/// <summary>
/// Reads back an array of ID mappings, associating the user-perceived IDs with the
/// corresponding spatial features.
/// </summary>
/// <param name="field">A tag associated with the array</param>
internal void ReadIdMappings(DataField field)
{
if (!IsNextField(field))
{
return;
}
IdMapping[] mapping = ReadPersistentArray <IdMapping>(field);
for (int i = 0; i < mapping.Length; i++)
{
IdMapping m = mapping[i];
NativeId nid = MapModel.FindNativeId(m.RawId);
if (nid == null)
{
nid = MapModel.AddNativeId(m.RawId);
}
Feature f = MapModel.Find <Feature>(m.InternalId);
// Ignore null ref if we are dealing with the very last mapping of a connection path
// (covers CEdit bug that produced spurious point at the end of the path).
if (f == null)
{
//if (m_CurrentEdit is PathOperation && i == (mapping.Length - 1))
// break;
throw new ApplicationException("Cannot locate feature for ID mapping: " + m);
}
f.SetId(nid);
}
}
/// <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);
}
