/* ================================================================

  * Cewolf : Chart enabling Web Objects Framework

  * ================================================================

  *

  * Project Info:  http://cewolf.sourceforge.net

  * Project Lead:  Guido Laures (guido@laures.de);

  *

  * (C) Copyright 2002, by Guido Laures

  *

  * 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 de.laures.cewolf.taglib.tags;

 import java.io.IOException;

 import javax.servlet.jsp.JspException;

 import de.laures.cewolf.CewolfException;

 import de.laures.cewolf.ChartHolder;

 import de.laures.cewolf.ChartImage;

 import de.laures.cewolf.Configuration;

 import de.laures.cewolf.Storage;

 import de.laures.cewolf.WebConstants;

 import de.laures.cewolf.taglib.ChartImageDefinition;

 import de.laures.cewolf.taglib.TaglibConstants;

 import de.laures.cewolf.taglib.html.HTMLImgTag;

 import de.laures.cewolf.taglib.util.PageUtils;

 /**

  * Tag <legend> which can be used to render a chart's legend

  * separately somewhere in the page.

  * @author  Guido Laures

  */

 public class LegendTag extends HTMLImgTag implements CewolfRootTag, TaglibConstants, WebConstants {

     private static final String DEFAULT_MIME_TYPE = MIME_PNG;

     private static final int DEFAULT_TIMEOUT = 300;

     private int timeout = DEFAULT_TIMEOUT;

     private transient String sessionKey;

     private transient String renderer;

     private String mimeType = DEFAULT_MIME_TYPE;

     public int doStartTag() throws JspException {

         ChartHolder cd = PageUtils.getChartHolder(getChartId(), pageContext);

         ChartImage cid = new ChartImageDefinition(cd, width, height, ChartImage.IMG_TYPE_LEGEND, mimeType,timeout);

         Storage storage = Configuration.getInstance(pageContext.getServletContext()).getStorage();

         try {

         	this.sessionKey = storage.storeChartImage(cid, pageContext);

         } catch(CewolfException cwex){

         	log.error(cwex);

         	throw new JspException(cwex.getMessage());

         }

         return SKIP_BODY;

     }

     public int doEndTag() throws JspException {

 		super.doStartTag();

 		final StringBuffer buffer = new StringBuffer(" src=\"");

 		buffer.append(getImgURL());

 		buffer.append("\"");

 		try {

 			pageContext.getOut().write(buffer.toString());

 		} catch (IOException ioex) {

 			reset();

 			log.error(ioex);

 			throw new JspException(ioex.getMessage());

 		}

 		return super.doEndTag();

     }

 	/**

 	* To enable further server side scriptings on JSP output the session ID is always

 	* encoded into the image URL even if cookies are enabled on the client side.

 	*/

 	protected String getImgURL() {

 		return ChartImgTag.buildImgURL(renderer, pageContext, sessionKey, width, height, mimeType, forceSessionId,removeAfterRender);

 	}

     protected void reset() {

         // as of a weird JSP compiler in resin

         // a reused tag's attribute is only set if 

         // it changes. So width an height may not

         // be unset to ensure correct values.

         int lHeight = this.height;

         int lWidth = this.width;

         int lTimeout = this.timeout;

         super.reset();

         this.height = lHeight;

         this.width = lWidth;

         this.timeout = lTimeout;

     }

     public String getChartId() {

         return getId();

     }

     public void setRenderer(String rend) {

         this.renderer = rend;

     }

     /**

      * Sets the mimeType.

      * @param mimeType The mimeType to set

      */

     public void setMime(String mimeType) {

         this.mimeType = mimeType;

     }

     /**

      * @return Returns the timeout.

      */

     public int getTimeout()

     {

       return timeout;

     }

     /**

      * @param timeout The timeout to set.

      */

     public void setTimeout( int timeout )

     {

       this.timeout = timeout;

     }

 }