Staff.java

package thinkinginjava.typeinfo;

import java.util.*;

public class Staff extends ArrayList<Position> {
	public void add(String title, Person person) {
		add(new Position(title, person));
	}

	public void add(String... titles) {
		for (String title : titles)
			add(new Position(title));
	}

	public Staff(String... titles) {
		add(titles);
	}

	public boolean positionAvailable(String title) {
		for (Position position : this)
			if (position.getTitle().equals(title)
					&& position.getPerson() == Person.NULL)
				return true;
		return false;
	}

	public void fillPosition(String title, Person hire) {
		for (Position position : this)
			if (position.getTitle().equals(title)
					&& position.getPerson() == Person.NULL) {
				position.setPerson(hire);
				return;
			}
		throw new RuntimeException("Position " + title + " not available");
	}

	public static void main(String[] args) {
		Staff staff = new Staff("President", "CTO", "Marketing Manager",
				"Product Manager", "Project Lead", "Software Engineer",
				"Software Engineer", "Software Engineer", "Software Engineer",
				"Test Engineer", "Technical Writer");
		staff.fillPosition("President", new Person("Me", "Last",
				"The Top, Lonely At"));
		staff.fillPosition("Project Lead", new Person("Janet", "Planner",
				"The Burbs"));
		if (staff.positionAvailable("Software Engineer"))
			staff.fillPosition("Software Engineer", new Person("Bob", "Coder",
					"Bright Light City"));
		System.out.println(staff);
	}
}