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feat: adds chukwumaibezim folder with CsvLoader class (#315)
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...o/io_app/src/main/java/com/codedifferently/lesson12/factory/chukwumaibezim/CsvLoader.java
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package com.codedifferently.lesson12.factory.chukwumaibezim; | ||
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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 com.opencsv.CSVReader; | ||
import com.opencsv.exceptions.CsvValidationException; | ||
import java.io.FileReader; | ||
import java.io.IOException; | ||
import java.time.Instant; | ||
import java.util.ArrayList; | ||
import java.util.HashMap; | ||
import java.util.List; | ||
import java.util.Map; | ||
import java.util.UUID; | ||
import org.springframework.core.io.ClassPathResource; | ||
import org.springframework.stereotype.Service; | ||
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@Service | ||
public class CsvLoader implements LibraryCsvDataLoader { | ||
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@Override | ||
public LibraryDataModel loadData() { | ||
LibraryDataModel libraryDataModel = new LibraryDataModel(); | ||
try { | ||
libraryDataModel.mediaItems = readMediaItemsFromCsv("csv/media_items.csv"); | ||
libraryDataModel.guests = readGuestsFromCsv("csv/guests.csv"); | ||
populateGuestsWithCheckouts("csv/checked_out_items.csv", libraryDataModel.guests); | ||
} catch (IOException e) { | ||
throw new RuntimeException("Failed to load data from CSV files", e); | ||
} catch (CsvValidationException ex) { | ||
} | ||
return libraryDataModel; | ||
} | ||
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private List<MediaItemModel> readMediaItemsFromCsv(String filePath) | ||
throws IOException, CsvValidationException { | ||
List<MediaItemModel> mediaItems = new ArrayList<>(); | ||
try (CSVReader reader = | ||
new CSVReader(new FileReader(new ClassPathResource(filePath).getFile()))) { | ||
reader.skip(1); // Skip header | ||
String[] line; | ||
while ((line = reader.readNext()) != null) { | ||
MediaItemModel mediaItem = new MediaItemModel(); | ||
mediaItem.type = line[0]; | ||
mediaItem.id = UUID.fromString(line[1]); | ||
mediaItem.title = line[2]; | ||
mediaItem.isbn = line[3]; | ||
mediaItem.authors = List.of(line[4].split("\\s*,\\s*")); | ||
mediaItem.pages = line[5].isEmpty() ? 0 : Integer.parseInt(line[5]); | ||
mediaItem.runtime = line[6].isEmpty() ? 0 : Integer.parseInt(line[6]); | ||
mediaItem.edition = line[7]; | ||
mediaItems.add(mediaItem); | ||
} | ||
} | ||
return mediaItems; | ||
} | ||
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private List<LibraryGuestModel> readGuestsFromCsv(String filePath) | ||
throws IOException, CsvValidationException { | ||
List<LibraryGuestModel> guests = new ArrayList<>(); | ||
try (CSVReader reader = | ||
new CSVReader(new FileReader(new ClassPathResource(filePath).getFile()))) { | ||
reader.skip(1); // Skip header | ||
String[] line; | ||
while ((line = reader.readNext()) != null) { | ||
LibraryGuestModel guest = new LibraryGuestModel(); | ||
guest.type = line[0]; | ||
guest.name = line[1]; | ||
guest.email = line[2]; | ||
guests.add(guest); | ||
} | ||
} | ||
return guests; | ||
} | ||
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private void populateGuestsWithCheckouts(String filePath, List<LibraryGuestModel> guests) | ||
throws IOException, CsvValidationException { | ||
Map<String, List<CheckoutModel>> checkoutsByGuestEmail = new HashMap<>(); | ||
try (CSVReader reader = | ||
new CSVReader(new FileReader(new ClassPathResource(filePath).getFile()))) { | ||
reader.skip(1); // Skip header | ||
String[] line; | ||
while ((line = reader.readNext()) != null) { | ||
String email = line[0]; | ||
CheckoutModel checkout = new CheckoutModel(); | ||
checkout.itemId = UUID.fromString(line[1]); | ||
checkout.dueDate = Instant.parse(line[2]); | ||
checkoutsByGuestEmail.computeIfAbsent(email, k -> new ArrayList<>()).add(checkout); | ||
} | ||
} | ||
// Assign checked-out items to respective guests | ||
for (LibraryGuestModel guest : guests) { | ||
List<CheckoutModel> checkouts = | ||
checkoutsByGuestEmail.getOrDefault(guest.email, new ArrayList<>()); | ||
guest.checkedOutItems = checkouts; | ||
} | ||
} | ||
} |