Bug 135254 "Test connection" should be disabled after cancelling "Manage Drivers" window
Steps to reproduce: 1.New a JDBC data source 2.Before enter Driver class/URL, notice that "Test Connection" is disabled 3.Click "Manage Drivers", and then cancel it Expected result: "Test Connection" is disabled Actual result: "Test Connection" is enabled
data/org.eclipse.birt.report.data.oda.jdbc.ui/src/org/eclipse/birt/report/data/oda/jdbc/ui/profile/JDBCSelectionPageHelper.java
return ( (JDBCDriverInformation) driverChooserCombo.getElementAt( i ) ).getDriverClassName( );
				}
			}
		}
		
		return driverName;
	}
	
	/**
	 * Validates the data source and updates the window message accordingly
	 * @return
	 */
	private boolean isValidDataSource( )
	{
		return isURLBlank();
	}
	/**
	 *	Test if the input URL is blank 
	 *
	 * @return true url is blank
	 */
	private boolean isURLBlank()
	{
		String value = jdbcUrl.getText( );
		if ( value == null )
			return false;
		value = value.trim( );
		if ( value.length( ) == 0 )
			return false;
		return true;