feat: csv data loader

lesson_12/io/io_app/src/main/java/com/codedifferently/lesson12/factory/randycastro/CsvDataLoader.java

@@ -0,0 +1,104 @@
+package com.codedifferently.lesson12.factory.randycastro;
+
+import com.codedifferently.lesson12.factory.LibraryCsvDataLoader;
+import com.codedifferently.lesson12.models.CheckoutModel;
+import com.codedifferently.lesson12.models.LibraryDataModel;
+import com.codedifferently.lesson12.models.LibraryGuestModel;
+import com.codedifferently.lesson12.models.MediaItemModel;
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.stereotype.Service;
+
+// create a path for each file
+@Service
+public class CsvDataLoader implements LibraryCsvDataLoader {
+ public static void main(String[] args) throws IOException {
+ new CsvDataLoader().loadData();
+ }
+
+ @Override
+ public LibraryDataModel loadData() throws IOException {
+ {
+ var model = new LibraryDataModel();
+ model.mediaItems = new ArrayList<>(); // You load this from the file
+ model.guests = new ArrayList<>(); // You also load this from the file.
+
+ List<MediaItemModel> mediaItems =
+ readMediaItems("lesson_12/io/io_app/src/main/resources/csv/media_items.csv");
+ List<LibraryGuestModel> guests = readGuests("path/to/guests.csv");
+ Map<String, List<CheckoutModel>> checkoutsByGuestEmail =
+ getCheckedOutItems("path/to/checked_out_items.csv");
+
+ for (var guest : guests) {
+ var checkouts = checkoutsByGuestEmail.get(guest.email);
+ if (checkouts != null) {
+ guest.checkedOutItems = checkouts;
+ }
+ }
+
+ return model;
+ }
+ }
+
+ public static List<MediaItemModel> readMediaItems(String Path) {
+ try (BufferedReader reader =
+ new BufferedReader(new FileReader(new ClassPathResource(path).getFile()))) {
+ List<MediaItemModel> items = new ArrayList<>();
+ String line;
+ while ((line = reader.readLine()) != null) {
+ var parts = line.split(",");
+ var item = new MediaItemModel();
+
+ item.type = parts[0];
+ item.id = UUID.fromString(parts[1]);
+ item.title = parts[2];
+ item.isbn = parts[3];
+ item.authors = List.of(parts[4]);
+
+ if (parts[5].equals("")) {
+ item.pages = 0;
+ } else {
+ item.pages = Integer.parseInt(parts[5]);
+ }
+
+ if (parts[6].equals("")) {
+ item.runtime = 0;
+ } else {
+ item.runtime = Integer.parseInt(parts[6]);
+ }
+ item.edition = parts[7];
+
+ items.add(item);
+ }
+ return items;
+ } catch (IOException e) {
+ throw new RuntimeException("Failed to read media items", e);
+ }
+ }
+}
+
+ /*List<MediaItemModel> readMediaItems(String filePath) {
+ List<MediaItemModel> items = new ArrayList<>();
+ try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
+ String line;
+ while ((line = reader.readLine()) != null) {
+ String[] parts = line.split(",");
+ MediaItemModel item = new MediaItemModel();
+ item.setType(parts[0]);
+ item.setId(parts[1]);
+ item.setAuthor(parts[2]);
+ item.setTitle(parts[3]); // Assuming 'title' instead of 'type' again
+ items.add(item);
+ }
+ } catch (IOException e) {
+ e.printStackTrace();
+ // Handle the exception appropriately
+ }
+ return items;
+ }
+ }*/