/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (C) Alkacon Software (http://www.alkacon.com)
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 * This library 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.
 *
 * For further information about Alkacon Software, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.xml.containerpage;

import org.opencms.file.CmsObject;
import org.opencms.file.CmsResource;
import org.opencms.main.CmsException;
import org.opencms.main.CmsLog;
import org.opencms.xml.CmsXmlContentDefinition;
import org.opencms.xml.content.CmsDefaultXmlContentHandler;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.apache.commons.logging.Log;

/**
 * The XML content handler class for group containers.
 */
public class CmsXmlGroupContainerHandler extends CmsDefaultXmlContentHandler {

    /** The log instance for this class. */
    protected static final Log LOG = CmsLog.getLog(CmsXmlGroupContainerHandler.class);

    /**
     * Default constructor.<p>
     * 
     */
    public CmsXmlGroupContainerHandler() {

        super();
    }

    /**
     * Helper method to load and prepare the elements of a group container.<p>
     * 
     * @param cms the current CMS context 
     * @param resource the group container resource 
     * 
     * @return the elements which have been read from the group container
     *  
     * @throws CmsException if something goes wrong 
     */
    protected static List<CmsContainerElementBean> loadGroupContainerElements(CmsObject cms, CmsResource resource)
    throws CmsException {

        CmsXmlGroupContainer xmlGroupContainer = CmsXmlGroupContainerFactory.unmarshal(cms, resource);
        CmsGroupContainerBean groupContainer = xmlGroupContainer.getGroupContainer(
            cms,
            cms.getRequestContext().getLocale());
        List<CmsContainerElementBean> elemBeans = groupContainer.getElements();
        List<CmsContainerElementBean> result = new ArrayList<CmsContainerElementBean>();
        for (CmsContainerElementBean elementBean : elemBeans) {
            if (!elementBean.isInMemoryOnly()) {
                elementBean.initResource(cms);
                result.add(elementBean);
            }
        }
        return result;
    }

    /**
     * @see org.opencms.xml.content.CmsDefaultXmlContentHandler#getCSSHeadIncludes(org.opencms.file.CmsObject, org.opencms.file.CmsResource)
     */
    @Override
    public Set<String> getCSSHeadIncludes(CmsObject cms, CmsResource resource) throws CmsException {

        Set<String> result = new HashSet<String>();

        List<CmsContainerElementBean> containerElements = loadGroupContainerElements(cms, resource);
        for (CmsContainerElementBean elementBean : containerElements) {
            CmsResource elementResource = elementBean.getResource();
            Set<String> elementIncludes = CmsXmlContentDefinition.getContentHandlerForResource(cms, elementResource).getCSSHeadIncludes(
                cms,
                elementResource);
            result.addAll(elementIncludes);
        }
        return result;
    }

    /**
     * @see org.opencms.xml.content.CmsDefaultXmlContentHandler#getJSHeadIncludes(org.opencms.file.CmsObject, org.opencms.file.CmsResource)
     */
    @Override
    public Set<String> getJSHeadIncludes(CmsObject cms, CmsResource resource) throws CmsException {

        Set<String> result = new HashSet<String>();
        List<CmsContainerElementBean> containerElements = loadGroupContainerElements(cms, resource);
        for (CmsContainerElementBean elementBean : containerElements) {
            CmsResource elementResource = elementBean.getResource();
            Set<String> elementIncludes = CmsXmlContentDefinition.getContentHandlerForResource(cms, elementResource).getJSHeadIncludes(
                cms,
                elementResource);
            result.addAll(elementIncludes);
        }
        return result;
    }

}