Files and Paths

Path Normalize

Normalizing a path removes redundant pieces such as parent-directory markers.

raw path A raw path can contain navigation pieces such as `..` before it is simplified.
normalized path A normalized path has those redundant navigation pieces collapsed when possible.

Path Normalize

draft
PathNormalize.java
Replay: real traced execution (multi-file project)
import java.nio.file.Path;

public class PathNormalize {
    public static void main(String[] args) {
        int draft = 1;
        Path raw = Path.of("notes", "drafts", "..", "day" + draft + ".txt");
        Path clean = raw.normalize();

        System.out.println("raw=" + raw);
        System.out.println("clean=" + clean);
    }
}

import java.nio.file.Path;

public class PathNormalize {
    public static void main(String[] args) {
        int draft = 2;
        Path raw = Path.of("notes", "drafts", "..", "day" + draft + ".txt");
        Path clean = raw.normalize();

        System.out.println("raw=" + raw);
        System.out.println("clean=" + clean);
    }
}

import java.nio.file.Path;

public class PathNormalize {
    public static void main(String[] args) {
        int draft = 3;
        Path raw = Path.of("notes", "drafts", "..", "day" + draft + ".txt");
        Path clean = raw.normalize();

        System.out.println("raw=" + raw);
        System.out.println("clean=" + clean);
    }
}

  1. draft ← 1, raw ← notes/drafts/../day1.txt, clean ← notes/day1.txt

    3public class PathNormalize {4    public static void main(String[] args) {5        int draft→ 1 = 1;  //@draft=2, 36        Path raw→ notes/drafts/../day1.txt = Path.of("notes", "drafts", "..", "day" + draft1 + ".txt");7        Path clean→ notes/day1.txt = raw.normalize();89        System.out.println("raw=" + rawnotes/drafts/../day1.txt);10        System.out.println("clean=" + cleannotes/day1.txt);11    }
    outputraw=notes/drafts/../day1.txt
clean=notes/day1.txt

  1. draft ← 2, raw ← notes/drafts/../day2.txt, clean ← notes/day2.txt

    3public class PathNormalize {4    public static void main(String[] args) {5        int draft→ 2 = 2;6        Path raw→ notes/drafts/../day2.txt = Path.of("notes", "drafts", "..", "day" + draft2 + ".txt");7        Path clean→ notes/day2.txt = raw.normalize();89        System.out.println("raw=" + rawnotes/drafts/../day2.txt);10        System.out.println("clean=" + cleannotes/day2.txt);11    }
    outputraw=notes/drafts/../day2.txt
clean=notes/day2.txt

  1. draft ← 3, raw ← notes/drafts/../day3.txt, clean ← notes/day3.txt

    3public class PathNormalize {4    public static void main(String[] args) {5        int draft→ 3 = 3;6        Path raw→ notes/drafts/../day3.txt = Path.of("notes", "drafts", "..", "day" + draft3 + ".txt");7        Path clean→ notes/day3.txt = raw.normalize();89        System.out.println("raw=" + rawnotes/drafts/../day3.txt);10        System.out.println("clean=" + cleannotes/day3.txt);11    }
    outputraw=notes/drafts/../day3.txt
clean=notes/day3.txt