Examples of org.drools.compiler.compiler.Dialect

org.drools.compiler.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.

            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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    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();
            Map<String, Class< ? >> globals = context.getKnowledgeBuilder().getGlobals();


            try {
                MVELDialect mvelDialect = (MVELDialect) context.getDialect( "mvel" );
                context.setDialect( mvelDialect );

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    }


    private void addFunction(final FunctionDescr functionDescr) {
        functionDescr.setResource(this.resource);
        PackageRegistry pkgRegistry = this.pkgRegistryMap.get(functionDescr.getNamespace());
        Dialect dialect = pkgRegistry.getDialectCompiletimeRegistry().getDialect(functionDescr.getDialect());
        dialect.addFunction(functionDescr,
                            pkgRegistry.getTypeResolver(),
                            this.resource);
    }

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                            this.resource);
    }


    private void preCompileAddFunction(final FunctionDescr functionDescr) {
        PackageRegistry pkgRegistry = this.pkgRegistryMap.get(functionDescr.getNamespace());
        Dialect dialect = pkgRegistry.getDialectCompiletimeRegistry().getDialect(functionDescr.getDialect());
        dialect.preCompileAddFunction(functionDescr,
                                      pkgRegistry.getTypeResolver());
    }

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                                      pkgRegistry.getTypeResolver());
    }


    private void postCompileAddFunction(final FunctionDescr functionDescr) {
        PackageRegistry pkgRegistry = this.pkgRegistryMap.get(functionDescr.getNamespace());
        Dialect dialect = pkgRegistry.getDialectCompiletimeRegistry().getDialect(functionDescr.getDialect());
        dialect.postCompileAddFunction(functionDescr, pkgRegistry.getTypeResolver());


        if (rootClassLoader instanceof ProjectClassLoader) {
            String functionClassName = functionDescr.getClassName();
            JavaDialectRuntimeData runtime = ((JavaDialectRuntimeData) pkgRegistry.getDialectRuntimeRegistry().getDialectData( "java" ));
            byte [] def = runtime.getStore().get(convertClassToResourcePath(functionClassName));

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            final RuleBuilder builder = new RuleBuilder();


            final KnowledgeBuilderImpl pkgBuilder = new KnowledgeBuilderImpl( pkg );
            final KnowledgeBuilderConfigurationImpl conf = pkgBuilder.getBuilderConfiguration();
            DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectCompiletimeRegistry();
            Dialect dialect = dialectRegistry.getDialect( "mvel" );


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

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        pkgBuilder.addPackage( new PackageDescr( "org.drools" ) );
        final KnowledgeBuilderConfigurationImpl conf = pkgBuilder.getBuilderConfiguration();
        PackageRegistry pkgReg = pkgBuilder.getPackageRegistry( "org.drools" );
        InternalKnowledgePackage pkg = pkgReg.getPackage();
        DialectCompiletimeRegistry dialectRegistry = pkgReg.getDialectCompiletimeRegistry();
        Dialect dialect = dialectRegistry.getDialect( "java" );
                
        RuleDescr ruleDescr = new RuleDescr("test rule");
        RuleBuildContext context = new RuleBuildContext( pkgBuilder, ruleDescr, dialectRegistry, pkg, dialect);
        
        Accumulate accumulate = (Accumulate) builder.build( context, accumDescr );

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        final Field dialectField = builder.getClass().getDeclaredField( "defaultDialect" );
        dialectField.setAccessible( true );
        String dialectName = (String) dialectField.get( builder );


        reg = builder.getPackageRegistry( pkgDescr.getName() ).getDialectCompiletimeRegistry();
        Dialect dialect = reg.getDialect( dialectName );


        final Field compilerField = dialect.getClass().getDeclaredField( "compiler" );
        compilerField.setAccessible( true );
        JavaCompiler compiler = (JavaCompiler) compilerField.get( dialect );


        KnowledgeBuilderConfigurationImpl conf = new KnowledgeBuilderConfigurationImpl();
        JavaDialectConfiguration javaConf = (JavaDialectConfiguration) conf.getDialectConfiguration( "java" );

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        pkgBuilder.addPackage( new PackageDescr( "org.drools" ) );
        final PackageBuilderConfiguration conf = pkgBuilder.getPackageBuilderConfiguration();
        PackageRegistry pkgReg = pkgBuilder.getPackageRegistry( "org.drools" );
        Package pkg = pkgReg.getPackage();
        DialectCompiletimeRegistry dialectRegistry = pkgReg.getDialectCompiletimeRegistry();
        Dialect dialect = dialectRegistry.getDialect( "java" );
                
        RuleDescr ruleDescr = new RuleDescr("test rule");
        RuleBuildContext context = new RuleBuildContext( pkgBuilder, ruleDescr, dialectRegistry, pkg, dialect);
        
        Accumulate accumulate = (Accumulate) builder.build( context, accumDescr );

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Related Classes of org.drools.compiler.compiler.Dialect

org.drools.compiler.builder.impl.KnowledgeBuilderConfigurationImpl

org.drools.compiler.builder.impl.KnowledgeBuilderImpl

org.drools.compiler.builder.impl.KnowledgeBuilderTest

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

org.drools.compiler.rule.builder.dialect.mvel.MVELConsequenceBuilderTest

org.drools.compiler.rule.builder.MVELConstraintBuilder

org.drools.compiler.rule.builder.PatternBuilder

org.drools.compiler.rule.builder.RuleBuildContext

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