private Optional<Artifact> xctestIpa() {
FileProvider fileProvider =
ruleContext.getPrerequisite("xctest_app", Mode.TARGET, FileProvider.class);
if (fileProvider == null) {
return Optional.absent();
}
List<Artifact> files =
Artifact.filterFiles(fileProvider.getFilesToBuild(), FileType.of(".ipa"));
if (files.size() == 0) {
return Optional.absent();
} else if (files.size() == 1) {
return Optional.of(Iterables.getOnlyElement(files));
} else {
throw new IllegalStateException("Expected 0 or 1 files in xctest_app, got: " + files);
}
}
