Source Code Cross Referenced for DepthTermOrdering.java in  » Testing » KeY » de » uka » ilkd » key » logic » 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.logic 
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:
11:        package de.uka.ilkd.key.logic;
12:
13:        import de.uka.ilkd.key.logic.op.IteratorOfOperator;
14:        import de.uka.ilkd.key.logic.op.Operator;
15:
16:        /**
17:         * Term ordering, comparing the maximum depths of terms and contained
18:         * variables; following definition 5.14 in the script "Automatisches
19:         * Beweisen", Bernhard Beckert, Reiner Haehnle
20:         */
21:        public class DepthTermOrdering implements  TermOrdering {
22:
23:            /**
24:             * Compare the two given terms
25:             * @return a number negative, zero or a number positive if
26:             * <code>p_a</code> is less than, equal, or greater than
27:             * <code>p_b</code> regarding the ordering given by the
28:             * implementing class
29:             */
30:            public int compare(Term p_a, Term p_b) {
31:                DepthCollector depthsA = new DepthCollector();
32:                DepthCollector depthsB = new DepthCollector();
33:
34:                p_a.execPostOrder(depthsA);
35:                p_b.execPostOrder(depthsB);
36:
37:                if (depthsA.getMaxDepth() < depthsB.getMaxDepth())
38:                    return compareVars(depthsA, depthsB);
39:                else if (depthsB.getMaxDepth() < depthsA.getMaxDepth())
40:                    return -compareVars(depthsB, depthsA);
41:                else
42:                    return 0;
43:            }
44:
45:            /**
46:             * @return a negative number, if each variable collected by
47:             * <code>p_depthsA</code> has also been collected by
48:             * <code>p_depthsB</code>, and <code>p_depthsB</code> has also
49:             * found a greater maximum depth for that variable; zero otherwise
50:             */
51:            protected int compareVars(DepthCollector p_depthsA,
52:                    DepthCollector p_depthsB) {
53:                IteratorOfOperator it = p_depthsA.getVariables();
54:                Operator var;
55:                int depthB;
56:
57:                while (it.hasNext()) {
58:                    var = it.next();
59:                    depthB = p_depthsB.getMaxDepth(var);
60:
61:                    if (depthB == -1 || depthB <= p_depthsA.getMaxDepth(var))
62:                        return 0;
63:                }
64:
65:                return -1;
66:            }
67:
68:        }
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