Building Data Mining Tools Using JDM - Java Data Mining: Strategy, Standard, and Practice - page 347

19. setDatasetSettingsEnabled(false);

20. throw new UnexpectedJDMException(lException);

21. }

22.}

The call to setDatasetSettingsEnabled at line 4 enables the buttons
Check, Stats, and Build Model because the connection has just been
established with the DME. In line 5, getSupportedFunctions returns the
list of supported functions. Each mining function is then processed to
enable its associated pane (sometimes called a tab in other environ-
ments) corresponding to the proper build settings. Once this is done,
we also validate the default URI through the call of handlerCheck-
DataSet .

13.3.2 Getting the Metadata

When the user hits RETURN after changing the Physical Dataset URI text
field, or when clicking on the Check button when creating the connec-
tion, the handlerCheckDataSet operation is performed as shown here:

1. private void handlerCheckDataSet() {
2. try {

3. setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));

4. createDatasetAndImportMetaData(mPhysicalDataset.getText());

String[] lAttributesNames getAttributeNames();

5.

6. // Comment the following line if you want the natural order

7. Arrays.sort(lAttributesNames);

8. populateCombos(lAttributesNames);

9. } catch (UnexpectedJDMException lException) {

10. JOptionPane.showMessageDialog(this, "Exception Occured: "

lException.getMessage());

11.

12. } finally {

13. setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));

14. }

15.}

At line 3, we set the cursor to a shape indicating that the user must
wait because the metadata retrieval may take a while, for example,
when the connection to a database must be initialized. The cursor is
reset to its original shape at line 13.
Once the metadata has been populated, the list of attributes can
be retrieved from the PhysicalDataSet. This list is used to update a