/*
 * Copyright (c) 2009-2010 Lockheed Martin Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.eurekastreams.server.service.actions.strategies.galleryitem;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eurekastreams.commons.exceptions.ValidationException;
import org.eurekastreams.server.domain.GalleryItem;
import org.eurekastreams.server.persistence.GalleryItemMapper;

/**
 * Updates a gallery item.
 * 
 * @param <T>
 *            the type of gallery item.
 */
public class GalleryItemUpdater<T extends GalleryItem> implements GalleryItemSaver<T>
{

    /**
     * Logger.
     */
    private Log log = LogFactory.getLog(GalleryItemUpdater.class);
    
    /**
     * url key.
     */
    private static final String URL_KEY = "url";

    /**
     * Mapper used to get the galleryItem.
     */
    private GalleryItemMapper galleryItemMapper = null;

    /**
     * Constructor.
     * 
     * @param inGalleryItemMapper
     *            injecting the inGalleryItemMapper
     */
    public GalleryItemUpdater(
            final GalleryItemMapper<T> inGalleryItemMapper)
    {
        galleryItemMapper = inGalleryItemMapper;
    }

     /** 
     * Updates a gallery item.
     * 
     * @param inGalleryItem 
     *          the gallery item to update.
     */
    @SuppressWarnings("unchecked")
    public void save(final T inGalleryItem)
    {
        String urlToCheck = inGalleryItem.getUrl();
        T inUseGalleryItem = (T) galleryItemMapper.findByUrl(urlToCheck);
        
        //If result is found for url and it's not the current item being updated,
        //throw exception
        if (inUseGalleryItem != null && (inUseGalleryItem.getUUID() != inGalleryItem.getUUID()))
        {
            ValidationException ve = new ValidationException();
            ve.addError(URL_KEY, "Url has already been uploaded to Eureka");
            throw ve;
        }
        galleryItemMapper.flush();
    }
}