package com.jspdev.cart;

import java.io.*;
import java.math.*;
import com.jspdev.vo.*;

/**
 *代表了購物車中各個item的信息
 */
public class CartItem implements Serializable {

  /* Private Fields */

  private Item item;
  private int quantity;
  private boolean inStock;
  private BigDecimal total;

  /* JavaBeans Properties */

  public boolean isInStock() { return inStock; }
  public void setInStock(boolean inStock) { this.inStock = inStock; }

  public BigDecimal getTotal() { return total; }

  public Item getItem() { return item; }
  public void setItem(Item item) {
    this.item = item;
    calculateTotal();
  }

  public int getQuantity() { return quantity; }
  public void setQuantity(int quantity) {
    this.quantity = quantity;
    calculateTotal();
  }

  /* Public methods */

  public void incrementQuantity() {
    quantity++;
    calculateTotal();
  }

  /**
   * 計算item的金額
   */

  private void calculateTotal() {
    if (item != null && item.getListPrice() != null) {
      total = item.getListPrice().multiply(new BigDecimal(quantity));
    } else {
      total = null;
    }
  }

}