tree 990932d38d6eb3035c21b9dc55a106e4aa3d9c60
parent 29ddae8e0df41bf53d3c55d429dba51ee4516159
author Dan Ringwalt <ringwalt@google.com> 1623332615 -0400
committer Daniel Ringwalt <ringwalt@google.com> 1623871409 -0400

Introduce ArrayHelper.setAt() to use with EnumMap.

This makes sure the out of bounds index access is encapsulated so that
it can be super-sourced for WASM.

J2CL uses the GWT emul sources, and the same sources also transpile to
WASM (unless the entire implementation must be different using
super-wasm sources, which is generally not true for collections
classes). For these classes, array elements should not be read or
assigned out of bounds, which will result in a WASM exception (for
WASM-GC arrays). ArrayHelper will have a super-wasm implementation,
which will resize the backing array if needed before proceeding.

Like the original EnumMap helper method, this returns the original value
at the index (or else null), which can be done efficiently in GWT
without bounds checks.

PiperOrigin-RevId: 378638984
Change-Id: Ia19caef0576f8064a23b7cc73b20eea445e18b60