From 3e026baf9c36ba8fe6aa276f584c87ae4bee0f24 Mon Sep 17 00:00:00 2001 From: Farnam Jahangard Date: Wed, 20 May 2026 23:28:01 +0330 Subject: [PATCH] + Implemented processFile and saveReport in ReportGenerator + Implemented loadProducts in main --- src/main/java/Main.java | 23 +++-- src/main/java/ReportGenerator.java | 160 ++++++++++++++++++----------- 2 files changed, 115 insertions(+), 68 deletions(-) diff --git a/src/main/java/Main.java b/src/main/java/Main.java index 148a46e..a6515b2 100644 --- a/src/main/java/Main.java +++ b/src/main/java/Main.java @@ -15,15 +15,20 @@ 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(); + String[] values = line.split(","); - // NOTE - // - The data in products.csv is guaranteed to be valid. + int productId = Integer.parseInt(values[0]); + String productName = values[1]; + double productPrice = Double.parseDouble(values[2]); + + Product product = new Product(productId,productName,productPrice); + + productCatalog.add(product); + } + + scanner.close(); } public static void main(String[] args) @@ -43,4 +48,4 @@ 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..0a1b2ed 100644 --- a/src/main/java/ReportGenerator.java +++ b/src/main/java/ReportGenerator.java @@ -1,4 +1,11 @@ +import java.io.FileWriter; +import java.io.IOException; +import java.io.InputStream; +import java.nio.file.Path; +import java.nio.file.Paths; +import java.text.ParseException; import java.util.List; +import java.util.Scanner; public class ReportGenerator { @@ -8,7 +15,7 @@ public class ReportGenerator { private double totalFinalCost; private int totalQuantity; private double totalDiscountValue; - private int totalInvalidLines; + private int totalInvalidLines = 0; public ReportGenerator(String ordersFilePath, List productList) { this.ordersFilePath = ordersFilePath; @@ -17,67 +24,102 @@ 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 + Path path = Paths.get(ordersFilePath); + try { + Scanner scanner = new Scanner(path); + while(scanner.hasNextLine()){ + String line = scanner.nextLine(); + + String[] values = line.split(","); + int productId; + int quantity; + int discount; + + // Product id + + try{ + productId = Integer.parseInt(values[0]); + if (productId <= 0 ){ + System.err.println("Error, invalid product id : " + productId); + totalInvalidLines++; + continue; + } + } + catch (NumberFormatException e){ + System.err.println("Error, invalid format for product id : " + values[0]); + totalInvalidLines++; + continue; + } + + // Quantity + + try{ + quantity = Integer.parseInt(values[1]); + if (quantity <= 0){ + System.err.println("Error, invalid quantity amount : " + quantity); + totalInvalidLines++; + continue; + } + } + catch (NumberFormatException e){ + System.err.println("Error, invalid format for quantity : " + values[1]); + totalInvalidLines++; + continue; + } + + // Discount + + try { + discount = Integer.parseInt(values[2]); + if (discount < 0 || discount > 99){ + System.err.println("Error, invalid discount amount : " + discount); + totalInvalidLines++; + continue; + } + } + catch (NumberFormatException e){ + System.err.println("Error, invalid format for discount : " + values[2]); + totalInvalidLines++; + continue; + } + + try { + Product product = productList.get(productId - 1); + + double subTotal = quantity * product.getPrice(); + double discountValue = subTotal * discount / 100; + double finalCost = subTotal - discountValue; + + totalQuantity += quantity; + totalFinalCost += finalCost; + totalDiscountValue += discountValue; + } + catch (IndexOutOfBoundsException e){ + System.err.println("Error, no such product exists with this id : " + productId); + totalInvalidLines++; + continue; + } + } + scanner.close(); + } catch (IOException e) { + System.out.println("Unable to read order details."); + } } 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 - - /* Example Structure - ========= SALES REPORT ========= - Total Quantity Sold: 42 - Total Final Cost: $1520.75 - Total Discount Value: $230.50 - Invalid Rows: 3 - ================================ - */ + try{ + FileWriter fileWriter = new FileWriter("report.txt"); + fileWriter.write(" ========= SALES REPORT =========\n"); + fileWriter.write("Total Quantity Sold: " + totalQuantity + "\n"); + fileWriter.write("Total Final Cost : $" + totalFinalCost + "\n"); + fileWriter.write("Total Discount Value : $" + totalDiscountValue + "\n"); + fileWriter.write("Invalid Rows : " + totalInvalidLines + "\n"); + fileWriter.write("================================"); + fileWriter.close(); + } + catch (IOException e) { + System.err.println(e.getMessage()); + } } } \ No newline at end of file