www.pudn.com > 23种设计模式的java实现.zip > Employee.java

/** 
 *  A Component with some common function implementation 
 *  You can abstract it. 
 */ 
import java.util.*; 
 
public class Employee { 
    String name; 
    float salary; 
    Vector subordinates; 
    boolean isLeaf; 
    Employee parent = null; 
 
    //------------------------------------------- 
    public Employee(String _name, float _salary) { 
        name = _name; 
        salary = _salary; 
        subordinates = new Vector(); 
        isLeaf = false; 
    } 
    //------------------------------------------- 
    public Employee(Employee _parent, String _name, float _salary) { 
        name = _name; 
        salary = _salary; 
        parent = _parent; 
        subordinates = new Vector(); 
        isLeaf = false; 
    } 
    //------------------------------------------- 
    public void setLeaf(boolean b) { 
        isLeaf = b;    //if true, do not allow children 
    } 
    //------------------------------------------- 
    public float getSalary() { 
        return salary; 
    } 
    //------------------------------------------- 
    public String getName() { 
        return name; 
    } 
    //------------------------------------------- 
    public boolean add(Employee e) { 
        if (! isLeaf) {  
            subordinates.addElement(e); 
        } 
        return isLeaf;    //false if unsuccessful 
    } 
    //------------------------------------------- 
    public void remove(Employee e) { 
        if (! isLeaf) { 
            subordinates.removeElement(e); 
        } 
    } 
    //------------------------------------------- 
    public Enumeration elements() { 
        return subordinates.elements(); 
    } 
    //------------------------------------------- 
    public Employee getChild(String s) { 
        Employee newEmp = null; 
 
        if(getName().equals(s)) { 
            return this; 
        } else { 
            boolean found = false; 
            Enumeration e = elements(); 
            while(e.hasMoreElements() && (! found)) {   
                newEmp = (Employee)e.nextElement(); 
                found = newEmp.getName().equals(s); 
                if (! found) { 
                    newEmp = newEmp.getChild(s); 
                    found =(newEmp != null); 
                } 
            } 
            if (found) { 
                return newEmp; 
            } else { 
                return null; 
            } 
        } 
    } 
    //------------------------------------------- 
    public float getSalaries() { 
        float sum = salary; 
        for(int i = 0; i < subordinates.size(); i++) { 
            sum += ((Employee)subordinates.elementAt(i)).getSalaries(); 
        } 
        return sum; 
    } 
     
}