/*
* This library is part of OpenCms -
* the Open Source Content Management System
*
* Copyright (c) Alkacon Software GmbH (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.jsp;
import org.opencms.util.CmsRequestUtil;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.tagext.TagSupport;
/**
* A tag to prevent caching by the browser.<p>
*
* This tag must be used before any other output is written by a JSP.<p>
*
* @since 8.0.0
*/
public class CmsJspTagNoCache extends TagSupport {
/** Serial version id. */
private static final long serialVersionUID = -3571347942237415254L;
/**
* @see javax.servlet.jsp.tagext.Tag#doStartTag()
*/
@Override
public int doStartTag() {
ServletResponse res = pageContext.getResponse();
if (res instanceof HttpServletResponse) {
CmsRequestUtil.setNoCacheHeaders((HttpServletResponse)pageContext.getResponse());
}
return SKIP_BODY;
}
}