Pathfinder path matching and utilities

Resolve paths for identifier patterns.

Example: Hierarchical paths for many files

bsb12345678_hocr.xml → /storage/12/34/56/78.xml

Example: Find the matching formats on disk:

bsb12345678 → /storage/12/34/56/78.jp2
bsb12345678 → /storage/12/34/56/78.tif
bsb12345678 → /storage/12/34/56/78.jpg

Pathfinder can yield the first filepath for that ID that exists.

Usage

Java-only

public class PathfinderTest {

  @Test
  void shouldMatchPattern() {
    Pathfinder pathfinder = new Pathfinder()
        .addPattern("^(\\w{3})(\\d{4})(\\d{4})$",
            "/path/to/%2$s/%1$s%2$s%3$s_hocr.xml")
        .addPattern("^(\\w{3})(\\d{4})(\\d{4})-(\\w{16})$",
            "/other/path/to/%2$s/%4$s.xml")
        .addPattern("^(\w{5})$",
            "%1$.txt", "%1$.xml", "%1$.bin");

    assertThat(pathfinder.find("bsb40041234"))
        .contains(Path.of("/path/to/4004/bsb40041234_hocr.xml"));

    assertThat(pathfinder.find("bsb40041234-hasvalue87654321"))
        .contains(Path.of("/other/path/to/4004/hasvalue87654321.xml"));

    assertThat(pathfinder.find("12345"))
        .contains(Path.of("12345.txt"), Path.of("12345.xml"), Path.of("12345.bin"));
  }

}

Spring Boot

In application.yml:

pathfinder:
  patterns:
    - pattern: '^(\w{3})(\d{4})(\d{4})$'
      template: '/bsbstruc/content/bsb_content%2$s/%1$s%2$s%3$s/xml/hocr/1.0/%1$s%2$s%3$s_hocr.xml'
    - pattern: '^(\w{3})(\d{2})(\d{2})(\d{2})(\d{2})-(\w{16})$'
      template: '/bsb_fastocr/%1$s%2$s/%3$s/%4$s/%5$s/hocr_%6$s.html'
    - pattern: '^(\w{5})$'
      templates:
        - '/data/%1$.txt'
        - '/data/%1$.xml'
        - '/data/%1$.bin'

To specify patterns, use Java regular expression syntax. For the path templates the full power of java.util.Formatter is available. Templates support the ~/ abbreviation for user home directories.

@EnablePathfinder
class Application {

  private final Pathfinder pathfinder;

  public Application(Pathfinder pathfinder) {
    this.pathfinder = pathfinder;
  }

  // ...

}