From dc6baf28598bc0834df9c1e4e2a184f444d7b269 Mon Sep 17 00:00:00 2001 From: ZahraSadatMirvakili Date: Sun, 17 May 2026 23:10:39 +0330 Subject: [PATCH] HW-06-exceptions-and-file-handling --- src/main/java/Main.java | 24 +++-- src/main/java/ReportGenerator.java | 163 ++++++++++++++++++----------- 2 files changed, 116 insertions(+), 71 deletions(-) diff --git a/src/main/java/Main.java b/src/main/java/Main.java index 148a46e..8620676 100644 --- a/src/main/java/Main.java +++ b/src/main/java/Main.java @@ -14,16 +14,20 @@ 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. + try{ + while(scanner.hasNextLine()){ + String line = scanner.nextLine(); + String [] parts = line.split(",",3); + int productId = Integer.parseInt(parts[0]); + String name = parts[1]; + double price = Double.parseDouble(parts[2]); + Product product = new Product(productId , name , price); + productCatalog.add(product); + } + }finally { + scanner.close(); + input.close(); + } } public static void main(String[] args) diff --git a/src/main/java/ReportGenerator.java b/src/main/java/ReportGenerator.java index 8eb458b..c38bf33 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 { @@ -15,69 +20,105 @@ 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(){ + File file = new File(ordersFilePath); + + try (Scanner scanner = new Scanner(file)){ + while (scanner.hasNextLine()){ + String line = scanner.nextLine(); + if (line.trim().isEmpty()){ + continue; + } + String [] parts = line.split(",",3); + + if(parts.length !=3){ + totalInvalidLines++; + continue; + } + + int productId = 0; + int quantity = 0; + int discountPercent = 0; + boolean lineValid = true; + + try{ + productId = Integer.parseInt(parts[0].trim()); + }catch (NumberFormatException e){ + lineValid = false; + } + + try{ + quantity = Integer.parseInt(parts[1].trim()); + }catch (NumberFormatException e){ + lineValid = false; + } + + try{ + discountPercent = Integer.parseInt(parts[2].trim()); + }catch (NumberFormatException e){ + lineValid = false; + } + + if (lineValid){ + if (productId <= 0 || quantity <=0 || discountPercent <0 ||discountPercent >99){ + lineValid = false; + } + } + + Product matchingProduct = null; + + if(lineValid){ + for(Product product : productList){ + if(product.getProductID() == productId){ + matchingProduct = product; + break; + } + } + if(matchingProduct == null){ + lineValid = false; + } + } + if(lineValid){ + double subtotal = quantity * matchingProduct.getPrice(); + double discountValue = subtotal * discountPercent / 100.0; + double finalCost = subtotal - discountValue; + + totalQuantity += quantity; + totalFinalCost += finalCost; + totalDiscountValue += discountValue; + }else{ + totalInvalidLines ++; + } + } + } catch (FileNotFoundException e) { + System.out.println("Orders file not found: " + 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(){ + StringBuilder report = new StringBuilder(); - /* Example Structure - ========= SALES REPORT ========= - Total Quantity Sold: 42 - Total Final Cost: $1520.75 - Total Discount Value: $230.50 - Invalid Rows: 3 - ================================ - */ + report.append("========= SALES REPORT =========\n"); + report.append(String.format(java.util.Locale.US, "Total Quantity Sold: %d\n", totalQuantity)); + report.append(String.format(java.util.Locale.US, "Total Final Cost: $%.2f\n", totalFinalCost)); + report.append(String.format(java.util.Locale.US, "Total Discount Value: $%.2f\n", totalDiscountValue)); + report.append(String.format(java.util.Locale.US, "Invalid Rows: %d\n", totalInvalidLines)); + report.append("================================\n"); + + FileWriter writer = null; + try { + writer = new FileWriter("report.txt"); + writer.write(report.toString()); + } catch (IOException e) { + System.err.println("Error writing report file."); + } finally { + if (writer != null) { + try { + writer.close(); + } catch (IOException e) { + System.err.println("Error closing report file."); + } + } + } } } \ No newline at end of file -- 2.54.0