| /** |
| * 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.hadoop.mrunit.types; |
| |
| import static org.apache.hadoop.mrunit.internal.util.ArgumentChecker.returnNonNull; |
| |
| import java.util.Comparator; |
| |
| /** |
| * A very basic pair type that does not allow null values. |
| * |
| * @param <S> |
| * @param <T> |
| */ |
| @SuppressWarnings("unchecked") |
| public class Pair<S, T> implements Comparable<Pair<S, T>> { |
| |
| private final S first; |
| private final T second; |
| |
| public Pair(final S car, final T cdr) { |
| first = returnNonNull(car); |
| second = returnNonNull(cdr); |
| } |
| |
| public S getFirst() { |
| return first; |
| } |
| |
| public T getSecond() { |
| return second; |
| } |
| |
| @Override |
| public boolean equals(final Object o) { |
| if (o instanceof Pair) { |
| final Pair<S, T> p = (Pair<S, T>) o; |
| return first.equals(p.first) && second.equals(p.second); |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return first.hashCode() + (second.hashCode() << 1); |
| } |
| |
| @Override |
| public int compareTo(final Pair<S, T> p) { |
| final int firstResult = ((Comparable<S>) first).compareTo(p.first); |
| if (firstResult == 0) { |
| return ((Comparable<T>) second).compareTo(p.second); |
| } |
| return firstResult; |
| } |
| |
| public static class FirstElemComparator<S, T> implements Comparator<Pair<S, T>> { |
| public FirstElemComparator() { |
| } |
| |
| @Override |
| public int compare(final Pair<S, T> p1, final Pair<S, T> p2) { |
| return ((Comparable<S>) p1.first).compareTo(p2.first); |
| } |
| } |
| |
| public static class SecondElemComparator<S, T> implements Comparator<Pair<S, T>> { |
| public SecondElemComparator() { |
| } |
| |
| @Override |
| public int compare(final Pair<S, T> p1, final Pair<S, T> p2) { |
| return ((Comparable<T>) p1.second).compareTo(p2.second); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return "(" + first + ", " + second + ")"; |
| } |
| } |