private HashSet <string> GetNonExistingMappingFields(IReadOnlyMap <string, string> fieldsMapping)
{
var nonExistingFields = new HashSet <string>();
string mappedFieldName;
foreach (var fieldName in base.GetFieldNames())
{
if (!fieldsMapping.TryGetKey(fieldName, out mappedFieldName))
{
// If nothing maps into current field - ignore
continue;
}
// There is a mapping that results into already existing field, preserve source field name
nonExistingFields.Add(mappedFieldName);
}
// All preserved source field names should be ignored (should not belong to data item), otherwise we have a conflict
foreach (var fieldName in base.GetFieldNames())
{
if (nonExistingFields.Contains(fieldName) &&
// this is not a check, just get target field name for the exception message
fieldsMapping.TryGetValue(fieldName, out mappedFieldName))
{
throw Errors.DataItemAlreadyContainsField(mappedFieldName);
}
}
return(nonExistingFields);
}
public override IEnumerable <string> GetFieldNames()
{
string newFieldName;
foreach (var fieldName in base.GetFieldNames())
{
yield return(fieldsMapping.TryGetValue(fieldName, out newFieldName) ? newFieldName : fieldName);
}
}
private HashSet<string> GetNonExistingMappingFields(IReadOnlyMap<string, string> fieldsMapping)
{
var nonExistingFields = new HashSet<string>();
string mappedFieldName;
foreach (var fieldName in base.GetFieldNames())
{
if (!fieldsMapping.TryGetKey(fieldName, out mappedFieldName))
// If nothing maps into current field - ignore
continue;
// There is a mapping that results into already existing field, preserve source field name
nonExistingFields.Add(mappedFieldName);
}
// All preserved source field names should be ignored (should not belong to data item), otherwise we have a conflict
foreach (var fieldName in base.GetFieldNames())
if (nonExistingFields.Contains(fieldName) &&
// this is not a check, just get target field name for the exception message
fieldsMapping.TryGetValue(fieldName, out mappedFieldName))
throw Errors.DataItemAlreadyContainsField(mappedFieldName);
return nonExistingFields;
}
public static Boolean TryGetValue <TKey, TValue>(this IReadOnlyMap <TKey, TValue> map, TValue key, out TKey result)
{
return(map.TryGetValue(key, out result));
}
