Example usage for java.util LinkedList isEmpty

Introduction

In this page you can find the example usage for java.util LinkedList isEmpty.

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this list contains no elements.

Usage

From source file:sanghoon.flickr.photos.Dump.java

public static void main(String[] args) throws FileNotFoundException {

    //      args = new String[] { "-b", "-122.373971375,47.55575575,-122.3455185,47.585350625000004" };

    if (args.length < 1) {

        String header = "\n" + "Download all photos matching some criteria, using flickr.photos.search API."
                + "\n\n";

        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp("java " + Dump.class.getName() + " [OPTIONS]...", header, createOptions(), "");
        return;//from w ww .  j  a v  a 2 s.co  m
    }

    CommandLineParser parser = new DefaultParser();
    CommandLine line;
    try {
        line = parser.parse(createOptions(), args);
    } catch (ParseException exp) {
        System.err.println("Parsing failed.  Reason: " + exp.getMessage());
        return;
    }

    String tags = line.hasOption("tags") ? line.getOptionValue("tags") : null;

    String minTakenDate = line.hasOption("min-taken-date") ? line.getOptionValue("min-taken-date") : null;
    String maxTakenDate = line.hasOption("max-taken-date") ? line.getOptionValue("max-taken-date") : null;

    String bbox = line.hasOption("bounding-box") ? line.getOptionValue("bounding-box") : null;
    if (bbox == null) {
        System.err.println("bounding box parameter is required");
        return;
    }
    // TODO: places.find  places.getInfo  ? id bounding box 
    //      String woeID = line.hasOption("woe-id") ? line.getOptionValue("woe-id") : null;
    //      String placeID = line.hasOption("place-id") ? line.getOptionValue("place-id") : null;

    String outputFilePrefix = line.hasOption("output-file-prefix") ? line.getOptionValue("output-file-prefix")
            : "output";

    ApiKey key = ApiKey.load(ClassLoader.getSystemResourceAsStream("flickr_api_key.properties"));

    Map<String, String> outputs = new HashMap<>();

    String[] coords = bbox.split(",");

    double minimum_longitude = Double.parseDouble(coords[0]);
    double minimum_latitude = Double.parseDouble(coords[1]);
    double maximum_longitude = Double.parseDouble(coords[2]);
    double maximum_latitude = Double.parseDouble(coords[3]);

    LinkedList<BoundingBox> bboxes = new LinkedList<>();
    bboxes.add(new BoundingBox(minimum_longitude, minimum_latitude, maximum_longitude, maximum_latitude));

    int index = 0;

    while (bboxes.isEmpty() == false) {
        BoundingBox box = bboxes.pollFirst();

        int page = 1;

        System.out.print("searching for " + box.toString() + " .");

        Integer total = search(key, box, tags, minTakenDate, maxTakenDate, page, outputs);

        if (total == null) {
            bboxes.addLast(box);
            System.out.println(" failed, retry later");
            continue;
        } else if (MAX_PHOTOS_IN_A_BBOX < total) {
            // Please note that Flickr will return at most the first 4,000 results for any given search query. 
            // If this is an issue, we recommend trying a more specific query.

            //  
            List<BoundingBox> splitBoxes = box.split();
            for (BoundingBox splitBox : splitBoxes)
                bboxes.addLast(splitBox);

            System.out.print(" " + total + " photos (>" + MAX_PHOTOS_IN_A_BBOX + "), split ");

            System.out.print("{");
            for (int i = 0; i < splitBoxes.size(); i++) {
                if (0 < i)
                    System.out.print(",");
                System.out.print("[");
                System.out.print(splitBoxes.get(i).toString());
                System.out.print("]");
            }
            System.out.print("}");
            System.out.println();

            continue;
        } else if (PER_PAGE < total) {
            // ? search box ? ?  ? ?  
            // (?  ? PER_PAGE ?), 
            // page ?  

            while (page * PER_PAGE < total) {
                page++;
                search(key, box, tags, minTakenDate, maxTakenDate, page, outputs);
                System.out.print(".");
            }
            System.out.println(" " + total + " photos in " + page + " pages");
        }

        if (MAX_PHOTOS_IN_AN_OUTPUT < outputs.size()) {
            // ? ? ?  ? ?

