@Override
public Object extractRuleKeyAppendables(
BuildTarget target, BuildRuleResolver resolver, String input) throws MacroException {
return FluentIterable.from(
getHasClasspathEntries(resolve(target, resolver, input)).getTransitiveClasspathDeps())
.filter(
new Predicate<JavaLibrary>() {
@Override
public boolean apply(JavaLibrary input) {
return input.getPathToOutput() != null;
}
})
.transform(SourcePaths.getToBuildTargetSourcePath())
.toSortedSet(Ordering.natural());
}
