org.nd4j.common.util.SetUtils Maven / Gradle / Ivy
/*
* ******************************************************************************
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* *
* * This program and the accompanying materials are made available under the
* * terms of the Apache License, Version 2.0 which is available at
* * https://www.apache.org/licenses/LICENSE-2.0.
* *
* * See the NOTICE file distributed with this work for additional
* * information regarding copyright ownership.
* * 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.
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* * SPDX-License-Identifier: Apache-2.0
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*/
package org.nd4j.common.util;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
public class SetUtils {
protected SetUtils() {}
// Set specific operations
public static Set intersection(Collection parentCollection, Collection removeFromCollection) {
Set results = new HashSet<>(parentCollection);
results.retainAll(removeFromCollection);
return results;
}
public static boolean intersectionP(Set s1, Set s2) {
for (T elt : s1) {
if (s2.contains(elt))
return true;
}
return false;
}
public static Set union(Set s1, Set s2) {
Set s3 = new HashSet<>(s1);
s3.addAll(s2);
return s3;
}
/** Return is s1 \ s2 */
public static Set difference(Collection s1, Collection s2) {
Set s3 = new HashSet<>(s1);
s3.removeAll(s2);
return s3;
}
}