Source Code Cross Referenced for ApplyOnUpdate.java in  » Testing » KeY » de » uka » ilkd » key » rule » updatesimplifier » 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.updatesimplifier 
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:        package de.uka.ilkd.key.rule.updatesimplifier;
10:
11:        import de.uka.ilkd.key.java.Services;
12:        import de.uka.ilkd.key.logic.Term;
13:        import de.uka.ilkd.key.logic.UpdateFactory;
14:        import de.uka.ilkd.key.logic.op.*;
15:        import de.uka.ilkd.key.rule.AbstractUpdateRule;
16:        import de.uka.ilkd.key.rule.UpdateSimplifier;
17:        import de.uka.ilkd.key.util.Debug;
18:
19:        /**
20:         * Applies an update on an array using rule ...
21:         */
22:        public class ApplyOnUpdate extends AbstractUpdateRule {
23:
24:            private final UpdateFactory ufac;
25:
26:            /**
27:             * creates an instance of this rule used by the given update
28:             * simplifier
29:             */
30:            public ApplyOnUpdate(UpdateSimplifier us) {
31:                super (us);
32:                // The update factory does not need <code>Services</code> for what we
33:                // are doing with it
34:                ufac = new UpdateFactory(null, us);
35:            }
36:
37:            /**
38:             * determines whether this rule is applicable for the 
39:             * update x target (the term on which the update will be
40:             * applied) pair 
41:             * @param update the Update to be applied on target
42:             * @param target the Term on which the update is applied
43:             * @return true if the top level operator of target is an
44:             * attribute operator
45:             */
46:            public boolean isApplicable(Update update, Term target) {
47:                return target.op() instanceof  IUpdateOperator;
48:            }
49:
50:            /**
51:             * determines whether this rule is applicable for the pair of update and
52:             * target (the term on which the update will be applied) term
53:             * 
54:             * @param update
55:             *            the Update to be applied on the given term
56:             * @param target
57:             *            the Term on which the update is applied
58:             * @param services
59:             *            the Services object
60:             * @return true if the rule can be applied on the update, target pair
61:             */
62:            public Term apply(Update update, Term target, Services services) {
63:                final Update targetUpdate = Update.createUpdate(target);
64:                final Update composedUpdate = ufac.sequential(update,
65:                        targetUpdate);
66:                final IUpdateOperator updateOp = (IUpdateOperator) target.op();
67:                final Term subTarget = updateOp.target(target);
68:                return ufac.apply(composedUpdate, subTarget);
69:            }
70:
71:            public Term matchingCondition(Update update, Term target,
72:                    Services services) {
73:                // an update is not a location
74:                Debug
75:                        .fail("matchingCondition(...) must not be called for target "
76:                                + target);
77:                return null; // unreachable
78:            }
79:        }
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