Example usage for java.util List isEmpty

Introduction

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

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this list contains no elements.

Usage

From source file:Main.java

public static <T> boolean retainAllByValue(Collection<T> c1, Collection<? extends T> c2) {
    if (c1 == null || c2 == null || c1.isEmpty() || c2.isEmpty())
        return false;
    List<T> itemsToRemove = new ArrayList<T>();
    for (T item : c1) {
        if (!containsByValue(c2, item))
            itemsToRemove.add(item);/* w w  w .  ja v a 2s.  co  m*/
    }
    c1.removeAll(itemsToRemove);
    return (!itemsToRemove.isEmpty());
}

From source file:com.comphenix.xp.parser.Utility.java

public static String formatBoolean(String booleanName, List<Boolean> value) {
    // Mirror the query syntax
    if (value == null || value.isEmpty() || value.contains(null))
        return "";
    else//w  ww.  j  av  a  2 s . c om
        return value.get(0) ? booleanName : "!" + booleanName;
}

From source file:com.qubit.solution.fenixedu.integration.cgd.webservices.messages.CgdMessageUtils.java

public static Person readPersonByMemberCode(String populationCode, String memberCode) {
    Person requestedPerson = null;/*from w w w  . j a va  2  s .  c  o m*/
    if (!StringUtils.isEmpty(memberCode) && !StringUtils.isEmpty(populationCode)) {
        switch (populationCode.charAt(0)) {
        case 'A':
            Student student = null;

            try {
                int number = Integer.parseInt(memberCode);
                student = Student.readStudentByNumber(number);
            } catch (Exception e) {
                logger.warn(String.format("Invalid student number: [%s]", memberCode));
            }

            if (student != null) {
                requestedPerson = student.getPerson();
            }
        case 'E':
            // NOT YET IMPLEMENTED
            break;
        case 'D':
            List<Teacher> readByNumbers = Teacher.readByNumbers(Collections.singleton(memberCode));
            Teacher teacher = readByNumbers.isEmpty() ? null : readByNumbers.iterator().next();
            if (teacher != null) {
                requestedPerson = teacher.getPerson();
            }
        }
    }
    return requestedPerson;
}

From source file:com.jeklsoft.cassandraclient.hector.HectorTest.java

public static me.prettyprint.hector.api.Keyspace configureHectorAccessToCassandra(String cassandraHostname,
        Integer cassandraPort, String cassandraClusterName, String cassandraKeySpaceName,
        String configurationPath, List<String> cassandraCommands) throws Exception {

    try {/* www  .  j av  a2 s . c o m*/
        if (StringUtils.isNotEmpty(configurationPath) && (cassandraCommands != null)
                && (!cassandraCommands.isEmpty())) {
            URL stream = HectorTest.class.getClassLoader().getResource("cassandra.yaml");
            File cassandraYaml = new File(stream.toURI());

            EmbeddedCassandra.builder().withCleanDataStore().withStartupCommands(cassandraCommands)
                    .withHostname(cassandraHostname).withHostport(cassandraPort)
                    .withCassandaConfigurationDirectoryPath(configurationPath)
                    .withCassandaYamlFile(cassandraYaml).build();
        }

        CassandraHostConfigurator configurator = new CassandraHostConfigurator(
                cassandraHostname + ":" + cassandraPort);
        Cluster cluster = HFactory.getOrCreateCluster(cassandraClusterName, configurator);
        me.prettyprint.hector.api.Keyspace keyspace = HFactory.createKeyspace(cassandraKeySpaceName, cluster);
        return keyspace;
    } catch (Exception e) {
        throw new RuntimeException("Error configuring access", e);
    }
}

From source file:json.YetiJson.java

@SuppressWarnings("rawtypes")
static private AList convertList(AList expected, List value) {
    if (value.isEmpty()) {
        return null;
    }/*www .j  a v a  2  s  .com*/

    MList result = new MList();
    result.reserve(value.size());
    for (Object item : value) {
        result.add(convertValue(expected.first(), item));
    }
    return result;
}

From source file:json.YetiJson.java

@SuppressWarnings("rawtypes")
static private AList convertList(List value) {
    if (value.isEmpty()) {
        return null;
    }//from www . j  ava 2 s  . com

    MList result = new MList();
    result.reserve(value.size());
    for (Object item : value) {
        result.add(convertValue(item));
    }
    return result;
}

From source file:net.sourceforge.fenixedu.util.InquiriesUtil.java

/**
 * @return Returns the list containing with only the first occurrence of the
 *         elementes based on the equals method the result list is ordered
 *         by the externalId//from w w  w .  j a  v  a2s.  co  m
 */
public static void removeDuplicates(final List beanList) {
    if (beanList.isEmpty()) {
        return;
    }

    Collections.sort(beanList, new BeanComparator("externalId"));

    final Iterator iter = beanList.iterator();
    InfoObject prev = (InfoObject) iter.next();
    while (iter.hasNext()) {
        final InfoObject curr = (InfoObject) iter.next();
        if (curr.equals(prev)) {
            iter.remove();
        }
        prev = curr;
    }
}

From source file:Main.java

public static <T> List<T> unmodifiableList(final List<? extends T> l, final boolean newList,
        final boolean emptyAsNull) {
    if (l == null) {
        return null;
    }//w  w w . j  av a  2 s .  c  o  m

    if (emptyAsNull && l.isEmpty()) {
        return null;
    }

    return Collections.unmodifiableList(newList ? new ArrayList<>(l) : l);
}

From source file:Main.java

/**
 * This method joins two lists returning the a single list consisting of the first followed by the second.
 * //from  w  w  w  .  ja va2 s  .com
 * @param first  first list. can be null.
 * @param second second list. can be null.
 * @param emptyResultIsNull if the result is empty, should we return null?
 * @return the concatenation of both lists or null
 */
public static <T> List<T> nullSafeAppend(List<T> first, List<T> second, boolean emptyResultIsNull) {
    List<T> result = new ArrayList<T>();

    if (first != null)
        result.addAll(first);
    if (second != null)
        result.addAll(second);

    if (result.isEmpty() && emptyResultIsNull) {
        result = null;
    }
    return result;
}

From source file:de.tor.tribes.util.xml.JDomUtils.java

/** Get the value of the first available node.
 * @return the value of the first available node
 *//*from  w  w w.j  av  a 2 s . co m*/
public static String getNodeValue(Element element, String path) {
    List list;
    String getNodeValue;

    list = getList(element, path);
    if (list.isEmpty()) {
        getNodeValue = null;
    } else {
        getNodeValue = ((Element) list.get(0)).getTextTrim();
    }
    return getNodeValue;
}