Cewolf - PageViewCountData's data

[MichaelJ McCabe]

Sorry for another post about Cewolf, but I'm having one last problem.

My charts are displaying great, and now I want to have access to the data I passed to them,when they are clicked on.

I can get access to the instance of my PageViewCountData class (modified from the tutorial) which was clicked on, but i have NO idea how to use it!

I'm trying to retrieve the DefaultCategoryDataset which is made in produceDataset, but to no avail. Basically, I need to have access to the list created in this class, in whatever format that will make it usable. But at the moment I cant get access to anything in my parent class

I may be showing my lack of general Java Knowledge here, but I'm pretty stuck, and this is pretty important.

Below is code snippets for my PageViewCountData'

  

public class PageViewCountData implements DatasetProducer, CategoryToolTipGenerator, CategoryItemLinkGenerator, Serializable {

	private SpringHibernateDAO springHibernateDAO;
	private String id_in;
	private int channel_in;
	
	
	public PageViewCountData(HttpServletRequest request, Integer id, Integer channel)
	{
		springHibernateDAO = (dashboard.dao.SpringHibernateDAO) ServiceFinder.getContext(request).getBean("SpringHibernateDao");
    	
    	                id_in = Integer.toString(id);
    	                channel_in = channel;
	}

    private static final Log log = LogFactory.getLog(PageViewCountData.class);


    public Object produceDataset(Map params) throws DatasetProduceException {
    	log.debug("producing data.");

        DefaultCategoryDataset dataset = new DefaultCategoryDataset(){
			/**
			 * @see java.lang.Object#finalize()
			 */
			protected void finalize() throws Throwable {
				super.finalize();
				log.debug(this +" finalized.");
			}
        };

    	try
    	{
    		Collection<ReadingsList> list = springHibernateDAO.getData_DRDfromDR( id_in, channel_in);
        	
                	dashboard.web.common.ReadingsList[] readingsList = (dashboard.web.common.ReadingsList[]) list.toArray(new dashboard.web.common.ReadingsList[list.size()]);
        
	        for (int series = 0; series < 96; series ++) {
	
	   	        	int temp = Integer.parseInt(readingsList[series].getCount());
	                               dataset.addValue(temp, "", seriesNames[series]);
	        }
    	}
    	catch (java.sql.SQLException e) 
    	{ 
    		System.out.println("FAIL");
    	}
        return dataset;
    }

    /**
     * This producer's data is invalidated after 5 seconds. By this method the
     * producer can influence Cewolf's caching behaviour the way it wants to.
     */
	public boolean hasExpired(Map params, Date since) {		
        log.debug(getClass().getName() + "hasExpired()");
		return (System.currentTimeMillis() - since.getTime())  > 5000;
	}

	/**
	 * Returns a unique ID for this DatasetProducer
	 */
	public String getProducerId() {
		return "PageViewCountData DatasetProducer";
	}

    /**
     * Returns a link target for a special data item.
     */
    public String generateLink(Object data, int series, Object category) {
        return seriesNames[series];
    }
    
	/**
	 * @see java.lang.Object#finalize()
	 */
	protected void finalize() throws Throwable {
		super.finalize();
		log.debug(this + " finalized.");
	}

	/**
	 * @see org.jfree.chart.tooltips.CategoryToolTipGenerator#generateToolTip(CategoryDataset, int, int)
	 */
	public String generateToolTip(CategoryDataset arg0, int series, int arg2) {
		return seriesNames[series];
	}

[Ulf Dittmer]

If you need access to this object in requests subsequent to the original page generation, then you need to store it in a context that stays around longer - maybe the user's session, or the maybe web app context if this is global data.

You also need to keep a reference to the DataSet around in the class in an instance field, so that you can retrieve it later via some appropriate getter method.

I'm not sure what you mean by "parent class".

[MichaelJ McCabe]

I am keeping the instance in a session -

   
dashboard.services.PageViewCountData PVCDs = new dashboard.services.PageViewCountData(request, i, channelFromMeter);
session.setAttribute("PVCD"+counter,PVCDs);
 

and then

dashboard.services.PageViewCountData PVCDc = (dashboard.services.PageViewCountData)session.getAttribute("PVCD"+i);
 

but I am trying to get the data from PageViewCountData, into a form which can be used (i.e DefaultCategoryDataset, or a list of somekind)

[Ulf Dittmer]

So you're already halfway there. Now instead of

public Object produceDataset(Map params) throws DatasetProduceException {  
...
    DefaultCategoryDataset dataset = new DefaultCategoryDataset(){  
...
}

you want something like

DefaultCategoryDataset dataset = null;

DefaultCategoryDataset getDataset() {
    return dataset;
}

public Object produceDataset(Map params) throws DatasetProduceException {  
...
    dataset = new DefaultCategoryDataset(){  
...
}

so that you can retrieve (and work with) the Dataset object in the code you posted.

[MichaelJ McCabe]

Ok great, I'm hitting more problems though.

I have made a ChartData class, to hold values of what was going INTO my cewolf chart. this is below

    
public class ChartData {

    private String label;
    private int value;
    public ChartData() {

    }
	
	public String getLabel() {
		return label;
	}

	public void setLabel(String label) {
		this.label = label;
	}
	
	public Integer getValue() {
		return value;
	}

	public void setValue(Integer value) {
		this.value = value;
	}
}

Now in my class DropDownsAction, i make a new dataset and retrieve it from my PageViewCountData

dashboard.services.PageViewCountData PVCDc = (dashboard.services.PageViewCountData)session.getAttribute("PVCD"+j);

DefaultCategoryDataset dataset = new DefaultCategoryDataset();
dataset = PVCDc.getDataset();

I then make a new list of ChartData objects so they can be filled with my data

	final List<ChartData> chartDatalist = new ArrayList<ChartData>();
		for (int z = 0; z < 96; z++)
		{
			ChartData chartDataTemp = new ChartData();
							
			chartDataTemp.setLabel("time"+z);
			chartDataTemp.setValue((dataset.getValue(z, 1)).intValue());

			chartDatalist.add(chartDataTemp);
		}

I am hitting problems which I list below. If you could help, I would be so greatful.

1)
I get an error: Index: 1, Size: 1

The data in the cewolf chart is perfect, so I can only assume I'm doing something wrong

and

2)
in the code above I have done chartDataTemp.setLabel("time"+z);
This is only temporary due to a problem that getValue on DefaultCategoryDataset always returns a Number. But I have a Sring in my data set :S

[MichaelJ McCabe]

Ok, I have worked around the two problems by not using DefaultCategoryDataset, and just getting the raw data. Interesting problem though