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