Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Lesson 12 feat: Corrected line split (#313)
* feat: Created methods for guest model and checkout model * fix: Fixed package * fix:added reader.readline to each method * feat: corrected line.split * feat:added items * feat:Implemented Csv Readers * fix: Fixed mmethods
- Loading branch information
Showing
1 changed file
with
118 additions
and
0 deletions.
There are no files selected for viewing
118 changes: 118 additions & 0 deletions
118
.../io_app/src/main/java/com/codedifferently/lesson12/factory/natayaprice/CsvDataLoader.java
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,118 @@ | ||
package com.codedifferently.lesson12.factory.natayaprice; | ||
|
||
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; | ||
|
||
@Service | ||
public class CsvDataLoader implements LibraryCsvDataLoader { | ||
|
||
@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 | CsvValidationException e) { | ||
throw new RuntimeException("Failed to load data from CSV files", e); | ||
} | ||
return libraryDataModel; | ||
} | ||
|
||
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()))) { | ||
String[] header = reader.readNext(); // Skip header | ||
String[] line; | ||
while ((line = reader.readNext()) != null) { | ||
MediaItemModel mediaItem = parseMediaItem(line); | ||
mediaItems.add(mediaItem); | ||
} | ||
} | ||
return mediaItems; | ||
} | ||
|
||
private MediaItemModel parseMediaItem(String[] line) { | ||
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 = parseInteger(line[5]); | ||
mediaItem.runtime = parseInteger(line[6]); | ||
mediaItem.edition = line[7]; | ||
return mediaItem; | ||
} | ||
|
||
private int parseInteger(String value) { | ||
try { | ||
return Integer.parseInt(value); | ||
} catch (NumberFormatException e) { | ||
return 0; | ||
} | ||
} | ||
|
||
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()))) { | ||
String[] header = reader.readNext(); // 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; | ||
} | ||
|
||
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()))) { | ||
String[] header = reader.readNext(); // Skip header | ||
String[] line; | ||
while ((line = reader.readNext()) != null) { | ||
String email = line[0]; | ||
CheckoutModel checkout = parseCheckout(line); | ||
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; | ||
} | ||
} | ||
|
||
private CheckoutModel parseCheckout(String[] line) { | ||
CheckoutModel checkout = new CheckoutModel(); | ||
checkout.itemId = UUID.fromString(line[1]); | ||
checkout.dueDate = Instant.parse(line[2]); | ||
return checkout; | ||
} | ||
} |