UnionTypeFinder.java

/*
 * #%~
 * The VDM Type Checker
 * %%
 * Copyright (C) 2008 - 2014 Overture
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public
 * License along with this program.  If not, see
 * <http://www.gnu.org/licenses/gpl-3.0.html>.
 * #~%
 */
package org.overture.typechecker.utilities.type;

import org.overture.ast.analysis.AnalysisException;
import org.overture.ast.types.ANamedInvariantType;
import org.overture.ast.types.AUnionType;
import org.overture.ast.types.PType;
import org.overture.ast.types.SInvariantType;
import org.overture.typechecker.assistant.ITypeCheckerAssistantFactory;

/**
 * Used to get a Union type from a type
 * 
 * @author kel
 */
public class UnionTypeFinder extends TypeUnwrapper<AUnionType>
{

	protected ITypeCheckerAssistantFactory af;

	public UnionTypeFinder(ITypeCheckerAssistantFactory af)
	{
		this.af = af;
	}

	@Override
	public AUnionType defaultSInvariantType(SInvariantType type)
			throws AnalysisException
	{
		if (type instanceof ANamedInvariantType)
		{
			return ((ANamedInvariantType) type).getType().apply(THIS);
		} else
		{
			return null;
		}
	}

	@Override
	public AUnionType caseAUnionType(AUnionType type) throws AnalysisException
	{
		return type;
	}

	@Override
	public AUnionType defaultPType(PType type) throws AnalysisException
	{
		assert false : " cannot getUnion from non-union";
		return null;
	}
}