While some concrete methods are supplied, this is an abstract class since certain methods have to be made concrete by either the UnixEnvMan or the VMSEnvMan which extend this abstract class. Clearly the PathManager must rely on the EnvManager to resolve platform-specific stretches. The parent frame knows which TabView is in the foreground, and is thus able to direct the the desired action to the appropriate tab. This class provides both sorting and filtering of the view. In addition it responds to external events when an OSF in the base model has been added, modified, or deleted.
Some explanation is needed here.
There is a sequence of three field lists. The stage file contains the definition of each stage in the pipeline, and each valid status value for that stage. This information is extracted from the file and saved in an ArrayList of Stages. In addition this class constructs two JComboBoxs which are accessable on the OMG display. This is the base class for managing the OSF information.