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 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.util;
franta-hg@1: 
franta-hg@1: import javax.servlet.jsp.PageContext;
franta-hg@1: import javax.servlet.jsp.tagext.Tag;
franta-hg@1: 
franta-hg@1: import org.jfree.data.general.Dataset;
franta-hg@1: 
franta-hg@1: import de.laures.cewolf.ChartHolder;
franta-hg@1: import de.laures.cewolf.DatasetProduceException;
franta-hg@1: import de.laures.cewolf.taglib.tags.CewolfRootTag;
franta-hg@1: 
franta-hg@1: /**
franta-hg@1:  * Helper class to easily retrieve some objects of page context.
franta-hg@1:  * @author  glaures
franta-hg@1:  */
franta-hg@1: public class PageUtils {
franta-hg@1:     
franta-hg@1:     private final static String TOOLTIPS_ENABLED_ATTR = PageUtils.class.getName() + ".ttenabled";
franta-hg@1:     
franta-hg@1:     /** Creates a new instance of ChartDefinitionFactory */
franta-hg@1:     private PageUtils() {}
franta-hg@1:     
franta-hg@1:     public static ChartHolder getChartHolder(String chartId, PageContext ctx){
franta-hg@1:         return (ChartHolder)ctx.getAttribute(chartId, PageContext.PAGE_SCOPE);
franta-hg@1:     }
franta-hg@1:     
franta-hg@1:     public static final ChartHolder getChartHolder(Tag tag, PageContext ctx){
franta-hg@1:         CewolfRootTag root = findRoot(tag, ctx);
franta-hg@1:         if(root instanceof ChartHolder){
franta-hg@1:             return (ChartHolder)root;
franta-hg@1:         } else {
franta-hg@1:             return getChartHolder(root.getChartId(), ctx);
franta-hg@1:         }
franta-hg@1:     }
franta-hg@1:     
franta-hg@1:     public static final Dataset getDataset(String chartId, PageContext ctx) throws DatasetProduceException {
franta-hg@1:         return (Dataset) getChartHolder(chartId, ctx).getDataset();
franta-hg@1:     }
franta-hg@1: 
franta-hg@1:     public static final CewolfRootTag findRoot(Tag t, PageContext ctx){
franta-hg@1:         Tag res = t;
franta-hg@1:         while(!(res instanceof CewolfRootTag)){
franta-hg@1:             res = res.getParent();
franta-hg@1:         }
franta-hg@1:         return (CewolfRootTag)res;
franta-hg@1:     }
franta-hg@1:     
franta-hg@1:     public static final void setToolTipsEnabled(PageContext ctx){
franta-hg@1:         if(!isToolTipsEnabled(ctx)){
franta-hg@1:             ctx.setAttribute(TOOLTIPS_ENABLED_ATTR, "true", PageContext.PAGE_SCOPE);
franta-hg@1:         }
franta-hg@1:     }
franta-hg@1:     
franta-hg@1:     public static final boolean isToolTipsEnabled(PageContext ctx){
franta-hg@1:         return ctx.getAttribute(TOOLTIPS_ENABLED_ATTR, PageContext.PAGE_SCOPE) != null;
franta-hg@1:     }
franta-hg@1:     
franta-hg@1: }