| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.sshd.common.util; |
| |
| import java.util.Comparator; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| import java.util.Objects; |
| |
| /** |
| * Represents an un-modifiable pair of values |
| * |
| * @param <F> First value type |
| * @param <S> Second value type |
| * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a> |
| */ |
| public class Pair<F, S> implements Map.Entry<F, S> { |
| @SuppressWarnings("rawtypes") |
| private static final Comparator<Map.Entry<Comparable, ?>> BY_KEY_COMPARATOR = |
| new Comparator<Map.Entry<Comparable, ?>>() { |
| @SuppressWarnings("unchecked") |
| @Override |
| public int compare(Entry<Comparable, ?> o1, Entry<Comparable, ?> o2) { |
| Comparable k1 = o1.getKey(); |
| Comparable k2 = o2.getKey(); |
| return k1.compareTo(k2); |
| } |
| }; |
| |
| private final F first; |
| private final S second; |
| |
| public Pair(F first, S second) { |
| this.first = first; |
| this.second = second; |
| } |
| |
| @Override |
| public final F getKey() { |
| return getFirst(); |
| } |
| |
| @Override |
| public S getValue() { |
| return getSecond(); |
| } |
| |
| @Override |
| public S setValue(S value) { |
| throw new UnsupportedOperationException("setValue(" + value + ") N/A"); |
| } |
| |
| public final F getFirst() { |
| return first; |
| } |
| |
| public final S getSecond() { |
| return second; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hashCode(getFirst()) * 31 + Objects.hashCode(getSecond()); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == null) { |
| return false; |
| } |
| |
| if (obj == this) { |
| return true; |
| } |
| |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| |
| Pair<?, ?> other = (Pair<?, ?>)obj; |
| return Objects.equals(getFirst(), other.getFirst()) && Objects.equals(getSecond(), other.getSecond()); |
| } |
| |
| @Override |
| public String toString() { |
| return Objects.toString(getFirst()) + ", " + Objects.toString(getSecond()); |
| } |
| |
| /** |
| * @param <K> The {@link Comparable} key type |
| * @param <V> The associated entry value |
| * @return A {@link Comparator} for {@link java.util.Map.Entry}-ies that |
| * compares the key values |
| */ |
| @SuppressWarnings({ "unchecked", "rawtypes" }) |
| public static <K extends Comparable<K>, V> Comparator<Map.Entry<K, V>> byKeyEntryComparator() { |
| return (Comparator) BY_KEY_COMPARATOR; |
| } |
| } |