How to retreive the value of an entered parameter in JRDataSource implementation?

[ward.vantichelen]

I have created a MyCustomDataSource that implements the JRDataSource interface. This data source will call a webservice to retreive the data. The end user must be able to enter some parameters. In the report designer in JasperSoft Studio I've created the parameter with a name MYPARAMETER1 and MYPARAMETER2 as an example.

These parameters must be passed to the webservice call.

Do do this I've implemented a myCustomDataSourceProvider that implements the JRDataSourceProvider interface. With this I can pass the JasperReport to the MyCustomerDataSource.

@Override

public JRDataSource create(JasperReport arg0) throws JRException 

{

   return new MyCustomDataSource(arg0);

}

 

Inside the constructor of MyCustomDataSource I try to read out the values of the entered parameters, but I am unable to do that.

 

public MyCustomDataSource(JasperReport jrreport){

  String myParameter1Value = "";

   //Retrieving the array of parameters:

   JRParameter[] params = jrreport.getParameters();

   for(JRParameter param : params) {

       if(param.getName().equals("MYPARAMETER1"))  {

          //here I can retreive a lot of information of the parameter, but not the actual entered value:

          String description = param.getDescription();//works fine

          String defaultValue = param.getDefaultValueExpression();//works fine (and I can use this for hidden parameters) 

          //the following statement does not work (does not even compile), but I actually need something like this

          //myParameter1Value = param.getValue();          

       }

   }

} 

 

So my question is: how can I retreive the value of an entered parameter in my customer data source? 

This seems to be a very straightforward functionality and I've seen several similar posts like this, but none of them were answered.

[hozawa]

Following wiki page may provide you with information.

http://community.jaspersoft.com/wiki/adding-filter-custom-datasource