/**
 * This file Copyright (c) 2003-2012 Magnolia International
 * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
 *
 *
 * This file is dual-licensed under both the Magnolia
 * Network Agreement and the GNU General Public License.
 * You may elect to use one or the other of these licenses.
 *
 * This file is distributed in the hope that it will be
 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
 * Redistribution, except as permitted by whichever of the GPL
 * or MNA you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or
 * modify this file under the terms of the GNU General
 * Public License, Version 3, as published by the Free Software
 * Foundation.  You should have received a copy of the GNU
 * General Public License, Version 3 along with this program;
 * if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 2. For the Magnolia Network Agreement (MNA), this file
 * and the accompanying materials are made available under the
 * terms of the MNA which accompanies this distribution, and
 * is available at http://www.magnolia-cms.com/mna.html
 *
 * Any modifications to this file must keep this entire header
 * intact.
 *
 */
package info.magnolia.freemarker.loaders;

import freemarker.cache.TemplateLoader;
import freemarker.cache.WebappTemplateLoader;
import info.magnolia.context.MgnlContext;
import info.magnolia.context.WebContext;

import javax.servlet.ServletContext;

/**
 * Wrapper for Freemarker WebappTemplateLoader to allow configuration of the loader via content2bean
 * with lazy initialization at runtime (as soon as a ServletContext is available).
 *
 * @author had
 */
public class LazyWebappTemplateLoader extends AbstractDelegatingTemplateLoader {
    @Override
    protected TemplateLoader newDelegate() {
        final WebContext webCtx = MgnlContext.getWebContextOrNull();
        if (webCtx != null) {
            final ServletContext sc = webCtx.getServletContext();
            if (sc != null) {
                return new WebappTemplateLoader(sc, "");
            }
        }
        return null;
    }
}