feat: New rule - SingleShapePointValidator for flagging shapes with a single shape point

[praneethd7]

Summary:

Reference - #1733. Some GTFS feeds have shapes with a single shape point. These route shapes cannot be visualized on any GIS software (which requires LineString) and are therefore indicative of an error in the creation (as a line requires a minimum of two points)

Expected behavior:

The new rule flags such cases with the single_shape_point notice which reports the shape_id and csvRowNumber of the shape with a single shape point(one row in the feed).

Example Feed - LANTA GTFS:

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[qcdyx]

Hello @praneethd7, thank you for contributing to the GTFS Validator. I have two pieces of feedback:

1. The Java Formatting check is failing. Could you fix it by running ./gradlew goJF or gradle goJF?
2. The Rule acceptance test/compare-outputs check is failing. There are 22 new warnings out of 1520 datasets (~1%) that are invalid due to code change, which exceeds the 1% threshold. Could you review these 22 datasets to see if they actually have the single shape point issue?

[praneethd7]

Hi @qcdyx! Thank you for your suggestions. I have re-formatted the code according to the Google Java format. Is there a way to know which are those 22 feeds that have this error? Also, I am not sure if I have access to all of them. Please let me know.😄

[qcdyx]

Hello @praneethd7 Yes, you have access to those 22 feeds. To get them, goto https://github.com/MobilityData/gtfs-validator/actions/runs/9197621511?pr=1753, scroll down to bottom, find the [acceptance_test_report] artifact(https://github.com/MobilityData/gtfs-validator/actions/runs/9197621511/artifacts/1541824946), and download it. Unzip acceptance_test_report.zip, open acceptance_test_report.json and search for "sourceUrl", you can click the link and download the dataset. Don't forget to format code again since we merge master branch into your branch.

[praneethd7]

@qcdyx Thank you for helping me with the code formatting. I have manually checked the 22 feeds and they all have single_shape_point error. I have verified the notice counts for each feed and everything seems to be reported correctly. I guess we are good to go :)

[qcdyx]

@emmambd Should we consult with the spec team to verify the naming and description of the single_shape_point notice?

[emmambd]

@qcdyx No, that one's for me to review! @praneethd7 The name looks great! I made a minor comment on the description for the sake of being generic.

[praneethd7]

@emmambd @qcdyx Thank you for the suggestions. Changed the rule description

[qcdyx]

@praneethd7 Great, you PR is merged. Thanks again for contributing to GTFS Validator.

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