Source Code Cross Referenced for MetaAdd.java in  » Testing » KeY » de » uka » ilkd » key » rule » metaconstruct » arith » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » KeY » de.uka.ilkd.key.rule.metaconstruct.arith 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        // This file is part of KeY - Integrated Deductive Software Design
02:        // Copyright (C) 2001-2007 Universitaet Karlsruhe, Germany
03:        //                         Universitaet Koblenz-Landau, Germany
04:        //                         Chalmers University of Technology, Sweden
05:        //
06:        // The KeY system is protected by the GNU General Public License. 
07:        // See LICENSE.TXT for details.
08:        //
09:        //
10:        package de.uka.ilkd.key.rule.metaconstruct.arith;
11:
12:        import java.math.BigInteger;
13:
14:        import de.uka.ilkd.key.java.Services;
15:        import de.uka.ilkd.key.java.expression.literal.IntLiteral;
16:        import de.uka.ilkd.key.logic.Name;
17:        import de.uka.ilkd.key.logic.Term;
18:        import de.uka.ilkd.key.logic.op.AbstractMetaOperator;
19:        import de.uka.ilkd.key.rule.inst.SVInstantiations;
20:
21:        /** this class implements the interface for
22:         * MetaAdderators. MetaAdderators are used to do complex term
23:         * transformation when applying a taclet. Often these transformation
24:         * caanot be described with the taclet scheme (or trying to do so would
25:         * result in a huge number of rules)
26:         */
27:        public class MetaAdd extends AbstractMetaOperator {
28:
29:            public MetaAdd() {
30:                super (new Name("#add"), 2);
31:            }
32:
33:            /**
34:             * checks whether the top level structure of the given @link Term
35:             * is syntactically valid, given the assumption that the top level
36:             * operator of the term is the same as this Operator. The
37:             * assumption that the top level operator and the term are equal
38:             * is NOT checked.  
39:             * @return true iff the top level structure of
40:             * the @link Term is valid.
41:             */
42:            public boolean validTopLevel(Term term) {
43:                // a meta operator accepts almost everything
44:                return term.op() instanceof  MetaAdd && term.arity() == arity();
45:            }
46:
47:            /** calculates the resulting term. */
48:            public Term calculate(Term term, SVInstantiations svInst,
49:                    Services services) {
50:                Term arg1 = term.sub(0);
51:                Term arg2 = term.sub(1);
52:                BigInteger bigIntArg1 = null;
53:                BigInteger bigIntArg2 = null;
54:
55:                bigIntArg1 = new BigInteger(convertToDecimalString(arg1,
56:                        services));
57:                bigIntArg2 = new BigInteger(convertToDecimalString(arg2,
58:                        services));
59:
60:                BigInteger bigIntResult = bigIntArg1.add(bigIntArg2);
61:
62:                IntLiteral lit = new IntLiteral(bigIntResult.toString());
63:                return services.getTypeConverter().convertToLogicElement(lit);
64:
65:            }
66:
67:        }
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