CardList.java

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;


/**
 * This class creates a Show for a client holding a show name, clientID, and
 * start and end date for the show. creation
 * 
 * @author Matt Carlson, Jamison Czech, Slava Makharovich, Prashant Shrestha
 */

public class CardList implements Serializable{

	private static final long serialVersionUID = 1L;
	private static CardList cardList;
	private List cards = new LinkedList();

	/*
	 * Private constructor to create singleton
	 */
	private CardList() {
	}

	/**
	 * CardList singleton
	 * @return the CardList singleton object
	 */
	public static CardList instance() {
		if (cardList == null) {
			return (cardList = new CardList());
		} 
		else {
			return cardList;
		}
	}
	

	/**
	 * Adds a CreditCard to the collection
	 * @param creditCard
	 * @return a boolean indicating successful addition to collection
	 */
	public boolean insertCard(CreditCard creditCard) {
		cards.add(creditCard);
		return true;
	}
	
	/**
	 * searches for a credit card in the collection
	 * @param
	 * cardNumber
	 * @return
	 * a CreditCard if found or null if not found
	 */
	public CreditCard search(String cardNumber) {
		//if(cards.size() > 0) {
			for (Iterator iterator = cards.iterator(); iterator.hasNext(); ) {
		      CreditCard creditCard = (CreditCard) iterator.next();
		      if (creditCard.getCardNumber().equals(cardNumber)) {
		        return creditCard;
		      }
		    }
		//}
	    
	    return null;
	  }
	
	/**
	 * Getter for collection of cards
	 * @return an iterator for the card collection
	 */
	public Iterator getCards() {
		return cards.iterator();
	}
	
	/**
	 * removes a card with the given cardNumber from the collection
	 * @param cardNumber
	 * @return true if CreditCard exists in the collection, or false otherwise
	 */
	public boolean removeCard(String cardNumber) {
		CreditCard creditCard = search(cardNumber);
		if (creditCard == null) {
			return false;
		}
		else {
			return cards.remove(creditCard);
		}
	}
	
	/**
	 * write objects for serialization
	 * @param output stream
	 */
	private void writeObject(ObjectOutputStream output) {
	    try {
	      //output.defaultWriteObject();
	      output.writeObject(cardList);
	    } 
	    catch(IOException ioe) {
	      System.out.println(ioe);
	    }
	  }
	
	  /**
	   * read serialized object
	   * @param input stream
	   */
	private void readObject(ObjectInputStream input) {
		try {
			if (cardList != null) {
				return;
			} 
			else {
				//input.defaultReadObject();
				if (cardList == null) {
					cardList = (CardList) input.readObject();
				} 
				else {
					input.readObject();
				}
			}
		} 
		catch(IOException ioe) {
			System.out.println("in CardList readObject \n" + ioe);
		} 
		catch(ClassNotFoundException cnfe) {
				cnfe.printStackTrace();
		}
	}
	
	
	/**
	 * String of the card
	 */
	@Override
	public String toString() {
		return cards.toString();
	}

}