Schedule.java


 import java.util.*; import java.sql.*; public class Schedule {     String name;     int credits = 0;     static final int minCredits = 12;     static final int maxCredits = 18;     boolean overloadAuthorized = false;     ArrayList schedule = new ArrayList();     static String url = "jdbc:odbc:Reggie";     static { try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); }              catch (Exception ignored) {} }     public static void deleteAll() throws Exception {         Connection conn = null;         try {             conn = DriverManager.getConnection(url, "", "");             Statement statement = conn.createStatement();             statement.executeUpdate("DELETE * FROM schedule;");         } finally {             try { conn.close(); } catch (Exception ignored) {}         }     }     public static Schedule create(String name) throws Exception {         Connection conn = null;         try {             conn = DriverManager.getConnection(url, "", "");             Statement statement = conn.createStatement();             statement.executeUpdate(                "DELETE FROM schedule WHERE name = '" + name + "';");             return new Schedule(name);         } finally {             try { conn.close(); } catch (Exception ignored) {}         }     }     public static Schedule find(String name) {         Connection conn = null;         try {             conn = DriverManager.getConnection(url, "", "");             Statement statement = conn.createStatement();             ResultSet result = statement.executeQuery(                 "SELECT * FROM schedule WHERE Name= '" + name + "';");             Schedule schedule = new Schedule(name);             while (result.next()) {                 int offeringId = result.getInt("OfferingId");                 Offering offering = Offering.find(offeringId);                 schedule.add(offering);             }             return schedule;         } catch (Exception ex) {             return null;         } finally {             try { conn.close(); } catch (Exception ignored) {}         }     }     public static Collection all() throws Exception {         ArrayList result = new ArrayList();         Connection conn = null;         try {             conn = DriverManager.getConnection(url, "", "");             Statement statement = conn.createStatement();             ResultSet results = statement.executeQuery(                 "SELECT DISTINCT Name FROM schedule;");             while (results.next())                 result.add(Schedule.find(results.getString("Name")));         } finally {             try { conn.close(); } catch (Exception ignored) {}         }         return result;     }     public void update() throws Exception {         Connection conn = null;         try {             conn = DriverManager.getConnection(url, "", "");             Statement statement = conn.createStatement();             statement.executeUpdate(                  "DELETE FROM schedule WHERE name = '" + name + "';");             for (int i = 0; i < schedule.size(); i++) {                 Offering offering = (Offering) schedule.get(i);                 statement.executeUpdate(                      "INSERT INTO schedule VALUES('" + name + "','"                      + offering.getId() + "');");             }         } finally {             try { conn.close(); } catch (Exception ignored) {}         }     }     public Schedule(String name) {         this.name = name;     }     public void add(Offering offering) {         credits += offering.getCourse().getCredits();         schedule.add(offering);     }     public void authorizeOverload(boolean authorized) {         overloadAuthorized = authorized;     }     public List analysis() {         ArrayList result = new ArrayList();         if (credits < minCredits)             result.add("Too few credits");         if (credits > maxCredits && !overloadAuthorized)             result.add("Too many credits");         checkDuplicateCourses(result);         checkOverlap(result);         return result;     }     public void checkDuplicateCourses(ArrayList analysis) {         HashSet courses = new HashSet();         for (int i = 0; i < schedule.size(); i++) {             Course course = ((Offering) schedule.get(i)).getCourse();             if (courses.contains(course))                analysis.add("Same course twice - " + course.getName());             courses.add(course);         }     }     public void checkOverlap(ArrayList analysis) {       HashSet times = new HashSet();       for (Iterator iterator = schedule.iterator();           iterator.hasNext();)       {           Offering offering = (Offering) iterator.next();           String daysTimes = offering.getDaysTimes();           StringTokenizer tokens = new StringTokenizer(daysTimes, ",");           while (tokens.hasMoreTokens()) {               String dayTime = tokens.nextToken();               if (times.contains(dayTime))                   analysis.add("Course overlap - " + dayTime);               times.add(dayTime);           }       }     }     public String toString() {         return "Schedule " + name + ": " + schedule;     } } 


Refactoring Workbook
Refactoring Workbook
ISBN: 0321109295
EAN: 2147483647
Year: 2003
Pages: 146

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