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WaitList.java
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WaitList.java
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import java.util.*;
import java.io.*;
public class WaitList implements Serializable {
private static final long serialVersionUID = 1L;
private List orders = new LinkedList();
private static WaitList WaitList;
private WaitList() {
}
public static WaitList instance() {
if (WaitList == null) {
return (WaitList = new WaitList());
} else {
return WaitList;
}
}
public boolean insertOrder(Order order) {
orders.add(order);
return true;
}
public void removeOrder(Order order){
orders.remove(order);
}
public Iterator getOrders(){
return orders.iterator();
}
private void writeObject(java.io.ObjectOutputStream output) {
try {
output.defaultWriteObject();
output.writeObject(WaitList);
} catch(IOException ioe) {
ioe.printStackTrace();
}
}
private void readObject(java.io.ObjectInputStream input) {
try {
if (WaitList != null) {
return;
} else {
input.defaultReadObject();
if (WaitList == null) {
WaitList = (WaitList) input.readObject();
} else {
input.readObject();
}
}
} catch(IOException ioe) {
ioe.printStackTrace();
} catch(ClassNotFoundException cnfe) {
cnfe.printStackTrace();
}
}
public String toString() {
return orders.toString();
}
}