Refactoring Workbook

import java.util.*; public class Report { public Report() { } Hashtable offeringToName = new Hashtable(); public void populateMap() throws Exception { Collection schedules = Schedule.all(); for (Iterator eachSchedule = schedules.iterator(); eachSchedule.hasNext();) { Schedule schedule = (Schedule) eachSchedule.next(); for (Iterator each = schedule.schedule.iterator(); each.hasNext(); ) { Offering offering = (Offering) each.next(); populateMapFor(schedule, offering); } } } private void populateMapFor(Schedule schedule, Offering offering) { ArrayList list = (ArrayList) offeringToName.get( new Integer(offering.getId())); if (list == null) { list = new ArrayList(); offeringToName.put(new Integer(offering.getId()), list); } list.add(schedule.name); } public void writeOffering( StringBuffer buffer, ArrayList list, Offering offering) { buffer.append(offering.getCourse().getName() + " " + offering.getDaysTimes() + "\n"); for (Iterator iterator = list.iterator(); iterator.hasNext();) { String s = (String) iterator.next(); buffer.append("\t" + s + "\n"); } } public void write(StringBuffer buffer) throws Exception { populateMap(); Enumeration enumeration = offeringToName.keys(); while (enumeration.hasMoreElements()) { Integer offeringId = (Integer) enumeration.nextElement(); ArrayList list = (ArrayList) offeringToName.get(offeringId); writeOffering(buffer, list, Offering.find(offeringId.intValue())); } buffer.append("Number of scheduled offerings: "); buffer.append(offeringToName.size()); buffer.append("\n"); } }