001/* 002 * #%L 003 * Netarchivesuite - harvester 004 * %% 005 * Copyright (C) 2005 - 2018 The Royal Danish Library, 006 * the National Library of France and the Austrian National Library. 007 * %% 008 * This program is free software: you can redistribute it and/or modify 009 * it under the terms of the GNU Lesser General Public License as 010 * published by the Free Software Foundation, either version 2.1 of the 011 * License, or (at your option) any later version. 012 * 013 * This program is distributed in the hope that it will be useful, 014 * but WITHOUT ANY WARRANTY; without even the implied warranty of 015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 016 * GNU General Lesser Public License for more details. 017 * 018 * You should have received a copy of the GNU General Lesser Public 019 * License along with this program. If not, see 020 * <http://www.gnu.org/licenses/lgpl-2.1.html>. 021 * #L% 022 */ 023package dk.netarkivet.harvester.harvesting.frontier; 024 025import java.util.Comparator; 026 027/** 028 * This class implements a natural order on {@link FrontierReportLine}. Comparisons are made : - first by decreasing 029 * values of totalEnqueues - secondly by domain name (string natural order) 030 */ 031public class FrontierReportLineNaturalOrder implements Comparator<FrontierReportLineOrderKey> { 032 033 private static final FrontierReportLineNaturalOrder order = new FrontierReportLineNaturalOrder(); 034 035 @Override 036 public int compare(FrontierReportLineOrderKey k1, FrontierReportLineOrderKey k2) { 037 int sizeComp = Long.valueOf(k1.getQueueSize()).compareTo(k2.getQueueSize()); 038 if (sizeComp == 0) { 039 return k1.getQueueId().compareTo(k2.getQueueId()); 040 } 041 return -sizeComp; 042 } 043 044 /** 045 * Returns the singleton instance of this class. 046 * 047 * @return the singleton instance of this class. 048 */ 049 public static FrontierReportLineNaturalOrder getInstance() { 050 return order; 051 } 052 053}