resource_loader.java

class HierarchyAwareResourceLoader {
  
 private final List<String> searchPaths;
 
 public HierarchyAwareResourceLoader(List<String> searchPaths){
   this.searchPaths = searchPaths;
 }
 
 public Optional<File> load(String name){
   Optional<File> result = FluentIterable.from(searchPaths).
    transform(ConcatPath.with(name)).
    transform(File.createFromPath()).
    filter(File.ifExists()).
    first();
    
    return result;
 } 
}