58 lines
1.8 KiB
Java
58 lines
1.8 KiB
Java
/*******************************************************************************
|
|
* Copyright (c) 2015-2018 Skymind, Inc.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
******************************************************************************/
|
|
|
|
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 <T> Set<T> intersection(Collection<T> parentCollection, Collection<T> removeFromCollection) {
|
|
Set<T> results = new HashSet<>(parentCollection);
|
|
results.retainAll(removeFromCollection);
|
|
return results;
|
|
}
|
|
|
|
public static <T> boolean intersectionP(Set<? extends T> s1, Set<? extends T> s2) {
|
|
for (T elt : s1) {
|
|
if (s2.contains(elt))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
public static <T> Set<T> union(Set<? extends T> s1, Set<? extends T> s2) {
|
|
Set<T> s3 = new HashSet<>(s1);
|
|
s3.addAll(s2);
|
|
return s3;
|
|
}
|
|
|
|
/** Return is s1 \ s2 */
|
|
|
|
public static <T> Set<T> difference(Collection<? extends T> s1, Collection<? extends T> s2) {
|
|
Set<T> s3 = new HashSet<>(s1);
|
|
s3.removeAll(s2);
|
|
return s3;
|
|
}
|
|
}
|
|
|
|
|