// files/Directories.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.util.*;

import java.nio.file.*;

import onjava.RmDir;

public class Directories {

static Path test = Paths.get("test");

static String sep =

FileSystems.getDefault().getSeparator();

static List<String> parts =

Arrays.asList("foo", "bar", "baz", "bag");

static Path makeVariant() {

Collections.rotate(parts, 1);

return Paths.get("test", String.join(sep, parts));

}

static void refreshTestDir() throws Exception {

if(Files.exists(test))

RmDir.rmdir(test);

if(!Files.exists(test))

Files.createDirectory(test);

}

public static void

main(String[] args) throws Exception {

refreshTestDir();

Files.createFile(test.resolve("Hello.txt"));

Path variant = makeVariant();

// Throws exception (too many levels):

try {

Files.createDirectory(variant);

} catch(Exception e) {

System.out.println("Nope, that doesn't work.");

}

populateTestDir();

Path tempdir =

Files.createTempDirectory(test, "DIR_");

Files.createTempFile(tempdir, "pre", ".non");

Files.newDirectoryStream(test)

.forEach(System.out::println);

System.out.println("*********");

Files.walk(test).forEach(System.out::println);

}

static void populateTestDir() throws Exception {

for(int i = 0; i < parts.size(); i++) {

Path variant = makeVariant();

if(!Files.exists(variant)) {

Files.createDirectories(variant);

Files.copy(Paths.get("Directories.java"),

variant.resolve("File.txt"));

Files.createTempFile(variant, null, null);

}

}

}

}

/* Output:

Nope, that doesn't work.

test\bag

test\bar

test\baz

test\DIR_8683707748599240459

test\foo

test\Hello.txt

*********

test

test\bag

test\bag\foo

test\bag\foo\bar

test\bag\foo\bar\baz

test\bag\foo\bar\baz\4316127347949967230.tmp

test\bag\foo\bar\baz\File.txt

test\bar

test\bar\baz

test\bar\baz\bag

test\bar\baz\bag\foo

test\bar\baz\bag\foo\1223263495976065729.tmp

test\bar\baz\bag\foo\File.txt

test\baz

test\baz\bag

test\baz\bag\foo

test\baz\bag\foo\bar

test\baz\bag\foo\bar\6666183168609095028.tmp

test\baz\bag\foo\bar\File.txt

test\DIR_8683707748599240459

test\DIR_8683707748599240459\pre6366626804787365549.non

test\foo

test\foo\bar

test\foo\bar\baz

test\foo\bar\baz\bag

test\foo\bar\baz\bag\4712324129011589115.tmp

test\foo\bar\baz\bag\File.txt

test\Hello.txt

*/