cartmodel.java

一个优秀的供应商管理系统

package apusic.myshop.cart.model;



import java.io.Serializable;
import java.util.Iterator;
import java.util.Collection;
import apusic.myshop.util.Debug;

public class CartModel {

  private Collection items;

  public CartModel(Collection items) {
    this.items = items;
  }

  public int getSize() {
    if (items != null) return items.size();
    else return 0;
  }


    /** @return an collection of all the CartItems. */
  public Collection getCart() {
    return items;
  }

  /** @return an iterator over all the CartItems. */
  public Iterator getItems() {
    return items.iterator();
  }

  public double getTotalCost() {
    double total = 0;
    for (Iterator li = getItems(); li.hasNext(); ) {
      CartItem item = (CartItem) li.next();
      total += item.getTotalCost();
    }
    return total;
  }

  /**
    * copies over the data from the specified shopping cart. Note
    * that it is a shallow copy.
    */
  public void copy(CartModel src) {
    this.items = src.items;
  }
}