/**
* Copyright (C) 2010-2017 Gordon Fraser, Andrea Arcuri and EvoSuite
* contributors
*
* This file is part of EvoSuite.
*
* EvoSuite 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 3.0 of the License, or
* (at your option) any later version.
*
* EvoSuite 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 Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with EvoSuite. If not, see <http://www.gnu.org/licenses/>.
*/
package com.examples.with.different.packagename.generic;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
public class GenericCollectionUtil {
public static <E> List<E> intersection(final List<? extends E> list1, final List<? extends E> list2) {
final List<E> result = new ArrayList<E>();
List<? extends E> smaller = list1;
List<? extends E> larger = list2;
if (list1.size() > list2.size()) {
smaller = list2;
larger = list1;
}
final HashSet<E> hashSet = new HashSet<E>(smaller);
for (final E e : larger) {
if (hashSet.contains(e)) {
result.add(e);
hashSet.remove(e);
}
}
return result;
}
}