001/*
002 * #%L
003 * Netarchivesuite - harvester
004 * %%
005 * Copyright (C) 2005 - 2014 The Royal Danish Library, the Danish State and University 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 dk.netarkivet.harvester.harvesting.frontier.FullFrontierReport.ReportIterator;
026
027/**
028 * Filters a frontier report to include only lines that represent exhausted queues. An Heritrix queue is exhausted when
029 * its current size is zero.
030 */
031public class ExhaustedQueuesFilter extends MaxSizeFrontierReportExtract {
032
033    @Override
034    public InMemoryFrontierReport process(FrontierReport initialFrontier) {
035        InMemoryFrontierReport result = new InMemoryFrontierReport(initialFrontier.getJobName());
036
037        FullFrontierReport full = (FullFrontierReport) initialFrontier;
038        ReportIterator iter = full.iterateOnDuplicateCurrentSize(0L);
039
040        int maxSize = getMaxSize();
041        int addedLines = 0;
042        while (addedLines <= maxSize && iter.hasNext()) {
043            result.addLine(new FrontierReportLine(iter.next()));
044            addedLines++;
045        }
046
047        return result;
048    }
049
050}