Example usage for java.util Collection isEmpty

Introduction

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

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this collection contains no elements.

Usage

From source file:eu.ggnet.dwoss.misc.op.listings.FtpTransfer.java

private static void deleteFilesByType(FTPClient ftp, Collection<String> fileTypesToDelete) throws IOException {
    if (fileTypesToDelete == null || fileTypesToDelete.isEmpty())
        return;//from  w  w w .  j  av a2 s  .c o m
    FTPFile[] existingFiles = ftp.listFiles();
    if (existingFiles == null || existingFiles.length == 0)
        return;
    for (String type : fileTypesToDelete) {
        for (FTPFile ftpFile : existingFiles) {
            if (ftpFile == null)
                continue;
            if (ftpFile.getName().toLowerCase().endsWith(type)) {
                if (!ftp.deleteFile(ftpFile.getName())) {
                    throw new IOException("Could not delete " + ftpFile.getName());
                }
            }
        }
    }
}

From source file:net.cloudkit.enterprises.infrastructure.utilities.Collections3Utility.java

/**
 * ?.//from w  w  w .j  av  a2 s  .  co  m
 */
public static boolean isNotEmpty(Collection<?> collection) {
    return ((collection != null) && !(collection.isEmpty()));
}

From source file:ips1ap101.lib.base.util.ColUtils.java

public static <T> Collection<T> sort(Collection<T> collection, Comparator<T> comparator) {
    if (collection instanceof List && !collection.isEmpty() && comparator != null) {
        List<T> list = (List<T>) collection;
        //          Collections.sort(list, comparator);
        wolfgangFahlSort(list, comparator);
    }//from  ww  w . j  a va  2s  .co m
    return collection;
}

From source file:net.dontdrinkandroot.utils.collections.CollectionUtils.java

public static <T extends Number> AggregationResult aggregate(final Collection<T> collection) {

    if (collection.isEmpty()) {
        throw new IllegalArgumentException("Collection must not be empty");
    }/*from w  w w .j  a  v a  2s .  c  om*/

    final AggregationResult result = new AggregationResult();
    result.setSize(collection.size());
    double sum = 0;
    double min = Double.MAX_VALUE;
    double max = Double.MIN_VALUE;

    /* Determine min, max, sum */
    for (final T entry : collection) {
        if (entry != null) {
            final double value = entry.doubleValue();
            max = Math.max(max, value);
            min = Math.min(min, value);
            sum += value;
        }
    }
    result.setMin(min);
    result.setMax(max);
    result.setSum(sum);

    result.setAvg(sum / result.getSize());

    result.setMean(CollectionUtils.getMean(collection));

    return result;
}

From source file:cc.sion.core.utils.Collections3.java

/**
 * ?./* ww w  . j a v a 2  s .  co  m*/
 */
public static boolean isEmpty(Collection collection) {
    return (collection == null) || collection.isEmpty();
}

From source file:com.cnksi.core.tools.utils.Collections3.java

/**
 * ?.//w  w  w  . j  a  v a  2 s . c om
 */
public static boolean isEmpty(Collection collection) {

    return (collection == null || collection.isEmpty());
}

From source file:cc.sion.core.utils.Collections3.java

/**
 * ?./*from   ww  w  .  j  a v  a2 s.  co m*/
 */
public static boolean isNotEmpty(Collection collection) {
    return (collection != null) && !(collection.isEmpty());
}

From source file:org.cloudfoundry.maven.common.CommonUtils.java

/**
 * Convert a List of CloudServices to a comma delimited String using their names.
 *
 * @param list//w  w w.  j a va  2s. co m
 * @return Returns the List as a comma delimited String. Returns an empty
 *         String for a Null or empty list.
 */
public static String collectionServicesToCommaDelimitedString(Collection<? extends CloudService> list) {
    if (list == null || list.isEmpty()) {
        return "";
    }

    List<String> sb = new ArrayList<String>();

    for (CloudService service : list) {
        sb.add(service.getName());
    }

    return sb.toString();
}

From source file:com.cnksi.core.tools.utils.Collections3.java

/**
 * ?./*from w  w w  . ja  va  2s .  c  o  m*/
 */
public static boolean isNotEmpty(Collection collection) {

    return (collection != null && !(collection.isEmpty()));
}

From source file:ips1ap101.lib.base.util.ColUtils.java

@SuppressWarnings("unchecked") // unchecked cast
public static <T> Collection<T> sort(Collection<T> collection, Comparator<T>... comparators) {
    if (collection instanceof List && !collection.isEmpty() && comparators != null) {
        List<T> list = (List<T>) collection;
        Comparator<T> comparator = (Comparator<T>) ComparatorUtils.chainedComparator(comparators); // unchecked cast
        //          Collections.sort(list, comparator);
        wolfgangFahlSort(list, comparator);
    }// ww w.  j  a  v  a 2  s.c  o  m
    return collection;
}