Example usage for java.util Collections emptyMap

Introduction

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

Prototype

@SuppressWarnings("unchecked")
public static final <K, V> Map<K, V> emptyMap()

Source Link

Document

Returns an empty map (immutable).

Usage

From source file:Main.java

/**
 * Creates an unmodifiable shallow copy of the given original {@link Map}. <p> While the copy returns an immutable
 * copy of the {@link Map} the content is not cloned in any way. Unless the content is immutable by itself the
 * result is not fully immutable. In the shallow copy all references are the same as in the original {@link Map}!
 * </p>/*from www .ja  v  a  2  s .  co  m*/
 *
 * @param original The {@link Map} to copy the elements fro.
 * @param <K>      The type of the key
 * @param <V>      The type of the value
 *
 * @return Returns an immutable (unmodifiable) copy of the original {@link Map} with all the elements added but not
 * cloned!
 */
public static <K, V> Map<K, V> createUnmodifiableShallowCopy(final Map<K, V> original) {
    if (original == null || original.isEmpty()) {
        return Collections.emptyMap();
    } else {
        return Collections.unmodifiableMap(new HashMap<K, V>(original));
    }
}

From source file:com.qwazr.cluster.service.ClusterServiceStatusJson.java

public ClusterServiceStatusJson() {
    this(StringUtils.EMPTY, ArrayUtils.EMPTY_STRING_ARRAY, Collections.emptyMap());
}

From source file:edu.jhuapl.graphs.jfreechart.PieEffectsTest.java

public static JFreeChartGraphSource getSource() throws GraphException {
    Map<String, Object> emptyMap = Collections.emptyMap();

    List<PointInterface> ps1 = new LinkedList<PointInterface>();

    Map<String, Object> params = new HashMap<String, Object>(1);
    params.put(GraphSource.ITEM_COLOR, Color.red);
    ps1.add(new DataPoint(3, "Red", params));

    params = new HashMap<String, Object>(1);
    params.put(GraphSource.ITEM_COLOR, Color.green);
    ps1.add(new DataPoint(5, "Green", params));

    params = new HashMap<String, Object>(1);
    params.put(GraphSource.ITEM_COLOR, Color.blue);
    ps1.add(new DataPoint(7, "Blue", params));

    DataSeries s1 = new DataSeries(ps1, emptyMap);

    Map<String, Object> graphParams = new HashMap<String, Object>();
    graphParams.put(GraphSource.GRAPH_TYPE, GraphSource.GRAPH_TYPE_PIE);
    graphParams.put(GraphSource.GRAPH_LEGEND, true);

    JFreeChartGraphSource source = new JFreeChartGraphSource();
    source.setData(Arrays.asList(s1));
    source.setParams(graphParams);/*from ww w.j ava  2  s .  co  m*/
    source.initialize();

    return source;
}

From source file:com.inspiresoftware.lib.dto.geda.interceptor.impl.TransferableUtils.java

/**
 * Work out configurations from {@link com.inspiresoftware.lib.dto.geda.annotations.Transferable}
 *
 * @param method method examined./* w w  w .j  a  v  a2  s  .c  o  m*/
 * @param targetClass class upon which this method was invoked
 * @return configuration.
 */
public static Map<Occurrence, AdviceConfig> resolveConfiguration(final Method method,
        final Class<?> targetClass) {

    if (GeDAInfrastructure.class.isAssignableFrom(targetClass) || Adapter.class.isAssignableFrom(targetClass)) {
        return Collections.emptyMap();
    }
    return resolveConfiguration(method, targetClass, true);
}

From source file:org.apache.droids.protocol.http.NoAuthHandler.java

@Override
public Map<String, Header> getChallenges(HttpResponse response, HttpContext context)
        throws MalformedChallengeException {
    return Collections.emptyMap();
}

