org.jetbrains.kotlin.utils.HashSetUtil Maven / Gradle / Ivy
/*
* Copyright 2010-2015 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jetbrains.kotlin.utils;
import com.intellij.util.containers.hash.EqualityPolicy;
import com.intellij.util.containers.hash.HashSet;
import com.intellij.util.containers.hash.LinkedHashMap;
import org.jetbrains.annotations.NotNull;
import java.util.Map;
import java.util.Set;
public class HashSetUtil {
@NotNull
public static Set linkedHashSet(@NotNull Set set, @NotNull EqualityPolicy policy) {
// this implementation of LinkedHashMap doesn't admit nulls as values
Map map = new LinkedHashMap(policy);
for (T t : set) {
map.put(t, "");
}
return map.keySet();
}
@NotNull
public static Set symmetricDifference(@NotNull Set set1, @NotNull Set set2) {
Set intersection = new HashSet();
intersection.addAll(set1);
intersection.retainAll(set2);
Set result = new HashSet();
result.addAll(set1);
result.addAll(set2);
result.removeAll(intersection);
return result;
}
}