mallnavigationbean.java

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/*
 * @author                        : Neelesh
 * @Version                       : 1.0
 *
 * Development Environment        : Oracle 9i JDeveloper
 * Name of the File               : MallNavigationBean.java
 * Creation/Modification History  :
 *
 * Neelesh    30-Dec-2002      Created
 *
 */
package oracle.otnsamples.vsm.services;


// Data structures
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.TreeMap;

import javax.ejb.FinderException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;

import javax.naming.NamingException;

import oracle.otnsamples.util.KeyFactory;
import oracle.otnsamples.util.ServiceLocator;
import oracle.otnsamples.vsm.Constants;
import oracle.otnsamples.vsm.entities.CategoryAttributeLocal;
import oracle.otnsamples.vsm.entities.CategoryLocal;
import oracle.otnsamples.vsm.entities.CategoryLocalHome;
import oracle.otnsamples.vsm.entities.CountryLocal;
import oracle.otnsamples.vsm.entities.CountryLocalHome;
import oracle.otnsamples.vsm.entities.GuestbookLocalHome;
import oracle.otnsamples.vsm.entities.InventoryLocalHome;
import oracle.otnsamples.vsm.entities.ItemAttributeLocal;
import oracle.otnsamples.vsm.entities.ItemAttributeLocalHome;
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.ShopDetailLocal;
import oracle.otnsamples.vsm.entities.ShopDetailLocalHome;
import oracle.otnsamples.vsm.entities.ShopDetailPK;
import oracle.otnsamples.vsm.entities.ShopLocal;
import oracle.otnsamples.vsm.entities.ShopLocalHome;
import oracle.otnsamples.vsm.entities.SubCategoryLocal;
import oracle.otnsamples.vsm.entities.SubCategoryLocalHome;
import oracle.otnsamples.vsm.services.data.Category;
import oracle.otnsamples.vsm.services.data.Country;
import oracle.otnsamples.vsm.services.data.Guestbook;
import oracle.otnsamples.vsm.services.data.Item;
import oracle.otnsamples.vsm.services.data.Shop;
import oracle.otnsamples.vsm.services.data.ShopDetail;
import oracle.otnsamples.vsm.services.data.SubCategory;


/**
 * The service bean has implementations for remote methods related to mall
 * navigation functionality.The bean provides implementations for methods to
 * get shop details, item details and subcategories
 */
public class MallNavigationBean implements SessionBean {
  /**
   * Default create method
   */
  public void ejbCreate() {
  }
  /**
   * Container call back, called just after instance of this bean is activated
   */
  public void ejbActivate() {
  }
  /**
   * Container call back, called just before instance of this bean is
   * passivated
   */
  public void ejbPassivate() {
  }
  /**
   * Container call back, called by container before it ends the life of the
   * session object.
   */
  public void ejbRemove() {
  }
  /**
   * Set the associated session context.  The container calls this method after
   * the instance creation.
   *
   * @param ctx - A SessionContext interface for the instance.
   */
  public void setSessionContext(SessionContext ctx) {
  }
  /**
   * The service method returns an array of shops in a given category, with the
   * details of the shops in the given language
   *
   * @param <b>catID</b> The category id
   * @param <b>langID</b> The language in which details should be retrieved
   *
   * @return <b>Shop[]</b> an array of Shop value objects
   *
   * @throws ShopException if there was a problem finding shops
   */
  public Shop[] findShopsInCategory(String catID, String langID)
                             throws ShopException {

    if(
       (catID == null) || "".equals(catID.trim()) || (langID == null) ||
         "".equals(langID.trim())) {
      throw new ShopException(
                              "Cat id/lang id is empty or null",
                              "error.shop.null");
    }

    try {

      ShopLocalHome shopHome      = getShopLocalHome();
      Collection shopCollection   = shopHome.findByCategory(catID);
      Iterator shopIter           = shopCollection.iterator();
      ShopLocal shopBean          = null;
      Shop shop                   = null;
      Collection shopList         = new ArrayList();
      Collection detailCollection = null;
      ShopDetailLocal detailBean  = null;
      List shopDetailList         = null;

      while(shopIter.hasNext()) {
        try{
          shopBean   = (ShopLocal) shopIter.next();
          // if the shop is approved, add it to the list
          if(Constants.APPROVED.equals(shopBean.getStatus())){
          // find shop details for the language
            detailBean =
              getShopDetailLocalHome().findByPrimaryKey(new ShopDetailPK(
                                                                         shopBean.getId(),
                                                                         langID));
            shop       = new Shop();
            shop.setId(shopBean.getId());
            shop.setCategoryId(shopBean.getCatID());
            shop.setRegDate(shopBean.getRegDate());
            shop.setStatus(shopBean.getStatus());
            shop.setUserName(shopBean.getOwnerName());
            detailCollection   = shopBean.getShopDetails();
            shopDetailList     = new ArrayList();
        
            shop.addShopDetail(new ShopDetail(
                                            detailBean.getLangID(),
                                            detailBean.getShopName(),
                                            detailBean.getDescription()));

            shopList.add(shop);
          }
        }catch(FinderException ex){
          // no details for this shop in this language, continue processing with
          // next shop.
        }
      }
      return (Shop[]) shopList.toArray(new Shop[ shopList.size() ]);
    } catch(FinderException ex) {
      ex.printStackTrace();

      return new Shop[ 0 ];
    } catch(Exception ex) {
      ex.printStackTrace();
      throw new ShopException(
                              "Unable to retrieve shops in category because " +
                              ex.getMessage(), "error.shop.searchincat");
    }
  }
  /**
   * The service method returns an array of items in a given category, with the
   * details of the items in the given language
   *
   * @param <b>catID</b> The category id
   * @param <b>langID</b> The language in which details should be retrieved
   *
   * @return <b>Item[]</b> an array of Item value objects
   *
   * @throws ItemException if there was a problem finding items
   */
  public Item[] findItemsInSubCategory(String subCatID, String langID)
                                throws ItemException {

