CMIS440-model2-models.java

//Course.java
//This domain object represents a course. The data attributes are 
//all package-private to allow access to them in the CourseService class.
package domain;
public class Course implements java.io.Serializable {
   int objectID;
   String semester;
   String number;
   String title;
   //The default constructor is public to be accessible from JSP View pages. 
   public Course() {this(-1,"","","");} 
   //The full constructor is package-private to prevent misuse.  
   //The CourseServer method createCourse should be used to create 
   //a new Course object.    
   Course(int oID,String s,String n,String t) {
      objectID=oID;
      semester=s;
      number=n;
      title=t;
   }
   public String getSemester() {return semester;}
   public String getNumber() {return number;}
   public String getTitle() {return title;} 
   public void setObjectID(int id) {objectID=id;}
   public int getObjectID() {return objectID;}
}
//Student.java
//This domain object represents a Student. The data attributes are 
//all package-private to allow access to them in the RegisterService class.
package domain;
public class Student implements java.io.Serializable {
   int objectID;
   String name;
   String address;
   String city;
   String state;
   String zipCode; 
   //The default constructor is public to be accessible from JSP View pages. 
   public Student() {this(-1,"","","","","");}
   //The full constructor is package-private to prevent misuse. The 
   //RegisterServer method createStudent should be used to create 
   //a new Student object.
   Student(int oID,String n,String a,String c,String s,String zc){
      objectID=oID;
      name=n;
      address=a;
      city=c;
      state=s;
      zipCode=zc;
   }
   public String getName() {return name;}
   public String getAddress() {return address;}
   public String getCity() {return city;}
   public String getState() {return state;}
   public String getZipCode() {return zipCode;} 
   public void setObjectID(int id) {objectID=id;}
   public int getObjectID() {return objectID;}
}
//RegisterService.java 
//This object performs course registration services – it acts as a
//Facade into the business logic of registering a Student for a Course.  
//NOTE: Ideally, the storage access must be decoupled in a separate class
//as we will demonstrate in module 4.
package domain;
import java.util.*;
import java.io.*;
public class RegisterService {
   public RegisterService() {}
   //This method finds a specified Course object
   public Course getCourse(String semester, String number, String path) {
      //Delegate to the course service
      CourseService courseSvc=new CourseService();
      return courseSvc.getCourse(semester, number, path);
   }
   public Student createStudent(String name,String address,
         String city,String state,String zipCode) {
      return new Student(-1,name,address,city,state,zipCode);}
   public void register(Course course, Student student, String path) 
         throws IOException {
      BufferedWriter buffer;
      try {
         //Store the Student object into Students.txt file
         buffer=new BufferedWriter(new FileWriter(path+"Students.txt",true));
         buffer.write(student.getName()+" "+ student.getAddress()+ 
            " "+student.getCity()+" "+                      
            student.getState()+" "+student.getZipCode());
        buffer.newLine();
        buffer.close();
        buffer=new BufferedWriter(
                 new FileWriter(path+"Registrations.txt",true));
        buffer.write(student.getName()+" "+course.getTitle());
        buffer.newLine();
        buffer.close();
     }
     catch (IOException exception) {}
   }
}
//CourseService.java 
//This object performs Course services, such as retrieving a Course object
// from the Courses.txt file, or creating a new Course object.
//NOTE: Ideally, the storage access must be decoupled in a separate class
//as we will demonstrate in module 4.
package domain;
import java.util.*;
import java.io.*;
public class CourseService {
   //This method finds a specified Course object in the Courses.txt file.
   public Course getCourse(String semester, String number, String path) {
      Course course=null;
      String sem;
      String num;
      String ttl;
      try {
         Scanner scanner=new Scanner(new FileReader(path+"Courses.txt"));
         while (scanner.hasNext()){
            sem=scanner.next();
            num=scanner.next();
            ttl=scanner.nextLine();
	    if (sem.equals(semester) && num.equals(number)) {
	        course=new Course(-1,sem,num,ttl);
                break;
	    }
         }
      }
      catch (FileNotFoundException exception) {}
      return course;
   }
   //This method adds a new Course object to the Courses.txt file.
   public Course createCourse(String semester, String number, 
         String title, String path) {
      Course course=new Course(-1,semester,number,title);
      BufferedWriter buffer;
      try {
         buffer=new BufferedWriter(new FileWriter(path+"Courses.txt",true));
         buffer.write(semester+" "+number+" "+title);
         buffer.newLine();
         buffer.close();
      }
      catch (IOException exception) {}
      return course;
   }
}