Package org.drools.rule.builder.dialect.mvel

Examples of org.drools.rule.builder.dialect.mvel.MVELDialect

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        ActionDescr actionDescr = new ActionDescr();
        actionDescr.setText( "list.add( 'hello world' )" );      

        PackageBuilder pkgBuilder = new PackageBuilder( pkg );
        DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectCompiletimeRegistry();
        MVELDialect mvelDialect = ( MVELDialect ) dialectRegistry.getDialect( "mvel" );

        PackageBuildContext context = new PackageBuildContext();
        context.init( pkgBuilder, pkg, null, dialectRegistry, mvelDialect, null);
       
        pkgBuilder.addPackageFromDrl( new StringReader("package pkg1;\nglobal java.util.List list;\n") );       
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        ReturnValueDescr descr = new ReturnValueDescr();
        descr.setText( "return value" );

        PackageBuilder pkgBuilder = new PackageBuilder( pkg );
        DialectCompiletimeRegistry dialectRegistry = pkgBuilder.getPackageRegistry( pkg.getName() ).getDialectCompiletimeRegistry();
        MVELDialect mvelDialect = (MVELDialect) dialectRegistry.getDialect( "mvel" );

        PackageBuildContext context = new PackageBuildContext();
        context.init( pkgBuilder,
                      pkg,
                      null,
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        actionDescr.setText( "list.add( 'hello world' )" );      

        PackageBuilder pkgBuilder = new PackageBuilder( pkg );
       
        PackageRegistry pkgReg = pkgBuilder.getPackageRegistry( pkg.getName() );
        MVELDialect mvelDialect = ( MVELDialect ) pkgReg.getDialectCompiletimeRegistry().getDialect( "mvel" );

        PackageBuildContext context = new PackageBuildContext();
        context.init( pkgBuilder, pkg, null, pkgReg.getDialectCompiletimeRegistry(), mvelDialect, null);
       
        pkgBuilder.addPackageFromDrl( new StringReader("package pkg1;\nglobal java.util.List list;\n") );       
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                      final ContextResolver contextResolver) {

        String text = descr.getText();

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

            boolean typeSafe = context.isTypesafe();
           
            Map<String, Class<?>> variables = new HashMap<String,Class<?>>();
           
            context.setTypesafe( false ); // we can't know all the types ahead of time with processes, but we don't need return types, so it's ok
            BoundIdentifiers boundIdentifiers = new BoundIdentifiers(variables, context.getPackageBuilder().getGlobals());
            MVELAnalysisResult analysis = ( MVELAnalysisResult ) dialect.analyzeBlock( context,
                                                                                       descr,
                                                                                       dialect.getInterceptors(),
                                                                                       text,
                                                                                       boundIdentifiers,
                                                                                       null,
                                                                                       "context",
                                                                                       org.drools.runtime.process.ProcessContext.class );                     
            context.setTypesafe( typeSafe );

            Set<String> variableNames = analysis.getNotBoundedIdentifiers();
            if (contextResolver != null) {
                for (String variableName: variableNames) {
                    if (  analysis.getMvelVariables().keySet().contains( variableName ) ||  variableName.equals( "kcontext" ) || variableName.equals( "context" ) ) {
                        continue;
                    }                   
                    VariableScope variableScope = (VariableScope) contextResolver.resolveContext(VariableScope.VARIABLE_SCOPE, variableName);
                    if (variableScope == null) {
                        context.getErrors().add(
                            new DescrBuildError(
                                context.getParentDescr(),
                                descr,
                                null,
                                "Could not find variable '" + variableName + "' for action '" + descr.getText() + "'" ) );                   
                    } else {
                        variables.put(variableName,
                                      context.getDialect().getTypeResolver().resolveType(variableScope.findVariable(variableName).getType().getStringType()));
                    }
                }
            }

            MVELCompilationUnit unit = dialect.getMVELCompilationUnit( text,
                                                                       analysis,
                                                                       null,
                                                                       null,
                                                                       variables,
                                                                       context,
                                                                       "context",
                                                                       org.drools.runtime.process.ProcessContext.class);             
            //VELReturnValueExpression expr = new MVELReturnValueExpression( unit, context.getDialect().getId() );

            MVELReturnValueEvaluator expr = new MVELReturnValueEvaluator( unit,
                                                                          dialect.getId() );
//            expr.setVariableNames(variableNames);

            constraintNode.setEvaluator( expr );
           
            MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( dialect.getId() );
            data.addCompileable( constraintNode,
                                  expr );
           
            expr.compile( data );
        } catch ( final Exception e ) {
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                      final ContextResolver contextResolver) {

        String text = processMacros( actionDescr.getText() );

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

            boolean typeSafe = context.isTypesafe();
           
