public static void main(String[] args) throws IOException {
Path path = Paths.get("../alice.txt");
String contents = new String(Files.readAllBytes(path), StandardCharsets.UTF_8);
Stream<String> words = Stream.of(contents.split("[\\P{L}]+"));
show("words", words);
Stream<String> song = Stream.of("gently", "down", "the", "stream");
show("song", song);
Stream<String> silence = Stream.empty();
silence = Stream.<String>empty(); // Explicit type specification
show("silence", silence);
Stream<String> echos = Stream.generate(() -> "Echo");
show("echos", echos);
Stream<Double> randoms = Stream.generate(Math::random);
show("randoms", randoms);
Stream<BigInteger> integers = Stream.iterate(BigInteger.ONE, n -> n.add(BigInteger.ONE));
show("integers", integers);
Stream<String> wordsAnotherWay = Pattern.compile("[\\P{L}]+").splitAsStream(contents);
show("wordsAnotherWay", wordsAnotherWay);
try (Stream<String> lines = Files.lines(path, StandardCharsets.UTF_8)) {
show("lines", lines);
}
}
/**
* Checks if a given file exists and, if not, create it by copying a default template from
* resources; used to create default conf files.
*
* @param file The path of the file that needs to exist
* @param template The path of the template for the file
*/
public static void ensureFileExists(final String file, final String template) {
if (LAUNCHED_FROM_JAR && !Files.exists(Paths.get(file))) {
if (Debug.on) printDebug("[Meta] " + file + " does not exist: creating a default one.");
InputStream stream = Meta.class.getResourceAsStream(template);
if (stream == null) {
printDebug(
"[ WARNING ] template for "
+ template
+ " not found. Won't create a default "
+ file
+ ".");
} else {
int readBytes;
byte[] buffer = new byte[4096];
try (OutputStream outStream = new FileOutputStream(new File(file))) {
while ((readBytes = stream.read(buffer)) > 0) {
outStream.write(buffer, 0, readBytes);
}
if (Debug.on)
printDebug("[Meta] created default file " + file + " from " + template + ".");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
stream.close();
} catch (IOException ignore) {
}
}
}
} else {
if (Meta.LAUNCHED_FROM_JAR && Debug.on) printDebug("[Meta] file exists: " + file + ".");
}
}
static {
String tmp = Meta.class.getProtectionDomain().getCodeSource().getLocation().getPath();
// Strip the leading slash if on windows
if (tmp.matches("^/[A-Z]:/.*")) {
tmp = tmp.substring(1);
}
cwd = Paths.get(tmp);
}
/**
* Searches for the directory 'dirPath'; if not found, tries to create it, then returns a File
* object for that directory.
*/
public static File ensureDirExists(final String dirPath) {
File dirpath = new File(dirPath);
if (!dirpath.isDirectory()) {
if (!dirpath.exists()) {
printDebug("[Meta] " + dirpath + " does not exist: creating it...");
try {
Files.createDirectories(Paths.get(dirpath.getPath()));
return dirpath;
} catch (IOException e) {
printDebug("[Meta] Exception while creating directory:");
e.printStackTrace();
return null;
}
} else {
printDebug(
"[Meta] Error: path `"
+ dirpath
+ "' is not a valid directory path, and could not create it.");
return null;
}
} else return dirpath;
}
