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Web Service Data Source?

I'm evaluating Pentaho Report Designer 1.2.0 and I want to get my data from a web service which I have already written.

Just implement a class that has a static method that returns a javax.swing.table.TableModel.

Code:

package org.someorganization.datasources;
...
public class TestDataSource {
    public static TableModel createTestData() {
        ....
    }
}