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EE4J Compatible Implementation for Jakarta Faces API

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/*
 * Copyright (c) 1997, 2018 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 java.util.Collections;
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<>();
	}
	
	@SuppressWarnings("serial")
	public static class ConstMap extends HashMap {
		
		public ConstMap() {
			super(50, 1.0F);
		}
		
		public ConstMap add(T key, V value) {
			put(key, value);
			return this;
		}
		
		public Map fix() {
			return Collections.unmodifiableMap(this);
		}
	}
}