Examples of org.drools.compiler.Dialect

org.drools.compiler.Dialect
A Dialect implementation handles the building and execution of code expressions and blocks for a rule. This api is considered unstable, and subject to change. Those wishing to implement their own dialects should look ove the MVEL and Java dialect implementations.

    protected void createAndBuildPredicate( RuleBuildContext context,
                                          Pattern pattern,
                                          BaseDescr base,
                                          String expr,
                                          Map<String, OperatorDescr> aliases ) {
        Dialect dialect = context.getDialect();
        MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
        context.setDialect( mvelDialect );


        PredicateDescr pdescr = new PredicateDescr( context.getRuleDescr().getResource(), expr );
        pdescr.copyParameters( base );

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            if ( target != null ) {
                target.setReadAccessor( reader );
            }
        } else if ( fieldName.indexOf( '.' ) > -1 || fieldName.indexOf( '[' ) > -1 || fieldName.indexOf( '(' ) > -1 ) {
            // we need MVEL extractor for expressions
            Dialect dialect = context.getDialect();
            try {
                MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
                context.setDialect( mvelDialect );


                Map<String, Class< ? >> declarations = getDeclarationsMap( descr,

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    public EvaluatorWrapper wrapEvaluator( Evaluator evaluator, Declaration left, Declaration right ) {
        return new EvaluatorWrapper( evaluator, left, right );
    }


    public MVELCompilationUnit buildCompilationUnit(RuleBuildContext context, Pattern pattern, String expression, Map<String, OperatorDescr> aliases) {
        Dialect dialect = context.getDialect();
        context.setDialect( context.getDialect( "mvel" ) );


        PredicateDescr predicateDescr = new PredicateDescr( context.getRuleDescr().getResource(), expression );
        AnalysisResult analysis = buildAnalysis(context, pattern, predicateDescr, aliases);
        if ( analysis == null ) {

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    private void rewriteToEval(final RuleBuildContext context,
                               final Pattern pattern,
                               final FieldConstraintDescr fieldConstraintDescr,
                               final AbstractCompositeConstraint container) {
        // it is a complex expression, so we need to turn it into an MVEL predicate
        Dialect dialect = context.getDialect();
        // switch to MVEL dialect
        MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
        boolean strictMode = mvelDialect.isStrictMode();
        mvelDialect.setStrictMode( false );

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                restriction = new UnificationRestriction( (VariableRestriction) restriction );
            }
        }


        if ( restriction == null ) {
            Dialect dialect = context.getDialect();
            if ( !value2.startsWith( "(" ) ) {
                // it's not a traditional return value, so override the dialect
                MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
                context.setDialect( mvelDialect );
            }

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    private void createAndBuildPredicate( RuleBuildContext context,
                                          Pattern pattern,
                                          BaseDescr base,
                                          String expr,
                                          Map<String, OperatorDescr> aliases ) {
        Dialect dialect = context.getDialect();
        MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
        context.setDialect( mvelDialect );


        PredicateDescr pdescr = new PredicateDescr( context.getRuleDescr().getResource(), expr );
        pdescr.copyLocation( base );

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            if ( target != null ) {
                target.setReadAccessor( reader );
            }
        } else if ( fieldName.indexOf( '.' ) > -1 || fieldName.indexOf( '[' ) > -1 || fieldName.indexOf( '(' ) > -1 ) {
            // we need MVEL extractor for expressions
            Dialect dialect = context.getDialect();
            try {
                MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
                context.setDialect( mvelDialect );


                Map<String, Class< ? >> declarations = getDeclarationsMap( descr,

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    protected void createAndBuildPredicate( RuleBuildContext context,
                                          Pattern pattern,
                                          BaseDescr base,
                                          String expr,
                                          Map<String, OperatorDescr> aliases ) {
        Dialect dialect = context.getDialect();
        MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
        context.setDialect( mvelDialect );


        PredicateDescr pdescr = new PredicateDescr( context.getRuleDescr().getResource(), expr );
        pdescr.copyParameters( base );

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                target.setReadAccessor( reader );
            }
        } else if ( ! identifierRegexp.matcher( fieldName ).matches()
                    || ( fieldName.indexOf( '.' ) > -1 || fieldName.indexOf( '[' ) > -1 || fieldName.indexOf( '(' ) > -1 ) ) {
            // we need MVEL extractor for expressions
            Dialect dialect = context.getDialect();
            try {
                MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
                context.setDialect( mvelDialect );


                Map<String, Class< ? >> declarations = getDeclarationsMap( descr,

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            final RuleBuilder builder = new RuleBuilder();


            final PackageBuilder pkgBuilder = new PackageBuilder( pkg );
            final PackageBuilderConfiguration conf = pkgBuilder.getPackageBuilderConfiguration();
            DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectCompiletimeRegistry();
            Dialect dialect = dialectRegistry.getDialect( "mvel" );


            RuleBuildContext context = new RuleBuildContext( pkgBuilder,
                                                             ruleDescr,
                                                             dialectRegistry,
                                                             pkg,

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org.drools.rule.builder.ConstraintBuilder

org.drools.rule.builder.dialect.java.JavaAccumulateBuilderTest

org.drools.rule.builder.dialect.java.RuleBuilderTest

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