Example usage for java.util Collections reverse

List of usage examples for java.util Collections reverse

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Introduction

In this page you can find the example usage for java.util Collections reverse.

Prototype

@SuppressWarnings({ "rawtypes", "unchecked" })
public static void reverse(List<?> list)

Source Link

Document

Reverses the order of the elements in the specified list.

This method runs in linear time.

Usage

From source file:de.thischwa.pmcms.view.context.object.Utils.java

/**
 * Reverse the order of a {@link Collection}. It's null-save. If the desired {@link Collection} is null or empty, 
 * an empty one will returned.//from  www.  jav  a2 s. c om
 * @param <T>
 * @param col The collection to reverse. Could be null or empty.
 * 
 * @return An empty collection if the desired one was empty or null, or the desired collection with the reversed order.
 */
public static <T> Collection<T> reverseCollection(Collection<T> col) {
    if (CollectionUtils.isEmpty(col))
        return new ArrayList<T>();
    ArrayList<T> arrayList = new ArrayList<T>(col);
    Collections.reverse(arrayList);
    return arrayList;
}

From source file:biomine.bmvis2.crawling.Databases.java

public static Collection<String> getDatabases() {
    if (dbs != null)
        return dbs;

    try {// ww  w .  j a v a2  s . c o  m
        String url = WebConstants.BIOMINE_URL + "stats/index.cgi?json_action=getdbs";
        String cont = URLUtils.getURLContents(new URL(url));
        Object arr = JSONValue.parse(cont);
        if (arr instanceof JSONArray) {
            JSONArray jarr = (JSONArray) arr;
            dbs = new ArrayList();
            for (Object dbo : jarr) {
                JSONObject jdb = (JSONObject) dbo;
                Object no = jdb.get("name");
                if (no != null)
                    dbs.add(no.toString());
            }
            Collections.reverse(dbs);
            return dbs;
        }
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (ClassCastException e) {
        // TODO: handle exception
    }
    return Collections.EMPTY_LIST;
}

From source file:com.tilab.ca.sse.core.util.SSEUtils.java

public static Map sortIntegersMap(Map passedMap) {
    LOG.debug("[sortHashMapIntegers] - BEGIN");
    List mapKeys = new ArrayList(passedMap.keySet());
    List mapValues = new ArrayList(passedMap.values());
    Collections.sort(mapValues);/*w  w  w. j  ava 2 s  . co  m*/
    Collections.reverse(mapValues);
    Collections.sort(mapKeys);
    Map sortedMap = new LinkedHashMap();
    Iterator valueIt = mapValues.iterator();
    while (valueIt.hasNext()) {
        Object val = valueIt.next();
        Iterator keyIt = mapKeys.iterator();
        while (keyIt.hasNext()) {
            Object key = keyIt.next();
            String comp1 = passedMap.get(key).toString();
            String comp2 = val.toString();
            if (comp1.equals(comp2)) {
                passedMap.remove(key);
                mapKeys.remove(key);
                sortedMap.put((Integer) key, (Integer) val);
                break;
            }
        }
    }
    LOG.debug("[sortHashMapIntegers] - END");
    return sortedMap;
}

From source file:net.fabricmc.installer.util.MavenHandler.java

public static void load(String mavenServerURL, String packageName, String jarName)
        throws IOException, ParserConfigurationException, SAXException, XmlPullParserException {
    String baseMavenMeta = IOUtils.toString(new URL(
            mavenServerURL + "/" + packageName.replace('.', '/') + "/" + jarName + "/maven-metadata.xml"),
            "UTF-8");
    Metadata metadata = new MetadataXpp3Reader().read(new StringReader(baseMavenMeta));
    latestVersion = metadata.getVersioning().getRelease();
    versions = metadata.getVersioning().getVersions();
    Collections.reverse(versions);
}

From source file:com.opengamma.analytics.financial.schedule.WeeklyScheduleCalculator.java

public LocalDate[] getSchedule(final LocalDate startDate, final LocalDate endDate, final boolean fromEnd) {
    Validate.notNull(startDate, "start date");
    Validate.notNull(endDate, "end date");
    Validate.isTrue(startDate.isBefore(endDate) || startDate.equals(endDate));
    final List<LocalDate> dates = new ArrayList<LocalDate>();
    if (fromEnd) {
        LocalDate date = endDate;
        while (!date.isBefore(startDate)) {
            dates.add(date);/*from w  w  w  .  ja v a  2  s.c  o  m*/
            date = date.minusDays(7);
        }
        Collections.reverse(dates);
        return dates.toArray(EMPTY_LOCAL_DATE_ARRAY);
    }
    LocalDate date = startDate;
    while (!date.isAfter(endDate)) {
        dates.add(date);
        date = date.plusDays(7);
    }
    return dates.toArray(EMPTY_LOCAL_DATE_ARRAY);
}

From source file:com.opengamma.analytics.financial.schedule.AnnualScheduleCalculator.java

