Add Pair utility class

4.4
Florian Schmaus 2 years ago
parent 048226960b
commit 15e3d267f6
  1. 64
      smack-core/src/main/java/org/jivesoftware/smack/util/Pair.java

@ -0,0 +1,64 @@
/**
*
* Copyright 2020 Florian Schmaus.
*
* 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.jivesoftware.smack.util;
public final class Pair<F, S> {
private final F first;
private final S second;
private Pair(F first, S second) {
this.first = first;
this.second = second;
}
public static <F extends Object, S extends Object> Pair<F, S> create(F first, S second) {
return new Pair<>(first, second);
}
public static <F extends Object, S extends Object> Pair<F, S> createAndInitHashCode(F first, S second) {
Pair<F, S> pair = new Pair<>(first, second);
pair.hashCode();
return pair;
}
public F getFirst() {
return first;
}
public S getSecond() {
return second;
}
private final HashCode.Cache hashCodeCache = new HashCode.Cache();
@Override
public int hashCode() {
return hashCodeCache.getHashCode(c ->
c.append(first)
.append(second)
);
}
@Override
public boolean equals(Object object) {
return EqualsUtil.equals(this, object, (e, o) ->
e.append(first, o.first)
.append(second, o.second)
);
}
}
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