Package org.drools.lang.descr

Examples of org.drools.lang.descr.RuleDescr

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     * Build the give rule into the
     * @param context
     * @return
     */
    public void build(final RuleBuildContext context) {
        RuleDescr ruleDescr = context.getRuleDescr();

        //Query and get object instead of using String
        if ( null != ruleDescr.getParentName() && null != context.getPkg().getRule( ruleDescr.getParentName() ) ) {
            context.getRule().setParent( context.getPkg().getRule( ruleDescr.getParentName() ) );
        }
        // add all the rule's meta attributes
        buildMetaAttributes( context );

        final RuleConditionBuilder builder = (RuleConditionBuilder) context.getDialect().getBuilder( ruleDescr.getLhs().getClass() );
        if ( builder != null ) {
            Pattern prefixPattern = null;
            if ( context.getRuleDescr() instanceof QueryDescr ) {
                prefixPattern = context.getDialect().getQueryBuilder().build( context,
                                                                              (QueryDescr) context.getRuleDescr() );
            }
            final GroupElement ce = (GroupElement) builder.build( context,
                                                                  ruleDescr.getLhs(),
                                                                  prefixPattern );

            context.getRule().setLhs( ce );
        } else {
            throw new RuntimeDroolsException( "BUG: builder not found for descriptor class " + ruleDescr.getLhs().getClass() );
        }

        // build all the rule's attributes
        // must be after building LHS because some attributes require bindings from the LHS
        buildAttributes( context );

        // Build the consequence and generate it's invoker/s
        // generate the main rule from the previously generated s.
        if ( !(ruleDescr instanceof QueryDescr) ) {
            // do not build the consequence if we have a query

            ConsequenceBuilder consequenceBuilder = context.getDialect().getConsequenceBuilder();
            consequenceBuilder.build( context, Rule.DEFAULT_CONSEQUENCE_NAME );
           
            for ( String name : ruleDescr.getNamedConsequences().keySet() ) {
                consequenceBuilder.build( context, name );
            }
        }
    }
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        return result;
    }

    public void buildAttributes(final RuleBuildContext context) {
        final Rule rule = context.getRule();
        final RuleDescr ruleDescr = context.getRuleDescr();

        for ( final AttributeDescr attributeDescr : ruleDescr.getAttributes().values() ) {
            final String name = attributeDescr.getName();
            if ( name.equals( "no-loop" ) ) {
                rule.setNoLoop( getBooleanValue( attributeDescr,
                                                 true ) );
            } else if ( name.equals( "auto-focus" ) ) {
                rule.setAutoFocus( getBooleanValue( attributeDescr,
                                                    true ) );
            } else if ( name.equals( "agenda-group" ) ) {
                rule.setAgendaGroup( attributeDescr.getValue() );
            } else if ( name.equals( "activation-group" ) ) {
                rule.setActivationGroup( attributeDescr.getValue() );
            } else if ( name.equals( "ruleflow-group" ) ) {
                rule.setRuleFlowGroup( attributeDescr.getValue() );
            } else if ( name.equals( "lock-on-active" ) ) {
                rule.setLockOnActive( getBooleanValue( attributeDescr,
                                                       true ) );
            } else if ( name.equals( DroolsSoftKeywords.DURATION ) || name.equals( DroolsSoftKeywords.TIMER ) ) {
                String duration = attributeDescr.getValue();
                buildTimer( rule, duration, context);
            }  else if ( name.equals( "calendars" ) ) {
                buildCalendars( rule, attributeDescr.getValue(), context );
            } else if ( name.equals( "date-effective" ) ) {
                final Calendar cal = Calendar.getInstance();
                cal.setTime( DateUtils.parseDate( attributeDescr.getValue(),
                                                  context.getPackageBuilder().getDateFormats()  ) );
                rule.setDateEffective( cal );
            } else if ( name.equals( "date-expires" ) ) {
                final Calendar cal = Calendar.getInstance();
                cal.setTime( DateUtils.parseDate( attributeDescr.getValue(),
                                                  context.getPackageBuilder().getDateFormats()  ) );
                rule.setDateExpires( cal );
            }
        }

        buildSalience( context );

        buildEnabled( context );
       
