public List<T> collect() {
List<T> list = new ArrayList<>();
for (Pair<String, String> p : map.keySet()) {
String folder = p.first;
String pattern = p.second;
Function<String, ? extends T> func = map.get(p);
DirectoryStream<Path> dirStream;
try {
dirStream = Files.newDirectoryStream(Paths.get(folder), pattern);
logger.info(String.format("Load files from folder %s with pattern %s.", folder, pattern));
// sort the files
List<String> files = new ArrayList<>();
dirStream.forEach(s -> files.add(s.toString()));
Collections.sort(files);
for (String s : files) {
logger.info(String.format("Loading file %s.", s));
list.add(func.apply(s));
}
} catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(String.format("Could not load files from patern: %s", pattern));
}
}
return list;
}
private static List<Path> filesInDirectory(String resource)
throws IOException, URISyntaxException {
List<Path> files = new ArrayList<>();
try (DirectoryStream<Path> directoryStream =
Files.newDirectoryStream(
Paths.get(RandomKnapsackTest.class.getResource(resource).toURI()))) {
directoryStream.forEach(files::add);
}
return files;
}