            String filename = outputFilePrefix + "_" + index++ + ".json";
            write(outputs, filename);
            outputs.clear();
        }
    }

    String filename = outputFilePrefix + "_" + index++ + ".json";
    write(outputs, filename);

    System.out.println("finished");
}

---

From source file:example.Publisher.java

public static void main(String[] args) throws Exception {

    String user = env("ACTIVEMQ_USER", "admin");
    String password = env("ACTIVEMQ_PASSWORD", "password");
    String host = env("ACTIVEMQ_HOST", "localhost");
    int port = Integer.parseInt(env("ACTIVEMQ_PORT", "1883"));
    final String destination = arg(args, 0, "/topic/event");

    int messages = 10000;
    int size = 256;

    String DATA = "abcdefghijklmnopqrstuvwxyz";
    String body = "";
    for (int i = 0; i < size; i++) {
        body += DATA.charAt(i % DATA.length());
    }//from   w ww.  ja v a2s .  c om
    Buffer msg = new AsciiBuffer(body);

    MQTT mqtt = new MQTT();
    mqtt.setHost(host, port);
    mqtt.setUserName(user);
    mqtt.setPassword(password);

    FutureConnection connection = mqtt.futureConnection();
    connection.connect().await();

    final LinkedList<Future<Void>> queue = new LinkedList<Future<Void>>();
    UTF8Buffer topic = new UTF8Buffer(destination);
    for (int i = 1; i <= messages; i++) {

        // Send the publish without waiting for it to complete. This allows us
        // to send multiple message without blocking..
        queue.add(connection.publish(topic, msg, QoS.AT_LEAST_ONCE, false));

        // Eventually we start waiting for old publish futures to complete
        // so that we don't create a large in memory buffer of outgoing message.s
        if (queue.size() >= 1000) {
            queue.removeFirst().await();
        }

        if (i % 1000 == 0) {
            System.out.println(String.format("Sent %d messages.", i));
        }
    }

    queue.add(connection.publish(topic, new AsciiBuffer("SHUTDOWN"), QoS.AT_LEAST_ONCE, false));
    while (!queue.isEmpty()) {
        queue.removeFirst().await();
    }

    connection.disconnect().await();

    System.exit(0);
}

---

From source file:org.zoneproject.extractor.plugin.spotlight.App.java

public static void main(String[] args) {
    LinkedList<Item> itemsPending = new LinkedList<Item>();
    Prop[] fr = { new Prop(ZoneOntology.PLUGIN_LANG, "\"fr\"") };
    Prop[] en = { new Prop(ZoneOntology.PLUGIN_LANG, "\"en\"") };

    LinkedBlockingQueue<AnnotationThread> annotationThreads;
    HashMap<String, ArrayList<Prop>> propsToSave;
    propsPendingSave = new HashMap<String, ArrayList<Prop>>();
    while (true) {
        annotationThreads = new LinkedBlockingQueue<AnnotationThread>();

        while (true) {//while we can download items

            Item[] enItems = Database.getItemsNotAnotatedForPluginsWithDeps(PLUGIN_URI, en, SIM_DOWNLOADS / 2);
            Item[] frItems = Database.getItemsNotAnotatedForPluginsWithDeps(PLUGIN_URI, fr, SIM_DOWNLOADS / 2);
            Item[] items = (Item[]) ArrayUtils.addAll(enItems, frItems);

            if (items != null && items.length > 0) {
                //check if the item is in annotation process
                for (Item i : items) {
                    boolean exist = false;
                    for (AnnotationThread a : annotationThreads) {
                        if (a.item.getUri().equals(i.getUri())) {
                            exist = true;
                        }//from  ww  w  . j a v a 2  s .  c  om
                    }
                    if (!exist) {
                        itemsPending.add(i);
                    }
                }
            }
            if (itemsPending.isEmpty()) {
                break;
            }

            while (!itemsPending.isEmpty()) {

                //we add new thread until the limit length is thrown
                while (annotationThreads.size() < SIM_ANNOTATE && !itemsPending.isEmpty()) {
                    AnnotationThread newAnnot = new AnnotationThread(itemsPending.removeFirst());
                    newAnnot.start();
                    annotationThreads.add(newAnnot);
                }

                //try{
                //we try to end some terminated threads
                //synchronized(annotationThreads){
                for (AnnotationThread a : annotationThreads) {
                    if (!a.isAlive()) {
                        annotationThreads.remove(a);
                    } else if (a.getDuration() > LIMIT_TIME_FOR_DOWN) {
                        a.interrupt();
                    } else if (a.getDuration() > 10) {
                        logger.info("is alive[" + a.getDuration() + "]: " + a.item.getUri());
                    }
                    //try{Thread.currentThread().sleep(1000);}catch(Exception ie){}//TODO remove
                }
                //}
                //}catch(java.util.ConcurrentModificationException concurrentAccess){
                //    logger.warn("concurrent access!");
                //}

                if (annotationThreads.size() >= SIM_ANNOTATE) {
                    try {
                        Thread.currentThread().sleep(1000);
                    } catch (Exception ie) {
                    }
                }
            }

            logger.info("start saving");
            synchronized (propsPendingSave) {
                propsToSave = (HashMap<String, ArrayList<Prop>>) propsPendingSave.clone();
                propsPendingSave.clear();
            }
            Database.addAnnotations(propsToSave);
            logger.info("end saving");