        AnnotationDescr ann = ruleDescr.getAnnotation( "activationListener" );
        if ( ann != null && !StringUtils.isEmpty( (String) ann.getValue() ) ) {
            rule.setActivationListener( MVEL.evalToString( (String) ann.getValue() ) );
        }

        //        buildDuration( context );
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        return EXPRESSION_DIALECT_NAME;
    }

    public void addRule(RuleBuildContext context) {
        // MVEL: Compiler change
        final RuleDescr ruleDescr = context.getRuleDescr();

        // setup the line mappins for this rule
        final String name = this.pkg.getName() + "." + StringUtils.ucFirst( ruleDescr.getClassName() );
        final LineMappings mapping = new LineMappings( name );
        mapping.setStartLine( ruleDescr.getConsequenceLine() );
        mapping.setOffset( ruleDescr.getConsequenceOffset() );

        context.getPkg().getDialectRuntimeRegistry().getLineMappings().put( name,
                                                                            mapping );

    }
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        context.getBuildStack().push( context.getRule().getLhs() );

        try {
            MVELDialect dialect = (MVELDialect) context.getDialect( context.getDialect().getId() );
           
            final RuleDescr ruleDescr = context.getRuleDescr();
           
            String text = ( Rule.DEFAULT_CONSEQUENCE_NAME.equals(consequenceName) ) ?
                    (String) ruleDescr.getConsequence() :
                    (String) ruleDescr.getNamedConsequences().get( consequenceName );

            text = processMacros( text );
           
            Map<String, Declaration> decls = context.getDeclarationResolver().getDeclarations(context.getRule());
           
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     * This will add the rule for compiling later on.
     * It will not actually call the compiler
     */
    public void addRule(final RuleBuildContext context) {
        final Rule rule = context.getRule();
        final RuleDescr ruleDescr = context.getRuleDescr();

        RuleClassBuilder classBuilder = context.getDialect().getRuleClassBuilder();

        String ruleClass = classBuilder.buildRule( context );
        // return if there is no ruleclass name;
        if ( ruleClass == null ) {
            return;
        }

        // The compilation result is for the entire rule, so difficult to associate with any descr
        addClassCompileTask( this.pkg.getName() + "." + ruleDescr.getClassName(),
                             ruleDescr,
                             ruleClass,
                             this.src,
                             new RuleErrorHandler( ruleDescr,
                                                   rule,
                                                   "Rule Compilation error" ) );

        JavaDialectRuntimeData data = (JavaDialectRuntimeData) this.pkg.getDialectRuntimeRegistry().getDialectData( ID );

        for ( Map.Entry<String, String> invokers : context.getInvokers().entrySet() ) {
            final String className = invokers.getKey();

            // Check if an invoker - returnvalue, predicate, eval or consequence has been associated
            // If so we add it to the PackageCompilationData as it will get wired up on compilation
            final Object invoker = context.getInvokerLookups().get( className );
            if ( invoker != null ) {
                data.putInvoker( className,
                                 invoker );
            }
            final String text = invokers.getValue();

            final BaseDescr descr = (BaseDescr) context.getDescrLookups().get( className );
            addClassCompileTask( className,
                                 descr,
                                 text,
                                 this.src,
                                 new RuleInvokerErrorHandler( descr,
                                                              rule,
                                                              "Unable to generate rule invoker." ) );

        }

        // setup the line mappins for this rule
        final String name = this.pkg.getName() + "." + StringUtils.ucFirst( ruleDescr.getClassName() );
        final LineMappings mapping = new LineMappings( name );
        mapping.setStartLine( ruleDescr.getConsequenceLine() );
        mapping.setOffset( ruleDescr.getConsequenceOffset() );

        this.pkg.getDialectRuntimeRegistry().getLineMappings().put( name,
                                                                    mapping );

