org.nd4j.util.SetUtils Maven / Gradle / Ivy
/*-
*
* * Copyright 2015 Skymind,Inc.
* *
* * 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.nd4j.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;
}
}