org/sonews/storage/Channel.java
author cli
Tue Apr 27 21:51:12 2010 +0200 (2010-04-27)
changeset 26 407c428adb5b
parent 3 2fdc9cc89502
child 31 087ef6fe6a1a
permissions -rw-r--r--
Introduce more advanced help system (#565).
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/*
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 *   SONEWS News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.sonews.storage;
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import java.util.ArrayList;
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import java.util.List;
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import org.sonews.util.Pair;
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/**
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 * A logical communication Channel is the a generic structural element for sets
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 * of messages; e.g. a Newsgroup for a set of Articles.
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 * A Channel can either be a real set of messages or an aggregated set of
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 * several subsets.
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 * @author Christian Lins
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 * @since sonews/1.0
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 */
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public abstract class Channel
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{
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  /**
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   * If this flag is set the Group is no real newsgroup but a mailing list
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   * mirror. In that case every posting and receiving mails must go through
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   * the mailing list gateway.
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   */
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  public static final int MAILINGLIST = 0x1;
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  /**
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   * If this flag is set the Group is marked as readonly and the posting
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   * is prohibited. This can be useful for groups that are synced only in
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   * one direction.
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   */
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  public static final int READONLY    = 0x2;
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  /**
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   * If this flag is set the Group is marked as deleted and must not occur
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   * in any output. The deletion is done lazily by a low priority daemon.
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   */
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  public static final int DELETED     = 0x80;
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  public static List<Channel> getAll()
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  {
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    List<Channel> all = new ArrayList<Channel>();
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    /*List<Channel> agroups = AggregatedGroup.getAll();
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    if(agroups != null)
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    {
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      all.addAll(agroups);
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    }*/
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    List<Channel> groups = Group.getAll();
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    if(groups != null)
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    {
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      all.addAll(groups);
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    }
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    return all;
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  }
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  public static Channel getByName(String name)
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  {
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    return Group.getByName(name);
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  }
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  public abstract Article getArticle(long idx)
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    throws StorageBackendException;
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  public abstract List<Pair<Long, ArticleHead>> getArticleHeads(
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    final long first, final long last)
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    throws StorageBackendException;
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  public abstract List<Long> getArticleNumbers()
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    throws StorageBackendException;
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  public abstract long getFirstArticleNumber()
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    throws StorageBackendException;
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  public abstract long getIndexOf(Article art)
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    throws StorageBackendException;
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  public abstract long getInternalID();
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  public abstract long getLastArticleNumber()
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    throws StorageBackendException;
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  public abstract String getName();
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  public abstract long getPostingsCount()
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    throws StorageBackendException;
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  public abstract boolean isDeleted();
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  public abstract boolean isWriteable();
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}