franta-hg@1: /* ================================================================
franta-hg@1:  * Cewolf : Chart enabling Web Objects Framework
franta-hg@1:  * ================================================================
franta-hg@1:  *
franta-hg@1:  * Project Info:  http://cewolf.sourceforge.net
franta-hg@1:  * Project Lead:  Guido Laures (guido@laures.de);
franta-hg@1:  *
franta-hg@1:  * (C) Copyright 2002, by Guido Laures
franta-hg@1:  *
franta-hg@1:  * This library is free software; you can redistribute it and/or modify it under the terms
franta-hg@1:  * of the GNU Lesser General Public License as published by the Free Software Foundation;
franta-hg@1:  * either version 2.1 of
franta-hg@1:  * the License, or (at your option) any later version.
franta-hg@1:  *
franta-hg@1:  * This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
franta-hg@1:  * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
franta-hg@1:  * See the GNU Lesser General Public License for more details.
franta-hg@1:  *
franta-hg@1:  * You should have received a copy of the GNU Lesser General Public License along with this
franta-hg@1:  * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
franta-hg@1:  * Boston, MA 02111-1307, USA.
franta-hg@1:  */
franta-hg@1: 
franta-hg@1: package de.laures.cewolf.taglib.tags;
franta-hg@1: 
franta-hg@1: import java.io.IOException;
franta-hg@1: 
franta-hg@1: import javax.servlet.jsp.JspException;
franta-hg@1: 
franta-hg@1: import de.laures.cewolf.CewolfException;
franta-hg@1: import de.laures.cewolf.ChartHolder;
franta-hg@1: import de.laures.cewolf.ChartImage;
franta-hg@1: import de.laures.cewolf.Configuration;
franta-hg@1: import de.laures.cewolf.Storage;
franta-hg@1: import de.laures.cewolf.WebConstants;
franta-hg@1: import de.laures.cewolf.taglib.ChartImageDefinition;
franta-hg@1: import de.laures.cewolf.taglib.TaglibConstants;
franta-hg@1: import de.laures.cewolf.taglib.html.HTMLImgTag;
franta-hg@1: import de.laures.cewolf.taglib.util.PageUtils;
franta-hg@1: 
franta-hg@1: /**
franta-hg@1:  * Tag <legend> which can be used to render a chart's legend
franta-hg@1:  * separately somewhere in the page.
franta-hg@1:  * @author  Guido Laures
franta-hg@1:  */
franta-hg@1: public class LegendTag extends HTMLImgTag implements CewolfRootTag, TaglibConstants, WebConstants {
franta-hg@1: 
franta-hg@1:     private static final String DEFAULT_MIME_TYPE = MIME_PNG;
franta-hg@1:     private static final int DEFAULT_TIMEOUT = 300;
franta-hg@1:     private int timeout = DEFAULT_TIMEOUT;
franta-hg@1:     private transient String sessionKey;
franta-hg@1:     private transient String renderer;
franta-hg@1:     private String mimeType = DEFAULT_MIME_TYPE;
franta-hg@1: 
franta-hg@1:     public int doStartTag() throws JspException {
franta-hg@1:         ChartHolder cd = PageUtils.getChartHolder(getChartId(), pageContext);
franta-hg@1:         ChartImage cid = new ChartImageDefinition(cd, width, height, ChartImage.IMG_TYPE_LEGEND, mimeType,timeout);
franta-hg@1:         Storage storage = Configuration.getInstance(pageContext.getServletContext()).getStorage();
franta-hg@1:         try {
franta-hg@1:         	this.sessionKey = storage.storeChartImage(cid, pageContext);
franta-hg@1:         } catch(CewolfException cwex){
franta-hg@1:         	log.error(cwex);
franta-hg@1:         	throw new JspException(cwex.getMessage());
franta-hg@1:         }
franta-hg@1:         return SKIP_BODY;
franta-hg@1:     }
franta-hg@1: 
franta-hg@1:     public int doEndTag() throws JspException {
franta-hg@1: 		super.doStartTag();
franta-hg@1: 		final StringBuffer buffer = new StringBuffer(" src=\"");
franta-hg@1: 		buffer.append(getImgURL());
franta-hg@1: 		buffer.append("\"");
franta-hg@1: 		try {
franta-hg@1: 			pageContext.getOut().write(buffer.toString());
franta-hg@1: 		} catch (IOException ioex) {
franta-hg@1: 			reset();
franta-hg@1: 			log.error(ioex);
franta-hg@1: 			throw new JspException(ioex.getMessage());
franta-hg@1: 		}
franta-hg@1: 		return super.doEndTag();
franta-hg@1:     }
franta-hg@1: 
franta-hg@1: 	/**
franta-hg@1: 	* To enable further server side scriptings on JSP output the session ID is always
franta-hg@1: 	* encoded into the image URL even if cookies are enabled on the client side.
franta-hg@1: 	*/
franta-hg@1: 	protected String getImgURL() {
franta-hg@1: 		return ChartImgTag.buildImgURL(renderer, pageContext, sessionKey, width, height, mimeType, forceSessionId,removeAfterRender);
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1:     protected void reset() {
franta-hg@1:         // as of a weird JSP compiler in resin
franta-hg@1:         // a reused tag's attribute is only set if 
franta-hg@1:         // it changes. So width an height may not
franta-hg@1:         // be unset to ensure correct values.
franta-hg@1:         int lHeight = this.height;
franta-hg@1:         int lWidth = this.width;
franta-hg@1:         int lTimeout = this.timeout;
franta-hg@1:         super.reset();
franta-hg@1:         this.height = lHeight;
franta-hg@1:         this.width = lWidth;
franta-hg@1:         this.timeout = lTimeout;
franta-hg@1:     }
franta-hg@1: 
franta-hg@1:     public String getChartId() {
franta-hg@1:         return getId();
franta-hg@1:     }
franta-hg@1: 
franta-hg@1:     public void setRenderer(String rend) {
franta-hg@1:         this.renderer = rend;
franta-hg@1:     }
franta-hg@1: 
franta-hg@1:     /**
franta-hg@1:      * Sets the mimeType.
franta-hg@1:      * @param mimeType The mimeType to set
franta-hg@1:      */
franta-hg@1:     public void setMime(String mimeType) {
franta-hg@1:         this.mimeType = mimeType;
franta-hg@1:     }
franta-hg@1: 
franta-hg@1:     /**
franta-hg@1:      * @return Returns the timeout.
franta-hg@1:      */
franta-hg@1:     public int getTimeout()
franta-hg@1:     {
franta-hg@1:       return timeout;
franta-hg@1:     }
franta-hg@1:     /**
franta-hg@1:      * @param timeout The timeout to set.
franta-hg@1:      */
franta-hg@1:     public void setTimeout( int timeout )
franta-hg@1:     {
franta-hg@1:       this.timeout = timeout;
franta-hg@1:     }
franta-hg@1: }