Package org.drools.rule

Examples of org.drools.rule.Pattern.addConstraint()

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        // Path( id == seatingPid, pathGuestName:guestName, pathSeat:seat )
        // -----------
        final Pattern pathPattern = new Pattern( 2,
                                                 this.pathType );

        pathPattern.addConstraint( getBoundVariableConstraint( pathPattern,
                                                               "id",
                                                               seatingPidDeclaration,
                                                               this.integerEqualEvaluator ) );

        setFieldDeclaration( pathPattern,
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        // (not Path( id == seatingId, guestName == pathGuestName )
        // -------------
        final Pattern notPathPattern = new Pattern( 3,
                                                    this.pathType );

        notPathPattern.addConstraint( getBoundVariableConstraint( notPathPattern,
                                                                  "id",
                                                                  seatingIdDeclaration,
                                                                  this.integerEqualEvaluator ) );
        notPathPattern.addConstraint( getBoundVariableConstraint( notPathPattern,
                                                                  "guestName",
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        notPathPattern.addConstraint( getBoundVariableConstraint( notPathPattern,
                                                                  "id",
                                                                  seatingIdDeclaration,
                                                                  this.integerEqualEvaluator ) );
        notPathPattern.addConstraint( getBoundVariableConstraint( notPathPattern,
                                                                  "guestName",
                                                                  pathGuestNameDeclaration,
                                                                  this.objectEqualEvaluator ) );

        final GroupElement not = GroupElementFactory.newNotInstance();
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        // -----------
        final Pattern contextPattern = new Pattern( 0,
                                                    this.contextType,
                                                    "context" );

        contextPattern.addConstraint( getLiteralConstraint( contextPattern,
                                                            "state",
                                                            Context.MAKE_PATH,
                                                            this.integerEqualEvaluator ) );

        rule.addPattern( contextPattern );
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        // ---------------
        final Pattern seatingPattern = new Pattern( 1,
                                                    this.seatingType,
                                                    "seating" );

        seatingPattern.addConstraint( getLiteralConstraint( seatingPattern,
                                                            "pathDone",
                                                            false,
                                                            this.booleanEqualEvaluator ) );

        rule.addPattern( seatingPattern );
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        // -----------
        final Pattern contextPattern = new Pattern( 0,
                                                    this.contextType,
                                                    "context" );

        contextPattern.addConstraint( getLiteralConstraint( contextPattern,
                                                            "state",
                                                            Context.CHECK_DONE,
                                                            this.integerEqualEvaluator ) );

        rule.addPattern( contextPattern );
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        // -------------
        final Pattern seatingPattern = new Pattern( 2,
                                                    this.seatingType,
                                                    null );

        seatingPattern.addConstraint( getBoundVariableConstraint( seatingPattern,
                                                                  "rightSeat",
                                                                  lastSeatDeclaration,
                                                                  this.integerEqualEvaluator ) );

        rule.addPattern( seatingPattern );
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        // -----------
        final Pattern contextPattern = new Pattern( 0,
                                                    this.contextType,
                                                    "context" );

        contextPattern.addConstraint( getLiteralConstraint( contextPattern,
                                                            "state",
                                                            Context.CHECK_DONE,
                                                            this.integerEqualEvaluator ) );

        rule.addPattern( contextPattern );
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        // context : Context( state == Context.PRINT_RESULTS )
        // -----------
        final Pattern contextPattern = new Pattern( 0,
                                                    this.contextType );

        contextPattern.addConstraint( getLiteralConstraint( contextPattern,
                                                            "state",
                                                            Context.PRINT_RESULTS,
                                                            this.integerEqualEvaluator ) );

        rule.addPattern( contextPattern );
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                                                           null );

        final LiteralConstraint constraint = new LiteralConstraint( extractor,
                                                                    evaluator,
                                                                    field );
        pattern.addConstraint( constraint );
        rule.addPattern( pattern );

        rule.setConsequence( new Consequence() {
            public void evaluate(final KnowledgeHelper knowledgeHelper,
                                 final org.drools.WorkingMemory workingMemory) throws Exception {
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