        }

        logger.info("no more items to annotate");
        try {
            Thread.currentThread().sleep(1000);
        } catch (Exception ie) {
        }
    }
}

---

From source file:Main.java

/**
 * Returns the last element of list. If the given list is empty, the
 * returned value will be null.//from   w  w w  .  j av a  2s  .c o m
 *
 * @param <T> Class type
 * @param collection List of elements
 * @return Last element of list
 */
public static <T> T getLastElement(Collection<T> collection) {
    LinkedList<T> elements = collection == null ? new LinkedList<>() : new LinkedList<>(collection);
    return elements.isEmpty() ? null : elements.getLast();
}

---

From source file:com.thinkbiganalytics.metadata.jpa.support.QueryDslPathInspector.java

private static Object getFieldObject(BeanPath basePath, LinkedList<String> paths)
        throws IllegalAccessException {
    if (!paths.isEmpty()) {
        String currPath = paths.pop();
        Object o = getObjectForField(basePath, currPath);
        if (o != null && o instanceof BeanPath && !paths.isEmpty()) {
            return getFieldObject((BeanPath) o, paths);
        }//w  ww  .j  av  a 2 s. co m
        return o;
    }
    return null;
}

---

From source file:com.smallnn.input.FileUtil.java

public static List<File> find(File file, FileFilter filter) {
    List<File> result = new ArrayList<File>();
    LinkedList<File> stack = new LinkedList<File>();
    stack.push(file);/*from   ww w .  j ava2  s. c  om*/
    while (!stack.isEmpty()) {
        File f = stack.pop();
        if (filter == null || filter.accept(f)) {
            result.add(f);
        }

        if (f.isDirectory() && f.exists()) {
            stack.addAll(Arrays.asList(f.listFiles()));
        }
    }
    return result;
}

---

From source file:com.abuabdul.notedovn.util.NoteDovnUtil.java

public static LinkedList<ScratchNote> filterAndSortByCategory(LinkedList<ScratchNote> notes) {
    if (!notes.isEmpty()) {
        LinkedList<ScratchNote> category = newLinkedList(filter(notes, categoryPredicate()));
        sort(category, categoryComparator());
        return category;
    }/*from   ww  w . j  a  v  a2 s  .com*/
    return notes;
}

---

From source file:com.abuabdul.notedovn.util.NoteDovnUtil.java

public static LinkedList<ScratchNote> filterAndSortByUpdatedDate(LinkedList<ScratchNote> notes) {
    if (!notes.isEmpty()) {
        LinkedList<ScratchNote> updateDate = newLinkedList(filter(notes, categoryPredicateNulls()));
        sort(updateDate, updatedDateComparator());
        return updateDate;
    }/* w w w. j  av  a2s  .com*/
    return notes;
}

---

From source file:Main.java

public static int insertX(int numb, int random) {
    long result = 0;
    LinkedList<Integer> stack = new LinkedList<Integer>();
    while (numb > 0) {
        stack.push(numb % 10);//from  w w  w .java  2s .  com
        numb = numb / 10;
    }

    while (!stack.isEmpty()) {
        result = (int) combinedTwoNumber(result, stack.pop());
        result = (int) combinedTwoNumber(result, random);
    }

    return (int) (result /= 10);
}

---

From source file:org.diorite.config.impl.NestedNodesHelper.java

@Nullable
@SuppressWarnings("unchecked")
static Object remove(Object object, LinkedList<String> path) {
    while (true) {
        if (path.isEmpty()) {
            throw new IllegalArgumentException("Empty path given");
        }/*w  w  w . ja va 2s.  c  om*/
        String current = path.removeFirst();
        try {
            Object val;
            if (object instanceof Config) {
                val = ((Config) object).remove(current);
            } else if (object instanceof Map) {
                val = ((Map<Object, Object>) object).remove(current);
            } else if (object instanceof List) {
                val = ((List<Object>) object).remove(Integer.parseInt(current));
            } else {
                throw new IllegalStateException("Can't remove class property!");
            }
            if (path.isEmpty()) {
                return val;
            }
            Validate.notNull(val, "Value on: " + current + " in " + object + " is null");
            object = val;
        } catch (Exception e) {
            throw new IllegalStateException("Can't find property: " + current + " (" + path + ") in: " + object,
                    e);
        }
    }
}

---

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