/* ********************************************************************** **
** Copyright notice **
** **
** (c) 2005-2009 RSSOwl Development Team **
** http://www.rssowl.org/ **
** **
** All rights reserved **
** **
** This program and the accompanying materials are made available under **
** the terms of the Eclipse Public License v1.0 which accompanies this **
** distribution, and is available at: **
** http://www.rssowl.org/legal/epl-v10.html **
** **
** A copy is found in the file epl-v10.html and important notices to the **
** license from the team is found in the textfile LICENSE.txt distributed **
** in this package. **
** **
** This copyright notice MUST APPEAR in all copies of the file! **
** **
** Contributors: **
** RSSOwl Development Team - initial API and implementation **
** **
** ********************************************************************** */
package org.rssowl.core.internal.persist.dao;
import org.rssowl.core.internal.persist.Label;
import org.rssowl.core.internal.persist.News;
import org.rssowl.core.persist.ILabel;
import org.rssowl.core.persist.INews;
import org.rssowl.core.persist.dao.DynamicDAO;
import org.rssowl.core.persist.dao.ILabelDAO;
import org.rssowl.core.persist.event.LabelEvent;
import org.rssowl.core.persist.event.LabelListener;
import com.db4o.query.Query;
import java.util.List;
/**
* A data-access-object for <code>ILabel</code>s.
*
* @author Ismael Juma (ismael@juma.me.uk)
*/
public final class LabelDAOImpl extends AbstractEntityDAO<ILabel, LabelListener, LabelEvent> implements ILabelDAO {
/** Default constructor using the specific IPersistable for this DAO */
public LabelDAOImpl() {
super(Label.class, false);
}
@Override
protected final LabelEvent createDeleteEventTemplate(ILabel entity) {
return new LabelEvent(null, entity, true);
}
@Override
protected void doDelete(ILabel entity) {
Query query = fDb.query();
query.constrain(News.class);
query.descend("fLabels").constrain(entity); //$NON-NLS-1$
@SuppressWarnings("unchecked")
List<INews> news = query.execute();
for (INews newsItem : news) {
newsItem.removeLabel(entity);
}
DynamicDAO.saveAll(news);
super.doDelete(entity);
}
@Override
protected final LabelEvent createSaveEventTemplate(ILabel entity) {
ILabel oldLabel = fDb.ext().peekPersisted(entity, Integer.MAX_VALUE, true);
return new LabelEvent(oldLabel, entity, true);
}
}