Getting current object

[2006 IR Open Dicussion]

By: Morten Kristiansen - mortenkr

Getting current object

2006-05-03 06:43

I'm currently using a Collection with objects as DataSource to a Jasper report. Are there any way to get the current object in this datasource? I need something like $R{currentObject}. The reason for this is that my objects in the Collection, does not have any get methods, but methods like "getValue(String key)". So when displaying values in report i need to do this: $R{current}.getValue("myKey").

[kriegerd]

I'm having the same problem!!... I need the current object in a Pojo datasource. If anyone knows this I would really appreciate it.

 

Thanx in advance

[kriegerd]

I'm kind of desperate here... I'm thinking of declaring a method "getMe()" that returns the current instance, so that I can declare a field "me", and through "me" access the stuff I want to access.

 

Of course, this horrible horrible thing implies messing up my code :( ...

 

Does anyone have a better idea to stop this!!!???

 

Thanx again

[lucianc]

The JR bean collection data source does not support this.

 

However, you could easily extend JRBeanCollectionDataSource to return the current bean for fields mapped to "this" (for instance):

Code:

public class MyBeanCollectionDataSource extends JRBeanCollectionDataSource {
  static final String BEAN_MAPPING = "this";
  protected Object getFieldValue(Object bean, JRField field) throws JRException {
    String prop = getPropertyName(field);
    Object value;
    if (prop.equals(BEAN_MAPPING)) {
      value = bean;
    } else {
      value = super.getFieldValue(bean, field);
    }
    return value;
  }
}

 

HTH,

Lucian

[kriegerd]

thanx.. it's been very useful.

Thanx a lot.

[lucianc]

We have included this functionality in the core JR code. Bean data sources (JRBeanCollectionDataSource and JRBeanArrayDataSource) yield the current bean as value for fields mapped to _THIS (the mapping is case sensitive):

Code:

<field name="_THIS" class="com.domain.MyBean"/>
<!-- OR -->
<field name="myBean" class="com.domain.MyBean">
  <fieldDescription>_THIS</fieldDescription>
</field>

 

This change is currently on the JR SVN trunk and will be part of the next release.

 

Regards,

Lucian