Example usage for java.util Collections unmodifiableSet

Introduction

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

Prototype

public static <T> Set<T> unmodifiableSet(Set<? extends T> s)

Source Link

Document

Returns an unmodifiable view of the specified set.

Usage

From source file:Main.java

/**
 * Creates an unmodifiable set filled with the given values.
 * /*  w ww  .  jav a 2 s. c  om*/
 * @param <T>
 *            the set's element type.
 * @param values
 *            the values.
 * @return a newly created set containing the given values.
 */
@SafeVarargs
public static <T> Set<T> createUnmodifiableSet(final T... values) {
    switch (values.length) {
    case 0:
        return Collections.emptySet();
    case 1:
        return Collections.singleton(values[0]);
    default:
        return Collections.unmodifiableSet(createHashSet(values));
    }
}

From source file:Main.java

/**
 * @return an <b>UNMODIFIABLE</b> Set&lt;T&gt;
 *//* w ww . j a v  a  2s. c  om*/
public static <T> Set<T> unmodifiableSet(final Set<? extends T> s) {
    return (s == null) ? Collections.<T>emptySet() : Collections.unmodifiableSet(s);
}

From source file:Main.java

public static Set<String> getProperties() {
    return Collections.unmodifiableSet(properties);
}

From source file:Main.java

public static <T> Set<T> nonNullFrom(Set<T> set) {
    if (set == null || set.isEmpty()) {
        return Collections.emptySet();
    }/* w  ww  . j  a  va2 s .co  m*/
    return Collections.unmodifiableSet(set);
}

From source file:Main.java

/**
 * Returns an unmodifiable set containing the given elements.
 *
 * @param ts the elements from which to create a set
 * @param <T> the type of the element in the set
 * @return an unmodifiable set containing the given elements or {@code null} in case the given element array is
 * {@code null}.//  w  w  w. jav a 2s  . com
 */
public static <T> Set<T> asSet(T... ts) {
    if (ts == null) {
        return null;
    } else if (ts.length == 0) {
        return Collections.emptySet();
    } else {
        Set<T> set = new HashSet<T>(ts.length);
        Collections.addAll(set, ts);
        return Collections.unmodifiableSet(set);
    }
}

From source file:Main.java

private static Set<String> getQueryParameterNames(Uri uri) {
    if (uri.isOpaque()) {
        throw new UnsupportedOperationException("This isn't a hierarchical URI.");
    }/*from  ww  w  .  j  ava 2  s  . co  m*/

    String query = uri.getEncodedQuery();
    if (query == null) {
        return Collections.emptySet();
    }

    Set<String> names = new LinkedHashSet<String>();
    int start = 0;
    do {
        int next = query.indexOf('&', start);
        int end = (next == -1) ? query.length() : next;

        int separator = query.indexOf('=', start);
        if (separator > end || separator == -1) {
            separator = end;
        }

        String name = query.substring(start, separator);
        names.add(Uri.decode(name));

        // Move start to end of name.
        start = end + 1;
    } while (start < query.length());

    return Collections.unmodifiableSet(names);
}

From source file:Main.java

public static Set<String> getQueryParameterNames(Uri uri) {
    if (uri.isOpaque()) {
        throw new UnsupportedOperationException("This isn't a hierarchical URI.");
    }//from w ww  . java  2  s .c  om

    String query = uri.getEncodedQuery();
    if (query == null) {
        return Collections.emptySet();
    }

    Set<String> names = new LinkedHashSet<String>();
    int start = 0;
    do {
        int next = query.indexOf('&', start);
        int end = next == -1 ? query.length() : next;

        int separator = query.indexOf('=', start);
        if (separator > end || separator == -1) {
            separator = end;
        }

        String name = query.substring(start, separator);
        names.add(Uri.decode(name));

        // Move start to end of name.
        start = end + 1;
    } while (start < query.length());

    return Collections.unmodifiableSet(names);
}

From source file:DataSet.java

public DataSet(final String name, final Integer... seasons) {
    this.name = name;
    this.data = Collections.unmodifiableSet(new TreeSet<>(Arrays.asList(seasons)));
}

From source file:Main.java

/**
 * @param <T>      the element type
 * @param elements the elements//  w w w  .j  av a  2 s  .  com
 *
 * @return an <b>UNMODIFIABLE</b> Set&lt;T&gt;
 */
@SafeVarargs
@SuppressWarnings("varargs")
public static <T> Set<T> set(T... elements) {
    return Collections.unmodifiableSet(new HashSet<>(Arrays.asList(elements)));
}

From source file:Main.java

/**
 * Returns an unmodifiable view of the specified {@code mapSet}. This
 *  method allows modules to provide users with "read-only" access to
 * {@link Map}, but also to the value {@link Set}.
 *
 * @param <K>//from  ww w.j  ava  2 s  .  c o m
 *            the class of the map keys
 * @param <V>
 *            the class of the set values
 * @param mapSet
 *            the {@link Map} of {@link Set} for which an unmodifiable view
 *            is to be returned
 * @return an unmodifiable view of the specified map.
 *
 * @see Collections#unmodifiableMap(Map)
 * @see Collections#unmodifiableSet(Set)
 * @since 4.2
 */
@Nonnull
public static <K, V> Map<K, Set<V>> unmodifiableMapSet(@Nullable final Map<K, Set<V>> mapSet) {
    if (mapSet == null) {
        return Collections.emptyMap();
    }

    for (final Map.Entry<K, Set<V>> entry : mapSet.entrySet()) {
        final K key = entry.getKey();
        final Set<V> value = entry.getValue();

        mapSet.replace(key, Collections.unmodifiableSet(value));
    }

    return Collections.unmodifiableMap(mapSet);
}