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Exam Solution: JSP, JSTL, MVC, Layered Architecture, etc
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‎README.md‎

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This is repository with the source code for Java course by Andrii Piatakha.
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It is not allowed to copy code and any commercial use (for example in other learning courses etc) without written approval from Andrii Piatakha.
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Only students of Andrii Piatakha can use these code examples.
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Thanks for respecting hard work of the author.
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2019 © Andrii Piatakha
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‎online-store.core/src/main/java/com/itbulls/learnit/onlinestore/core/CoreConfigurations.java‎

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package com.itbulls.learnit.onlinestore.core;
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public interface CoreConfigurations {
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Double REFFERER_REWARD_RATE = 0.02; // 2%
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}

‎online-store.core/src/main/java/com/itbulls/learnit/onlinestore/core/facades/CategoryFacade.java‎

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package com.itbulls.learnit.onlinestore.core.facades;
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import java.util.List;
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import com.itbulls.learnit.onlinestore.persistence.enteties.Category;
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public interface CategoryFacade {
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List<Category> getCategories();
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}

‎online-store.core/src/main/java/com/itbulls/learnit/onlinestore/core/facades/ProductFacade.java‎

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package com.itbulls.learnit.onlinestore.core.facades;
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import java.util.List;
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import com.itbulls.learnit.onlinestore.persistence.enteties.Product;
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public interface ProductFacade {
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List<Product> getProductsLikeName(String searchQuery);
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List<Product> getProductsByCategoryId(Integer id);
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List<Product> getProductsByCategoryIdForPageWithLimit(Integer categoryId, Integer page, Integer paginationLimit);
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Integer getNumberOfPagesForCategory(Integer categoryId, Integer paginationLimit);
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Integer getNumberOfPagesForSearch(String searchQuery, Integer paginationLimit);
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List<Product> getProductsLikeNameForPageWithLimit(String searchQuery, Integer page,
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Integer paginationLimit);
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Product getProductById(Integer parameter);
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}

‎online-store.core/src/main/java/com/itbulls/learnit/onlinestore/core/facades/PurchaseFacade.java‎

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package com.itbulls.learnit.onlinestore.core.facades;
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import java.util.List;
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import com.itbulls.learnit.onlinestore.persistence.enteties.Product;
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import com.itbulls.learnit.onlinestore.persistence.enteties.Purchase;
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import com.itbulls.learnit.onlinestore.persistence.enteties.User;
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public interface PurchaseFacade {
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Integer LAST_STATUS_OF_ORDER_FULFILMENT_ID = 6;
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void createPurchase(User attribute, Product productId);
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List<Purchase> getNotCompletedPurchases();
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void markFulfilmentStageForPurchaseIdAsCompleted(Integer purchaseId);
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}

‎online-store.core/src/main/java/com/itbulls/learnit/onlinestore/core/facades/UserFacade.java‎

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List<User> getUsers();
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User getUserById(Integer userId);
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void updateUser(User referrerUser);
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List<User> getReferralsForUser(User loggedInUser);
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}

‎online-store.core/src/main/java/com/itbulls/learnit/onlinestore/core/facades/impl/DefaultCategoryFacade.java‎

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package com.itbulls.learnit.onlinestore.core.facades.impl;
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import java.util.List;
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import com.itbulls.learnit.onlinestore.core.facades.CategoryFacade;
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import com.itbulls.learnit.onlinestore.persistence.dao.CategoryDao;
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import com.itbulls.learnit.onlinestore.persistence.dao.impl.MySqlJdbcCategoryDao;
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import com.itbulls.learnit.onlinestore.persistence.dto.converters.CategoryDtoToCategoryConverter;
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import com.itbulls.learnit.onlinestore.persistence.enteties.Category;
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public class DefaultCategoryFacade implements CategoryFacade {
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private static DefaultCategoryFacade instance;
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private CategoryDao categoryDao = new MySqlJdbcCategoryDao();
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private CategoryDtoToCategoryConverter categoryConverter = new CategoryDtoToCategoryConverter();
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public static synchronized DefaultCategoryFacade getInstance() {
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if (instance == null) {
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instance = new DefaultCategoryFacade();
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}
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return instance;
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}
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@Override
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public List<Category> getCategories() {
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return categoryConverter.convertCategoryDtosToCategories(categoryDao.getCategories());
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}
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}

