question: @ Override public boolean connectionAllowed ( String eventName ) { if ( eventName . compareTo ( "trainingSet" ) == 0 && ( m_trainingProvider != null || m_dataProvider != null || m_instanceProvider != null ) ) { return false ; } if ( eventName . compareTo ( "testSet" ) == 0 && m_testProvider != null ) { return false ; } if ( eventName . compareTo ( "instance" ) == 0 && m_instanceProvider != null || m_trainingProvider != null || m_dataProvider != null ) { return false ; } return true ; }
target:  Returns true if, at this time, the object will accept a connection according to the supplied event name