/// <summary>
/// Begins mapping objects from Dapper.
/// </summary>
/// <typeparam name="TEntityType">The entity type to be mapped.</typeparam>
/// <returns>The mapped entity.</returns>
public TEntityType Start <TEntityType>()
where TEntityType : class
{
lock (LockObject)
{
ItemEnumerator = Items.GetEnumerator();
SplitOnEnumerator = SplitOn.GetEnumerator();
CurrentSelectionSet = SelectionSet.GetSelectedFields();
MappedCount = 0;
if (ItemEnumerator.MoveNext() &&
SplitOnEnumerator.MoveNext())
{
var entity = ItemEnumerator.Current as TEntityType;
MappedCount++;
return(entity);
}
return(default(TEntityType));
}
}
public string PerformOperation(string StringToManipulate)
{
string result = StringToManipulate;
switch (_OperationType)
{
case OperationTypes.Split:
char splitOn = SplitOn.ToCharArray()[0];
string[] tempSplit = result.Split(splitOn);
int indexOfSplit = Index;
if (tempSplit.Length > indexOfSplit)
{
result = tempSplit[indexOfSplit];
}
else
{
result = "";
}
break;
case OperationTypes.Replace:
string toReplace = Replace;
string replaceWith = ReplaceWith;
result = result.Replace(toReplace, replaceWith);
break;
case OperationTypes.EndWith:
string endValue = Value;
if (!result.TrimEnd().EndsWith("."))
{
result += endValue;
}
break;
}
return(result);
}
/// <summary>
/// Maps the next object from Dapper.
/// </summary>
/// <typeparam name="TItemType">The item type to be mapped.</typeparam>
/// <param name="context">The context used to map object from Dapper.</param>
/// <param name="fieldNames">The names of one or more GraphQL fields associated with the item.</param>
/// <param name="entityMapper">An optional entity mapper. This is used to map complex objects from Dapper mapping results.</param>
/// <returns>The mapped item.</returns>
public TItemType Next <TItemType>(
IEnumerable <string> fieldNames,
Func <IDictionary <string, Field>, IHaveSelectionSet, IHaveSelectionSet> getSelectionSet,
IEntityMapper <TItemType> entityMapper = null)
where TItemType : class
{
if (fieldNames == null)
{
throw new ArgumentNullException(nameof(fieldNames));
}
if (ItemEnumerator == null ||
SplitOnEnumerator == null)
{
throw new NotSupportedException("Cannot call Next() before calling Start()");
}
lock (LockObject)
{
var keys = fieldNames.Intersect(CurrentSelectionSet.Keys);
if (keys.Any())
{
TItemType item = default(TItemType);
while (
ItemEnumerator.MoveNext() &&
SplitOnEnumerator.MoveNext())
{
// Whether a non-null object exists at this position or not,
// the SplitOn is expecting this type here, so we will yield it.
if (SplitOnEnumerator.Current == typeof(TItemType))
{
item = ItemEnumerator.Current as TItemType;
break;
}
}
if (entityMapper != null)
{
// Determine where the next entity mapper will get its selection set from
IHaveSelectionSet selectionSet = getSelectionSet(CurrentSelectionSet, SelectionSet);
var nextContext = new EntityMapContext
{
Items = Items.Skip(MappedCount),
SelectionSet = selectionSet,
SplitOn = SplitOn.Skip(MappedCount),
};
using (nextContext)
{
item = entityMapper.Map(nextContext);
// Update enumerators to skip past items already mapped
var mappedCount = nextContext.MappedCount;
MappedCount += nextContext.MappedCount;
int i = 0;
while (
// Less 1, the next time we iterate we
// will advance by 1 as part of the iteration.
i < mappedCount - 1 &&
ItemEnumerator.MoveNext() &&
SplitOnEnumerator.MoveNext())
{
i++;
}
}
}
else
{
MappedCount++;
}
return(item);
}
}
return(default(TItemType));
}
