sonews-drupal: src/org/sonews/daemon/command/NextPrevCommand.java@70286a6cf338

     1 /*

     2  *   SONEWS News Server

     3  *   see AUTHORS for the list of contributors

     4  *

     5  *   This program is free software: you can redistribute it and/or modify

     6  *   it under the terms of the GNU General Public License as published by

     7  *   the Free Software Foundation, either version 3 of the License, or

     8  *   (at your option) any later version.

     9  *

    10  *   This program is distributed in the hope that it will be useful,

    11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of

    12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    13  *   GNU General Public License for more details.

    14  *

    15  *   You should have received a copy of the GNU General Public License

    16  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.

    17  */

    18 package org.sonews.daemon.command;

    20 import java.io.IOException;

    21 import org.sonews.daemon.NNTPConnection;

    22 import org.sonews.storage.Article;

    23 import org.sonews.storage.Group;

    24 import org.sonews.storage.StorageBackendException;

    26 /**

    27  * Class handling the NEXT and LAST command.

    28  * @author Christian Lins

    29  * @author Dennis Schwerdel

    30  * @since n3tpd/0.1

    31  */

    32 public class NextPrevCommand implements Command {

    34 	@Override

    35 	public String[] getSupportedCommandStrings() {

    36 		return new String[]{"NEXT", "PREV"};

    37 	}

    39 	@Override

    40 	public boolean hasFinished() {

    41 		return true;

    42 	}

    44 	@Override

    45 	public String impliedCapability() {

    46 		return null;

    47 	}

    49 	@Override

    50 	public boolean isStateful() {

    51 		return false;

    52 	}

    54 	@Override

    55 	public void processLine(NNTPConnection conn, final String line, byte[] raw)

    56 			throws IOException, StorageBackendException {

    57 		final Article currA = conn.getCurrentArticle();

    58 		final Group currG = conn.getCurrentChannel();

    60 		if (currA == null) {

    61 			conn.println("420 no current article has been selected");

    62 			return;

    63 		}

    65 		if (currG == null) {

    66 			conn.println("412 no newsgroup selected");

    67 			return;

    68 		}

    70 		final String[] command = line.split(" ");

    72 		if (command[0].equalsIgnoreCase("NEXT")) {

    73 			selectNewArticle(conn, currA, currG, 1);

    74 		} else if (command[0].equalsIgnoreCase("PREV")) {

    75 			selectNewArticle(conn, currA, currG, -1);

    76 		} else {

    77 			conn.println("500 internal server error");

    78 		}

    79 	}

    81 	private void selectNewArticle(NNTPConnection conn, Article article, Group grp,

    82 			final int delta)

    83 			throws IOException, StorageBackendException {

    84 		assert article != null;

    86 		article = grp.getArticle(grp.getIndexOf(article) + delta);

    88 		if (article == null) {

    89 			conn.println("421 no next article in this group");

    90 		} else {

    91 			conn.setCurrentArticle(article);

    92 			conn.println("223 " + conn.getCurrentChannel().getIndexOf(article)

    93 					+ " " + article.getMessageID()

    94 					+ " article retrieved - request text separately");

    95 		}

    96 	}

    97 }

author	František Kučera <franta-hg@frantovo.cz>
	Mon, 17 Oct 2011 19:50:23 +0200
changeset 91	70286a6cf338
parent 48	b78e77619152
permissions	-rwxr-xr-x