/// <summary>
/// Reads a user-perceived feature ID using the specified naming tags.
/// </summary>
/// <param name="nativeField">The tag to use for a native ID.</param>
/// <param name="foreignField">The tag to use for a foreign ID.</param>
/// <returns>The user-perceived ID that was read (may be null)</returns>
internal FeatureId ReadFeatureId(DataField nativeField, DataField foreignField)
{
if (IsNextField(nativeField))
{
uint nativeKey = m_Reader.ReadUInt32(nativeField.ToString());
NativeId nid = MapModel.FindNativeId(nativeKey);
if (nid == null)
{
return(MapModel.AddNativeId(nativeKey));
}
else
{
return(nid);
}
}
if (IsNextField(foreignField))
{
string key = m_Reader.ReadString(foreignField.ToString());
ForeignId fid = MapModel.FindForeignId(key);
if (fid == null)
{
return(MapModel.AddForeignId(key));
}
else
{
return(fid);
}
}
return(null);
}