package org.simantics.interop.stubs;

import org.simantics.db.Resource;
import org.simantics.db.ReadGraph;
import org.simantics.db.request.Read;
import org.simantics.db.Session;
import org.simantics.db.exception.DatabaseException;

public class InteropResource {
    
    public final Resource HasDestination;
    public final Resource HasSource;
    public final Resource ImportLibrary;
        
    public static class URIs {
        public static final String HasDestination = "http://www.simantics.org/Interop-1.0/HasDestination";
        public static final String HasSource = "http://www.simantics.org/Interop-1.0/HasSource";
        public static final String ImportLibrary = "http://www.simantics.org/Interop-1.0/ImportLibrary";
    }
    
    public static Resource getResourceOrNull(ReadGraph graph, String uri) {
        try {
            return graph.getResource(uri);
        } catch(DatabaseException e) {
            System.err.println(e.getMessage());
            return null;
        }
    }
    
    public InteropResource(ReadGraph graph) {
        HasDestination = getResourceOrNull(graph, URIs.HasDestination);
        HasSource = getResourceOrNull(graph, URIs.HasSource);
        ImportLibrary = getResourceOrNull(graph, URIs.ImportLibrary);
    }
    
    public static InteropResource getInstance(ReadGraph graph) {
        Session session = graph.getSession();
        InteropResource ret = session.peekService(InteropResource.class);
        if(ret == null) {
            ret = new InteropResource(graph);
            session.registerService(InteropResource.class, ret);
        }
        return ret;
    }
    
    public static InteropResource getInstance(Session session) throws DatabaseException {
        InteropResource ret = session.peekService(InteropResource.class);
        if(ret == null) {
            ret = session.syncRequest(new Read<InteropResource>() {
                public InteropResource perform(ReadGraph graph) throws DatabaseException {
                    return new InteropResource(graph);
                }
            });
            session.registerService(InteropResource.class, ret);
        }
        return ret;
    }
    
}