/*
* #%~
* 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.analysis.AnswerAdaptor;
import org.overture.ast.node.INode;
import org.overture.ast.types.ABracketType;
import org.overture.ast.types.ANamedInvariantType;
import org.overture.ast.types.AOptionalType;
import org.overture.ast.types.AUnionType;
import org.overture.ast.types.SInvariantType;
import org.overture.typechecker.assistant.ITypeCheckerAssistantFactory;
/**
* Used to determine if a type is a Union type
*
* @author kel
*/
public class UnionBasisChecker extends AnswerAdaptor<Boolean>
{
protected ITypeCheckerAssistantFactory af;
public UnionBasisChecker(ITypeCheckerAssistantFactory af)
{
this.af = af;
}
@Override
public Boolean caseABracketType(ABracketType type) throws AnalysisException
{
return type.getType().apply(THIS);
}
@Override
public Boolean caseANamedInvariantType(ANamedInvariantType type)
throws AnalysisException
{
if (type.getOpaque())
{
return false;
}
return type.getType().apply(THIS);
}
@Override
public Boolean defaultSInvariantType(SInvariantType node)
throws AnalysisException
{
return false;
}
@Override
public Boolean caseAUnionType(AUnionType type) throws AnalysisException
{
return true;
}
@Override
public Boolean createNewReturnValue(INode node) throws AnalysisException
{
return false;
}
@Override
public Boolean createNewReturnValue(Object node) throws AnalysisException
{
return false;
}
@Override
public Boolean caseAOptionalType(AOptionalType node)
throws AnalysisException
{
return node.getType().apply(THIS);
}
}