Get Value from Parameter in DatasourceProvider

[carsten07]

Hi, i'm evaluating ireport and i have a problem with my own Datasourceprovider. How can i access a report parameter in the datasourceprovider?

Here is the code:

Code:

public class MyDatasourceProvider extends JRAbstractBeanDataSourceProvider
{
  private static Logger log =   
   Logger.getLogger(MyDatasourceProvider.class);

  public MyDatasourceProvider()
  {
    super(Test.class);
  }

  /* 
   * @see net.sf.jasperreports.engine.JRDataSourceProvider#create(net.sf.jasperreports.engine.JasperReport)
   */
  public JRDataSource create(JasperReport report) throws JRException
  {
    Collection collection = null;
    JRParameter[] param =  report.getParameters();
    log.debug("Param: " + param.length);
    for(int i=0;i<param.length;i++)
    {   
      log.debug("Param[" + i + "]: " + param.getName());
      log.debug("Paramclass[" + i + "]: " + param.getClass());
      log.debug("Paramvclass[" + i + "]: " + param.getValueClass());
      log.debug("Param[" + i + "]: " + param.getDescription());
      log.debug("Param[" + i + "]: " + param.getDefaultValueExpression());
    }  
    return new JRBeanCollectionDataSource(collection);
  }

  /* 
   * @see net.sf.jasperreports.engine.JRDataSourceProvider#dispose(net.sf.jasperreports.engine.JRDataSource)
   */
  public void dispose(JRDataSource arg0) throws JRException
  {
  }

 

I see the params but i've no idea how to access them?

 

Thanks in advance

 

Carsten

[carsten07]

Has nobody an idea?

[martynhiemstra]

This should be a plain and simple Java solution

 

Add

Code:

private JRParameter[] params = null;

to the class.

 

In your create method dont say

Code:

[code]JRParameter[] param = report.getParameters();

but say

Code:

[code]this.params = report.getParameters();

 

Then create a getParams() method that returns the param array or create a method getParam(String name) that returns a param with a certain name.

 

Or would you like to find out how to access the parameters from your report?

 

Post edited by: martynhiemstra, at: 2007/03/01 07:19

Post edited by: martynhiemstra, at: 2007/03/01 07:41

[carsten07]

Thank you for your post,

but my problem is not to get a parameter.

I've no idea how to access the value from a parameter.

 

Carsten

[lukemcar]

I am trying to do the same thing. I have tryed many things but none have worked. Here is my latest attempt

 

Code:

public class MyDataSourceProvider extends JRAbstractBeanDataSourceProvider{

// some code

	public JRDataSource create(JasperReport report) throws JRException 
	{
		Object clubName = getParameterValue(report, "clubName"«»);
                // some code
		JRBeanArrayDataSource beanDataSource = new JRBeanArrayDataSource(this.items.toArray());
		return beanDataSource;
	}
	
	public static Object getParameterValue(JasperReport report, String paramName)
	{
		JRParameter[] param = report.getParameters();
		if(param != null)
		{
			for(int i = 0; i < param.length; ++i)
			{
				if(paramName.equals(param.getName()))
				{
					if(param instanceof JRValueParameter)
					{
						return ((JRValueParameter)param).getValue();
					}		
				}
			}
			
			return "no value";
		}
		else
		{
			return "getParameters is Null";
		}
	}
}

 

This last attempt seemed to be the most promising, but it seams that none of the parameters are of type JRValueParameter. If I find a solution I’ll post it.

[jinal]

I am facing the same problem. Has anybody got the solution for this?

 

Thanks.

 

Jinal