src/java/org/mxchange/pizzaapplication/beans/basket/BasketWebSessionBean.java

   1 /*
   2  * Copyright (C) 2016 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.beans.basket;
  18
  19 import java.text.MessageFormat;
  20 import java.util.List;
  21 import javax.enterprise.context.SessionScoped;
  22 import javax.faces.FacesException;
  23 import javax.faces.view.facelets.FaceletException;
  24 import javax.inject.Named;
  25 import javax.naming.Context;
  26 import javax.naming.InitialContext;
  27 import javax.naming.NamingException;
  28 import org.mxchange.jshopcore.exceptions.BasketItemAlreadyAddedException;
  29 import org.mxchange.jshopcore.model.basket.AddableBasketItem;
  30 import org.mxchange.jshopcore.model.basket.Basket;
  31 import org.mxchange.jshopcore.model.basket.BasketSessionBeanRemote;
  32 import org.mxchange.jshopcore.model.basket.ShopBasket;
  33 import org.mxchange.jshopcore.model.basket.items.BasketItem;
  34 import org.mxchange.jshopcore.model.product.Product;
  35
  36 /**
  37  * A bean for the basket
  38  * <p>
  39  * @author Roland Haeder<roland@mxchange.org>
  40  */
  41 @Named ("basketController")
  42 @SessionScoped
  43 public class BasketWebSessionBean implements BasketWebSessionController {
  44
  45         /**
  46          * Serial number
  47          */
  48         private static final long serialVersionUID = 5_476_347_320_198L;
  49
  50         /**
  51          * Instance of wrapped basket
  52          */
  53         private final Basket<AddableBasketItem> basket;
  54
  55         /**
  56          * Basket bean
  57          */
  58         private final BasketSessionBeanRemote basketBean;
  59
  60         /**
  61          * Current item
  62          */
  63         private AddableBasketItem currentItem;
  64
  65         /////////////////////// Properties /////////////////////
  66         /**
  67          * Ordered orderedAmount
  68          */
  69         private Long orderedAmount;
  70
  71         /**
  72          * Default constructor
  73          */
  74         public BasketWebSessionBean () {
  75                 // Get new application instance
  76                 this.basket = new ShopBasket();
  77
  78                 try {
  79                         // Get initial context
  80                         Context context = new InitialContext();
  81
  82                         // Try to lookup
  83                         this.basketBean = (BasketSessionBeanRemote) context.lookup("ejb/stateless-basket"); //NOI18N
  84                 } catch (final NamingException ex) {
  85                         // Continue to throw
  86                         throw new FaceletException(ex);
  87                 }
  88         }
  89
  90         @Override
  91         public String addItem (final Product product) {
  92                 // Trace message
  93                 //this.getLogger().logTrace(MessageFormat.format("addItem: product={0} - CALLED!", product));
  94
  95                 // product should not be null
  96                 if (null == product) {
  97                         // Abort here
  98                         throw new NullPointerException("product is null");
  99                 }
 100
 101                 // Generate item instance
 102                 AddableBasketItem item = new BasketItem(product, this.getOrderedAmount());
 103
 104                 // Is orderedAmount set?
 105                 if (this.getOrderedAmount() == null) {
 106                         // Trace message
 107                         //this.getLogger().logTrace("addItem: orderedAmount not specified, returning null ... - EXIT!");
 108
 109                         // No orderedAmount specified?!
