From e458b6ae4b00209b52cc5f392409ebea7707eacc Mon Sep 17 00:00:00 2001 From: kasra Date: Thu, 18 Jun 2026 13:28:40 +0330 Subject: [PATCH] HW6 --- src/main/java/Main.java | 34 ++++--- src/main/java/ReportGenerator.java | 145 +++++++++++++++++------------ 2 files changed, 105 insertions(+), 74 deletions(-) diff --git a/src/main/java/Main.java b/src/main/java/Main.java index 148a46e..a07dd47 100644 --- a/src/main/java/Main.java +++ b/src/main/java/Main.java @@ -6,7 +6,8 @@ import java.util.Scanner; public class Main { static ArrayList productCatalog = new ArrayList<>(); - public static void loadProducts() throws IOException{ + + public static void loadProducts() throws IOException { InputStream input = Main.class .getClassLoader() .getResourceAsStream("products.csv"); @@ -15,23 +16,30 @@ public class Main { } Scanner scanner = new Scanner(input); - // TODO: - // - Read each line from products.csv - // - For each line, parse productId, name, and price - // - The format of the file is like this: - // [productId],[name],[price] - // - Store Product objects in the productCatalog ArrayList + while (scanner.hasNextLine()) { + String line = scanner.nextLine().trim(); + if (line.isEmpty()) { + continue; + } - // NOTE - // - The data in products.csv is guaranteed to be valid. + String[] parts = line.split(","); + if (parts.length == 3) { + int productId = Integer.parseInt(parts[0].trim()); + String name = parts[1].trim(); + double price = Double.parseDouble(parts[2].trim()); + + Product product = new Product(productId, name, price); + productCatalog.add(product); + } + } + scanner.close(); } - public static void main(String[] args) - { + public static void main(String[] args) { try { loadProducts(); } catch (IOException e) { - System.err.println("Error reading products"); + System.err.println("Error reading products: " + e.getMessage()); System.out.println("Terminating the program..."); return; } @@ -43,4 +51,4 @@ public class Main { reportGenerator.saveReport(); System.out.println("=== Report saved as report.txt"); } -} +} \ No newline at end of file diff --git a/src/main/java/ReportGenerator.java b/src/main/java/ReportGenerator.java index 8eb458b..4687d69 100644 --- a/src/main/java/ReportGenerator.java +++ b/src/main/java/ReportGenerator.java @@ -1,4 +1,9 @@ +import java.io.File; +import java.io.FileWriter; +import java.io.IOException; +import java.io.PrintWriter; import java.util.List; +import java.util.Scanner; public class ReportGenerator { @@ -15,69 +20,87 @@ public class ReportGenerator { this.productList = productList; } - public void processFile() - { - // TODO: - // 1. Open the order details CSV file - // 2. Read the file line by line - // 3. Split each line using comma delimiter - // (each line is guaranteed to contain exactly two commas) - // 4. Each line contains exactly 3 values in the format: - // [productId],[quantity],[discountPercent] - // 5. Attempt to convert values: - // - productId -> int - // - quantity -> int - // - discountPercent -> int - // NOTE: - // - quantity and discountPercent may contain invalid characters - // (e.g., letters instead of numbers). - // - If parsing any value fails (NumberFormatException), - // the entire line must be considered invalid. - // - Use try-catch blocks and exception handling to safely - // handle parsing and validation errors without stopping - // the processing of the remaining lines. - // 6. Validate parsed values: - // - productId must be greater than 0 - // - quantity must be greater than 0 - // - discountPercent must be between 0 and 99 inclusive - // 7. Look for a Product in productList that matches productId - // 8. If no Product with that ID exists in the catalog, - // the entire line is considered invalid - // 9. If all values are valid and the product exists, calculate: - // subtotal = quantity * product price - // discountValue = subtotal * discountPercent / 100 - // finalCost = subtotal - discountValue - // 10. Update report totals: - // - totalQuantity += quantity - // - totalFinalCost += finalCost - // - totalDiscountValue += discountValue - // 11. If any parsing error, validation failure, or missing product occurs: - // - increment totalInvalidLines - // - skip the line and continue processing the next line - // 12. Close all file resources + public void processFile() { + Scanner scanner = null; + try { + File file = new File(ordersFilePath); + scanner = new Scanner(file); + + while (scanner.hasNextLine()) { + String line = scanner.nextLine().trim(); + if (line.isEmpty()) { + continue; + } + + try { + String[] parts = line.split(","); + if (parts.length != 3) { + totalInvalidLines++; + continue; + } + + int productId = Integer.parseInt(parts[0].trim()); + int quantity = Integer.parseInt(parts[1].trim()); + int discountPercent = Integer.parseInt(parts[2].trim()); + + if (productId <= 0 || quantity <= 0 || discountPercent < 0 || discountPercent > 99) { + totalInvalidLines++; + continue; + } + + Product matchedProduct = null; + for (Product p : productList) { + if (p.getProductID() == productId) { + matchedProduct = p; + break; + } + } + + if (matchedProduct == null) { + totalInvalidLines++; + continue; + } + + double subtotal = quantity * matchedProduct.getPrice(); + double discountValue = (subtotal * discountPercent) / 100.0; + double finalCost = subtotal - discountValue; + + totalQuantity += quantity; + totalFinalCost += finalCost; + totalDiscountValue += discountValue; + + } catch (NumberFormatException e) { + totalInvalidLines++; + } + } + } catch (IOException e) { + System.err.println("Error reading orders file: " + e.getMessage()); + } finally { + if (scanner != null) { + scanner.close(); + } + } } - public void saveReport() - { - // TODO: - // 1. Build a formatted report string - // 2. Include: - // - total quantity - // - total final cost - // - total discount value - // - total invalid lines - // 3. Create/open output report file (name it report.txt) - // 4. Write report string into file - // 5. Handle file writing exceptions - // 6. Close writer resources + public void saveReport() { + PrintWriter writer = null; + try { + StringBuilder sb = new StringBuilder(); + sb.append("===== SALES REPORT =====\n\n"); + sb.append(String.format("Total Quantity: %d\n", totalQuantity)); + sb.append(String.format("Total Final Cost: %.2f\n", totalFinalCost)); + sb.append(String.format("Total Discount Value: %.2f\n", totalDiscountValue)); + sb.append(String.format("Invalid Lines: %d\n", totalInvalidLines)); - /* Example Structure - ========= SALES REPORT ========= - Total Quantity Sold: 42 - Total Final Cost: $1520.75 - Total Discount Value: $230.50 - Invalid Rows: 3 - ================================ - */ + writer = new PrintWriter(new FileWriter("report.txt")); + writer.print(sb.toString()); + + } catch (IOException e) { + System.err.println("Error writing report file: " + e.getMessage()); + } finally { + if (writer != null) { + writer.close(); + } + } } } \ No newline at end of file