// BlogBridge -- RSS feed reader, manager, and web based service
// Copyright (C) 2002-2006 by R. Pito Salas
//
// This program is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free Software Foundation;
// either version 2 of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
// without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along with this program;
// if not, write to the Free Software Foundation, Inc., 59 Temple Place,
// Suite 330, Boston, MA 02111-1307 USA
//
// Contact: R. Pito Salas
// mailto:pitosalas@users.sourceforge.net
// More information: about BlogBridge
// http://www.blogbridge.com
// http://sourceforge.net/projects/blogbridge
//
// $Id: GotoNextGuideWithUnreadAction.java,v 1.8 2007/04/17 14:49:14 spyromus Exp $
//
package com.salas.bb.core.actions.guide;
import com.salas.bb.core.GlobalController;
import com.salas.bb.core.GlobalModel;
import com.salas.bb.core.GuidesListModel;
import com.salas.bb.domain.GuidesSet;
import com.salas.bb.domain.IGuide;
import javax.swing.*;
import java.awt.event.ActionEvent;
/**
* Moves to next Guide that has any unread articles.
* <p/>
* Action is enabled/disabled by <code>ActionsManager</code>.
*/
public final class GotoNextGuideWithUnreadAction extends AbstractAction
{
private static GotoNextGuideWithUnreadAction instance;
/**
* Hidden constructor of singleton class.
*/
private GotoNextGuideWithUnreadAction()
{
setEnabled(false);
}
/**
* Returns initialized instance.
*
* @return instance of action.
*/
public static GotoNextGuideWithUnreadAction getInstance()
{
if (instance == null) instance = new GotoNextGuideWithUnreadAction();
return instance;
}
/**
* Invoked when action occurs.
*
* @param e action event details object.
*/
public void actionPerformed(ActionEvent e)
{
final GlobalController controller = GlobalController.SINGLETON;
final GlobalModel model = controller.getModel();
if (model != null)
{
final IGuide currentGuide = model.getSelectedGuide();
final GuidesSet cgs = model.getGuidesSet();
IGuide guide = findNextGuideWithUnread(cgs, currentGuide);
// EDT !!!
if (guide != null) GlobalController.SINGLETON.selectGuide(guide, false);
}
}
/**
* Finds the guide with channels containing unread articles.
*
* @param cgs guides set.
* @param currentGuide currebt guide.
*
* @return guide or <code>NULL</code> if no such guides found.
*/
static IGuide findNextGuideWithUnread(final GuidesSet cgs,
final IGuide currentGuide)
{
IGuide guide = currentGuide;
boolean found = false;
GuidesListModel glm = GlobalController.SINGLETON.getGuidesListModel();
while (!found)
{
guide = nextGuide(cgs, guide);
found = guide == currentGuide || (!guide.isRead() && glm.indexOf(guide) != -1);
}
return currentGuide == guide ? null : guide;
}
/**
* Returns guide, next to specified in the given set.
*
* @param set set of guides.
* @param guide guide.
*
* @return next guide.
*/
private static IGuide nextGuide(GuidesSet set, IGuide guide)
{
int index = set.indexOf(guide);
int guidesCount = set.getGuidesCount();
if (index == -1 || index == guidesCount - 1) index = 0; else index++;
return set.getGuideAt(index);
}
}