From f23bc983039c694208640778d4dab2e513f23db7 Mon Sep 17 00:00:00 2001 From: Parmis Jamami Date: Fri, 22 May 2026 20:42:50 +0330 Subject: [PATCH 1/2] implement ReportGenerator --- src/main/java/ReportGenerator.java | 139 +++++++++++++++++------------ 1 file changed, 80 insertions(+), 59 deletions(-) diff --git a/src/main/java/ReportGenerator.java b/src/main/java/ReportGenerator.java index 8eb458b..f53d6dc 100644 --- a/src/main/java/ReportGenerator.java +++ b/src/main/java/ReportGenerator.java @@ -1,4 +1,9 @@ +import java.io.File; +import java.io.FileNotFoundException; +import java.io.FileWriter; +import java.io.IOException; import java.util.List; +import java.util.Scanner; public class ReportGenerator { @@ -17,67 +22,83 @@ public class ReportGenerator { 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 + File file = new File(ordersFilePath); + if(!file.exists()) + { + System.err.println("File is not found!"); + return; + } + try(Scanner scanner = new Scanner(file)) + { + while (scanner.hasNextLine()) + { + String line = scanner.nextLine(); + if(line.isBlank()) continue; + try + { + String[] parts = line.split(","); + int productId = Integer.parseInt(parts[0].trim()); + int quantity = Integer.parseInt(parts[1].trim()); + int discountPercent = Integer.parseInt(parts[2].trim()); + + if( quantity<=0 || discountPercent < 0 || discountPercent >99) + { + throw new Exception("invalid value!"); + } + + Product product = null; + for (Product p : productList) + { + if(p.getProductID() == productId) + { + product = p; + break; + } + } + if(product == null) + { + throw new Exception("Product not found"); + } + + double subtotal = quantity * product.getPrice(); + double discountValue = subtotal * discountPercent / 100; + double finalCost = subtotal - discountValue; + + totalQuantity += quantity; + totalFinalCost += finalCost; + totalDiscountValue += discountValue; + + + } + catch (Exception e) + { + totalInvalidLines++; + } + } + } + catch (FileNotFoundException e) + { + System.out.println(e.getMessage()); + } } - 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() throws IOException { + String report = "========= SALES REPORT =========\n" + + "Total Quantity: " + totalQuantity + "\n" + + "Total Final Cost: " + totalFinalCost + "\n" + + "Total Discount Value: " + totalDiscountValue + "\n" + + "Invalid Lines: " + totalInvalidLines + "\n" + + "================================"; - /* Example Structure - ========= SALES REPORT ========= - Total Quantity Sold: 42 - Total Final Cost: $1520.75 - Total Discount Value: $230.50 - Invalid Rows: 3 - ================================ - */ + try + { + FileWriter writer = new FileWriter("report.txt"); + writer.write(report); + writer.close(); + } + catch (IOException e) + { + System.err.println("ERROR!"); + } } } \ No newline at end of file -- 2.54.0 From 70ad28933868f2800107c68f9b9ad566837fa6da Mon Sep 17 00:00:00 2001 From: Parmis Jamami Date: Fri, 22 May 2026 20:43:21 +0330 Subject: [PATCH 2/2] add main --- src/main/java/Main.java | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/src/main/java/Main.java b/src/main/java/Main.java index 148a46e..1c3c62e 100644 --- a/src/main/java/Main.java +++ b/src/main/java/Main.java @@ -13,21 +13,23 @@ public class Main { if (input == null) { throw new IOException("products.csv not found"); } - 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 + try (Scanner scanner = new Scanner(input)) { + while (scanner.hasNextLine()) { + String line = scanner.nextLine(); + if (line.isBlank()) continue; - // NOTE - // - The data in products.csv is guaranteed to be valid. + String[] parts = line.split(","); + int id = Integer.parseInt(parts[0].trim()); + String name = parts[1].trim(); + double price = Double.parseDouble(parts[2].trim()); + + productCatalog.add(new Product(id, name, price)); + } + } } - public static void main(String[] args) - { + public static void main(String[] args) throws IOException { try { loadProducts(); } catch (IOException e) { -- 2.54.0