HW-06 is complete
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Main.java
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@@ -13,17 +13,22 @@ public class Main {
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if (input == null) {
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throw new IOException("products.csv not found");
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}
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Scanner scanner = new Scanner(input);
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// TODO:
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// - Read each line from products.csv
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// - For each line, parse productId, name, and price
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// - The format of the file is like this:
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// [productId],[name],[price]
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// - Store Product objects in the productCatalog ArrayList
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try(Scanner scanner = new Scanner(input)) {
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while (scanner.hasNextLine()) {
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String line = scanner.nextLine().trim();
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if (line.isEmpty()) continue;
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String[] parts = line.split(",");
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if (parts.length == 3) {
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int productId = Integer.parseInt(parts[0].trim());
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String name = parts[1].trim();
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double price = Double.parseDouble(parts[2].trim());
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// NOTE
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// - The data in products.csv is guaranteed to be valid.
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productCatalog.add(new Product(productId, name, price));
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}
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}
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}
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}
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public static void main(String[] args)
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@@ -1,4 +1,9 @@
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import java.io.InputStream;
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import java.io.FileWriter;
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import java.io.PrintWriter;
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import java.io.IOException;
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import java.util.List;
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import java.util.Scanner;
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public class ReportGenerator {
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@@ -15,69 +20,93 @@ public class ReportGenerator {
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this.productList = productList;
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}
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public void processFile()
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{
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// TODO:
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public void processFile() {
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// 1. Open the order details CSV file
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// 2. Read the file line by line
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// 3. Split each line using comma delimiter
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// (each line is guaranteed to contain exactly two commas)
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// 4. Each line contains exactly 3 values in the format:
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// [productId],[quantity],[discountPercent]
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// 5. Attempt to convert values:
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// - productId -> int
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// - quantity -> int
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// - discountPercent -> int
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// NOTE:
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// - quantity and discountPercent may contain invalid characters
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// (e.g., letters instead of numbers).
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// - If parsing any value fails (NumberFormatException),
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// the entire line must be considered invalid.
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// - Use try-catch blocks and exception handling to safely
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// handle parsing and validation errors without stopping
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// the processing of the remaining lines.
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// 6. Validate parsed values:
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// - productId must be greater than 0
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// - quantity must be greater than 0
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// - discountPercent must be between 0 and 99 inclusive
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InputStream input = Main.class.getClassLoader().getResourceAsStream(ordersFilePath);
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if (input == null) {
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System.err.println("Order details file not found: " + ordersFilePath);
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return;
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}
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// 2. Read the file line by line using try-with-resources (Automatic closing)
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try (Scanner scanner = new Scanner(input)) {
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while (scanner.hasNextLine()) {
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String line = scanner.nextLine().trim();
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if (line.isEmpty()) continue;
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// Inner try-catch protects the outer loop from breaking if one row fails
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try {
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// 3. & 4. Split each line using comma delimiter
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String[] parts = line.split(",");
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if (parts.length != 3) {
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throw new IllegalArgumentException("Line does not contain exactly 3 values");
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}
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// 5. Attempt to convert values
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// (Catching IllegalArgumentException below will naturally catch NumberFormatException here)
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int productId = Integer.parseInt(parts[0].trim());
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int quantity = Integer.parseInt(parts[1].trim());
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int discountPercent = Integer.parseInt(parts[2].trim());
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// 6. Validate parsed values
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if (productId <= 0) {
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throw new IllegalArgumentException("Product ID must be greater than 0");
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}
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if (quantity <= 0) {
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throw new IllegalArgumentException("Quantity must be greater than 0");
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}
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if (discountPercent < 0 || discountPercent > 99) {
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throw new IllegalArgumentException("Discount percent must be between 0 and 99 inclusive");
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}
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// 7. Look for a Product in productList that matches productId
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// 8. If no Product with that ID exists in the catalog,
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// the entire line is considered invalid
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// 9. If all values are valid and the product exists, calculate:
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// subtotal = quantity * product price
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// discountValue = subtotal * discountPercent / 100
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// finalCost = subtotal - discountValue
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// 10. Update report totals:
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// - totalQuantity += quantity
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// - totalFinalCost += finalCost
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// - totalDiscountValue += discountValue
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// 11. If any parsing error, validation failure, or missing product occurs:
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// - increment totalInvalidLines
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// - skip the line and continue processing the next line
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// 12. Close all file resources
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Product matchingProduct = null;
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for (Product p : productList) {
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if (p.getProductID() == productId) {
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matchingProduct = p;
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break;
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}
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}
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public void saveReport()
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{
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// TODO:
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// 1. Build a formatted report string
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// 2. Include:
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// - total quantity
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// - total final cost
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// - total discount value
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// - total invalid lines
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// 3. Create/open output report file (name it report.txt)
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// 4. Write report string into file
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// 8. If no Product with that ID exists, consider it invalid
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if (matchingProduct == null) {
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throw new IllegalArgumentException("Product ID does not exist in catalog");
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}
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// 9. Calculations
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double subtotal = quantity * matchingProduct.getPrice();
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double discountValue = (subtotal * discountPercent) / 100.0;
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double finalCost = subtotal - discountValue;
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// 10. Update report totals
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this.totalQuantity += quantity;
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this.totalFinalCost += finalCost;
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this.totalDiscountValue += discountValue;
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} catch (IllegalArgumentException e) {
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// 11. Handles both NumberFormatException and custom validation failures smoothly
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this.totalInvalidLines++;
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// Continues automatically to the next line in the while loop
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}
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}
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} // 12. Scanner resource is safely closed here
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}
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public void saveReport() {
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// 3. Create/open output report file (name it report.txt) using try-with-resources
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try (PrintWriter writer = new PrintWriter(new FileWriter("report.txt"))) {
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// 1. & 2. Build and write the formatted report string
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writer.println("===== SALES REPORT =====");
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writer.println();
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writer.printf("Total Quantity: %d%n", totalQuantity);
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writer.printf("Total Final Cost: %.2f%n", totalFinalCost);
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writer.printf("Total Discount Value: %.2f%n", totalDiscountValue);
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writer.printf("Invalid Lines: %d%n", totalInvalidLines);
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} catch (IOException e) {
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// 5. Handle file writing exceptions
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// 6. Close writer resources
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/* Example Structure
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========= SALES REPORT =========
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Total Quantity Sold: 42
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Total Final Cost: $1520.75
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Total Discount Value: $230.50
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Invalid Rows: 3
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================================
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*/
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System.err.println("Error generating report file: " + e.getMessage());
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} // 6. PrintWriter resource safely closed here
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}
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}
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