orderitem.java

Java EE 5 许多新功能都包含经过修补的 EJB 架构

/*
 * Copyright 2006 Borys Burnayev
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.rdacorp.petstore.domain;

import java.math.BigDecimal;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
import javax.persistence.Version;

/**
 * @author Borys Burnayev
 */
@Entity
@Table(name = "order_item")
@SequenceGenerator(name = "OrderItemSeq", sequenceName = "sq_order_item")
public class OrderItem {

   private Integer orderItemId;

   private long quantity;

   private BigDecimal extendedPrice;

   private Order order;

   private Item item;

   private int version;

   @Column(name = "row_version")
   @Version
   public int getVersion() {
      return version;
   }

   public void setVersion(int version) {
      this.version = version;
   }

   public OrderItem(long quantity, Order order, Item item) {
      this.quantity = quantity;
      this.order = order;
      this.item = item;
      updateExtendedPrice();
   }

   public OrderItem(long quantity, Item item) {
      this.quantity = quantity;
      this.item = item;
      updateExtendedPrice();
   }

   public OrderItem() {
   }

   @Id
   @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "OrderItemSeq")
   @Column(name = "order_item_sysid")
   public Integer getOrderItemId() {
      return this.orderItemId;
   }

   public void setOrderItemId(Integer orderItemId) {
      this.orderItemId = orderItemId;
   }

   @Column(name = "quantity")
   public long getQuantity() {
      return this.quantity;
   }

   public void setQuantity(long quantity) {
      this.quantity = quantity;
      updateExtendedPrice();
   }

   @Column(name = "extended_price")
   public BigDecimal getExtendedPrice() {
      return this.extendedPrice;
   }

   public void setExtendedPrice(BigDecimal extendedPrice) {
      this.extendedPrice = extendedPrice;
   }

   @ManyToOne
   @JoinColumn(name = "order_summary_sysid")
   public Order getOrder() {
      return this.order;
   }

   public void setOrder(Order orderSummary) {
      this.order = orderSummary;
   }

   @ManyToOne
   @JoinColumn(name = "item_sysid")
   public Item getItem() {
      return this.item;
   }

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

   public String toString() {
      String id = orderItemId != null ? orderItemId.toString() : "<no ID>";
      return "Order Item " + id + ":\nQuantity: " + quantity + "\nExtended Price: " + extendedPrice + "\n" + order
               + item;
   }

   public boolean equals(Object object) {
      if (!(object instanceof OrderItem))
         return false;
      OrderItem orderItem = (OrderItem) object;
      return item.equals(orderItem.item);
   }

   public int hashCode() {
      return item.hashCode();
   }

   public void increaseQuantity(long quantity) {
      updateQuantity(quantity);
   }

   public void decreaseQuantity(long quantity) {
      updateQuantity(-quantity);
   }

   public void updateQuantity(long quantity) {
      this.quantity += quantity;
      updateExtendedPrice();
   }

   public void updateExtendedPrice() {
      if (item != null)
         extendedPrice = item.getPrice().multiply(new BigDecimal(this.quantity));
      else
         extendedPrice = new BigDecimal(0);
   }
}