| /** |
| * 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 com.datatorrent.stram.util; |
| |
| import java.util.Comparator; |
| |
| /** |
| * Used to wrap around long int values safely<p> |
| * <br> |
| * Needed to ensure that windowId wrap around safely<br> |
| * {@see StablePriorityQueue}<br> |
| * <br> |
| * |
| * @since 0.3.2 |
| */ |
| |
| class StableWrapper<E> |
| { |
| public final int id; |
| public final E object; |
| |
| public StableWrapper(E o, int id) |
| { |
| this.id = id; |
| this.object = o; |
| } |
| |
| static class NaturalComparator<E> implements Comparator<StableWrapper<E>> |
| { |
| @Override |
| public int compare(StableWrapper<E> o1, StableWrapper<E> o2) |
| { |
| @SuppressWarnings({"unchecked", "rawtypes"}) |
| int ret = ((Comparable)o1.object).compareTo(o2.object); |
| |
| if (ret == 0) { |
| if (o1.id > o2.id) { |
| ret = 1; |
| } else if (o1.id < o2.id) { |
| ret = -1; |
| } |
| } |
| |
| return ret; |
| } |
| } |
| |
| static class ProvidedComparator<E> implements Comparator<StableWrapper<E>> |
| { |
| public final Comparator<? super E> comparator; |
| |
| public ProvidedComparator(Comparator<? super E> comparator) |
| { |
| this.comparator = comparator; |
| } |
| |
| @Override |
| public int compare(StableWrapper<E> o1, StableWrapper<E> o2) |
| { |
| int ret = comparator.compare(o1.object, o2.object); |
| |
| if (ret == 0) { |
| if (o1.id > o2.id) { |
| ret = 1; |
| } else if (o1.id < o2.id) { |
| ret = -1; |
| } |
| } |
| |
| return ret; |
| } |
| } |
| |
| } |
| |