shoppingcartbean.java

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/*
* @author                        : Neelesh
* @Version                       : 1.0
*
* Development Environment        : Oracle9i JDeveloper
* Name of the File               : ShoppingCartBean.java
* Creation/Modification History  :
*
* Neelesh    04-Oct-2002      Created
*
*/
package oracle.otnsamples.vsm.services;
// EJB
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;

import javax.ejb.CreateException;
import javax.ejb.EJBException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;

import oracle.otnsamples.util.KeyFactory;
import oracle.otnsamples.util.ServiceLocator;
import oracle.otnsamples.util.Utilities;
import oracle.otnsamples.vsm.Constants;
import oracle.otnsamples.vsm.entities.CustomerLocal;
import oracle.otnsamples.vsm.entities.CustomerLocalHome;
import oracle.otnsamples.vsm.entities.ItemDetailLocal;
import oracle.otnsamples.vsm.entities.ItemDetailLocalHome;
import oracle.otnsamples.vsm.entities.ItemDetailPK;
import oracle.otnsamples.vsm.entities.ItemLocal;
import oracle.otnsamples.vsm.entities.ItemLocalHome;
import oracle.otnsamples.vsm.entities.OrderItemLocal;
import oracle.otnsamples.vsm.entities.OrderItemLocalHome;
import oracle.otnsamples.vsm.entities.ProductOrderLocal;
import oracle.otnsamples.vsm.entities.ProductOrderLocalHome;
import oracle.otnsamples.vsm.services.data.Address;
import oracle.otnsamples.vsm.services.data.CartItem;

/**
 * This is the implementation for  Shopping Cart Services.
 * The bean provides implementations for methods defined in the Shopping Cart 
 * interface. The bean is implemented as a stateful session bean to track a 
 * user's shopping cart. The bean interacts with various local entities to
 * manage persistence. The references to these entities can be found in ejb-jar.xml
 */

public class ShoppingCartBean implements SessionBean {

  
  // contents of the cart, a table of itemids v/s CartItem objects
  private HashMap cartContents;

  // the locale of the user
  public Locale userLocale;
  // shipping addreess for the items in cart
  private Address shippingAddress;

  // cart user
  private String userName;

  // Session context of the stateful bean
  private SessionContext context;
  /**
   * The business methods removes an item from the cart
   * @param <b>itemID</b> - id of the item to be removed
   * @throws <b>CartException</b> if the item cannot be removed
   */
  
  public void removeFromCart( String itemID ) throws CartException {
    // Remove the value from the table of 
    cartContents.remove( String.valueOf( itemID ) );
  }
  /**
   * The business methods changes the shipping address 
   * @param <b>address</b> - the new shipping address
   * @throws <b>CartException</b> if the shipping address cannot be changed
   */
  
  public void changeShippingAddress( Address address ) throws CartException {
    shippingAddress = address;
  }
  /**
   * The business methods checks out the cart
   * @return <b>String</b> - the checkout status
   * @throws <b>CartException</b> if checkout fails
   */
  
  public String checkout() throws CartException {
    if(userName==null){
      throw new CartException("Invalid user","error.cart.nulluser");
    }
    try {
      // Get all items in the cart
      CartItem[] cart = getCart();
      if(cart.length>0){
        // make sure that shipping address is set
        getShippingAddress();
        ItemLocalHome itemHome = getItemLocalHome();
        ProductOrderLocalHome productOrderHome = getOrderLocalHome();
        OrderItemLocalHome orderItemHome = getOrderItemLocalHome();
        // create a new product order with user name, current date
            
        ProductOrderLocal order = productOrderHome.create( KeyFactory.getKey(),
                                                        new Date(), userName );

        //set the shipping address for the order
        order.setPhone( shippingAddress.getPhone() );
        order.setCity( shippingAddress.getCity() );
        order.setCountry( shippingAddress.getCountry() );
        order.setShipToAddress( shippingAddress.getAddress() );
        order.setState( shippingAddress.getState() );
        order.setZip( new Integer( shippingAddress.getZip() ) );
        // Find the current order items, there will be none
        Collection orderItems = new ArrayList();
        // Failure message is initialized.
        String checkoutFailMessage = "";
        // For each item in the cart,
        String orderId = order.getId();
        // Orders are always accepted at checkout time. The shop owner
        // will decide whether to approve or reject the orders
        
        for( int i = cart.length-1;i >=0 ;i-- ) {
          try{
            // create an order item for the item
            OrderItemLocal orderItem = orderItemHome.create(cart[i].getId(),
                                           orderId, cart[i].getShopId(),
                                           Constants.PURCHASED,
                                           cart[i].getQuantity(),
                                           cart[i].getUnitPrice());
            orderItem.setShopID(cart[i].getShopId());
            orderItems.add( orderItem );
            
            // remove checked out item from cart
            cartContents.remove( cart[i].getId());
          }catch(EJBException ex){
            checkoutFailMessage += cart[i].getItemName() + ",";
          }
        }
        // after creating order items, set them to product order to maintain 
        //Order-OrderItem relation
        order.setOrderItems( orderItems );
        // If all the items could not be processed, a few items were left out
        if( checkoutFailMessage.length() != 0 ) {
          // Remove the , at the end
          checkoutFailMessage = checkoutFailMessage.
                                    substring(0,checkoutFailMessage.length()-1);
          return Utilities.loadParams("CartMessages_"+userLocale.getLanguage()).
                    getProperty("error.checkout.outofstock")+checkoutFailMessage;
        }
        else {// check out successful 
          return null;
        }
      }else{
          return Utilities.loadParams("CartMessages_"+userLocale.getLanguage())
                                      .getProperty("error.checkout.emptycart");
      }
    }
    catch( Exception ex ) {
      context.setRollbackOnly();
      ex.printStackTrace();
      //unknown error has occurred, rollback all database txns
      throw new CartException( "Unable to checkout cart because " + 
                                ex.getMessage(),"error.cart.checkoutfail" );
    }
  }
  /**
   * Gets the username for the cart
   * @return <b>String </b> username
   */
  
  public String getUserName() {
    return userName;
  }
  /**
   * The business methods adds an item to the cart
   * @param <b>itemID</b> - id of the item to be added
   * @param <b>qty</b> quantity to be added
   * @throws <b>CartException</b> if the item cannot be added
   */
  
  public void addToCart( String itemID, int qty ) throws CartException {
    try {
      CartItem cartItem = null;
      // Check if this item is already there in the cart
      if( cartContents.containsKey( itemID  ) ) {
        cartItem = (CartItem)cartContents.get( itemID  );
      }
      else {
        // If it is not there, create a new cart item
        cartItem = new CartItem();
        // find Item Entity for the id provided
        ItemLocalHome itemhome = (ItemLocalHome)ServiceLocator.getLocator().
                                    getService( "java:comp/env/ejb/ItemLocal" );
        ItemLocal item = itemhome.findByPrimaryKey(  itemID );
        ItemDetailLocalHome home = getItemDetailLocalHome();
        ItemDetailLocal itemDetail = home.findByPrimaryKey
                            (new ItemDetailPK(itemID,userLocale.getLanguage()));
        // set the cart items name, andd unit price
        cartItem.setItemName( itemDetail.getName());
        cartItem.setUnitPrice( itemDetail.getUnitPrice().doubleValue());
        cartItem.setShopId(item.getShopID());
        // place the new item in cart
        cartContents.put( itemID, cartItem );
      }
      // set the id of the item
      cartItem.setId( itemID );