boss.java

源码为科学出版社出版的英文<java设计模式>(影印版)所用的所有例子程序

import java.util.*;

public class Boss
    extends Employee {
  Vector employees;

  public Boss(String _name, float _salary) {
    super(_name, _salary);
    leaf = false;
    employees = new Vector();
  }

//--------------------------------------
  public Boss(Employee _parent, String _name, float _salary) {
    super(_parent, _name, _salary);
    leaf = false;
    employees = new Vector();
  }

  //--------------------------------------
  public boolean add(Employee e) throws NoSuchElementException {
    employees.add(e);
    return true;
  }

  //--------------------------------------
  public void remove(Employee e) throws NoSuchElementException {
    employees.removeElement(e);
  }

  //--------------------------------------
  public Enumeration subordinates() {
    return employees.elements();
  }

  //--------------------------------------
  public Employee getChild(String s) throws NoSuchElementException {

    Employee newEmp = null;

    if (getName().equals(s)) {
      return this;
    }
    else {
      boolean found = false;
      Enumeration e = subordinates();
      while (e.hasMoreElements() && (!found)) {
        newEmp = (Employee) e.nextElement();
        found = newEmp.getName().equals(s);
        if (!found) {
          if (!newEmp.isLeaf()) {
            newEmp = newEmp.getChild(s);
          }
          else {
            newEmp = null;
          }
          found = (newEmp != null);
        }
      }
      if (found) {
        return newEmp;
      }
      else {
        return null;
      }
    }
  }

  //--------------------------------------
  public float getSalaries() {
    float sum = salary;
    for (int i = 0; i < employees.size(); i++) {
      sum += ( (Employee) employees.elementAt(i)).getSalaries();
    }
    return sum;
  }

}