Example usage for java.util Collections singleton

Introduction

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

Prototype

public static <T> Set<T> singleton(T o)

Source Link

Document

Returns an immutable set containing only the specified object.

Usage

From source file:Main.java

public static <E extends Object> void removeNullFromList(List<E> list) {
    list.removeAll(Collections.singleton(null));
}

From source file:Main.java

public static Set getSet(Object... objs) {
    if (objs.length == 0) {
        return Collections.emptySet();
    } else if (objs.length == 1) {
        return Collections.singleton(objs[0]);
    } else {/*from  w  w  w .j  a v  a2  s.com*/
        return new HashSet(Arrays.asList(objs));
    }

}

From source file:Main.java

public static <E> Set<E> asSet(E... elements) {
    if (elements == null || elements.length == 0) {
        return Collections.emptySet();
    }//w w  w.jav a2s . c o  m

    if (elements.length == 1) {
        return Collections.singleton(elements[0]);
    }

    LinkedHashSet<E> set = new LinkedHashSet<E>(elements.length * 4 / 3 + 1);
    Collections.addAll(set, elements);
    return set;
}

From source file:com.vmware.identity.openidconnect.common.ResponseType.java

public static ResponseType authorizationCode() {
    return new ResponseType(Collections.singleton(ResponseTypeValue.AUTHORIZATION_CODE));
}

From source file:Main.java

/**
 * Convert a char array to a unmodifiable Set.
 *
 * @param array the contents of the new Set
 * @return a unmodifiable Set containing the elements in the array.
 *///from   www  .  j  a v a2 s  . c  om
public static Set<Character> arrayToUnmodifiableSet(char... array) {
    if (array == null) {
        return Collections.emptySet();
    }
    if (array.length == 1) {
        return Collections.singleton(array[0]);
    }
    return Collections.unmodifiableSet(arrayToSet(array));
}

From source file:Main.java

/**
 * Convert a String to a unmodifiable set of characters.
 *
 * @param str The string to convert/*from   w  ww  . j a  v a2s. co  m*/
 * @return A set containing the characters in str. A empty set is returned if str is null.
 */
public static Set<Character> strToUnmodifiableSet(String str) {
    if (str == null) {
        return Collections.emptySet();
    }
    if (str.length() == 1) {
        return Collections.singleton(str.charAt(0));
    }
    return Collections.unmodifiableSet(strToSet(str));
}

From source file:cc.kave.commons.model.groum.SubGroum.java

public static SubGroumMultiSet getAtomicSubGroums(Groum groum) {
    SubGroumMultiSet atomics = new SubGroumMultiSet();
    for (Node node : groum.getAllNodes()) {
        Set<Node> nodes = Collections.singleton(node);
        SubGroum subGroum = new SubGroum(groum, nodes);
        atomics.add(subGroum);//from   www .  j av a2  s. c  o  m
    }
    return atomics;
}

From source file:com.vmware.identity.openidconnect.common.ResponseType.java

public static ResponseType idToken() {
    return new ResponseType(Collections.singleton(ResponseTypeValue.ID_TOKEN));
}

From source file:com.mirth.connect.donkey.server.data.ChannelDoesNotExistException.java

public ChannelDoesNotExistException(String channelId) {
    this(Collections.singleton(channelId));
}

From source file:com.hubrick.raml.mojo.util.RamlUtil.java

public static String toJavaMethodName(Action action) {
    final List<String> nameElements = stream(spliterator(action.getResource().getUri().split("\\/")), false)
            .filter(path -> !path.matches(".*\\{[^\\}]*\\}.*"))
            .map(path -> stream(spliterator(path.split("(?i:[^a-z0-9])")), false).map(StringUtils::capitalize)
                    .collect(toList()))//from  ww w . j a  va  2  s . c  o m
            .flatMap(tokens -> tokens.stream()).collect(toList());

    return Joiner.on("")
            .join(Iterables.concat(Collections.singleton(action.getType().name().toLowerCase()), nameElements));
}