/*
 * 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.rating;

import java.io.Serializable;

import org.alfresco.service.cmr.rating.RatingService;
import org.alfresco.service.cmr.rating.RatingServiceException;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.repository.NodeService;
import org.alfresco.service.namespace.NamespaceService;
import org.springframework.beans.factory.InitializingBean;

/**
 * This class provides the basic implementation of a rating property rollup.
 * By providing an implementation of this class (or reusing an existing one),
 * injecting the object into the {@link RatingScheme} and following the content
 * model naming conventions described in {@link RatingRollupNamingConventionsUtil}, it
 * should be possible to have new rating property rollups automatically calculated
 * and persisted into the Alfresco content model, thereby enabling indexing, searching
 * and sorting of rating-related properties.
 * 
 * @author Neil McErlean
 * @since 3.5
 */
public abstract class AbstractRatingRollupAlgorithm implements InitializingBean
{
    protected String ratingSchemeName;
    protected NamespaceService namespaceService;
    protected NodeService nodeService;
    protected RatingServiceImpl ratingServiceImpl;
    
    protected final String rollupName;
    
    public AbstractRatingRollupAlgorithm(String rollupName)
    {
        this.rollupName = rollupName;
    }
    
    public void setRatingSchemeName(String ratingScheme)
    {
        this.ratingSchemeName = ratingScheme;
    }

    public void setNamespaceService(NamespaceService namespaceService)
    {
        this.namespaceService = namespaceService;
    }
    
    public void setNodeService(NodeService nodeService)
    {
        this.nodeService = nodeService;
    }
    
    public void setRatingService(RatingService ratingService)
    {
        this.ratingServiceImpl = (RatingServiceImpl)ratingService;
    }
    
    @Override
    public void afterPropertiesSet() throws Exception
    {
        if (ratingSchemeName == null)
        {
            throw new RatingServiceException("Illegal null ratingSchemeName in " + this.getClass().getSimpleName());
        }
    }
    
    public abstract Serializable recalculate(NodeRef ratedNode);
    
    /**
     * This method returns the rollup name, for example "Total" or "Count".
     * This rollup name is used as part of the convention-based naming of content model
     * property names see {@link RatingRollupNamingConventionsUtil}.
     * @return
     */
    public String getRollupName()
    {
        return this.rollupName;
    }
}