Bug 206279 Removed computed cols listed in expression builder[07]
Description: Removed computed column listed in expression builder inside DataSet Editor dialog Build number:2.2.2.v20071011 Steps to reproduce: 1. New data source and dataset. 2. Add a computed column in dataset and click OK. 3. Open the dataset, remove the computed column. 4. Add a new computed column and check columns in available Data Sets. Expected result: The removed computed column isn't there. Actual result: The removed computed column is still there for selection. Error log:n/a
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/util/DataSetProvider.java
*/
	public static IConfigurationElement findDataSourceElement(
			String dataSourceType )
	{
		assert ( dataSourceType != null );
		
		IConfigurationElement element = (IConfigurationElement) htDataSourceExtensions.get( dataSourceType );
		if ( element == null )
		{
			IConfigurationElement[] elements = Platform.getExtensionRegistry( )
					.getConfigurationElementsFor( "org.eclipse.birt.report.designer.ui.odadatasource" );
			for ( int n = 0; n < elements.length; n++ )
			{
				if ( elements[n].getAttribute( "id" ).equals( dataSourceType ) ) 
				{
					element = elements[n];
					htDataSourceExtensions.put( dataSourceType, element );
					break;
				}
			}
			elements = Platform.getExtensionRegistry( )
					.getConfigurationElementsFor( "org.eclipse.datatools.connectivity.oda.design.ui.dataSource" );
			for ( int n = 0; n < elements.length; n++ )
			{
				if ( elements[n].getAttribute( "id" ).equals( dataSourceType ) ) 
				{
					element = elements[n];
					htDataSourceExtensions.put( dataSourceType, element );
					break;
				}