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:com.flexive.shared.cmis.search.CmisResultValue.java

@SuppressWarnings({ "unchecked" })
private static CmisResultValue createListValue(Object value) {
    final Collection list = (Collection) value;
    return list.isEmpty() ? new NullResult() : new MultivaluedResult(list);
}

From source file:de.thischwa.pmcms.tool.file.FileTool.java

/**
 * Just a wrapper to {@link #copyToDirectoryUnique(File, File)}.
 * //  w w  w.j a  v a 2s.  c o m
 * @param filesToCopy
 * @param directory
 * @return Collection of the copied files.
 * @throws IOException
 */
public static List<File> copyToDirectoryUnique(final Collection<File> filesToCopy, final File directory)
        throws IOException {
    if (filesToCopy.isEmpty())
        return null;
    List<File> copiedFiles = new ArrayList<File>(filesToCopy.size());
    for (File srcFile : filesToCopy)
        copiedFiles.add(copyToDirectoryUnique(srcFile, directory));
    return copiedFiles;
}

From source file:Main.java

/**
 * Make the log more meanings//from   ww  w .j a  v a 2  s .  c  om
 * 
 * @param <E>
 * @param collec
 * @return
 */
public static <E> String toLog(String separator, Collection<E> collec) {
    // using StringBuffer instead of String because expect there are many append operation
    StringBuffer sb = new StringBuffer();

    if (collec == null) {
        return null;
    }
    if (collec.isEmpty()) {
        return collec.toString();
    }
    sb.append("[");
    for (Iterator<E> iterator = collec.iterator(); iterator.hasNext();) {
        E value = iterator.next();
        sb.append(separator).append(toString4Log(value)).append(separator);
        if (iterator.hasNext()) {
            sb.append(", ");
        }
    }

    sb.append("]");
    return sb.toString();
}

From source file:com.baifendian.swordfish.common.mail.MailSendUtil.java

/**
 * ??//from   www.  j  av  a  2  s.co m
 *
 * @param receivers
 * @param title
 * @param content
 * @return
 */
public static boolean sendMails(Collection<String> receivers, String title, String content) {
    if (receivers == null) {
        LOGGER.error("Mail receivers is null.");
        return false;
    }

    receivers.removeIf((from) -> (StringUtils.isEmpty(from)));

    if (receivers.isEmpty()) {
        LOGGER.error("Mail receivers is empty.");
        return false;
    }

    // ?? email
    HtmlEmail email = new HtmlEmail();

    try {
        //  SMTP ?????, 163 "smtp.163.com"
        email.setHostName(mailServerHost);

        email.setSmtpPort(mailServerPort);

        // ?
        email.setCharset("UTF-8");
        // 
        for (String receiver : receivers) {
            email.addTo(receiver);
        }
        // ??
        email.setFrom(mailSender, mailSender);
        // ???????-??????
        email.setAuthentication(mailSender, mailPasswd);
        // ???
        email.setSubject(title);
        // ???? HtmlEmail? HTML 
        email.setMsg(content);
        // ??
        email.send();

        return true;
    } catch (Throwable e) {
        LOGGER.error("Send email to {} failed", StringUtils.join(",", receivers), e);
    }

    return false;
}

From source file:ca.simplegames.micro.utils.UrlResource.java

/**
 * Convenience method to return a Collection as a delimited (e.g. CSV)
 * String. E.g. useful for <code>toString()</code> implementations.
 *
 * @param coll   the Collection to display
 * @param delim  the delimiter to use (probably a ",")
 * @param prefix the String to start each element with
 * @param suffix the String to end each element with
 * @return the delimited String/*from w w  w .  j a  va  2  s . com*/
 */
public static String collectionToDelimitedString(Collection coll, String delim, String prefix, String suffix) {
    if (coll == null || coll.isEmpty()) {
        return "";
    }
    StringBuffer sb = new StringBuffer();
    Iterator it = coll.iterator();
    while (it.hasNext()) {
        sb.append(prefix).append(it.next()).append(suffix);
        if (it.hasNext()) {
            sb.append(delim);
        }
    }
    return sb.toString();
}

From source file:com.github.drbookings.ui.controller.UpcomingController.java

private static void addCleaningSummary(final LocalDate date, final VBox box,
        final Collection<CleaningEntry> upcomingBookings) {
    final TextFlow tf = new TextFlow();
    if (upcomingBookings.isEmpty()) {
        // final Text t0 = new Text("and no cleaning.");
        // tf.getChildren().add(t0);
    } else {/*www. j  a  v  a2  s.co  m*/
        final Text t0 = new Text("and ");
        final Text t1 = new Text(upcomingBookings.size() + " ");
        t1.getStyleClass().add("emphasis");
        final Text t2 = new Text(" cleaning" + (upcomingBookings.size() > 1 ? "s." : "."));
        t2.getStyleClass().add("emphasis");
        tf.getChildren().addAll(t0, t1, t2);
    }
    box.getChildren().add(tf);

