www.pudn.com > SRS.rar > Faculty.java

// Faculty.java - Chapter 16 version. 
 
// Copyright 2000 by Jacquie Barker - all rights reserved. 
 
// An IMPLEMENTATION class. 
 
 
import java.util.*; 
import java.io.*; 
 
public class Faculty extends CollectionWrapper { 
	//------------ 
	// Attributes. 
	//------------ 
 
	// This Hashtable stores Professor object references, using 
	// the (String) ssn of the Professor as the key. 
 
	private Hashtable professors; 
 
	//---------------- 
	// Constructor(s). 
	//---------------- 
 
	public Faculty() { 
		// Instantiate a new Hashtable. 
 
		professors = new Hashtable(); 
	} 
 
	//----------------- 
	// Get/set methods. 
	//----------------- 
 
 
	//----------------------------- 
	// Miscellaneous other methods. 
	//----------------------------- 
 
	// Used for testing purposes. 
	 
	public void display() { 
		System.out.println("Faculty:"); 
		System.out.println(""); 
 
		// Step through the Hashtable and display all entries. 
 
		Enumeration e = professors.elements(); 
 
		while (e.hasMoreElements()) { 
			Professor p = (Professor) e.nextElement(); 
			p.display(); 
			System.out.println(""); 
		} 
	} 
 
	public void addProfessor(Professor p) { 
		professors.put(p.getSsn(), p); 
	} 
 
	public void parseData(String line) { 
		// We're going to parse tab-delimited records into 
		// four attributes -- name, ssn, title, and dept -- 
		// and then call the Professor constructor to fabricate a new 
		// professor. 
 
		// First, make a copy of the record. 
 
		String restOfLine = line; 
		int index = restOfLine.indexOf("\t"); 
		String name = restOfLine.substring(0, index); 
		restOfLine = restOfLine.substring(index+1); 
		index = restOfLine.indexOf("\t"); 
		String ssn = restOfLine.substring(0, index); 
		restOfLine = restOfLine.substring(index+1); 
		index = restOfLine.indexOf("\t"); 
		String title = restOfLine.substring(0, index); 
		String dept = restOfLine.substring(index+1); 
		 
		// Call the constructor ... 
		Professor p = new Professor(name, ssn, title, dept); 
		addProfessor(p); 
	} 
 
	public Professor findProfessor(String ssn) { 
		return (Professor) professors.get(ssn); 
	} 
 
	// We have to read a second file containing the teaching 
	// assignments. 
	// This next version is used when reading in the file that defines 
	// teaching assignments. 
 
	public void parseData2(String line) { 
		// We're going to parse tab-delimited records into 
		// two values, representing the professor's SSN 
		// and the section number that he/she is going to teach. 
 
		// First, make a copy of the record. 
 
		String restOfLine = line; 
		int index = restOfLine.indexOf("\t"); 
		String ssn = restOfLine.substring(0, index); 
 
		// The full section number is a concatenation of the 
		// course no. and section no., separated by a hyphen; 
		// e.g., "ART101 - 1". 
 
		String fullSectionNo = restOfLine.substring(index+1); 
 
		// Look these two objects up in the appropriate collections. 
		// Note that having made scheduleOfClasses a public 
		// static attribute of the SRS class helps! 
 
		Professor p = findProfessor(ssn);  
		Section s = SRS.scheduleOfClasses.findSection(fullSectionNo);  
		if (p != null && s != null) p.agreeToTeach(s); 
	} 
 
	// Test scaffold. 
	public static void main(String[] args) { 
		Faculty f = new Faculty(); 
		f.initializeObjects("Faculty.dat", true); 
 
		// We cannot test the next feature, because the code 
		// of parseData2() expects the SRS.scheduleOfClasses 
		// collection object to have been instantiated, but  
		// it will not have been if we are running this test 
		// scaffold instead. 
		// f.initializeObjects("TeachingAssignments.dat", false); 
 
		f.display(); 
	} 
}