Accessing XPages Data Source in a Plugin - xpages

Question

For a plugin (like the extension library) I try to access the datasource with a given "var" name. Accessing the Datasource object is very easy with the following code:
m_DataSourceName contains the name (var) of the datasource.
public DataSource getDataSource() {
if (StringUtil.isNotEmpty(m_DataSourceName)) {
UIViewRoot vrCurrent = getFacesContext().getViewRoot();
if (vrCurrent instanceof UIViewRootEx) {
for (DataSource dsCurrent : ((UIViewRootEx) vrCurrent)
.getData()) {
if (m_DataSourceName.equals(dsCurrent.getVar())) {
return dsCurrent;
}
}
}
}
System.out.println("Datasource name:" + m_DataSourceName);
return null;
}
I'm getting the datasource back and I can cast this datasource:
private TabularDataModel getTDM(DataSource dsCurrent, FacesContext context) {
try {
if (dsCurrent instanceof ModelDataSource) {
ModelDataSource mds = (ModelDataSource) dsCurrent;
AbstractDataSource ads = (AbstractDataSource) mds;
ads.load(context);
System.out.println(ads.getBeanId());
if (ads.getBeanId() == null) {
}
DataModel tdm = mds.getDataModel();
if (tdm instanceof TabularDataModel) {
TabularDataModel tds = (TabularDataModel) tdm;
return tds;
}
}
return null;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
And now I wanna access the TDM.getRowCount() and this point I'm getting a nullpointer exception. The datasource contains a notes view. Did I miss anything to initialize the datasource?

Answer 1

Here is a solution for your problem:
This will give you all lines of a view, not the entry count*. F.e. if you have a categorized view with 5 categories and 1 entry for each category, this will result in 10 lines. The entry count is 5.
First, create a dummy class which implements FacesDataIterator
public class DummyDataIterator implements com.ibm.xsp.component.FacesDataIterator{
public DataModel getDataModel() {
return null;
}
public int getFirst() {
return 0;
}
public int getRowIndex() {
return 0;
}
public int getRows() {
return 0;
}
public void setFirst(int paramInt) {}
public void setRows(int paramInt) {}
}
And then you have to do the following:
Set the data iterator
tdm.setDataControl( new DummyDataIterator() );
Init the row counter for the first time
tdm.getRowCount();
Calculate the exact row count with a navigator
(( com.ibm.xsp.model.domino.viewnavigator.NOIViewNavigatorEx) tdm.getDominoViewDataContainer().getNavigator()).calculateExactCount(tdm.getView());
Now your row count is initialized, you can get the result with a normal getRowCount:
System.out.println("Rows: " + tdm.getRowCount() );
Hope this helps!
*:
tdm.getView().getAllEntries().getCount()