Add Missing License Headers

[syoon2]

Regarding the question of adding the license headers to the -info.java files, yes, that would be a good as a separate PR. If you do that, be sure to remove the exclusions in etc/jgrapht_checks.xml and etc/checkstyle_suppressions.xml.

Originally posted by @jsichi in #1213 (comment)

This PR adds the missing license headers to the module-info.java and package-info.java files and updates the Checkstyle rule accordingly.

The added license headers respect (or at least try to respect) the original authorships of the files, i.e., the year that the file was added and the original author's name are included, not my name and 2024.

---

• I read and understood https://github.com/jgrapht/jgrapht/wiki/Become-a-Contributor
• I read and understood https://github.com/jgrapht/jgrapht/wiki/How-to-make-your-first-%28code%29-contribution
• I added unit tests
• I added documentation
• I followed the Coding and Style Conventions
• I have not modified HISTORY.md or CONTRIBUTORS.md
• I ensured that the git commit message is a good one

[syoon2]

Original author(s) of the module-info.java files

• org.jgrapht.core, org.jgrapht.demo, org.jgrapht.ext, org.jgrapht.guava, org.jgrapht.io, org.jgrapht.opt: @d-michail (Modules support #938)
• org.jgrapht.unimi.dsi: @d-michail (Webgraph adapter #1002 / 4881260)

[syoon2]

Original author(s) of the package-info files and their respective commits / PRs

• org.jgrapht.core module
  • Files changed in 03078d1: @d-michail (dc3ccfa)
  • org.jgrapht.graph.concurrent (8a96631): @Yimismi (add class for supporting synchronized graph #500)
  • org.jgrapht.generate.netgen (2c05fe7): @Toptachamann (Improved NETGEN-style problems generator #955)
  • org.jgrapht.alg.flow.mincost (5712781): @Toptachamann (Successive shortest path algorithm with capacity scaling for minimum cost flow problem #651 / e2a5ad9)
  • org.jgrapht.alg.drawing (5bb7065): @d-michail (A simple graph drawing component #738)
  • org.jgrapht.alg.scoring (73f97de): @d-michail (bde03c2)
  • org.jgrapht.alg.matching.blossom.v5 (5490ca2): @Toptachamann (Kolmogorov's Blossom V implementation #595)
  • org.jgrapht.alg.matching (e426dbd): @d-michail (Approximation algorithms for maximum weight matching in arbitrary graphs #281)
  • org.jgrapht.alg.spanning (f680811): @d-michail (Borůvka's algorithm, spanning tree algorithms bundle and interfaces #329)
  • org.jgrapht.alg.similarity (5f8d5ab): @SChudakov (A simple graph drawing component #738)
  • org.jgrapht.alg.color (6fbd2b2): @d-michail (Greedy coloring algorithms #356)
  • org.jgrapht.alg.linkprediction (5b9e41f): @d-michail (A collection of local algorithms for link prediction. #1004)
  • org.jgrapht.alg.transform (3084fa6): @jkinable (Linegraph implementation #687)
  • org.jgrapht.alg.tour (a982691): @d-michail (2-approximation algorithm for metric TSP #363)
  • org.jgrapht.alg.independentset (1b10432): @jkinable (Refactoring ChordalityInspector and interface revision #547)
  • Files changed in 06819bb
    • org.jgrapht.alg.connectivity: @jkinable (Connectivity #424)
    • org.jgrapht.alg.densesubgraph: @Aimmig (Maximum density subgraphs #719)
    • org.jgrapht.alg.partition: @AlexandruValeanu (Partition interface, package and BipartitePartitionFinder #613)
    • org.jgrapht.alg.clustering: @d-michail (k-spanning-tree clustering algorithm #835)
    • org.jgrapht.alg.clique: @d-michail (The lca package #597)
    • org.jgrapht.alg.lca: @AlexandruValeanu (The lca package #597)
    • org.jgrapht.alg.decomposition: @AlexandruValeanu (Heavy path decomposition #606)
    • org.jgrapht.alg.planar: @Toptachamann (Boyer-Myrvold planarity testing algorithm #795)
    • org.jgrapht.alg.shortestpath: @d-michail (Revised shortest path algorithms #317)
• org.jgrapht.io module
  • Files changed in a07bc51: @d-michail (Sparse graphs, importers and improved algorithms #829)
  • Files changed in d365207
    • org.jgrapht.nio.gexf: @d-michail (GEXF importer/exporter #909)
    • org.jgrapht.nio.tsplib: @HannesWell (Add TSPLIB95-importer #869)
• org.jgrapht.opt module (c70d347): @d-michail (Opt fixes and specifics strategy simplification #665, Sparse graphs, importers and improved algorithms #829, Refactored sparse graphs to allow different backend implementations #1029)
• org.jgrapht.graph.guava (653b736): @d-michail (Guava adapter #532)
• org.jgrapht.unimi.dsi module (1864b20)
  • org.jgrapht.webgraph: @vigna (Webgraph adapter #1002 / e1e7cee)
  • org.jgrapht.sux4j: @vigna (Succinct graph representations #1041)

[jsichi]

I think in etc/jgrapht_checks.xml we need to remove the BeforeExecutionExclusionFileFilter so that module-info.java gets checked as well.

[syoon2]

I think in etc/jgrapht_checks.xml we need to remove the BeforeExecutionExclusionFileFilter so that module-info.java gets checked as well.

Something that I missed. Thanks for catching 😄

[syoon2]

Turns out, we cannot enable Checkstyle running on module-info.java files due to an upstream issue...