if (typeof(TId) != typeof(object))
{
if (typeof(TId).Name.StartsWith("Tuple`", StringComparison.OrdinalIgnoreCase))
{
guardianTypes.AddRange(typeof(TId).GetGenericArguments());
}
else
{
guardianTypes.Add(typeof(TId));
}
}
else
{
guardianTypes.AddRange(ChildMapperHelper.GetIDAccessor(parentType).MemberTypes);
}
guardianTypes.Insert(0, typeof(T));
var guardianType = GetGuardianType(guardianTypes.Count).MakeGenericType(guardianTypes.ToArray());
#if NET35
var getReader = this.GetType().GetMethod("GetAdaptedReader", BindingFlags.Instance | BindingFlags.NonPublic).MakeGenericMethod(guardianType, typeof(Guardian <T>));
#else
var getReader = this.GetType().GetMethod("GetGuardianReader").MakeGenericMethod(guardianType);
#endif
var reader = (IRecordReader <Guardian <T> >)getReader.Invoke(this, Parameters.EmptyArray);
return(new ChildRecordReader <Guardian <T>, TId, T>(reader, records => records.GroupBy(g => (TId)g.GetID(), g => g.Object)));
}
}
/// <summary>
/// Gets the ID selector from the class, looking for ID, classID, and then anything with xxxID.
/// </summary>
/// <returns>An accessor for the ID field.</returns>
private static Func <TParent, TId> GetIDSelector()
{
return(ChildMapperHelper.GetIDAccessor(typeof(TParent)).CreateGetMethod <TParent, TId>());
}
/// <summary>
/// Gets the ID selector from the class, looking for ID, classID, and then anything with xxxID.
/// </summary>
/// <returns>An accessor for the ID field.</returns>
private static Func <T, Object> GetIDSelector()
{
return(ChildMapperHelper.GetIDAccessor(typeof(T)).CreateGetMethod <T, Object>());
}
/// <summary>
/// Used for internal testing.
/// </summary>
/// <param name="type">The parameter is not used.</param>
/// <param name="name">The parameter is not used.</param>
/// <returns>The parameter is not used.</returns>
public static IList <string> GetIDAccessor(Type type, string name = null)
{
return(ChildMapperHelper.GetIDAccessor(type, name).MemberNames.ToList());
}