chris@1: /* chris@1: * SONEWS News Server chris@1: * see AUTHORS for the list of contributors chris@1: * chris@1: * This program is free software: you can redistribute it and/or modify chris@1: * it under the terms of the GNU General Public License as published by chris@1: * the Free Software Foundation, either version 3 of the License, or chris@1: * (at your option) any later version. chris@1: * chris@1: * This program is distributed in the hope that it will be useful, chris@1: * but WITHOUT ANY WARRANTY; without even the implied warranty of chris@1: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the chris@1: * GNU General Public License for more details. chris@1: * chris@1: * You should have received a copy of the GNU General Public License chris@1: * along with this program. If not, see . chris@1: */ chris@1: chris@1: package org.sonews.daemon.command; chris@1: chris@1: import java.io.IOException; chris@1: import org.sonews.daemon.NNTPConnection; chris@3: import org.sonews.storage.Article; chris@3: import org.sonews.storage.Channel; chris@3: import org.sonews.storage.StorageBackendException; chris@1: chris@1: /** chris@1: * Class handling the NEXT and LAST command. chris@1: * @author Christian Lins chris@1: * @author Dennis Schwerdel chris@1: * @since n3tpd/0.1 chris@1: */ chris@3: public class NextPrevCommand implements Command chris@1: { chris@1: cli@37: @Override cli@37: public String[] getSupportedCommandStrings() cli@37: { cli@37: return new String[] {"NEXT", "PREV"}; cli@37: } chris@1: cli@37: @Override cli@37: public boolean hasFinished() cli@37: { cli@37: return true; cli@37: } chris@1: cli@37: @Override cli@37: public String impliedCapability() cli@37: { cli@37: return null; cli@37: } cli@20: cli@37: @Override cli@37: public boolean isStateful() cli@37: { cli@37: return false; cli@37: } chris@3: cli@37: @Override cli@37: public void processLine(NNTPConnection conn, final String line, byte[] raw) cli@37: throws IOException, StorageBackendException cli@37: { cli@37: final Article currA = conn.getCurrentArticle(); cli@37: final Channel currG = conn.getCurrentChannel(); chris@1: cli@37: if (currA == null) { cli@37: conn.println("420 no current article has been selected"); cli@37: return; cli@37: } chris@1: cli@37: if (currG == null) { cli@37: conn.println("412 no newsgroup selected"); cli@37: return; cli@37: } chris@1: cli@37: final String[] command = line.split(" "); chris@1: cli@37: if (command[0].equalsIgnoreCase("NEXT")) { cli@37: selectNewArticle(conn, currA, currG, 1); cli@37: } else if (command[0].equalsIgnoreCase("PREV")) { cli@37: selectNewArticle(conn, currA, currG, -1); cli@37: } else { cli@37: conn.println("500 internal server error"); cli@37: } cli@37: } cli@37: cli@37: private void selectNewArticle(NNTPConnection conn, Article article, Channel grp, cli@37: final int delta) cli@37: throws IOException, StorageBackendException cli@37: { cli@37: assert article != null; cli@37: cli@37: article = grp.getArticle(grp.getIndexOf(article) + delta); cli@37: cli@37: if (article == null) { cli@37: conn.println("421 no next article in this group"); cli@37: } else { cli@37: conn.setCurrentArticle(article); cli@37: conn.println("223 " + conn.getCurrentChannel().getIndexOf(article) cli@37: + " " + article.getMessageID() cli@37: + " article retrieved - request text separately"); cli@37: } cli@37: } chris@1: }