SymmetricSet.java

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/*
 *   DENOPTIM
 *   Copyright (C) 2019 Vishwesh Venkatraman <vishwesh.venkatraman@ntnu.no> and
 *   Marco Foscato <marco.foscato@uib.no>
 * 
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Affero General Public License as published
 *   by the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program 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 Affero General Public License for more details.
 *
 *   You should have received a copy of the GNU Affero General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
package denoptim.graph;
 
import java.util.ArrayList;
import java.util.Collection;
 
// NB: keep it a List, not a Set: having the order helps comparison.
 
public class SymmetricSet<T> extends ArrayList<T>
{
 
    private static final long serialVersionUID = 4L;
    
//------------------------------------------------------------------------------
 
    @Override
    public boolean add(T item)
    {
        if (!contains(item))
        {
            return super.add(item);
        } else {
            return false;
        }
    }
 
//------------------------------------------------------------------------------
 
}