/*
 * Copyright (C) 2005-2011 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */

package org.alfresco.repo.publishing;

import static org.alfresco.repo.publishing.PublishingModel.PROP_CHANNEL_TYPE;

import java.util.Collections;
import java.util.Set;

import org.alfresco.repo.transfer.AbstractNodeFinder;
import org.alfresco.service.cmr.publishing.channels.ChannelService;
import org.alfresco.service.cmr.publishing.channels.ChannelType;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.NodeService;
import org.alfresco.service.cmr.transfer.NodeFinder;
import org.alfresco.util.ParameterCheck;

/**
 * @author Nick Smith
 * @since 4.0
 *
 */
public class ChannelDependancyNodeFinder extends AbstractNodeFinder
{
    private final ChannelService channelService;
    private NodeService nodeService;
    
    /**
     * @param channelService
     */
    public ChannelDependancyNodeFinder(ChannelService channelService)
    {
        this.channelService = channelService;
    }

    /**
    * {@inheritDoc}
    */
    @Override
    public void init()
    {
        super.init();
        this.nodeService = serviceRegistry.getNodeService();
        ParameterCheck.mandatory("channelService", channelService);
    }
    
    /**
    * {@inheritDoc}
    */
    public Set<NodeRef> findFrom(NodeRef thisNode)
    {
        String typeId = (String) nodeService.getProperty(thisNode, PROP_CHANNEL_TYPE);
        if(typeId !=null)
        {
            ChannelType type = channelService.getChannelType(typeId);
            if(type != null)
            {
                NodeFinder finder = type.getNodeFinder();
                if(finder !=null)
                {
                    return finder.findFrom(thisNode);
                }
            }
        }
        return Collections.emptySet();
    }
    
}