Java Collection Unique addUnique(C collection, T item)

Description

add Unique

License

Open Source License

Declaration

private static <T, C extends Collection<T>> void addUnique(C collection, T item) 

Method Source Code

//package com.java2s;
/**/*from ww w.j  a v  a  2  s.  c  o  m*/
 * Copyright (c) 2002-2014 "Neo Technology,"
 * Network Engine for Objects in Lund AB [http://neotechnology.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.Collection;

public class Main {
    private static <T, C extends Collection<T>> void addUnique(C collection, T item) {
        if (!collection.add(item)) {
            throw new IllegalStateException("Encountered an already added item:" + item
                    + " when adding items uniquely to a collection:" + collection);
        }
    }
}

Related

1. addUnique(final Collection collection, final Object value)
2. generateUniqueName(String aName, Collection aStringCollection)
3. getUnique(Collection c)
4. getUnique(Collection collection)