From source file:Main.java

/**
 * This method returns a new HashMap which is the intersection of the two Map parameters, based on {@link Object#equals(Object) equality}
 * of their entries.//ww w .  ja v a2s .co  m
 * Any references in the resultant map will be to elements within map1.
 * 
 * @return a new HashMap whose values represent the intersection of the two Maps.
 */
public static <K, V> Map<K, V> intersect(Map<K, V> map1, Map<K, V> map2) {
    if (map1 == null || map1.isEmpty() || map2 == null || map2.isEmpty()) {
        return Collections.emptyMap();
    }

    // We now know neither map is null.
    Map<K, V> result = new HashMap<K, V>();
    for (Map.Entry<K, V> item : map1.entrySet()) {
        V value = map2.get(item.getKey());
        if (value != null && value.equals(item.getValue())) {
            result.put(item.getKey(), item.getValue());
        }
    }

    return result;
}

From source file:pl.edu.agh.samm.db.impl.AbstractDao.java

/**
 * Gets last id of insert statement. Method using that <b>must be annotated
 * with {@link Transactional} with propagation set to at least SUPPORTS</b>
 * //www  .  java2s .  c om
 * @return
 */
protected Integer getLastId() {
    Map<String, Object> emptyMap = Collections.emptyMap();
    return simpleJdbcTemplate.queryForInt(SQL_IDENTITY, emptyMap);
}

From source file:edu.jhuapl.graphs.jfreechart.BarEffectsTest.java

public static JFreeChartGraphSource getSource() throws GraphException {
    Map<String, Object> emptyMap = Collections.emptyMap();

    List<PointInterface> ps1 = new LinkedList<PointInterface>();
    ps1.add(new DataPoint(3, "Red", emptyMap));
    ps1.add(new DataPoint(5, "Green", emptyMap));
    ps1.add(new DataPoint(7, "Blue", emptyMap));

    Map<String, Object> s1Meta = new HashMap<String, Object>();
    s1Meta.put(GraphSource.SERIES_COLOR, Color.green);
    DataSeries s1 = new DataSeries(ps1, s1Meta);

    List<PointInterface> ps2 = new LinkedList<PointInterface>();

    Map<String, Object> redMap = new HashMap<String, Object>(1);
    redMap.put(GraphSource.ITEM_COLOR, Color.red);
    ps2.add(new DataPoint(5, "Red", redMap));

    Map<String, Object> greenMap = new HashMap<String, Object>(1);
    greenMap.put(GraphSource.ITEM_COLOR, Color.green);
    ps2.add(new DataPoint(2, "Green", greenMap));

    Map<String, Object> blueMap = new HashMap<String, Object>(1);
    blueMap.put(GraphSource.ITEM_COLOR, Color.blue);
    ps2.add(new DataPoint(14, "Blue", redMap));

    Map<String, Object> s2Meta = new HashMap<String, Object>();
    s2Meta.put(GraphSource.SERIES_COLOR, Color.orange);
    DataSeries s2 = new DataSeries(ps2, s2Meta);

    Map<String, Object> graphParams = new HashMap<String, Object>();
    graphParams.put(GraphSource.GRAPH_TYPE, GraphSource.GRAPH_TYPE_BAR);
    graphParams.put(JFreeChartBarGraphSource.PLOT_ORIENTATION, PlotOrientation.HORIZONTAL);
    graphParams.put(GraphSource.GRAPH_LEGEND, true);

    JFreeChartGraphSource source = new JFreeChartGraphSource();
    source.setData(Arrays.asList(s1, s2));
    source.setParams(graphParams);//from   w w  w . ja  v a2  s .  co  m
    source.initialize();

    return source;
}

From source file:io.hops.hopsworks.api.zeppelin.rest.message.NotebookRepoSettingsRequest.java

public NotebookRepoSettingsRequest() {
    name = StringUtils.EMPTY;
    settings = Collections.emptyMap();
}

From source file:de.micromata.genome.gwiki.page.impl.wiki.parser.WikiParserUtils.java

public static List<GWikiFragment> parseText(String wikiText) {
    Map<String, GWikiMacroFactory> macroFactories = Collections.emptyMap();
    return parseText(wikiText, macroFactories);
}