 110                         return null;
 111                 }
 112
 113                 try {
 114                         // item should not be null
 115                         if (null == item) {
 116                                 // Abort here
 117                                 throw new NullPointerException("item is null"); //NOI18N
 118                         }
 119
 120                         // Deligate to model
 121                         this.basket.addItem(item);
 122
 123                         // Remove orderedAmount
 124                         this.setOrderedAmount(null);
 125
 126                         // Trace message
 127                         //this.getLogger().logTrace(MessageFormat.format("addItem: item {0} - has been added to basket. - EXIT!", item));
 128                         // Added
 129                         return "item_added"; //NOI18N
 130                 } catch (final BasketItemAlreadyAddedException ex) {
 131                         // Throw unchecked exception
 132                         throw new FacesException(ex);
 133                 }
 134         }
 135
 136         @Override
 137         public List<AddableBasketItem> allItems () {
 138                 // Trace message
 139                 //this.getLogger().logTrace("allItems: CALLED!");
 140
 141                 // Deligate to basket instance
 142                 List<AddableBasketItem> list = this.basket.getAll();
 143
 144                 // Trace message
 145                 //this.getLogger().logTrace(MessageFormat.format("allItems: list={0} - EXIT!", list));
 146                 // Return it
 147                 return list;
 148         }
 149
 150         @Override
 151         public Float calculateCurrentItemPrice () {
 152                 // Trace message
 153                 //this.getLogger().logTrace("calculateCurrentItemPrice: CALLED!");
 154
 155                 // Is the current item/amount set?
 156                 if (this.getCurrentItem() == null) {
 157                         // Current item is null
 158                         throw new NullPointerException("currentItem is null"); //NOI18N
 159                 } else if (this.getCurrentItem().getItemProduct() == null) {
 160                         // Product is null
 161                         throw new NullPointerException("currentItem.product is null"); //NOI18N
 162                 } else if (this.getCurrentItem().getOrderedAmount() == null) {
 163                         // Amount is null
 164                         throw new NullPointerException("currentItem.amount is null"); //NOI18N
 165                 }
 166
 167                 // Caculate item's price
 168                 Float totalPrice = (this.getCurrentItem().getItemProduct().getProductPrice() * this.getCurrentItem().getOrderedAmount());
 169
 170                 // Trace message
 171                 //this.getLogger().logTrace(MessageFormat.format("calculateCurrentItemPrice: totalPrice={0} - EXIT!", totalPrice));
 172                 // Return it
 173                 return totalPrice;
 174         }
 175
 176         @Override
 177         public Float calculateItemPrice (final AddableBasketItem item) {
 178                 // Trace message
 179                 //this.getLogger().logTrace(MessageFormat.format("calculateItemPrice: item={0} - CALLED!", item));
 180
 181                 // item must not be null
 182                 if (null == item) {
 183                         // Abort here
 184                         throw new NullPointerException("item is null");
 185                 }
 186
 187                 // Default value
 188                 Float totalPrice = 0.0f;
 189
 190                 // Is it a product?
 191                 if (item.isProductType()) {
 192                         // Caculate item's price
 193                         totalPrice = (item.getItemProduct().getProductPrice() * item.getOrderedAmount());
 194                 }
 195
 196                 // Trace message
 197                 //this.getLogger().logTrace(MessageFormat.format("calculateItemPrice: totalPrice={0} - EXIT!", totalPrice));
 198                 // Return it
 199                 return totalPrice;
 200         }
 201
 202         @Override
 203         public Float calculateTotalPrice () {
 204                 // Trace message
 205                 //this.getLogger().logTrace("calculateTotalPrice: CALLED!");
 206
 207                 // Init total price
 208                 Float totalPrice = 0.0f;
 209
 210                 // Iterate over all items
 211                 for (final AddableBasketItem item : this.allItems()) {
 212                         // Is the item a product?
 213                         if (item.isProductType()) {
 214                                 // Calculate single price and add it
 215                                 totalPrice += this.calculateItemPrice(item);
 216                         }
 217                 }
 218
 219                 // Trace message
 220                 //this.getLogger().logTrace(MessageFormat.format("calculateTotalPrice: totalPrice={0} - EXIT!", totalPrice));
 221                 // Return final sum
 222                 return totalPrice;
 223         }
 224
 225         @Override
 226         public String doChangeItem (final AddableBasketItem item) {
 227                 // Trace message
 228                 //this.getLogger().logTrace(MessageFormat.format("doChangeItem: item={0} - CALLED!", item));
 229
 230                 // item shall not be null
 231                 if (null == item) {
 232                         // Abort here
 233                         throw new NullPointerException("item is null");
 234                 }
 235
 236                 // Default is not found
 237                 String targetPage = "item_not_changed"; //NOI18N
 238
 239                 // Lookup item in basket
 240                 for (final AddableBasketItem basketItem : this.allItems()) {
 241                         // Is it the same?