@Override
public LocalDate[] getSchedule(final LocalDate startDate, final LocalDate endDate, final boolean fromEnd,
        final boolean generateRecursive) {
    Validate.notNull(startDate, "start date");
    Validate.notNull(endDate, "end date");
    Validate.isTrue(startDate.isBefore(endDate) || startDate.equals(endDate));
    if (startDate.equals(endDate)) {
        return new LocalDate[] { startDate };
    }/*  www  . j a  v  a2  s . c o m*/
    final List<LocalDate> dates = new ArrayList<LocalDate>();
    if (fromEnd) {
        LocalDate date = endDate;
        int i = 1;
        while (!date.isBefore(startDate)) {
            dates.add(date);
            date = generateRecursive ? date.minus(Period.ofYears(1)) : endDate.minus(Period.ofYears(i++));
        }
        Collections.reverse(dates);
        return dates.toArray(EMPTY_LOCAL_DATE_ARRAY);
    }
    LocalDate date = startDate;
    int i = 1;
    while (!date.isAfter(endDate)) {
        dates.add(date);
        date = generateRecursive ? date.plus(Period.ofYears(1)) : startDate.plus(Period.ofYears(i++));
    }
    return dates.toArray(EMPTY_LOCAL_DATE_ARRAY);
}

From source file:com.opengamma.analytics.financial.schedule.EndOfMonthAnnualScheduleCalculator.java

public LocalDate[] getSchedule(final LocalDate startDate, final LocalDate endDate, final boolean fromEnd) {
    Validate.notNull(startDate, "start date");
    Validate.notNull(endDate, "end date");
    final LocalDate[] monthly = EOM_CALCULATOR.getSchedule(startDate, endDate);
    final List<LocalDate> result = new ArrayList<LocalDate>();
    if (fromEnd) {
        for (int i = monthly.length - 1; i >= 0; i -= 12) {
            result.add(monthly[i]);//from w w  w  . j  a  v  a2 s . c  o  m
        }
        Collections.reverse(result);
        return result.toArray(EMPTY_LOCAL_DATE_ARRAY);
    }
    for (int i = 0; i < monthly.length; i += 12) {
        result.add(monthly[i]);
    }
    return result.toArray(EMPTY_LOCAL_DATE_ARRAY);
}

From source file:com.opengamma.analytics.financial.schedule.MonthlyScheduleCalculator.java

@Override
public LocalDate[] getSchedule(final LocalDate startDate, final LocalDate endDate, final boolean fromEnd,
        final boolean generateRecursive) {
    Validate.notNull(startDate, "start date");
    Validate.notNull(endDate, "end date");
    Validate.isTrue(startDate.isBefore(endDate) || startDate.equals(endDate));
    if (startDate.equals(endDate)) {
        return new LocalDate[] { startDate };
    }//from  w  ww .j ava  2 s. c o m
    final List<LocalDate> dates = new ArrayList<LocalDate>();
    if (fromEnd) {
        LocalDate date = endDate;
        int i = 1;
        while (!date.isBefore(startDate)) {
            dates.add(date);
            date = generateRecursive ? date.minus(Period.ofMonths(1)) : endDate.minus(Period.ofMonths(i++));
        }
        Collections.reverse(dates);
        return dates.toArray(EMPTY_LOCAL_DATE_ARRAY);
    }
    LocalDate date = startDate;
    int i = 1;
    while (!date.isAfter(endDate)) {
        dates.add(date);
        date = generateRecursive ? date.plus(Period.ofMonths(1)) : startDate.plus(Period.ofMonths(i++));
    }
    return dates.toArray(EMPTY_LOCAL_DATE_ARRAY);
}

From source file:com.opengamma.analytics.financial.schedule.EndOfMonthQuarterlyScheduleCalculator.java

public LocalDate[] getSchedule(final LocalDate startDate, final LocalDate endDate, final boolean fromEnd) {
    Validate.notNull(startDate, "start date");
    Validate.notNull(endDate, "end date");
    final LocalDate[] monthly = EOM_CALCULATOR.getSchedule(startDate, endDate);
    final List<LocalDate> result = new ArrayList<LocalDate>();
    if (fromEnd) {
        for (int i = monthly.length - 1; i >= 0; i -= 3) {
            result.add(monthly[i]);/*w ww.java2 s  . co m*/
        }
        Collections.reverse(result);
        return result.toArray(EMPTY_LOCAL_DATE_ARRAY);
    }
    for (int i = 0; i < monthly.length; i += 3) {
        result.add(monthly[i]);
    }
    return result.toArray(EMPTY_LOCAL_DATE_ARRAY);
}

From source file:com.opengamma.analytics.financial.schedule.EndOfMonthSemiAnnualScheduleCalculator.java

public LocalDate[] getSchedule(final LocalDate startDate, final LocalDate endDate, final boolean fromEnd) {
    Validate.notNull(startDate, "start date");
    Validate.notNull(endDate, "end date");
    final LocalDate[] monthly = EOM_CALCULATOR.getSchedule(startDate, endDate);
    final List<LocalDate> result = new ArrayList<LocalDate>();
    if (fromEnd) {
        for (int i = monthly.length - 1; i >= 0; i -= 6) {
            result.add(monthly[i]);/*  ww w .  j av a 2s. co m*/
        }
        Collections.reverse(result);
        return result.toArray(EMPTY_LOCAL_DATE_ARRAY);
    }
    for (int i = 0; i < monthly.length; i += 6) {
        result.add(monthly[i]);
    }
    return result.toArray(EMPTY_LOCAL_DATE_ARRAY);
}