import COM.odi.util.OSHashSet;

public class Journal{
  // member variables
  String journalName;
  OSHashSet volumes;

  public Journal(String jrnalName){
  // constructor
    journalName = jrnalName;
    volumes = new OSHashSet();
  }

  // methods for Journal class
  public void addVolume(Volume volume){
  //method to add volume to the journal
    if(volumes.contains(volume)){
        System.out.println("Volume Already Exists  ");
        System.exit(0);
        }
    volumes.add(volume);
  }

  public int getNumberOfVolumes(){
  // method to get the number of volumes in the journal
    return volumes.size();
  }
  public String getJournalName(){
  //method to get the journal Name
    return journalName;
  }
  public OSHashSet getVolumes(){
  // method to get collection of volumes
    return volumes;
  }
}