 242                         if (basketItem.equals(item)) {
 243                                 // Found it, so allow redirect to proper page
 244                                 targetPage = "basket"; //NOI18N
 245                                 break;
 246                         }
 247                 }
 248
 249                 // Trace message
 250                 //this.getLogger().logTrace(MessageFormat.format("doChangeItem: targetPage={0} - EXIT!", targetPage));
 251                 // Return page
 252                 return targetPage;
 253         }
 254
 255         @Override
 256         public void clear () {
 257                 // @TODO Also clear EJB
 258                 // Deligate to basket instance
 259                 this.basket.clear();
 260         }
 261
 262         @Override
 263         public AddableBasketItem getCurrentItem () {
 264                 return this.currentItem;
 265         }
 266
 267         @Override
 268         public void setCurrentItem (final AddableBasketItem currentItem) {
 269                 this.currentItem = currentItem;
 270         }
 271
 272         @Override
 273         public Long getItemAmount (final Product product) {
 274                 // Trace message
 275                 //this.getLogger().logTrace(MessageFormat.format("getItemAmount: product={0} - CALLED!", product));
 276
 277                 // product should not be null
 278                 if (null == product) {
 279                         // Abort here
 280                         throw new NullPointerException("product is null");
 281                 }
 282
 283                 // Initial value is zero
 284                 Long itemAmount = 0L;
 285
 286                 // Iterate over all
 287                 for (final AddableBasketItem item : this.allItems()) {
 288                         // Debug message
 289                         //this.getLogger().logDebug(MessageFormat.format("getItemAmount: item={0}", item));
 290
 291                         // Is this product instance and same?
 292                         if (null == item) {
 293                                 // item is null
 294                                 throw new NullPointerException("item is null");
 295                         } else if ((item.isProductType()) && (item.getItemProduct().equals(product))) {
 296                                 // Found it
 297                                 itemAmount = item.getOrderedAmount();
 298                                 break;
 299                         }
 300                 }
 301
 302                 // Trace message
 303                 //this.getLogger().logTrace(MessageFormat.format("getItemAmount: itemAmount={0} - EXIT!", itemAmount));
 304                 // Return it
 305                 return itemAmount;
 306         }
 307
 308         @Override
 309         public AddableBasketItem getLast () {
 310                 // Deligate to basket instance
 311                 return this.basket.getLast();
 312         }
 313
 314         @Override
 315         public int getLastNumRows () {
 316                 // Deligate to basket instance
 317                 return this.basket.getLastNumRows();
 318         }
 319
 320         @Override
 321         public Long getOrderedAmount () {
 322                 return this.orderedAmount;
 323         }
 324
 325         @Override
 326         public void setOrderedAmount (final Long orderedAmount) {
 327                 this.orderedAmount = orderedAmount;
 328         }
 329
 330         @Override
 331         public boolean hasItems () {
 332                 // Call above and invert it
 333                 return (!this.isEmpty());
 334         }
 335
 336         @Override
 337         public boolean isEmpty () {
 338                 // Deligate to basket instance
 339                 return this.basket.isEmpty();
 340         }
 341
 342         @Override
 343         public boolean isProductAdded (final Product product) {
 344                 // Trace message
 345                 //this.getLogger().logTrace(MessageFormat.format("isProductAdded: product={0} - EXIT!", product));
 346
 347                 // Must not be null
 348                 if (null == product) {
 349                         // Abort here
 350                         throw new NullPointerException("product is null"); //NOI18N
 351                 }
 352
 353                 // Generate fake instance
 354                 AddableBasketItem fake = new BasketItem(product);
 355
 356                 // Debug message
 357                 //this.getLogger().logDebug(MessageFormat.format("isProductAdded: fake={0}", fake));
 358                 // Ask bean about it
 359                 boolean isAdded = this.basket.isAdded(fake);
 360
 361                 // Debug message
 362                 //this.getLogger().logDebug(MessageFormat.format("isProductAdded: isAdded={0}", isAdded));
 363                 // Is it added?
