Sets.java Source code

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Here is the source code for Sets.java

Source

/**
 * Copyright (C) 2007 Google Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
    
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
    
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

/**
 * Helper methods related to {@link Set}s.
 *
 * @author maxr@google.com (Max Ross)
 */
public class Sets {
    private Sets() {
    }

    /**
     * Construct a new {@link HashSet}, taking advantage of type inference to
     * avoid specifying the type on the rhs.
     */
    public static <E> HashSet<E> newHashSet() {
        return new HashSet<E>();
    }

    /**
     * Construct a new {@link HashSet} with the provided elements, taking advantage of type inference to
     * avoid specifying the type on the rhs.
     */
    public static <E> HashSet<E> newHashSet(E... elements) {
        HashSet<E> set = newHashSet();
        Collections.addAll(set, elements);
        return set;
    }

    /**
     * Construct a new {@link HashSet} with the contents of the provided {@link Iterable}, taking advantage of type inference to
     * avoid specifying the type on the rhs.
     */
    public static <E> HashSet<E> newHashSet(Iterable<? extends E> elements) {
        HashSet<E> set = newHashSet();
        for (E e : elements) {
            set.add(e);
        }
        return set;
    }
}