package org.simantics.backup.ontology;

import org.simantics.db.RequestProcessor;
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;
import org.simantics.db.service.QueryControl;

public class BackupResource {
    
    public final Resource ModelledBackupProvider;
    public final Resource ModelledBackupProvider_instance;
    public final Resource ModelledBackupProvider_instance_Inverse;
    public final Resource SCLMain;
    public final Resource modelledBackupProvider;
        
    public static class URIs {
        public static final String ModelledBackupProvider = "http://www.simantics.org/Backup-1.0/ModelledBackupProvider";
        public static final String ModelledBackupProvider_instance = "http://www.simantics.org/Backup-1.0/ModelledBackupProvider/instance";
        public static final String ModelledBackupProvider_instance_Inverse = "http://www.simantics.org/Backup-1.0/ModelledBackupProvider/instance/Inverse";
        public static final String SCLMain = "http://www.simantics.org/Backup-1.0/SCLMain";
        public static final String modelledBackupProvider = "http://www.simantics.org/Backup-1.0/modelledBackupProvider";
    }
    
    public static Resource getResourceOrNull(ReadGraph graph, String uri) {
        try {
            return graph.getResource(uri);
        } catch(DatabaseException e) {
            System.err.println(e.getMessage());
            return null;
        }
    }
    
    public BackupResource(ReadGraph graph) {
        ModelledBackupProvider = getResourceOrNull(graph, URIs.ModelledBackupProvider);
        ModelledBackupProvider_instance = getResourceOrNull(graph, URIs.ModelledBackupProvider_instance);
        ModelledBackupProvider_instance_Inverse = getResourceOrNull(graph, URIs.ModelledBackupProvider_instance_Inverse);
        SCLMain = getResourceOrNull(graph, URIs.SCLMain);
        modelledBackupProvider = getResourceOrNull(graph, URIs.modelledBackupProvider);
    }
    
    public static BackupResource getInstance(ReadGraph graph) {
        Session session = graph.getSession();
        BackupResource ret = session.peekService(BackupResource.class);
        if(ret == null) {
            QueryControl qc = graph.getService(QueryControl.class);
            ret = new BackupResource(qc.getIndependentGraph(graph));
            session.registerService(BackupResource.class, ret);
        }
        return ret;
    }
    
    public static BackupResource getInstance(RequestProcessor session) throws DatabaseException {
        BackupResource ret = session.peekService(BackupResource.class);
        if(ret == null) {
            ret = session.syncRequest(new Read<BackupResource>() {
                public BackupResource perform(ReadGraph graph) throws DatabaseException {
                    QueryControl qc = graph.getService(QueryControl.class);
                    return new BackupResource(qc.getIndependentGraph(graph));
                }
            });
            session.registerService(BackupResource.class, ret);
        }
        return ret;
    }
    
}