Exemplo n.º 1
0
  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);
    }
  }
Exemplo n.º 2
0
 public static <T> void show(String title, Stream<T> stream) {
   final int SIZE = 10;
   List<T> firstElements = stream.limit(SIZE + 1).collect(Collectors.toList());
   System.out.print(title + ": ");
   if (firstElements.size() <= SIZE) System.out.println(firstElements);
   else {
     firstElements.remove(SIZE);
     String out = firstElements.toString();
     System.out.println(out.substring(0, out.length() - 1) + ", ...]");
   }
 }
  public Stream unmarshall(JsonUnmarshallerContext context) throws Exception {
    Stream stream = new Stream();

    int originalDepth = context.getCurrentDepth();
    String currentParentElement = context.getCurrentParentElement();
    int targetDepth = originalDepth + 1;

    JsonToken token = context.getCurrentToken();
    if (token == null) token = context.nextToken();
    if (token == VALUE_NULL) return null;

    while (true) {
      if (token == null) break;

      if (token == FIELD_NAME || token == START_OBJECT) {
        if (context.testExpression("StreamArn", targetDepth)) {
          context.nextToken();
          stream.setStreamArn(context.getUnmarshaller(String.class).unmarshall(context));
        }
        if (context.testExpression("TableName", targetDepth)) {
          context.nextToken();
          stream.setTableName(context.getUnmarshaller(String.class).unmarshall(context));
        }
        if (context.testExpression("StreamLabel", targetDepth)) {
          context.nextToken();
          stream.setStreamLabel(context.getUnmarshaller(String.class).unmarshall(context));
        }
      } else if (token == END_ARRAY || token == END_OBJECT) {
        if (context.getLastParsedParentElement() == null
            || context.getLastParsedParentElement().equals(currentParentElement)) {
          if (context.getCurrentDepth() <= originalDepth) break;
        }
      }
      token = context.nextToken();
    }

    return stream;
  }