betanzos / miscellaneous

Many utilities in one place

Overview

This project wrap many useful utilities.

1. Comparators

Grouped in com.betanzos.comparators.

1.1. AlphanumericStringComparator

Compare the String representation of two Objects. If this String representations result in an alphanumeric String this class allows to treat the sequential numeric parts present in the strings as numbers, which will compares as such. With this in mind, fallowing strings will be equals:

• "My serial 2x01.mp4",
  
• "My serial 2x1.mp4" and
  
• "My serial 2x00000001.mp4"

This behaivor is very useful to sort by name files and folders within a directory.

Example: Sort directory content.

List dir contect as loaded:

var dir = new File("/home/user/Desktop/test");

var dirContent = dir.listFiles();
Arrays.asList(dirContent)
        .stream()
        .map(File::getName)
        .forEach(System.out::println);

output:

10 - Lesson 10.mp4
2 - Lesson 2.mp4
20 - Lesson 20.mp4
1 - Lesson 1.mp4

Sorting by file/folder name (because all of there share the parent path):

Arrays.sort(dirContent, new AlphanumericStringComparator());
Arrays.asList(dirContent)
        .stream()
        .map(File::getName)
        .forEach(System.out::println);

output:

1 - Lesson 1.mp4
2 - Lesson 2.mp4
10 - Lesson 10.mp4
20 - Lesson 20.mp4