passing parameters to Cewolf constructor??

[luis Fernandez]

Hello!

i have decided to use cewolf and JFreeChart.

I want to make graphs, but i cannot find nothing about passing parameters to produceDataset in order to dinamically create mysql querys. (i have looked through the api, this forum and half internet )

i am very stuck with this.. i have a jsp, and i call cewolf constructor:

.java:

  public class ReFinalesGraficas implements DatasetProducer, Serializable{
public Object produceDataset(Map params){
..  

Map params is supposed to be filled in previous .jsp... how??

Thanks a lot

[luis Fernandez]

please, how can i get parameters through "Map params"?

what do i set in the jsp??

thanks!

[Ulf Dittmer]

For starters, I wouldn't do that in the JSP. Code like that should live in a servlet class or backing bean.

The tutorial on http://cewolf.sourceforge.net/ shows how to assemble the various components that make a cewolf chart. It doesn't cover DB access, though, since that's outside of the realm of JFreeChart/cewolf.

If you're serious about cewolf, I'd suggest to start out with the version I released; it fixes a number of problems and adds a few new features to cewolf.

[luis Fernandez]

Hi!

i have been working with Cewolf and i have the next problem:

.jsp:

 <% 
      for(j=0;j<15;j++){
 
idPoll = polls[j].getIdPoll();
ChartsIntro seriesProducer = new ChartsIntro();
seriesProducer.setIdPoll(idPoll);
request.setAttribute("getViews", seriesProducer);
%>
                <cewolf:chart id="pieChart" type="pie">
                <cewolf:Data>
                    <cewolf:producer usecache="false" id="getViews">
                    </cewolf:producer>
                </cewolf:Data>
                </cewolf:chart>
                <cewolf:img removeAfterRender="true" chartid="pieChart" renderer="/cewolf" alt="not available" align="right" width="240" height="118"/>
 
<%
 } //End for
%>
   

.java

  
public class ChartsIntro implements DatasetProducer, Serializable {
private int IdEncuesta;
 
public ChartsIntro(){
this.IdPoll = ..;
//Set and get's properties..
}
 
 public Object produceDataset(Map params){
DefaultPieDataset pieDataset = new DefaultPieDataset();
 
pieDataset.setValue("someInfo", IdPoll);
 
System.out.println("I enter in produceDataset with: " + IdPoll);
 
return pieDataset;
 
}
 
public boolean hasExpired(Map params, Date since) {
        return false;
    }
 
  

(This is a simplified example to show my case)

It draws those 15 charts with the id's (ids randoms): 1,2,2,2,2,2,2,2,9,9,9,9,14,14,14

The affair is .. in this case, only enters 4 times on the produceDataset, why? should be 15 !


PD: Ulf Dittmer, i am not going much further with Cewolf and i need basic usage only, improvements in your Cewolf does not help me much on this problem. Thanks
[ June 23, 2008: Message edited by: luis Fernandez ]

[Ulf Dittmer]

It gets called 4 times ... there are 4 different IDs ... hmmm.

[luis Fernandez]

Solved,

i had not every "de.laures" packages imported properly..

removeAfterRender="true" and usecache="false" were also important.

thanks