}

From source file:net.kamhon.ieagle.util.CollectionUtil.java

/**
 * true if collection is not null and not empty.
 * /* w w  w  .  j  av a2s .  c om*/
 * @param collection
 * @return
 */
public static boolean isNotEmpty(Collection<?> collection) {
    return collection != null && !collection.isEmpty();
}

From source file:edu.uci.ics.hyracks.algebricks.rewriter.rules.PushProjectDownRule.java

private static boolean pushAllProjectionsOnTopOf(Collection<LogicalVariable> toPush,
        Mutable<ILogicalOperator> opRef, IOptimizationContext context, ILogicalOperator initialOp)
        throws AlgebricksException {
    if (toPush.isEmpty()) {
        return false;
    }//w  ww. jav  a2 s  .co m
    AbstractLogicalOperator op = (AbstractLogicalOperator) opRef.getValue();

    if (context.checkAndAddToAlreadyCompared(initialOp, op)) {
        return false;
    }

    switch (op.getOperatorTag()) {
    case EXCHANGE: {
        opRef = opRef.getValue().getInputs().get(0);
        op = (AbstractLogicalOperator) opRef.getValue();
        break;
    }
    case PROJECT: {
        return false;
    }
    }

    ProjectOperator pi2 = new ProjectOperator(new ArrayList<LogicalVariable>(toPush));
    pi2.getInputs().add(new MutableObject<ILogicalOperator>(op));
    opRef.setValue(pi2);
    pi2.setExecutionMode(op.getExecutionMode());
    context.computeAndSetTypeEnvironmentForOperator(pi2);
    return true;
}

From source file:com.kingen.web.CommonController.java

public static String serializeOnlyGivenFields(Object o, Collection<String> fields)
        throws JsonProcessingException {
    if ((fields == null) || fields.isEmpty())
        fields = new HashSet<String>();

    Set<String> properties = new HashSet<String>(fields);

    SimpleBeanPropertyFilter filter = new SimpleBeanPropertyFilter.FilterExceptFilter(properties);
    SimpleFilterProvider fProvider = new SimpleFilterProvider();
    fProvider.addFilter(FILTER_NAME, filter);

    ObjectMapper mapper = new ObjectMapper();
    mapper.setAnnotationIntrospector(new AnnotationIntrospector());

    String json = mapper.writer(fProvider).writeValueAsString(o);
    return json;/*from   w  ww . j  a v  a  2s  .  c  o  m*/
}

From source file:com.nextep.datadesigner.sqlgen.impl.GeneratorFactory.java

/**
 * Retrieves the correct SQL generator which is able to generate the specified model object in
 * SQL.//w w w  .java 2 s .  c om
 * 
 * @param type type of the item to generate
 * @return the appropriate generator
 */
public static ISQLGenerator getGenerator(IElementType type, DBVendor vendor) {
    // Loading extensiongs
    Collection<IConfigurationElement> conf = Designer.getInstance().getExtensions(GENERATOR_EXTENSION_ID,
            "sqlGenerator", "typeId", type.getId()); //$NON-NLS-1$ //$NON-NLS-2$
    if (conf == null || conf.isEmpty()) {
        LOGGER.debug("No generator found for type <" + type.getId() + ">, will not generate.");
        // throw new ErrorException("No generator found for type <" + type.getId() + ">");
        return new NullGenerator();
    } else {
        try {
            ISQLGenerator generator = null;
            // First looking for vendor-specific generator
            for (IConfigurationElement elt : conf) {
                final String extensionVendor = elt.getAttribute(ATTR_VENDOR);
                if (vendor.name().equals(extensionVendor)) {
                    generator = (ISQLGenerator) elt.createExecutableExtension("class"); //$NON-NLS-1$
                    generator.setVendor(vendor);
                    return generator;
                }
            }
            // Falling back here if no vendor specific extension found, looking for generic
            // support
            for (IConfigurationElement elt : conf) {
                final String extensionVendor = elt.getAttribute(ATTR_VENDOR);
                if (extensionVendor == null || "".equals(extensionVendor)) { //$NON-NLS-1$
                    generator = (ISQLGenerator) elt.createExecutableExtension("class"); //$NON-NLS-1$
                    generator.setVendor(vendor);
                }
            }

            // If we do not have a vendor-specific generator BUT we have a generic generator, we
            // use it
            if (generator != null) {
                return generator;
            } else {
                // We fall here if we have no generator for the current vendor AND no generic
                // generator
                LOGGER.info("No generator found for type <" + type.getId() + "> and vendor " + vendor.toString()
                        + ", will not generate.");
                return new NullGenerator();
            }
        } catch (CoreException e) {
            LOGGER.error("Error while instantiating generator for type <" + type.getId() + ">"); //$NON-NLS-2$
            throw new ErrorException(e);
        }
    }
}