DeleteFileVisitor.java

package modern.challenge;

import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.FileVisitor;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.attribute.BasicFileAttributes;

public class DeleteFileVisitor implements FileVisitor {

    @Override
    public FileVisitResult postVisitDirectory(Object dir, IOException ioe) throws IOException {
       
        System.out.println("Visited: " + (Path) dir);

        boolean deleted = delete((Path) dir);

        if (deleted) {
            System.out.println("Deleted: " + (Path) dir);
        } else {
            System.out.println("Not deleted: " + (Path) dir);
        }

        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult preVisitDirectory(Object dir, BasicFileAttributes attrs) throws IOException {
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFile(Object file, BasicFileAttributes attrs) throws IOException {
        
        boolean deleted = delete((Path) file);

        if (deleted) {
            System.out.println("Deleted: " + (Path) file);
        } else {
            System.out.println("Not deleted: " + (Path) file);
        }

        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFileFailed(Object file, IOException ioe) throws IOException {
        return FileVisitResult.CONTINUE;
    }

    private static boolean delete(Path file) throws IOException {
        return Files.deleteIfExists(file);
    }
}