[WIP][Java] Using functions for mapping #1007
Open
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This PR replaces "array" based ID mappings with a more free-form mapping based on functions.
This should be more efficient both when the number of IDs is huge (you don't need to actually allocate big list for all IDs to map) and in general (as it won't need to perform boxing/unboxing of integers).
It should also be more flexible; as an example, I have introduced a simple helper to wrap a list, so that the previous approach can still be used. The same can be done for maps etc.
WIP as this lacks (and needs) tests
Relates to #699