package org.simantics.scenegraph.loader;

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.layer0.variable.StandardGraphChildVariable;
import org.simantics.db.layer0.variable.StandardGraphPropertyVariable;
import org.simantics.db.layer0.variable.Variable;
import org.simantics.db.layer0.variable.VariableBuilder;
import org.simantics.db.layer0.variable.VariableNode;

public class SceneGraphVariableBuilder implements VariableBuilder<Object> {

	@Override
	public Variable buildChild(ReadGraph graph, Variable parent,
			VariableNode<Object> node, Resource child) throws DatabaseException {
		SceneGraphContext vc = ScenegraphLoaderUtils.getContext(graph, parent);
		if(vc != null)
			return new ScenegraphVariable(parent, child, null, null);
		else
			return new StandardGraphChildVariable(parent, null, child);
	}

	@Override
	public Variable buildProperty(ReadGraph graph, Variable parent,
			VariableNode<Object> node, Resource subject, Resource predicate)
			throws DatabaseException {
		return new StandardGraphPropertyVariable(graph, parent, null, subject, predicate);
	}

}