/*
 * Copyright (C) 2002-2004 Red Hat Inc. All Rights Reserved.
 *
 * 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.
 *
 * 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 com.arsdigita.templating.jsp;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;

/**
 * Specifies the placement of an embedded JSP within the master JSP
 *
 * <p>Usage:</p>
 *
 * <pre><code>&lt;ats:slave />
 **/
public class SlaveTag extends TagSupport {

    public SlaveTag() {

        super();
    }

    public int doEndTag() throws JspTagException {

        HttpServletRequest request =
            (HttpServletRequest) pageContext.getRequest();
        String slavePath =
            (String) request.getAttribute(MasterTag.SLAVE_ATTRIBUTE);

        if (slavePath == null) {
            throw new JspTagException("Slave not found.  " +
                                      "The slave tag is only valid within a master JSP.");
        }

        try {

            pageContext.include(slavePath);

        } catch (Exception e) {

            e.printStackTrace();
            throw new JspTagException(e.getMessage());
        }

        return EVAL_PAGE;
    }
}
