chris@3: /*
chris@3:  *   SONEWS News Server
chris@3:  *   see AUTHORS for the list of contributors
chris@3:  *
chris@3:  *   This program is free software: you can redistribute it and/or modify
chris@3:  *   it under the terms of the GNU General Public License as published by
chris@3:  *   the Free Software Foundation, either version 3 of the License, or
chris@3:  *   (at your option) any later version.
chris@3:  *
chris@3:  *   This program is distributed in the hope that it will be useful,
chris@3:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@3:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@3:  *   GNU General Public License for more details.
chris@3:  *
chris@3:  *   You should have received a copy of the GNU General Public License
chris@3:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@3:  */
chris@3: package org.sonews.storage;
chris@3: 
chris@3: import java.util.ArrayList;
chris@3: import java.util.List;
chris@3: import org.sonews.util.Pair;
chris@3: 
chris@3: /**
chris@3:  * A logical communication Channel is the a generic structural element for sets
chris@3:  * of messages; e.g. a Newsgroup for a set of Articles.
chris@3:  * A Channel can either be a real set of messages or an aggregated set of
chris@3:  * several subsets.
chris@3:  * @author Christian Lins
chris@3:  * @since sonews/1.0
chris@3:  */
cli@42: public abstract class Channel {
chris@3: 
cli@37: 	/**
cli@37: 	 * If this flag is set the Group is no real newsgroup but a mailing list
cli@37: 	 * mirror. In that case every posting and receiving mails must go through
cli@37: 	 * the mailing list gateway.
cli@37: 	 */
cli@37: 	public static final int MAILINGLIST = 0x1;
cli@37: 	/**
cli@37: 	 * If this flag is set the Group is marked as readonly and the posting
cli@37: 	 * is prohibited. This can be useful for groups that are synced only in
cli@37: 	 * one direction.
cli@37: 	 */
cli@37: 	public static final int READONLY = 0x2;
cli@37: 	/**
cli@37: 	 * If this flag is set the Group is marked as deleted and must not occur
cli@37: 	 * in any output. The deletion is done lazily by a low priority daemon.
cli@37: 	 */
cli@37: 	public static final int DELETED = 0x80;
chris@3: 
cli@42: 	public static List<Channel> getAll() {
cli@37: 		List<Channel> all = new ArrayList<Channel>();
chris@3: 
cli@37: 		/*List<Channel> agroups = AggregatedGroup.getAll();
cli@37: 		if(agroups != null)
cli@37: 		{
cli@37: 		all.addAll(agroups);
cli@37: 		}*/
chris@3: 
cli@37: 		List<Channel> groups = Group.getAll();
cli@37: 		if (groups != null) {
cli@37: 			all.addAll(groups);
cli@37: 		}
chris@3: 
cli@37: 		return all;
cli@37: 	}
chris@3: 
cli@37: 	public static Channel getByName(String name)
cli@42: 			throws StorageBackendException {
cli@37: 		return StorageManager.current().getGroup(name);
cli@37: 	}
chris@3: 
cli@37: 	public abstract Article getArticle(long idx)
cli@42: 			throws StorageBackendException;
chris@3: 
cli@37: 	public abstract List<Pair<Long, ArticleHead>> getArticleHeads(
cli@42: 			final long first, final long last)
cli@42: 			throws StorageBackendException;
chris@3: 
cli@37: 	public abstract List<Long> getArticleNumbers()
cli@42: 			throws StorageBackendException;
chris@3: 
cli@37: 	public abstract long getFirstArticleNumber()
cli@42: 			throws StorageBackendException;
chris@3: 
cli@37: 	public abstract long getIndexOf(Article art)
cli@42: 			throws StorageBackendException;
chris@3: 
cli@37: 	public abstract long getInternalID();
chris@3: 
cli@37: 	public abstract long getLastArticleNumber()
cli@42: 			throws StorageBackendException;
chris@3: 
cli@37: 	public abstract String getName();
chris@3: 
cli@37: 	public abstract long getPostingsCount()
cli@42: 			throws StorageBackendException;
chris@3: 
cli@37: 	public abstract boolean isDeleted();
chris@3: 
cli@37: 	public abstract boolean isWriteable();
chris@3: }