‎online-store.core/src/main/java/com/itbulls/learnit/onlinestore/core/facades/impl/DefaultProductFacade.java‎

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package com.itbulls.learnit.onlinestore.core.facades.impl;
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import java.util.List;
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import com.itbulls.learnit.onlinestore.core.facades.ProductFacade;
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import com.itbulls.learnit.onlinestore.persistence.dao.ProductDao;
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import com.itbulls.learnit.onlinestore.persistence.dao.impl.MySqlJdbcProductDao;
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import com.itbulls.learnit.onlinestore.persistence.dto.converters.ProductDtoToProductConverter;
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import com.itbulls.learnit.onlinestore.persistence.enteties.Product;
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public class DefaultProductFacade implements ProductFacade {
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private static DefaultProductFacade instance;
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private ProductDao productDao = new MySqlJdbcProductDao();
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private ProductDtoToProductConverter productConverter = new ProductDtoToProductConverter();
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public static synchronized DefaultProductFacade getInstance() {
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if (instance == null) {
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instance = new DefaultProductFacade();
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}
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return instance;
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}
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@Override
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public List<Product> getProductsLikeName(String searchQuery) {
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return productConverter
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.convertProductDtosToProducts(productDao.getProductsLikeName(searchQuery));
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}
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@Override
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public List<Product> getProductsByCategoryId(Integer id) {
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return productConverter
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.convertProductDtosToProducts(productDao.getProductsByCategoryId(id));
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}
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@Override
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public List<Product> getProductsByCategoryIdForPageWithLimit(Integer categoryId, Integer page,
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Integer paginationLimit) {
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return productConverter
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.convertProductDtosToProducts(productDao.getProductsByCategoryIdPaginationLimit(categoryId, page, paginationLimit));
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}
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@Override
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public Integer getNumberOfPagesForCategory(Integer categoryId, Integer paginationLimit) {
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Integer totalProductsInCategory = productDao.getProductCountForCategory(categoryId);
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int pages = totalProductsInCategory / paginationLimit;
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if ( (totalProductsInCategory % paginationLimit) != 0) {
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pages++;
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}
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return pages;
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}
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@Override
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public Integer getNumberOfPagesForSearch(String searchQuery, Integer paginationLimit) {
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Integer totalProductsForSearch = productDao.getProductCountForSearch(searchQuery);
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int pages = totalProductsForSearch / paginationLimit;
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if ( (totalProductsForSearch % paginationLimit) != 0) {
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pages++;
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}
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return pages;
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}
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@Override
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public List<Product> getProductsLikeNameForPageWithLimit(String searchQuery, Integer page,
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Integer paginationLimit) {
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return productConverter
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.convertProductDtosToProducts(productDao
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.getProductsLikeNameForPageWithLimit(searchQuery, page, paginationLimit));
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}
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@Override
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public Product getProductById(Integer productId) {
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return productConverter.convertProductDtoToProduct(productDao.getProductById(productId));
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}
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}

‎online-store.core/src/main/java/com/itbulls/learnit/onlinestore/core/facades/impl/DefaultPurchaseFacade.java‎