 364                 if (isAdded) {
 365                         // Get item
 366                         AddableBasketItem item = this.getItemFromProduct(product);
 367
 368                         // Debug message
 369                         //this.getLogger().logDebug(MessageFormat.format("isProductAdded: item={0} - setting as current item.", item));
 370                         // Set this as current item
 371                         this.setCurrentItem(item);
 372                 }
 373
 374                 // Trace message
 375                 //this.getLogger().logTrace(MessageFormat.format("isProductAdded: isAdded={0} - EXIT!", isAdded));
 376                 // Return status
 377                 return isAdded;
 378         }
 379
 380         @Override
 381         public String outputLastAddedItem () {
 382                 // Trace message
 383                 //this.getLogger().logTrace("outputLastAddedItem: CALLED!");
 384
 385                 // Default message
 386                 String lastItem = ""; //NOI18N
 387
 388                 // Get instance
 389                 AddableBasketItem item = this.getLast();
 390
 391                 // Is it set?
 392                 if (item instanceof AddableBasketItem) {
 393                         // Get type
 394                         switch (item.getItemType()) {
 395                                 case "product": // Sellable product //NOI18N
 396                                         assert (item.getItemProduct() instanceof Product) : MessageFormat.format("item {0} has no product instance set.", item); //NOI18N
 397
 398                                         // Get title
 399                                         lastItem = item.getItemProduct().getProductTitle();
 400                                         break;
 401
 402                                 default: // Not supported
 403                                         throw new FacesException(MessageFormat.format("item type {0} is not supported.", item.getItemType())); //NOI18N
 404                         }
 405                 }
 406
 407                 // Trace message
 408                 //this.getLogger().logTrace(MessageFormat.format("outputLastAddedItem: lastItem={0} - EXIT!", lastItem));
 409                 // Return it
 410                 return lastItem;
 411         }
 412
 413         /**
 414          * Getter for basket bean instance
 415          * <p>
 416          * @return Basket bean instance
 417          */
 418         private BasketSessionBeanRemote getBasketBean () {
 419                 return this.basketBean;
 420         }
 421
 422         /**
 423          * Somewhat getter for an item instance from given product instance. This
 424          * method returns null if no item was found to given product. The product is
 425          * found by checking it's id and itemType=product
 426          * <p>
 427          * @param product Product instance
 428          * <p>
 429          * @return Item instance or null if not found
 430          */
 431         private AddableBasketItem getItemFromProduct (final Product product) {
 432                 // Trace message
 433                 //this.getLogger().logTrace(MessageFormat.format("getItemFromProduct: product={0} - CALLED!", product));
 434
 435                 // Product must not be null
 436                 if (null == product) {
 437                         // Abort here
 438                         throw new NullPointerException("product is null"); //NOI18N
 439                 }
 440
 441                 // Create item instance
 442                 AddableBasketItem foundItem = null;
 443
 444                 // Create fake instance
 445                 AddableBasketItem fake = new BasketItem(product);
 446
 447                 // Debug message
 448                 //this.getLogger().logDebug(MessageFormat.format("getItemFromProduct: fake={0}", fake));
 449                 // Get all items
 450                 List<AddableBasketItem> list = this.basket.getAll();
 451
 452                 // Debug message
 453                 //this.getLogger().logDebug(MessageFormat.format("getItemFromProduct: list={0}", list));
 454                 // Check all entries
 455                 for (final AddableBasketItem item : list) {
 456                         // Debug message
 457                         //this.getLogger().logDebug(MessageFormat.format("getItemFromProduct: item={0}", item));
 458
 459                         // item must not be null
 460                         if (null == item) {
 461                                 // Abort here
 462                                 throw new NullPointerException("item is null"); //NOI18N
 463                         }
 464
 465                         // Is it the same?
 466                         if (item.equals(fake)) {
 467                                 // Set found item and abort look
 468                                 foundItem = item;
 469                                 break;
 470                         }
 471                 }
 472
 473                 // Trace message
 474                 //this.getLogger().logTrace(MessageFormat.format("getItemFromProduct: foundItem={0} - EXIT!", foundItem));
 475                 // Return it
 476                 return foundItem;
 477         }
 478 }