Check given path is a directory and not a symbolic link in Java

Below snippet return true, if the  folderPath is a regular file and not a symbolic link.

Files.isDirectory(folderPath, LinkOption.NOFOLLOW_LINKS);

 

Let’s experiment it with below example.

$ls -lart
total 0
drwxrwxrwt  17 root     wheel  544 Jan  8 17:53 ..
drwxr-xr-x   2 krishna  wheel   64 Jan  8 20:05 demo
lrwxr-xr-x   1 krishna  wheel    4 Jan  8 20:05 demo_sym_link -> demo
drwxr-xr-x   4 krishna  wheel  128 Jan  8 20:05 .

 As you see the above snippet,

a.   Folder ‘demo’ is a regular directory

b.   Folder demo_sym_link is a symbolic link pointing to the directory demo

 

Find the below working application.

RegularFolderCheck.java

package com.sample.app.files;

import java.io.File;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.util.Objects;

public class RegularFolderCheck {

	public static boolean isFolder(final String folderPath) {
		Objects.requireNonNull(folderPath);
		return isFolder(new File(folderPath));
	}

	public static boolean isFolder(final File folder) {
		Objects.requireNonNull(folder);
		return isFolder(folder.toPath());
	}

	public static boolean isFolder(final Path folderPath) {
		Objects.requireNonNull(folderPath);
		return Files.isDirectory(folderPath, LinkOption.NOFOLLOW_LINKS);
	}

	public static void main(String[] args) {
		final String folder1 = "/Users/Shared/filePrograms/demo";
		final String folder2 = "/Users/Shared/filePrograms/demo_sym_link";

		System.out.println("Is '" + folder1 + "' regular folder ? " + isFolder(folder1));
		System.out.println("Is '" + folder2 + "' regular folder ? " + isFolder(folder2));
	}
}

 

Output

Is '/Users/Shared/filePrograms/demo' regular folder ? true
Is '/Users/Shared/filePrograms/demo_sym_link' regular folder ? false

 

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