            Map<String, Class<?>> variables = new HashMap<String,Class<?>>();
           
            context.setTypesafe( false ); // we can't know all the types ahead of time with processes, but we don't need return types, so it's ok
            BoundIdentifiers boundIdentifiers = new BoundIdentifiers(variables, context.getPackageBuilder().getGlobals());
            MVELAnalysisResult analysis = ( MVELAnalysisResult ) dialect.analyzeBlock( context,
                                                                                       actionDescr,
                                                                                       dialect.getInterceptors(),
                                                                                       text,
                                                                                       boundIdentifiers,
                                                                                       null,
                                                                                       "context",
                                                                                       org.drools.runtime.process.ProcessContext.class );                      
            context.setTypesafe( typeSafe );
           
            Set<String> variableNames = analysis.getNotBoundedIdentifiers();
            if (contextResolver != null) {
              for (String variableName: variableNames) {
                  if ( analysis.getMvelVariables().keySet().contains( variableName ) ||  variableName.equals( "kcontext" ) || variableName.equals( "context" ) ) {
                      continue;
                  }
                VariableScope variableScope = (VariableScope) contextResolver.resolveContext(VariableScope.VARIABLE_SCOPE, variableName);
                if (variableScope == null) {
                  context.getErrors().add(
                  new DescrBuildError(
                  context.getParentDescr(),
                              actionDescr,
                              null,
                              "Could not find variable '" + variableName + "' for action '" + actionDescr.getText() + "'" ) );               
                } else {
                  variables.put(variableName,
                                context.getDialect().getTypeResolver().resolveType(variableScope.findVariable(variableName).getType().getStringType()));
                }
              }
            }

            MVELCompilationUnit unit = dialect.getMVELCompilationUnit( text,
                                                                       analysis,
                                                                       null,
                                                                       null,
                                                                       variables,
                                                                       context,
                                                                       "context",
                                                                       org.drools.runtime.process.ProcessContext.class);             
            MVELAction expr = new MVELAction( unit, context.getDialect().getId() );
           
           
            action.setMetaData("Action",  expr );
           
            MVELDialectRuntimeData data = (MVELDialectRuntimeData) context.getPkg().getDialectRuntimeRegistry().getDialectData( dialect.getId() );           
            data.addCompileable( action,
                                  expr ); 
           
            expr.compile( data );
        } catch ( final Exception e ) {
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                                          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 );
        pdescr.copyLocation( base );
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        } 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,
                                                                           context,
                                                                           false );
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                        null,
                        "Predicate '" + predicateDescr.getContent() + "' must be a Boolean expression\n" + predicateDescr.positionAsString() ) );
            }
        }

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

        MVELCompilationUnit unit = null;

        try {
            Map<String, Class< ? >> declIds = context.getDeclarationResolver().getDeclarationClasses( context.getRule() );

            Pattern p = (Pattern) context.getBuildStack().peek();
            if ( p.getObjectType() instanceof ClassObjectType) {
                declIds.put( "this",
                        ((ClassObjectType) p.getObjectType()).getClassType() );
            }

            unit = dialect.getMVELCompilationUnit( (String) predicateDescr.getContent(),
                                                    analysis,
                                                    previousDeclarations,
                                                    localDeclarations,
                                                    null,
                                                    context,
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    public static String fixBlockDescr(final RuleBuildContext context,
                                       final JavaAnalysisResult analysis,
                                       Map<String, Declaration> decls,
                                       List<JavaBlockDescr> blocks) {

        MVELDialect mvel = (MVELDialect) context.getDialect("mvel");


        String originalCode = analysis.getAnalyzedExpr();
        BoundIdentifiers bindings = analysis.getBoundIdentifiers();
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    private static Map<String, Class<?>> getInputs(final RuleBuildContext context,
                                                   String code,
                                                   BoundIdentifiers bindings,
                                                   Map<String, Class<?>> parentVars) {
        MVELDialect mvel = (MVELDialect) context.getDialect("mvel");

        MVELAnalysisResult mvelAnalysis = null;
        try {
            mvelAnalysis = (MVELAnalysisResult) mvel.analyzeBlock(context,
                    context.getRuleDescr(),
                    null,
                    code,
                    bindings,
                    parentVars,
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Related Classes of org.drools.rule.builder.dialect.mvel.MVELDialect

  • org.drools.base.ModifyInterceptor
  • org.drools.base.mvel.DroolsMVELKnowledgeHelper
  • org.drools.base.mvel.MVELCompilationUnit
  • org.drools.commons.jci.readers.MemoryResourceReader
  • org.drools.compiler.AnalysisResult
  • org.drools.compiler.DescrBuildError
  • org.drools.compiler.ImportError
  • org.drools.compiler.PackageBuilder
  • org.drools.compiler.RuleError
  • org.drools.eclipse.editors.completion.RuleCompletionProcessor
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