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/*******************************************************************************
 *
 *	Copyright (c) 2016 Fujitsu Services Ltd.
 *
 *	Author: Nick Battle
 *
 *	This file is part of VDMJ.
 *
 *	VDMJ 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.
 *
 *	VDMJ 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 VDMJ.  If not, see .
 *	SPDX-License-Identifier: GPL-3.0-or-later
 *
 ******************************************************************************/

package com.fujitsu.vdmj.po.expressions;

import com.fujitsu.vdmj.lex.LexLocation;
import com.fujitsu.vdmj.po.expressions.visitors.POExpressionVisitor;
import com.fujitsu.vdmj.pog.NonEmptySetObligation;
import com.fujitsu.vdmj.pog.POContextStack;
import com.fujitsu.vdmj.pog.ProofObligationList;
import com.fujitsu.vdmj.tc.types.TCSet1Type;
import com.fujitsu.vdmj.tc.types.TCTypeQualifier;
import com.fujitsu.vdmj.typechecker.Environment;

public class PODistIntersectExpression extends POUnaryExpression
{
	private static final long serialVersionUID = 1L;

	public PODistIntersectExpression(LexLocation location, POExpression exp)
	{
		super(location, exp);
	}

	@Override
	public String toString()
	{
		return "(dinter " + exp + ")";
	}

	@Override
	public ProofObligationList getProofObligations(POContextStack ctxt, Environment env)
	{
		ProofObligationList obligations = super.getProofObligations(ctxt, env);
		
		if (!exp.getExptype().isAlways(TCSet1Type.class, location))
		{
			obligations.add(new NonEmptySetObligation(exp, ctxt));
		}
		
		return obligations;
	}

	@Override
	public  R apply(POExpressionVisitor visitor, S arg)
	{
		return visitor.caseDistIntersectExpression(this, arg);
	}

	@Override
	protected TCTypeQualifier getQualifier()
	{
		return TCTypeQualifier.getSetQualifier();
	}
}