From 3763ddd3abc2c5cee7798345441993a797ec9fd2 Mon Sep 17 00:00:00 2001 From: ShayanEdalatjoo Date: Fri, 17 Jul 2026 00:15:47 +0330 Subject: [PATCH] compliting loadProducts() and processFile() functions. --- src/main/java/Main.java | 23 +++---- src/main/java/ReportGenerator.java | 101 ++++++++++++++++++----------- 2 files changed, 74 insertions(+), 50 deletions(-) diff --git a/src/main/java/Main.java b/src/main/java/Main.java index 148a46e..aaa2b9a 100644 --- a/src/main/java/Main.java +++ b/src/main/java/Main.java @@ -1,3 +1,5 @@ +import java.io.File; +import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.util.ArrayList; @@ -14,16 +16,15 @@ public class Main { 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 - - // NOTE - // - The data in products.csv is guaranteed to be valid. + while (scanner.hasNextLine()) { + String line = scanner.nextLine(); + String[] parts = line.split(","); + int productID = Integer.parseInt(parts[0].trim()); + String productName = parts[1].trim(); + double price = Double.parseDouble(parts[2].trim()); + Product product = new Product(productID, productName, price); + productCatalog.add(product); + } } public static void main(String[] args) @@ -43,4 +44,4 @@ 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..f5712ab 100644 --- a/src/main/java/ReportGenerator.java +++ b/src/main/java/ReportGenerator.java @@ -1,4 +1,8 @@ +import java.io.File; +import java.io.FileNotFoundException; +import java.io.IOException; import java.util.List; +import java.util.Scanner; public class ReportGenerator { @@ -8,7 +12,7 @@ public class ReportGenerator { private double totalFinalCost; private int totalQuantity; private double totalDiscountValue; - private int totalInvalidLines; + private int InvalidLines; public ReportGenerator(String ordersFilePath, List productList) { this.ordersFilePath = ordersFilePath; @@ -17,44 +21,63 @@ 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 + //opening and doing the math + try { + File source = new File(ordersFilePath); + Scanner scanner = new Scanner(source); + // + while (scanner.hasNextLine()) { + int productId; + int count; + int discountPercentage; + String line = scanner.nextLine(); + String[] parts = line.split(","); + try { + productId = Integer.parseInt(parts[0].trim()); + if (productId < 1 || productId > productList.size()) { + InvalidLines++; + continue; + } + + } catch (NumberFormatException e) { + InvalidLines++; + continue; + } + try { + count = Integer.parseInt(parts[1].trim()); + if(count < 1) { + InvalidLines++; + continue; + } + } catch (NumberFormatException e) { + InvalidLines++; + continue; + } + try { + discountPercentage = Integer.parseInt(parts[2].trim()); + if (discountPercentage < 0 || discountPercentage > 99) { + InvalidLines++; + continue; + } + } catch (NumberFormatException e) { + InvalidLines++; + continue; + } + + //computing the results + double cost = count * productList.get(productId - 1).getPrice(); + double discount = count * productList.get(productId - 1).getPrice() * discountPercentage / 100; + totalFinalCost += cost - discount; + totalDiscountValue += discount; + totalQuantity += count; + + } + scanner.close(); + } catch (FileNotFoundException e) { + System.out.println("File not found."); + } catch (IOException e) { + System.out.println(e.getMessage()); + } } public void saveReport()