package org.simantics.modeling.ui.diagram.monitor;

import org.simantics.browsing.ui.swt.widgets.impl.ReadFactoryImpl;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.exception.DatabaseException;
import org.simantics.operation.Layer0X;

public class CurrentExpressionFactory extends ReadFactoryImpl<Resource, String> {

	@Override
	public String perform(ReadGraph graph, Resource monitor) throws DatabaseException {
		
		Layer0X L0X = Layer0X.getInstance(graph);
		String exp = graph.getPossibleRelatedAdapter(monitor, L0X.HasExpression, String.class);
		return exp != null ? exp : "value"; //$NON-NLS-1$
		
	}
	
}