ListFiles.java Source code

Introduction

Here is the source code for ListFiles.java

Source

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

class ListFiles extends SimpleFileVisitor<Path> {
    private final int indentionAmount = 3;
    private int indentionLevel;

    public ListFiles() {
        indentionLevel = 0;
    }

    private void indent() {
        for (int i = 0; i < indentionLevel; i++) {
            System.out.print(' ');
        }
    }

    @Override
    public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) {
        indent();
        System.out.println("Visiting file:" + file.getFileName());
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult postVisitDirectory(Path directory, IOException e) throws IOException {
        indentionLevel -= indentionAmount;
        indent();
        System.out.println("Finished with the directory: " + directory.getFileName());
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult preVisitDirectory(Path directory, BasicFileAttributes attributes) throws IOException {
        indent();
        System.out.println("About to traverse the directory: " + directory.getFileName());
        indentionLevel += indentionAmount;
        return FileVisitResult.CONTINUE;
    }

    @Override
    public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
        System.out.println("A file traversal error ocurred");
        return super.visitFileFailed(file, exc);
    }
}

public class Test {

    public static void main(String[] args) {
        try {
            Path path = Paths.get("/home");
            ListFiles listFiles = new ListFiles();
            Files.walkFileTree(path, listFiles);
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }
}