Package org.drools.rule

Examples of org.drools.rule.RuleConditionElement

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            final RuleConditionBuilder builder = (RuleConditionBuilder) context.getDialect().getBuilder( accumDescr.getInput().getClass() );

            Declaration[] previousDeclarations = (Declaration[]) context.getDeclarationResolver().getDeclarations( context.getRule() ).values().toArray( new Declaration[context.getDeclarationResolver().getDeclarations( context.getRule() ).size()] );

            // create source CE
            final RuleConditionElement source = builder.build( context,
                                                               accumDescr.getInput() );

            if ( source == null ) {
                return null;
            }

            MVELDialect dialect = (MVELDialect) context.getDialect();

            final Declaration[] sourceDeclArr = (Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] );

            Accumulator accumulator = null;
            Declaration[] declarations = null;

            if ( accumDescr.isExternalFunction() ) {
                // build an external function executor
                Map<String, Class< ? >> declarationsMap = context.getDeclarationResolver().getDeclarationClasses( context.getRule() );
                final Dialect.AnalysisResult analysis = dialect.analyzeExpression( context,
                                                                                   accumDescr,
                                                                                   accumDescr.getExpression(),
                                                                                   new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()} );

                MVELCompilationUnit unit = dialect.getMVELCompilationUnit( (String) accumDescr.getExpression(),
                                                                           analysis,
                                                                           previousDeclarations,
                                                                           (Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
                                                                           null,
                                                                           context );

                AccumulateFunction function = context.getConfiguration().getAccumulateFunction( accumDescr.getFunctionIdentifier() );

                accumulator = new MVELAccumulatorFunctionExecutor( unit,
                                                                   function );
            } else {
                // it is a custom accumulate
                Map<String, Class< ? >> declarationsMap = context.getDeclarationResolver().getDeclarationClasses( context.getRule() );
                final MVELAnalysisResult initCodeAnalysis = (MVELAnalysisResult) dialect.analyzeBlock( context,
                                                                                                       accumDescr,
                                                                                                       accumDescr.getInitCode(),
                                                                                                       new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()} );

                final MVELAnalysisResult actionCodeAnalysis = (MVELAnalysisResult) dialect.analyzeBlock( context,
                                                                                                         accumDescr,
                                                                                                         null,
                                                                                                         accumDescr.getActionCode(),
                                                                                                         new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()},
                                                                                                         initCodeAnalysis.getMvelVariables() );
                final MVELAnalysisResult resultCodeAnalysis = (MVELAnalysisResult) dialect.analyzeExpression( context,
                                                                                                              accumDescr,
                                                                                                              accumDescr.getResultCode(),
                                                                                                              new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()},
                                                                                                              initCodeAnalysis.getMvelVariables() );

                Dialect.AnalysisResult reverseCodeAnalysis = null;
                if ( accumDescr.getReverseCode() != null ) {
                    reverseCodeAnalysis = dialect.analyzeBlock( context,
                                                                accumDescr,
                                                                null,
                                                                accumDescr.getActionCode(),
                                                                new Map[]{declarationsMap, context.getPackageBuilder().getGlobals()},
                                                                initCodeAnalysis.getMvelVariables() );
                }

                MVELCompilationUnit initUnit = dialect.getMVELCompilationUnit( (String) accumDescr.getInitCode(),
                                                                               initCodeAnalysis,
                                                                               previousDeclarations,
                                                                               (Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
                                                                               null,
                                                                               context );

                MVELCompilationUnit actionUnit = dialect.getMVELCompilationUnit( (String) accumDescr.getActionCode(),
                                                                                 actionCodeAnalysis,
                                                                                 previousDeclarations,
                                                                                 (Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
                                                                                 initCodeAnalysis.getMvelVariables(),
                                                                                 context );

                MVELCompilationUnit reverseUnit = null;
                if ( accumDescr.getReverseCode() != null ) {
                    reverseUnit = dialect.getMVELCompilationUnit( (String) accumDescr.getReverseCode(),
                                                                  resultCodeAnalysis,
                                                                  previousDeclarations,
                                                                  (Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
                                                                  initCodeAnalysis.getMvelVariables(),
                                                                  context );
                }

