package org.simantics.db.tests.common;

import org.simantics.databoard.Bindings;
import org.simantics.db.Resource;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.WriteResultRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.request.WriteResult;
import org.simantics.layer0.Layer0;

public class Writes {
	
	public static WriteResult<Resource> newEmpty() throws DatabaseException {
		return new WriteResultRequest<Resource>() {
		    @Override
		    public Resource perform(WriteGraph g) throws DatabaseException {
		    	return g.newResource();
		    }
		};
	}

    public static Resource named(WriteGraph graph, String name) throws DatabaseException {

        Layer0 b = Layer0.getInstance(graph);
        
        Resource result = graph.newResource();
        graph.claim(result, b.InstanceOf, null, b.Entity);
        graph.claimLiteral(result, b.HasName, name, Bindings.STRING);
        
        return result;
        
    }
    
    public static Resource assertion(WriteGraph graph, Resource predicate, Resource object) throws DatabaseException {

        Layer0 b = Layer0.getInstance(graph);

        // Assert nonfunctional items
        Resource ass = graph.newResource();
        graph.claim(ass, b.InstanceOf, null,  b.Assertion);
        graph.claim(ass, b.HasPredicate, predicate);
        graph.claim(ass, b.HasObject, object);

        return ass;
        
    }

    public static Resource string(WriteGraph graph, String string) throws DatabaseException {

        Layer0 b = Layer0.getInstance(graph);

        // Assert nonfunctional items
        Resource result = graph.newResource();
        graph.claim(result, b.InstanceOf, null,  b.String);
        graph.claimValue(result, string);

        return result;
        
    }
	
}