package org.simantics.modeling;

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.common.procedure.adapter.TransientCacheListener;
import org.simantics.db.common.utils.NameUtils;
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 ImmutableComponentVariableBuilder<Node> implements VariableBuilder<Node> {

	@Override
	public Variable buildChild(ReadGraph graph, Variable parent, VariableNode<Node> node, Resource child) throws DatabaseException {
		if(graph.isImmutable(child)) {
			ImmutableComponentVariableContent content = graph.syncRequest(new ImmutableComponentVariableContentRequest(child), TransientCacheListener.instance());
			return new ImmutableComponentVariable(parent, content);
		} else {
			return new StandardGraphChildVariable(parent, node, child);
		}
	}

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

}