                MVELCompilationUnit resultUnit = dialect.getMVELCompilationUnit( (String) accumDescr.getResultCode(),
                                                                                 resultCodeAnalysis,
                                                                                 previousDeclarations,
                                                                                 (Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[source.getOuterDeclarations().size()] ),
                                                                                 initCodeAnalysis.getMvelVariables(),
                                                                                 context );

                if ( reverseUnit != null ) {
                    Set<String> shadow = new HashSet<String>( source.getOuterDeclarations().keySet() );
                    shadow.retainAll( reverseCodeAnalysis.getNotBoundedIdentifiers() );
                    shadow.addAll( reverseCodeAnalysis.getBoundIdentifiers()[0] );

                    reverseUnit.setShadowIdentifiers( (String[]) shadow.toArray( new String[shadow.size()] ) );
                }
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            // gets corresponding builder
            final RuleConditionBuilder builder = (RuleConditionBuilder) context.getDialect().getBuilder( child.getClass() );

            if ( builder != null ) {
                final RuleConditionElement element = builder.build( context,
                                                                    child );
                // in case there is a problem with the building,
                // builder will return null. Ex: ClassNotFound for the pattern type
                if ( element != null ) {
                    ge.addChild( element );
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            return null;
        }

        final RuleConditionBuilder builder = (RuleConditionBuilder) context.getDialect().getBuilder( accumDescr.getInput().getClass() );

        final RuleConditionElement source = builder.build( context,
                                                           accumDescr.getInput() );

        if ( source == null ) {
            return null;
        }

        Accumulate accumulate = null;

        if ( accumDescr.isExternalFunction() ) {
            // if it is an external function, build a method for it

            final JavaAnalysisResult analysis = (JavaAnalysisResult) context.getDialect().analyzeBlock( context,
                                                                                                        accumDescr,
                                                                                                        accumDescr.getExpression(),
                                                                                                        new Map[]{context.getDeclarationResolver().getDeclarationClasses(context.getRule()), context.getPackageBuilder().getGlobals()} );

            final List[] usedIdentifiers = analysis.getBoundIdentifiers();

            final List<Declaration> tupleDeclarations = new ArrayList<Declaration>();
            for ( int i = 0, size = usedIdentifiers[0].size(); i < size; i++ ) {
                tupleDeclarations.add( context.getDeclarationResolver().getDeclaration(context.getRule(), (String) usedIdentifiers[0].get( i ) ) );
            }

            final Declaration[] previousDeclarations = tupleDeclarations.toArray( new Declaration[tupleDeclarations.size()] );
            final String[] requiredGlobals = (String[]) usedIdentifiers[1].toArray( new String[usedIdentifiers[1].size()] );
            final Declaration[] sourceDeclArr = (Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[0] );

            final String className = "accumulateExpression" + context.getNextId();

            final Map<String, Object> map = createVariableContext( className,
                                                   (String) accumDescr.getExpression(),
                                                   context,
                                                   previousDeclarations,
                                                   sourceDeclArr,
                                                   requiredGlobals );
            map.put( "readLocalsFromTuple", accumDescr.isMultiPattern() ? Boolean.TRUE : Boolean.FALSE );

            AccumulateFunction function = context.getConfiguration().getAccumulateFunction( accumDescr.getFunctionIdentifier() );

            JavaAccumulatorFunctionExecutor accumulator = new JavaAccumulatorFunctionExecutor( function );

            accumulate = new Accumulate( source,
                                         previousDeclarations,
                                         sourceDeclArr,
                                         accumulator );

            generatTemplates( "returnValueMethod",
                              "returnValueInvoker",
                              context,
                              className,
                              map,
                              accumulator,
                              accumDescr );
        } else {
            // ELSE, if it is not an external function, build it using the regular java builder
            final String className = "Accumulate" + context.getNextId();
            accumDescr.setClassName( className );

            Map<String,Class<?>>[] available = new Map[]{context.getDeclarationResolver().getDeclarationClasses(context.getRule()), context.getPackageBuilder().getGlobals()};
            final JavaAnalysisResult initCodeAnalysis = (JavaAnalysisResult) context.getDialect().analyzeBlock( context,
                                                                                                                accumDescr,
                                                                                                                accumDescr.getInitCode(),
                                                                                                                available );
            final Dialect.AnalysisResult actionCodeAnalysis = context.getDialect().analyzeBlock( context,
                                                                                                 accumDescr,
                                                                                                 accumDescr.getActionCode(),
                                                                                                 available );
            final Dialect.AnalysisResult resultCodeAnalysis = context.getDialect().analyzeExpression( context,
                                                                                                      accumDescr,
                                                                                                      accumDescr.getResultCode(),
                                                                                                      available );

            final Set<String> requiredDeclarations = new HashSet<String>( initCodeAnalysis.getBoundIdentifiers()[0] );
            requiredDeclarations.addAll( actionCodeAnalysis.getBoundIdentifiers()[0] );
            requiredDeclarations.addAll( resultCodeAnalysis.getBoundIdentifiers()[0] );

