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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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* 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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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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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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throws StorageBackendException {
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return StorageManager.current().getGroup(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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}
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