structureChanges method

Map<String, String> structureChanges(NUIDBEntityTracker tracker)

Implementation

Map<String, String> structureChanges(NUIDBEntityTracker tracker){
  final matchingMap = Map<String, String>();

  //Add all current fields as ADDED
  for(NUIDBField t in fields()){
    matchingMap[t.name] = _ADDED;

    bool isNew = true;
    for(NUIDBFieldTracker field in tracker.fields){
      if(match(t.name, field.name)){
        isNew = false;
        break;
      }
    }
    if(isNew == true && t.primaryKey == true){
      //Added new primary key, recreate table
      matchingMap[t.name] = _REMOVED_PRIMARY;
    }
  }

  //Loop through the list of fields from previous version
  for(NUIDBFieldTracker field in tracker.fields){
    final fieldName = field.name;
    bool foundField = false;
    bool fieldChanged = false;

    //Loop through current fields to find matches or changes
    for(NUIDBField t in fields()){
      if(match(t.name, fieldName)){
        //Found a matching field
        foundField = true;
        fieldChanged = t.structureChanged(field);
        break;
      }
    }

    if(foundField){
      //Found at matching field
      if(fieldChanged) {
        //Data type of the field changed
        matchingMap[fieldName] = _UPDATED;
      }
      else{
        //No changes for this field
        matchingMap[fieldName] = _SAME;
      }
    }
    else{
      //Field removed from this entity
      if(field.primaryKey == true){
        matchingMap[fieldName] = _REMOVED_PRIMARY;
      }
      else {
        matchingMap[fieldName] = _REMOVED;
      }
    }
  }

  return matchingMap;
}