MergeMojo implementation based on MergeTask

[hrmohr]

Same functionality as the MergeTask taking a list of FileSet as input with a single destFile output

[marchof]

@Godin Can you please quickly review this? This looks like a simple but valuable addition for our Maven support.

[marchof]

@hrmohr Thanks for the quick response! I'll try to get @Godin in the loop to get this reviewed asap. He is in charge of the JaCoCo Maven integration.

[marchof]

Documentation: The term is "execution data files (*.exec)" instead of "execution data store files"

[hrmohr]

I also updated the javadoc for ant task

[marchof]

@hrmohr Thx!

[Godin]

Is it possible to use single fileSet here ( *.exec ) ?

[Godin]

Guys, code looks good for me ( good job @hrmohr and thanks for contribution ), except of minor comments about integration test. @marchof I let you decide - merge as it is now and adjust integration test later or adjust before merge. Also we should not forget to update changelog.

[hrmohr]

Three times yes to your questions @Godin. Should I commit these changes to the integration test?

The input validation can also be improved because it wont fail if a valid fileset definition finds no execution data files for merging. It will only fail if no filesets are defined.
Perhaps it would also be nice if one could define a single fileset instead of a list with a single fileset.

[marchof]

@hrmohr Yes, please update the pull request directly.

I wouldn't fail if no files are found, maybe just log a info. So the plugin can be used in a generic way.

The list of filesets is probably more flexible.

[hrmohr]

I kept the list of filesets and handled missing execution files as suggested. Unless you want me to change anything this should be my last changes.

[marchof]

Thnak you! I'll going to merge this.