Method: MapIterationObligation(AStarStarBinaryExp, IPOContextStack, IPogAssistantFactory)

1: /*******************************************************************************
2: *
3: *        Copyright (C) 2008 Fujitsu Services Ltd.
4: *
5: *        Author: Nick Battle
6: *
7: *        This file is part of VDMJ.
8: *
9: *        VDMJ is free software: you can redistribute it and/or modify
10: *        it under the terms of the GNU General Public License as published by
11: *        the Free Software Foundation, either version 3 of the License, or
12: *        (at your option) any later version.
13: *
14: *        VDMJ is distributed in the hope that it will be useful,
15: *        but WITHOUT ANY WARRANTY; without even the implied warranty of
16: *        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: *        GNU General Public License for more details.
18: *
19: *        You should have received a copy of the GNU General Public License
20: *        along with VDMJ. If not, see <http://www.gnu.org/licenses/>.
21: *
22: ******************************************************************************/
23:
24: package org.overture.pog.obligation;
25:
26: import org.overture.ast.analysis.AnalysisException;
27: import org.overture.ast.expressions.AIntLiteralExp;
28: import org.overture.ast.expressions.AMapDomainUnaryExp;
29: import org.overture.ast.expressions.AMapRangeUnaryExp;
30: import org.overture.ast.expressions.AOrBooleanBinaryExp;
31: import org.overture.ast.expressions.AStarStarBinaryExp;
32: import org.overture.ast.expressions.ASubsetBinaryExp;
33: import org.overture.pog.pub.IPOContextStack;
34: import org.overture.pog.pub.IPogAssistantFactory;
35: import org.overture.pog.pub.POType;
36:
37: public class MapIterationObligation extends ProofObligation
38: {
39:         private static final long serialVersionUID = -9122478081832322687L;
40:
41:         public MapIterationObligation(AStarStarBinaryExp exp, IPOContextStack ctxt,
42:                         IPogAssistantFactory af) throws AnalysisException
43:         {
44:                 super(exp, POType.MAP_ITERATION, ctxt, exp.getLocation(), af);
45:
46:                 /**
47:                  * The obligation for m ** e is: e = 0 or e = 1 or rng m subset dom m
48:                  */
49:
50:                 AOrBooleanBinaryExp orExp = new AOrBooleanBinaryExp();
51:                 AIntLiteralExp zero = getIntLiteral(0);
52:                 AIntLiteralExp one = getIntLiteral(1);
53:
54:                 orExp.setLeft(getEqualsExp(exp.clone(), zero));
55:                 AOrBooleanBinaryExp orExp2 = new AOrBooleanBinaryExp();
56:                 orExp2.setLeft(getEqualsExp(exp.clone(), one));
57:
58:                 AMapRangeUnaryExp rng = new AMapRangeUnaryExp();
59:                 rng.setExp(exp.getLeft().clone());
60:                 AMapDomainUnaryExp dom = new AMapDomainUnaryExp();
61:                 dom.setExp(exp.getLeft().clone());
62:                 ASubsetBinaryExp subset = new ASubsetBinaryExp();
63:                 subset.setLeft(rng);
64:                 subset.setRight(dom);
65:
66:                 orExp2.setRight(subset);
67:                 orExp.setRight(orExp2);
68:
69:                 stitch = orExp;
70:                 valuetree.setPredicate(ctxt.getPredWithContext(orExp));
71:         }
72: }