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mmathieum · 2026-02-03T14:36:31Z

Most GTFS trip IDs are not reused in new schedules so we need to remove unused ones every time.

gemini-code-assist · 2026-02-03T14:36:47Z

Summary of Changes

Hello @mmathieum, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new cleanup mechanism to remove unused trip IDs from the system. By integrating a cleanupIds method into the data processing pipeline, the system can now identify and discard trip IDs that are no longer associated with any routes, thereby optimizing data storage and improving overall data integrity.

Highlights

New ID Cleanup Mechanism: A new cleanupIds() method has been introduced in GSpec.java to identify and remove trip IDs that are no longer associated with any routes.
Integration into Processing Flow: The cleanupIds() method is now called within the DefaultAgencyTools processing pipeline, ensuring that unused IDs are removed during data generation.
MTripIds Removal Functionality: A remove() method has been added to MTripIds.kt to provide a mechanism for safely deleting trip IDs from the internal mapping structures.

Changelog

src/main/java/org/mtransit/parser/DefaultAgencyTools.java
- Added a call to gtfs.cleanupIds() to the data processing pipeline.
src/main/java/org/mtransit/parser/gtfs/data/GSpec.java
- Introduced cleanupIds() method to remove trip IDs not associated with any routes.
- Added necessary imports for MTripId and MTripIds.
- Added @SuppressWarnings("unused") to getAllStopIds().
src/main/java/org/mtransit/parser/mt/data/MTripIds.kt
- Implemented a remove(tripId: MTripId) function to delete trip IDs from internal maps.

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Code Review

This pull request introduces a mechanism to remove unused trip IDs, which helps in cleaning up data. The implementation adds a cleanupIds method in GSpec that iterates through trip IDs and removes those not associated with any route. A corresponding remove method is added to MTripIds. The logic is sound. I have one suggestion to improve the performance of the new cleanup logic by avoiding an unnecessary sorting operation.

src/main/java/org/mtransit/parser/gtfs/data/GSpec.java

mmathieum · 2026-02-03T15:08:34Z

/gemini review

gemini-code-assist

Code Review

This pull request introduces a mechanism to remove unused GTFS trip IDs, which is a necessary cleanup step. The changes are logical, particularly the switch from HashSet to HashMap for mTrips to allow for efficient lookups.

I have a few suggestions to improve the implementation:

Correct a minor typo in a log message.
Refactor the trip merging logic to be more concise using putIfAbsent.
Improve the memory efficiency of the unused trip ID removal process by avoiding the creation of a large intermediate list.

Overall, good work on addressing the need to prune unused IDs.

src/main/java/org/mtransit/parser/mt/MGenerator.java

mmathieum · 2026-02-03T15:41:39Z

/gemini review

gemini-code-assist

Code Review

This pull request introduces a feature to remove unused trip IDs, which is an important cleanup step. The implementation correctly changes the data structure for trips to a HashMap for efficient processing and adds the pruning logic. My review includes a suggestion to improve the performance of the new prune method in MTripIds.kt, which could be a bottleneck with large GTFS datasets. The rest of the changes look good and are consistent with the PR's objective.

src/main/java/org/mtransit/parser/mt/data/MTripIds.kt

- commons: CI: add frequently used gh command with inputs in comments - parser: Remove unused trip IDs ints. mtransitapps/parser#31 - parser: Schedule > clear head-sign instead of setting empty string mtransitapps/parser#30 - parser: Data Changed > compat with service IDs regex mtransitapps/parser#32

…s/parser#31

- commons: CI: add frequently used gh command with inputs in comments - commons: Auto-trigger data sync when archive contains newer data than deployed mtransitapps/commons#537 - parser: Remove unused trip IDs ints. mtransitapps/parser#31 - parser: Schedule > clear head-sign instead of setting empty string mtransitapps/parser#30 - parser: Data Changed > compat with service IDs regex mtransitapps/parser#32

- commons: CI: add frequently used gh command with inputs in comments - commons: Auto-trigger data sync when archive contains newer data than deployed mtransitapps/commons#537 - parser: fix compat with no last service calendar dates - parser: Remove unused trip IDs ints. mtransitapps/parser#31 - parser: Schedule > clear head-sign instead of setting empty string mtransitapps/parser#30 - parser: Data Changed > compat with service IDs regex mtransitapps/parser#32

- commons: CI: add frequently used gh command with inputs in comments - commons: Auto-trigger data sync when archive contains newer data than deployed mtransitapps/commons#537 - parser: Fix compat with service IDs only used for data changed - parser: fix compat with no last service calendar dates - parser: Remove unused trip IDs ints. mtransitapps/parser#31 - parser: Schedule > clear head-sign instead of setting empty string mtransitapps/parser#30 - parser: Data Changed > compat with service IDs regex mtransitapps/parser#32

- commons: mt-sync-code-data.yml > fix skip on main repo - commons: CI: add frequently used gh command with inputs in comments - commons: Auto-trigger data sync when archive contains newer data than deployed mtransitapps/commons#537 - parser: Fix compat with service IDs only used for data changed - parser: fix compat with no last service calendar dates - parser: Remove unused trip IDs ints. mtransitapps/parser#31 - parser: Schedule > clear head-sign instead of setting empty string mtransitapps/parser#30 - parser: Data Changed > compat with service IDs regex mtransitapps/parser#32

Remove unused trip IDs ints.

23ab23e

mmathieum self-assigned this Feb 3, 2026

mmathieum added the data_change Triggers data changes label Feb 3, 2026

mmathieum marked this pull request as ready for review February 3, 2026 14:36

gemini-code-assist bot reviewed Feb 3, 2026

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src/main/java/org/mtransit/parser/gtfs/data/GSpec.java Outdated Show resolved Hide resolved

mmathieum added 2 commits February 3, 2026 10:04

fix

7057c06

fix

b7e77aa

gemini-code-assist bot reviewed Feb 3, 2026

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src/main/java/org/mtransit/parser/mt/MGenerator.java Show resolved Hide resolved

src/main/java/org/mtransit/parser/mt/MGenerator.java Outdated Show resolved Hide resolved

src/main/java/org/mtransit/parser/mt/MGenerator.java Outdated Show resolved Hide resolved

mmathieum added 4 commits February 3, 2026 10:31

PR comments

8ed1815

PR comments

2e30cc1

cleanup

8b911e5

cleanup

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src/main/java/org/mtransit/parser/mt/data/MTripIds.kt Outdated Show resolved Hide resolved

mmathieum added 3 commits February 3, 2026 10:59

PR comment

52c821f

Merge branch 'master' into mm/remove_unused_trip_ids

ccf5742

Merge branch 'master' into mm/remove_unused_trip_ids

312c5fb

mmathieum merged commit 5e2c513 into master Feb 3, 2026
4 checks passed

mmathieum deleted the mm/remove_unused_trip_ids branch February 3, 2026 19:54

montransit added a commit to mtransitapps/mtransit-for-android that referenced this pull request Feb 3, 2026

CI: Sync code from 'parser': Remove unused trip IDs ints. mtransitapp…

df6a3e9

…s/parser#31

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Remove unused trip IDs ints.#31

Remove unused trip IDs ints.#31
mmathieum merged 10 commits intomasterfrom
mm/remove_unused_trip_ids

mmathieum commented Feb 3, 2026 •

edited

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mmathieum commented Feb 3, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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mmathieum commented Feb 3, 2026 •

edited

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