package ru.javawebinar.basejava;

import java.io.File;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.Collection;

import java.util.HashSet;

import java.util.Objects;

import java.util.Set;

public class MainFile {

public static void main(String[] args) {

File rootDir = new File(".");

printDirectoryDeeply(rootDir, "");

}

public static void printDirectoryDeeply(File dir, String indent) {

File[] files = dir.listFiles();

if (files != null) {

for (File file : files) {

if (file.isFile()) {

System.out.println(indent + file.getName());

} else if (file.isDirectory()) {

System.out.println(indent + "- " + file.getName());

printDirectoryDeeply(file, " " + indent);

}

}

}

}

public static Collection<File> getFiles(File rootDir) {

Set<File> fileSet = new HashSet<>();

if (rootDir == null || rootDir.listFiles() == null) {

return fileSet;

}

for (File entry : Objects.requireNonNull(rootDir.listFiles())) {

if (entry.isFile()) {

fileSet.add(entry);

} else {

fileSet.addAll(getFiles(entry));

}

}

return fileSet;

}

private static void filesWalk(String rootDir) throws IOException {

Files.walk(Paths.get("."))

.filter(Files::isRegularFile)

.map(Path::getFileName)

.forEach(System.out::println);

}

private static void filesFind(String rootDir) throws IOException {

Files.find(Paths.get("."), Integer.MAX_VALUE, (filePath, fileAttr) -> fileAttr.isRegularFile())

.map(Path::getFileName)

.forEach(System.out::println);

}

}