            final Set<String> requiredGlobals = new HashSet<String>( initCodeAnalysis.getBoundIdentifiers()[1] );
            requiredGlobals.addAll( actionCodeAnalysis.getBoundIdentifiers()[1] );
            requiredGlobals.addAll( resultCodeAnalysis.getBoundIdentifiers()[1] );

            if ( accumDescr.getReverseCode() != null ) {
                final Dialect.AnalysisResult reverseCodeAnalysis = context.getDialect().analyzeBlock( context,
                                                                                                      accumDescr,
                                                                                                      accumDescr.getActionCode(),
                                                                                                      available );
                requiredDeclarations.addAll( reverseCodeAnalysis.getBoundIdentifiers()[0] );
                requiredGlobals.addAll( reverseCodeAnalysis.getBoundIdentifiers()[1] );
            }

            final Declaration[] declarations = new Declaration[requiredDeclarations.size()];
            int i = 0;
            for( Iterator<String> it = requiredDeclarations.iterator(); it.hasNext(); i++ ) {
                declarations[i] = context.getDeclarationResolver().getDeclaration(context.getRule(), it.next() );
            }
            final Declaration[] sourceDeclArr = (Declaration[]) source.getOuterDeclarations().values().toArray( new Declaration[0] );

            final String[] globals = requiredGlobals.toArray( new String[requiredGlobals.size()] );

            final Map<String, Object> map = createVariableContext( className,
                                                   null,
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        final List resultBetaConstraints = context.getBetaconstraints();
        final List resultAlphaConstraints = context.getAlphaConstraints();
        final List resultBehaviors = context.getBehaviors();

        final RuleConditionElement source = accumulate.getSource();

        // get builder for the pattern
        final ReteooComponentBuilder builder = utils.getBuilderFor( source );

        // save tuple source and current pattern offset for later if needed
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            final GroupElement ge = (GroupElement) rce;

            // iterate over each child and build it
            for ( final Iterator it = ge.getChildren().iterator(); it.hasNext(); ) {

                final RuleConditionElement child = (RuleConditionElement) it.next();

                final ReteooComponentBuilder builder = utils.getBuilderFor( child );

                builder.build( context,
                               utils,
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            // will have no child
            if ( and.getChildren().isEmpty() ) {
                return true;
            }

            final RuleConditionElement child = (RuleConditionElement) and.getChildren().get( 0 );
            final ReteooComponentBuilder builder = utils.getBuilderFor( child );

            return builder.requiresLeftActivation( utils,
                                                   child );
        }
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            // NOT must save some context info to restore it later
            final int currentPatternIndex = context.getCurrentPatternOffset();
            final LeftTupleSource tupleSource = context.getTupleSource();

            // get child
            final RuleConditionElement child = (RuleConditionElement) not.getChildren().get( 0 );

            // get builder for child
            final ReteooComponentBuilder builder = utils.getBuilderFor( child );

            // builds the child
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            // EXISTS must save some context info to restore it later
            final int currentPatternIndex = context.getCurrentPatternOffset();
            final LeftTupleSource tupleSource = context.getTupleSource();

            // get child
            final RuleConditionElement child = (RuleConditionElement) exists.getChildren().get( 0 );

            // get builder for child
            final ReteooComponentBuilder builder = utils.getBuilderFor( child );

            // builds the child
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        }
    }

    private boolean isNegative(final BuildContext context) {
        for ( ListIterator<RuleConditionElement> it = context.stackIterator(); it.hasPrevious(); ) {
            RuleConditionElement rce = it.previous();
            if ( rce instanceof GroupElement && ((GroupElement) rce).isNot() ) {
                return true;
            }
        }
        return false;
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        }
    }

    private boolean isNegative(final BuildContext context) {
        for ( ListIterator<RuleConditionElement> it = context.stackIterator(); it.hasPrevious(); ) {
            RuleConditionElement rce = it.previous();
            if ( rce instanceof GroupElement && ((GroupElement) rce).isNot() ) {
                return true;
            }
        }
        return false;
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Related Classes of org.drools.rule.RuleConditionElement

  • org.drools.eclipse.DRLInfo$RuleInfo
  • org.drools.lang.api.DescrBuilderTest
  • org.drools.reteoo.builder.AccumulateBuilder
  • org.drools.reteoo.builder.BuildUtils
  • org.drools.reteoo.builder.GroupElementBuilder$AndBuilder
  • org.drools.reteoo.builder.GroupElementBuilder$ExistsBuilder
  • org.drools.reteoo.builder.GroupElementBuilder$NotBuilder
  • org.drools.reteoo.builder.PatternBuilder
  • org.drools.rule.builder.ConditionalBranchBuilder
  • org.drools.rule.builder.dialect.java.JavaAccumulateBuilder
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