package org.apache.turbine.services.jsp.tags;

/* ====================================================================
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
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 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
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 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

import java.io.IOException;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.TagSupport;

/**
 * Supporting class for the bodyAttributes tag.
 * Sends the contents of the a screen's body tag's attributes
 * parameter to the output stream.  If the screen did not set
 * the attributes parameter, a default may be used if specified
 * in this tag.  Example usage:
 * &lt;body &lt;x:bodyAttributes default='onLoad="jsfunc()"' /&gt;&gt;
 *
 * @author <a href="mailto:john.mcnally@clearink.com">John D. McNally</a>
 */
public class BodyAttributesTag extends TagSupport 
{
    /** 
     * The default body tag attributes, if none is specified in the screen. 
     */
    private String def;
    
    /** 
     * The setter for the default body tag attributes. 
     */
    public void setDefault(String def)
    {
        this.def = def;
    }
    
    /**
     * Method called when the tag is encountered to send attributes to the
     * output stream
     *
     * @return SKIP_BODY, as it is intended to be a single tag.
     */
    public int doStartTag() throws JspException 
    {
        String bodyAttributes = (String)pageContext
            .getAttribute(BodyTag.ATTRIBUTES, PageContext.REQUEST_SCOPE);
        try 
        {
            if (bodyAttributes != null)
            {
                pageContext.getOut().print(bodyAttributes);
            }
            else
            {
                pageContext.getOut().print(def);
            }
        }
        catch(java.io.IOException ex) 
        {
            throw new JspException(ex.getMessage());
        }
        return SKIP_BODY;
    }
}