com.sun.faces.util.CollectionsUtils Maven / Gradle / Ivy
/*
* Copyright (c) 1997, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package com.sun.faces.util;
import static java.util.Arrays.asList;
import static java.util.Collections.unmodifiableMap;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* @author [email protected]
*
*/
public class CollectionsUtils {
private CollectionsUtils() {
// this class contains static methods only.
}
@SafeVarargs
public static Set asSet(T... a) {
return new HashSet<>(asList(a));
}
public static T[] ar(T... ts) {
return ts;
}
public static T[] ar() {
return null;
}
public static ConstMap map() {
return new ConstMap<>();
}
public static class ConstMap extends HashMap {
private static final long serialVersionUID = 7233295794116070299L;
public ConstMap() {
super(50, 1.0F);
}
public ConstMap add(T key, V value) {
put(key, value);
return this;
}
public Map fix() {
return unmodifiableMap(this);
}
}
}