Source Code Cross Referenced for BuiltInRuleAppContainer.java in  » Testing » KeY » de » uka » ilkd » key » strategy » 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.strategy 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // This file is part of KeY - Integrated Deductive Software Design
002:        // Copyright (C) 2001-2007 Universitaet Karlsruhe, Germany
003:        //                         Universitaet Koblenz-Landau, Germany
004:        //                         Chalmers University of Technology, Sweden
005:        //
006:        // The KeY system is protected by the GNU General Public License. 
007:        // See LICENSE.TXT for details.
008:        //
009:        //
010:
011:        package de.uka.ilkd.key.strategy;
012:
013:        import de.uka.ilkd.key.logic.*;
014:        import de.uka.ilkd.key.proof.Goal;
015:        import de.uka.ilkd.key.rule.BuiltInRule;
016:        import de.uka.ilkd.key.rule.BuiltInRuleApp;
017:        import de.uka.ilkd.key.rule.RuleApp;
018:
019:        /**
020:         * Instances of this class are immutable
021:         */
022:        public class BuiltInRuleAppContainer extends RuleAppContainer {
023:
024:            BuiltInRuleAppContainer(RuleApp p_app, RuleAppCost p_cost) {
025:                super (p_app, p_cost);
026:            }
027:
028:            /**
029:             * Create a list of new RuleAppContainers that are to be 
030:             * considered for application.
031:             */
032:            public ListOfRuleAppContainer createFurtherApps(Goal p_goal,
033:                    Strategy p_strategy) {
034:                if (isStillApplicable(p_goal))
035:                    return createAppContainers((BuiltInRuleApp) getRuleApp(),
036:                            null, p_goal, p_strategy);
037:                return SLListOfRuleAppContainer.EMPTY_LIST;
038:            }
039:
040:            /**
041:             * Create a <code>RuleApp</code> that is suitable to be applied 
042:             * or <code>null</code>.
043:             */
044:            public RuleApp completeRuleApp(Goal p_goal, Strategy p_strategy) {
045:                if (!isStillApplicable(p_goal))
046:                    return null;
047:
048:                final BuiltInRuleApp app = getBuiltInRuleApp();
049:                final BuiltInRule rule = (BuiltInRule) app.rule();
050:                final Constraint userConstraint = app.userConstraint();
051:                final PosInOccurrence pio = getBuiltInRuleApp()
052:                        .posInOccurrence();
053:
054:                return new BuiltInRuleApp(rule, pio, userConstraint);
055:            }
056:
057:            /**
058:             * @return the BuiltInRuleApp belonging to this container
059:             */
060:            protected BuiltInRuleApp getBuiltInRuleApp() {
061:                return (BuiltInRuleApp) getRuleApp();
062:            }
063:
064:            /**
065:             * @return true iff the stored rule app is applicable for the given sequent,
066:             * i.e. if the bound position does still exist (if-formulas are not
067:             * considered)
068:             */
069:            protected boolean isStillApplicable(Goal p_goal) {
070:                final BuiltInRuleApp app = getBuiltInRuleApp();
071:                final PosInOccurrence pio = app.posInOccurrence();
072:                if (pio == null) {
073:                    return true;
074:                }
075:                final ConstrainedFormula cfma = pio.constrainedFormula();
076:                final boolean antec = pio.isInAntec();
077:                final Sequent seq = p_goal.sequent();
078:                final Semisequent semiseq = antec ? seq.antecedent() : seq
079:                        .succedent();
080:
081:                if (!semiseq.contains(cfma))
082:                    return false;
083:
084:                return true;
085:            }
086:
087:            /**
088:             * Create containers for RuleApps.
089:             * @return list of containers for currently applicable BuiltInRuleApps,
090:             * the cost may be an instance of <code>TopRuleAppCost</code>.
091:             */
092:            static ListOfRuleAppContainer createAppContainers(
093:                    BuiltInRuleApp p_app, PosInOccurrence p_pio, Goal p_goal,
094:                    Strategy p_strategy) {
095:                ListOfRuleAppContainer result = SLListOfRuleAppContainer.EMPTY_LIST;
096:
097:                final RuleAppCost cost = p_strategy.computeCost(p_app, p_pio,
098:                        p_goal);
099:
100:                BuiltInRuleAppContainer container = new BuiltInRuleAppContainer(
101:                        p_app, cost);
102:
103:                result = result.prepend(container);
104:
105:                return result;
106:            }
107:
108:        }
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