[PLUGIN-1742] Fix EmptyInputFormat failure outside of Core Plugins #1843
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Fix EmptyInputFormat failure outside of Core Plugins
Description
Plugins that extend from AbstractFileSource (link) which are outside of the Core Plugins module will not correctly export the EmptyInputFormat that is required when we need to handle the case where the source input is empty.
Patch Description
This PR adds a method
getEmptyInputFormatClassName
that class can override to provide their own implementation for an emptyInputFormat.Renamed
EmptyInputFormat
toAbstractEmptyInputFormat
so this can be extended by other classes as their ownEmptyInputFormat
to reduce code duplication.