package?cart;

import?java.util.*;
import?database.BookDetails;


public?class?ShoppingCart?{
????HashMap?items?=?null;
????int?numberOfItems?=?0;

????public?ShoppingCart（）?{
????????items?=?new?HashMap（）;
????}

????public?synchronized?void?add（String?bookId?BookDetails?book）?{
????????if?（items.containsKey（bookId））?{
????????????ShoppingCartItem?scitem?=?（ShoppingCartItem）?items.get（bookId）;
????????????scitem.incrementQuantity（）;
????????????System.out.println（“in?add?quantity?is?“?+?scitem.getQuantity（））;
????????}?else?{
????????????ShoppingCartItem?newItem?=?new?ShoppingCartItem（book）;
????????????items.put（bookId?newItem）;
????????????System.out.println（“in?add?quantity?is?“?+?newItem.getQuantity（））;
????????}

????????//??????numberOfItems++;
????}

????public?synchronized?void?remove（String?bookId）?{
????????if?（items.containsKey（bookId））?{
????????????ShoppingCartItem?scitem?=?（ShoppingCartItem）?items.get（bookId）;
????????????scitem.decrementQuantity（）;

????????????if?（scitem.getQuantity（）?<=?0）?{
????????????????items.remove（bookId）;
????????????}

????????????numberOfItems--;
????????}
????}

????public?synchronized?List?getItems（）?{
????????List?results?=?new?ArrayList（）;
????????Iterator?items?=?this.items.values（）
???????????????????????????????????.iterator（）;

????????while?（items.hasNext（））?{
????????????results.add（items.next（））;
????????}

????????return?（results）;
????}

????protected?void?finalize（）?throws?Throwable?{
????????items.clear（）;
????}

????public?synchronized?int?getNumberOfItems（）?{
????????numberOfItems?=?0;

????????for?（Iterator?i?=?getItems（）
??????????????????????????????.iterator（）;?i.hasNext（）;）?{
????????????ShoppingCartItem?item?=?（ShoppingCartItem）?i.next（）;
????????????numberOfItems?+=?item.getQuantity（）;
????????????System.out.println（“number?of?items?is?“?+?numberOfItems）;
????????}

????????return?numberOfItems;
????}

????public?synchronized?double?getTotal（）?{
????????double?amount?=?0.0;

????????for?（Iterator?i?=?getItems（）
??????????????????????????????.iterator（）;?i.hasNext（）;）?{
????????????ShoppingCartItem?item?=?（ShoppingCartItem）?i.next（）;
????????????BookDetails?bookDetails?=?（BookDetails）?item.getItem（）;

????????????amount?+=?（item.getQuantity（）?*?bookDetails.getPrice（））;
????????}

????????return?roundOff（amount）;
????}

????private?double?roundOff（double?x）?{
????????long?val?=?Math.round（x?*?100）;?//?cents

????????return?val?/?100.0;
????}

????public?synchronized?void?clear（）?{
????????System.err.println（“Clearing?cart.“）;
????????items.clear（）;
????????numberOfItems?=?0;
????}
}