    }
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            buffer.append("import static ").append(s).append(";");
        }
       
        buffer.append( lineSeparator );

        final RuleDescr ruleDescr = context.getRuleDescr();
       
        buffer.append("public class ").append(StringUtils.ucFirst(ruleDescr.getClassName())).append(" {").append(lineSeparator);
        buffer.append("    private static final long serialVersionUID = 510l;").append(lineSeparator);

        for ( int i = 0, size = context.getMethods().size() - 1; i < size; i++ ) {
            buffer.append(context.getMethods().get(i)).append(lineSeparator);
        }

        final String[] lines = buffer.toString().split( lineSeparator, -1 );

        ruleDescr.setConsequenceOffset( lines.length );

        buffer.append(context.getMethods().get(context.getMethods().size() - 1)).append(lineSeparator);
        buffer.append( "}" );

        return buffer.toString();
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    public void testDebug() throws Exception {
        String rule = "package com.sample; dialect \"mvel\" rule myRule when then\n System.out.println( \"test\" ); end";
        PackageBuilder builder = new PackageBuilder();
        DrlParser parser = new DrlParser();
        PackageDescr packageDescr = parser.parse(rule);
        RuleDescr ruleDescr = packageDescr.getRules().get(0);
        builder = new PackageBuilder( );
        builder.addPackage(packageDescr);
        Package pkg = builder.getPackage();
        MVELConsequence consequence = (MVELConsequence) pkg.getRule("myRule").getConsequence();
        String sourceName = ((CompiledExpression) consequence.getCompExpr()).getSourceName();
        System.out.println(sourceName);
        String ruleName = ruleDescr.getNamespace() + "." + ruleDescr.getClassName();
        System.out.println(ruleName);
        assertEquals(sourceName, ruleName);
    }
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    }

    @Test
    public void testSimpleExpression() {
        final Package pkg = new Package( "pkg1" );
        final RuleDescr ruleDescr = new RuleDescr( "rule 1" );

        PackageBuilder pkgBuilder = new PackageBuilder( pkg );
        final PackageBuilderConfiguration conf = pkgBuilder.getPackageBuilderConfiguration();
        DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectCompiletimeRegistry();
        MVELDialect mvelDialect = (MVELDialect) dialectRegistry.getDialect( "mvel" );
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        PackageDescr pkgDescr = new PackageDescr( "pkg1" );
        PackageBuilder pkgBuilder = new PackageBuilder();
        pkgBuilder.addPackage( pkgDescr );

        final Package pkg = pkgBuilder.getPackageRegistry( "pkg1" ).getPackage();
        final RuleDescr ruleDescr = new RuleDescr( "rule 1" );
        ruleDescr.setNamespace( "pkg1" );
        ruleDescr.setConsequence( "modify (cheese) {price = 5 };\nretract (cheese)" );

        final PackageBuilderConfiguration conf = pkgBuilder.getPackageBuilderConfiguration();

        DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectCompiletimeRegistry();
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    }

    @Test
    public void testImperativeCodeError() throws Exception {
        final Package pkg = new Package( "pkg1" );
        final RuleDescr ruleDescr = new RuleDescr( "rule 1" );
        ruleDescr.setConsequence( "if (cheese.price == 10) { cheese.price = 5; }" );

        Properties properties = new Properties();
        properties.setProperty( "drools.dialect.default",
                                "mvel" );
        PackageBuilderConfiguration cfg1 = new PackageBuilderConfiguration( properties );
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Related Classes of org.drools.lang.descr.RuleDescr

  • org.drools.clips.LhsClpParserTest
  • org.drools.compiler.PackageBuilder
  • org.drools.compiler.PackageBuilderConfigurationTest
  • org.drools.compiler.PackageBuilderTest
  • org.drools.compiler.QueryBuilderTest
  • org.drools.compiler.RuleErrorTest
  • org.drools.compiler.xml.rules.AndHandler
  • org.drools.compiler.xml.rules.OrHandler
  • org.drools.compiler.xml.rules.RuleHandler
  • org.drools.compiler.xml.rules.XmlPackageReaderTest
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