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package com.itbulls.learnit.onlinestore.core.facades.impl;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.List;
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import com.itbulls.learnit.onlinestore.core.CoreConfigurations;
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import com.itbulls.learnit.onlinestore.core.facades.PurchaseFacade;
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import com.itbulls.learnit.onlinestore.core.facades.UserFacade;
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import com.itbulls.learnit.onlinestore.persistence.dao.PurchaseDao;
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import com.itbulls.learnit.onlinestore.persistence.dao.impl.MySqlJdbcPurchaseDao;
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import com.itbulls.learnit.onlinestore.persistence.dto.PurchaseDto;
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import com.itbulls.learnit.onlinestore.persistence.dto.converters.PurchaseDtoToPurchaseConverter;
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import com.itbulls.learnit.onlinestore.persistence.enteties.Product;
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import com.itbulls.learnit.onlinestore.persistence.enteties.Purchase;
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import com.itbulls.learnit.onlinestore.persistence.enteties.PurchaseStatus;
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import com.itbulls.learnit.onlinestore.persistence.enteties.User;
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import com.itbulls.learnit.onlinestore.persistence.enteties.impl.DefaultPurchase;
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import com.itbulls.learnit.onlinestore.persistence.enteties.impl.DefaultPurchaseStatus;
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public class DefaultPurchaseFacade implements PurchaseFacade {
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private static DefaultPurchaseFacade instance;
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private PurchaseDao purchaseDao = new MySqlJdbcPurchaseDao();
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private PurchaseDtoToPurchaseConverter purchaseConverter = new PurchaseDtoToPurchaseConverter();
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private UserFacade userFacade = DefaultUserFacade.getInstance();
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public static synchronized DefaultPurchaseFacade getInstance() {
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if (instance == null) {
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instance = new DefaultPurchaseFacade();
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}
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return instance;
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}
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@Override
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public void createPurchase(User user, Product product) {
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Purchase purchase = new DefaultPurchase();
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purchase.setCustomer(user);
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purchase.setProducts(new ArrayList<>(Arrays.asList(product)));
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var purchaseStatus = new DefaultPurchaseStatus();
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purchaseStatus.setId(1); // the initial, the first purchase status
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purchase.setPurchaseStatus(purchaseStatus);
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purchaseDao.savePurchase(purchaseConverter.convertPurchaseToPurchaseDto(purchase));
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}
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@Override
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public List<Purchase> getNotCompletedPurchases() {
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return purchaseConverter.convertPurchaseDtosToPurchases(purchaseDao.getNotCompletedPurchases(LAST_STATUS_OF_ORDER_FULFILMENT_ID));
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}
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@Override
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public void markFulfilmentStageForPurchaseIdAsCompleted(Integer purchaseId) {
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Purchase purchase = purchaseConverter.convertPurchaseDtoToPurchase(purchaseDao.getPurchaseById(purchaseId));
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PurchaseStatus purchaseStatus = purchase.getPurchaseStatus();
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int newPurchaseStatusId = purchaseStatus.getId() + 1;
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purchaseStatus.setId(newPurchaseStatusId);
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purchase.setPurchaseStatus(purchaseStatus);
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purchaseDao.updatePurchase(purchaseConverter.convertPurchaseToPurchaseDto(purchase));
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if (LAST_STATUS_OF_ORDER_FULFILMENT_ID.equals(newPurchaseStatusId)
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&& purchase.getCustomer().getReferrerUser() != null) {
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User referrerUser = purchase.getCustomer().getReferrerUser();
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double shareFromPurchase = purchase.getTotalPurchaseCost() * CoreConfigurations.REFFERER_REWARD_RATE;
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referrerUser.setMoney(referrerUser.getMoney() + shareFromPurchase);
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userFacade.updateUser(referrerUser);
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}
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}
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}

‎online-store.core/src/main/java/com/itbulls/learnit/onlinestore/core/facades/impl/DefaultUserFacade.java‎

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public User getUserById(Integer userId) {
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return userConverter.convertUserDtoToUser(userDao.getUserById(userId));
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}
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@Override
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public void updateUser(User referrerUser) {
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userDao.updateUser(userConverter.convertUserToUserDto(referrerUser));
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}
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@Override
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public List<User> getReferralsForUser(User loggedInUser) {
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return userConverter.convertUserDtosToUsers(userDao.getReferralsByUserId(loggedInUser.getId()));
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}
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}

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