package org.simantics.charts.export;

import java.util.Collection;

import org.simantics.charts.ontology.ChartResource;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.request.Read;
import org.simantics.export.core.ExportContext;
import org.simantics.export.core.error.ExportException;
import org.simantics.export.core.intf.DiscoverAction;
import org.simantics.export.core.util.ExportQueries;

public class ChartsDiscoverer implements DiscoverAction {

	public Read<Collection<String>> discoverRequest(
			final Collection<String> startLocations) throws ExportException {
		return ExportQueries.instancesOf(startLocations, ChartResource.URIs.Chart);			
	}
	
	@Override
	public Collection<String> discoverContent(ExportContext ctx, Collection<String> startLocations) throws ExportException {		
		try {
			return ctx.session.syncRequest( discoverRequest(startLocations) );
		} catch (DatabaseException e) {
			if ( e.getCause() instanceof ExportException ) throw (ExportException) e.getCause();
			throw new ExportException( e );
		}
	}
	

}