| /** |
| * 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 java.util.Comparator; |
| |
| |
| /** |
| * A very basic pair type. |
| */ |
| 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 = car; |
| second = cdr; |
| } |
| |
| public S getFirst() { return first; } |
| public T getSecond() { return second; } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (null == o) { |
| return false; |
| } else if (o instanceof Pair) { |
| Pair<S, T> p = (Pair<S, T>) o; |
| if (first == null && second == null) { |
| return p.first == null && p.second == null; |
| } else if (first == null) { |
| return p.first == null && second.equals(p.second); |
| } else if (second == null) { |
| return p.second == null && first.equals(p.first); |
| } else { |
| return first.equals(p.first) && second.equals(p.second); |
| } |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public int hashCode() { |
| int code = 0; |
| |
| if (null != first) { |
| code += first.hashCode(); |
| } |
| |
| if (null != second) { |
| code += second.hashCode() << 1; |
| } |
| |
| return code; |
| } |
| |
| @Override |
| public int compareTo(Pair<S, T> p) { |
| if (null == p) { |
| return 1; |
| } |
| |
| Comparable<S> firstCompare = (Comparable<S>) first; |
| |
| int firstResult = firstCompare.compareTo(p.first); |
| if (firstResult == 0) { |
| Comparable<T> secondCompare = (Comparable<T>) second; |
| return secondCompare.compareTo(p.second); |
| } else { |
| return firstResult; |
| } |
| } |
| |
| // TODO: Can this be made static? Same with SecondElemComparator? |
| public class FirstElemComparator implements Comparator<Pair<S, T>> { |
| public FirstElemComparator() { |
| } |
| |
| public int compare(Pair<S, T> p1, Pair<S, T> p2) { |
| Comparable<S> cS = (Comparable<S>) p1.first; |
| return cS.compareTo(p2.first); |
| } |
| } |
| |
| public class SecondElemComparator implements Comparator<Pair<S, T>> { |
| public SecondElemComparator() { |
| } |
| |
| public int compare(Pair<S, T> p1, Pair<S, T> p2) { |
| Comparable<T> cT = (Comparable<T>) p1.second; |
| return cT.compareTo(p2.second); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| String firstString = "null"; |
| String secondString = "null"; |
| |
| if (null != first) { |
| firstString = first.toString(); |
| } |
| |
| if (null != second) { |
| secondString = second.toString(); |
| } |
| |
| return "(" + firstString + ", " + secondString + ")"; |
| } |
| } |