tasks/8/src/main/java/pl/weeia/DirConverter.java

package pl.weeia;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.stream.Stream;

public class DirConverter {
    public void convertFilesInDirectoryToUpperCase(String dirPath, String fileExtension) throws IOException {
        Path dir = Paths.get(dirPath);
        if (!Files.isDirectory(dir)) {
            throw new IllegalArgumentException("Podana ścieżka nie jest katalogiem: " + dirPath);
        }

        try (Stream<Path> files = Files.walk(dir)) {
            files.filter(Files::isRegularFile)
                 .filter(file -> file.toString().endsWith(fileExtension))
                 .forEach(file -> {
                     try {
                         new FileConverter().convertFileToUpperCase(file.toString());
                     } catch (IOException e) {
                         System.err.println("Błąd podczas konwersji pliku: " + file);
                     }
                 });
        }
    }
}