src/java/org/mxchange/pizzaapplication/filter/servlet/basket/BasketItemAddedFilter.java

   1 /*
   2  * Copyright (C) 2015 Roland Haeder
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.pizzaapplication.filter.servlet.basket;
  18
  19 import java.io.IOException;
  20 import java.lang.reflect.InvocationTargetException;
  21 import java.sql.SQLException;
  22 import java.text.MessageFormat;
  23 import javax.servlet.Filter;
  24 import javax.servlet.FilterChain;
  25 import javax.servlet.ServletException;
  26 import javax.servlet.ServletRequest;
  27 import javax.servlet.ServletResponse;
  28 import javax.servlet.http.HttpServletRequest;
  29 import javax.servlet.http.HttpServletResponse;
  30 import javax.servlet.http.HttpSession;
  31 import org.mxchange.jcore.exceptions.BadTokenException;
  32 import org.mxchange.jcore.exceptions.CorruptedDatabaseFileException;
  33 import org.mxchange.jshop.beans.basket.BasketBean;
  34 import org.mxchange.jshop.item.AddableBasketItem;
  35 import org.mxchange.pizzaapplication.filter.servlet.BaseServletFilter;
  36
  37 /**
  38  * A filter for handling added basket items
  39  *
  40  * @author Roland Haeder
  41  */
  42 public class BasketItemAddedFilter extends BaseServletFilter implements Filter {
  43
  44         @Override
  45         @SuppressWarnings ("unchecked")
  46         public void doFilter (final ServletRequest request, final ServletResponse response, final FilterChain chain) throws IOException, ServletException {
  47                 // Trace message
  48                 this.getLogger().trace(MessageFormat.format("request={0},response={1},chain={2} - CALLED!", request, response, chain)); //NOI18N
  49
  50                 // All must be set
  51                 if (null == request) {
  52                         // request is null
  53                         throw new NullPointerException("request is null"); //NOI18N
  54                 } else if (null == response) {
  55                         // response is null
  56                         throw new NullPointerException("response is null"); //NOI18N
  57                 } else if (null == chain) {
  58                         // chain is null
  59                         throw new NullPointerException("chain is null"); //NOI18N
  60                 }
  61
  62                 // Call doFilter to move on
  63                 chain.doFilter(request, response);
  64
  65                 // Get item instance from request
  66                 Object object = request.getAttribute("item"); //NOI18N
  67
  68                 // Debug message
  69                 this.getLogger().debug(MessageFormat.format("object={0}", object)); //NOI18N
  70
  71                 // item should not be null
  72                 if (null == object) {
  73                         // item is null
  74                         throw new NullPointerException("object is null"); //NOI18N
  75                 } else if (!(object instanceof AddableBasketItem)) {
  76                         // Not right instance
  77                         throw new IllegalArgumentException("object does not implement AddableBasketItem"); //NOI18N
  78                 }
  79
  80                 // Now it is secure to cast
  81                 AddableBasketItem item = (AddableBasketItem) object;
  82
  83                 // Debug message
  84                 this.getLogger().debug(MessageFormat.format("item.id={0},item.itemId={1},item.itemType={2},item.amount={3}", item.getId(), item.getItemId(), item.getItemType(), item.getAmount())); //NOI18N
  85
  86                 try {
  87                         // Cast to servlet request
  88                         HttpServletRequest servletRequest = (HttpServletRequest) request;
  89
  90                         // Get session instance
  91                         HttpSession session = servletRequest.getSession();
  92
  93                         // Debug message
  94                         this.getLogger().debug(MessageFormat.format("session={0}", session)); //NOI18N
  95
  96                         // Should not be null
  97                         if (null == session) {
  98                                 // session is null
  99                                 throw new NullPointerException("session is null"); //NOI18N
 100                         }
 101
 102                         // Get basket instance
 103                         BasketBean basket = (BasketBean) session.getAttribute("basket"); //NOI18N
 104
 105                         // Debug message
 106                         this.getLogger().debug(MessageFormat.format("basket={0}", basket)); //NOI18N
 107
 108                         // Is the item already added?
 109                         if (item.getItemId() == null) {
 110                                 // Item id is not set
 111                                 throw new NullPointerException(MessageFormat.format("item id of item={0} is null", item)); //NOI18N
 112                         } else if (item.getItemType() == null) {
 113                                 // Item type is not set
 114                                 throw new NullPointerException(MessageFormat.format("item type of item={0} is null", item)); //NOI18N
 115                         } else if ((item.getAmount() == null) || (item.getAmount() == 0)) {
 116                                 // Debug message
 117                                 this.getLogger().debug(MessageFormat.format("Amount for item {0} is null - EXIT!", item)); //NOI18N
 118
 119                                 // Amount is not entered
 120                                 return;
 121                         } else if (basket.isItemAdded(item)) {
 122                                 // Yes, then throw exception here
 123                                 throw new ServletException(MessageFormat.format("item id={0} has already been added.", item.getItemId())); //NOI18N
 124                         }
 125
 126                         // Register item with it
 127                         basket.addItem(item);
 128
 129                         // Is amount null or zero?
 130                         if ((item.getAmount() == null) || (item.getAmount() == 0)) {
 131                                 // Then redirect to added=0
 132                                 ((HttpServletResponse) response).sendRedirect(servletRequest.getContextPath() + "/?add=0"); //NOI18N
 133                         } else {
 134                                 // Redirect to proper URL
 135                                 ((HttpServletResponse) response).sendRedirect(servletRequest.getContextPath() + "/?add=1"); //NOI18N
 136                         }
 137                 } catch (final SQLException | BadTokenException | CorruptedDatabaseFileException | NoSuchMethodException | IllegalAccessException | InvocationTargetException ex) {
 138                         // Continue to throw
 139                         throw new ServletException(ex);
 140                 }
 141
 142                 // Trace message
 143                 this.getLogger().trace("EXIT!"); //NOI18N
 144         }
 145
 146 }