Split the string using file Path separator

In my previous post, I explained how to split a file path using file separator. Sometimes, you may want to split the string using file path separator.

What is path separator?

Path separator is used to combine list of paths. For example, In linux based systems ‘:’ is used as path separator, on Windows ‘;’ is used as path separator.

On Linux environment, paths can be combined using ‘:’ like below.

/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/Library/Java/JavaVirtualMachines/jdk1.8.0_77.jdk/Contents/Home/bin:

On Windows based systems, paths can be combined using ‘;’ like below.

C:\ProgramData\Oracle\Java\javapath;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SYSTEMROOT%\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Java\jdk1.8.0_102\bin;

Following program splits the file paths into list of file paths based on the file path separator.

For the following input

f1\f2\f3;folder1\folder2;users\Krishna

On Windows system, following application return output array like below.

{"f1\f2\f3", "folder1\folder2, "users\Krishna"}

FileUtil.java

package com.sample.util;

import java.io.File;

public class FileUtil {

 private static final String[] NO_PATHS = {};

 public static String[] filePaths(String str) {
  if (str == null || str.isEmpty()) {
   return NO_PATHS;
  }

  return str.split(File.pathSeparator);
 }

}

FileUtilTest.java

package com.sample.util;

import static org.junit.Assert.assertEquals;

import java.io.File;

import org.junit.Test;

public class FileUtilTest {

 @Test
 public void filePaths_empty_emptyArray() {
  String[] result = FileUtil.filePaths("");

  assertEquals(result.length, 0);
 }

 @Test
 public void filePaths_empty_nullArray() {
  String[] result = FileUtil.filePaths(null);

  assertEquals(result.length, 0);
 }

 @Test
 public void filePaths_filePaths_arrayWithfilePaths() {
  String fileName = "hello.txt";

  String[] result = FileUtil.filePaths(fileName);

  assertEquals(result[0], fileName);
 }

 @Test
 public void fileNames_filePaths_arrayWithFilePaths() {
  String path1 = "f1" + File.separator + "f2" + File.separator + "f3";
  String path2 = "folder1" + File.separator + "folder2";
  String path3 = "users" + File.separator + "Krishna";

  String paths = new StringBuilder(path1).append(File.pathSeparator).append(path2).append(File.pathSeparator)
    .append(path3).toString();

  String[] result = FileUtil.filePaths(paths);

  assertEquals(result[0], path1);
  assertEquals(result[1], path2);
  assertEquals(result[2], path3);
 }

}

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