    if(
       (subCatID == null) || "".equals(subCatID.trim()) || (langID == null) ||
         "".equals(langID.trim())) {
      throw new ItemException(
                              "sub Cat id/lang id is empty or null",
                              "error.item.null");
    }

    try {

      ItemLocalHome itemHome    = getItemLocalHome();
      Collection itemCollection = itemHome.findBySubCategory(subCatID, langID);
      Iterator iter             = itemCollection.iterator();
      List itemList             = new ArrayList();

      while(iter.hasNext()) {
        itemList.add(createItemValueObject((ItemLocal) iter.next(), langID));
      }

      return (Item[]) itemList.toArray(new Item[ itemList.size() ]);
    } catch(Exception ex) {
      throw new ItemException(
                              "Unable to retrieve items because " +
                              ex.getMessage(), "error.item.iteminsubcat");
    }
  }
  /**
   * The service method returns an array of subcategories in a given shop,with
   * the  details of the subcategories in the given language
   *
   * @param <b>catID</b> The category id
   * @param <b>langID</b> The language in which details should be retrieved
   *
   * @return <b>SubCategory[]</b> an array of SubCategory value objects
   *
   * @throws CategoryException if there was a problem finding sub categories
   */
  public SubCategory[] findSubCategoriesInShop(String shopID, String langID)
                                        throws CategoryException {

    if(
       (shopID == null) || "".equals(shopID.trim()) || (langID == null) ||
         "".equals(langID.trim())) {
      throw new CategoryException(
                                  "Shop id/lang id is empty or null",
                                  "error.subcategory.null");
    }

    try {

      SubCategoryLocalHome subHome = getSubCategoryLocalHome();
      Collection subcatCollection  =
        subHome.findByShopAndLanguage(shopID, langID);
      Iterator subcatIter         = subcatCollection.iterator();
      SubCategoryLocal subcatBean = null;
      SubCategory subcat          = null;
      Collection subcatList       = new ArrayList();

      while(subcatIter.hasNext()) {
        subcatBean = (SubCategoryLocal) subcatIter.next();
        subcatList.add(new SubCategory(
                                       subcatBean.getSubCatID(),
                                       subcatBean.getShopID(),
                                       subcatBean.getSubCatName(),
                                       subcatBean.getCatID(),
                                       subcatBean.getLangID()));
      }

      return (SubCategory[]) subcatList.toArray(new SubCategory[ subcatList.size() ]);
    } catch(Exception ex) {
      ex.printStackTrace();
      throw new CategoryException(
                                  "Unable to retrieve sub categories for " +
                                  " shop, because " + ex.getMessage(),
                                  "error.subcategory.subcatsinshop");
    }
  }
  /**
   * The service method returns an array of top items in a given shop, with the
   * details of the items in the given language
   *
   * @param <b>catID</b> The category id
   * @param <b>langID</b> The language in which details should be retrieved
   *
   * @return <b>Item[]</b> an array of Item value objects
   *
   * @throws ItemException if there was a problem finding items
   */
  public Item[] getTopItemsInShop(String shopID, String langID)
                           throws ItemException {

    if(
       (shopID == null) || "".equals(shopID.trim()) || (langID == null) ||
         "".equals(langID.trim())) {
      throw new ItemException(
                              "Shop id/lang id is empty or null",
                              "error.item.null");
    }

    try {

      ItemLocalHome itemHome    = getItemLocalHome();
      Collection itemCollection =
        itemHome.findTopItemsInShop(shopID, langID, 4);

      Iterator iter = itemCollection.iterator();
      List itemList = new ArrayList();

      while(iter.hasNext()) {
        itemList.add(createItemValueObject((ItemLocal) iter.next(), langID));
      }

      return (Item[]) itemList.toArray(new Item[ itemList.size() ]);
    } catch(Exception ex) {
      throw new ItemException(
                              "Unable to retrieve items because " +
                              ex.getMessage(), "error.item.topitems");
    }
  }
  /**
   * The service method returns an array of items matching the keyword with the
   * details of the items in the given language
   *
   * @param <b>keword</b> The keyword
   * @param <b>String</b> The language in which details should be retrieved
   *
   * @return <b>Item[]</b> an array of Item value objects
   *
   * @throws ItemException if there was a problem finding items
   */
  public Item[] searchItem(String keyword, String langID)
                    throws ItemException {

    if((langID == null) || "".equals(langID.trim())) {
      throw new ItemException("Lang id is empty or null", "error.item.null");
    }

    if((keyword == null) || "".equals(keyword.trim())) {

      return new Item[ 0 ];
    }

    try {

      ItemLocalHome itemHome    = getItemLocalHome();
      Collection itemCollection =
        itemHome.findByKeyword("%" + keyword + "%", langID);

      Iterator iter = itemCollection.iterator();
      List itemList = new ArrayList();

      while(iter.hasNext()) {
        itemList.add(createItemValueObject((ItemLocal) iter.next(), langID));
      }

      return (Item[]) itemList.toArray(new Item[ itemList.size() ]);
    } catch(Exception ex) {
      throw new ItemException(
                              "Unable to retrieve items because " +
                              ex.getMessage(), "error.item.search");
    }
  }

  /*
   * Method to get the home for ItemDetailLocal bean
   */
  private ItemDetailLocalHome getItemDetailLocalHome()
                                              throws NamingException {