public String generate()

in kogito-codegen-modules/kogito-codegen-decisions/src/main/java/org/kie/kogito/codegen/decision/DecisionRestResourceGenerator.java [116:195]
62 lines of code
8 McCabe index (conditional complexity)

    public String generate() {
        CompilationUnit clazz = generator.compilationUnitOrThrow("Cannot generate Decision REST Resource");

        ClassOrInterfaceDeclaration template = clazz
                .findFirst(ClassOrInterfaceDeclaration.class)
                .orElseThrow(() -> new NoSuchElementException("Compilation unit doesn't contain a class or interface declaration!"));

        template.setName(resourceClazzName);

        template.findAll(StringLiteralExpr.class).forEach(this::interpolateStrings);
        template.findAll(MethodDeclaration.class).forEach(this::interpolateMethods);

        interpolateInputType(template);
        interpolateInputData(template);
        interpolateExtractContextMethod(template);
        modifyDmnMethodForStronglyTyped(template);
        chooseMethodForStronglyTyped(template);

        if (context.hasDI()) {
            template.findAll(FieldDeclaration.class,
                    CodegenUtils::isApplicationField).forEach(fd -> context.getDependencyInjectionAnnotator().withInjection(fd));
        } else {
            template.findAll(FieldDeclaration.class,
                    CodegenUtils::isApplicationField).forEach(this::initializeApplicationField);
        }

        MethodDeclaration dmnMethod = template.findAll(MethodDeclaration.class, x -> x.getName().toString().equals("dmn")).get(0);
        processOASAnn(dmnMethod, null);

        final String dmnMethodUrlPlaceholder = "$dmnMethodUrl$";

        template.addMember(cloneForDMNResult(dmnMethod, "dmn_dmnresult", "dmnresult", dmnMethodUrlPlaceholder));
        for (DecisionService ds : dmnModel.getDefinitions().getDecisionService()) {
            if (ds.getAdditionalAttributes().keySet().stream().anyMatch(qn -> qn.getLocalPart().equals("dynamicDecisionService"))) {
                continue;
            }

            MethodDeclaration clonedMethod = dmnMethod.clone();
            processOASAnn(clonedMethod, ds);
            String name = CodegenStringUtil.escapeIdentifier("decisionService_" + ds.getName());
            clonedMethod.setName(name);
            MethodCallExpr evaluateCall = clonedMethod.findFirst(MethodCallExpr.class, x -> x.getNameAsString().equals("evaluateAll")).orElseThrow(TEMPLATE_WAS_MODIFIED);
            evaluateCall.setName(new SimpleName("evaluateDecisionService"));
            evaluateCall.addArgument(new StringLiteralExpr(ds.getName()));
            MethodCallExpr ctxCall = clonedMethod.findFirst(MethodCallExpr.class, x -> x.getNameAsString().equals("ctx")).orElseThrow(TEMPLATE_WAS_MODIFIED);
            ctxCall.addArgument(new StringLiteralExpr(ds.getName()));

            //insert request path
            final String path = ds.getName();
            interpolateRequestPath(path, dmnMethodUrlPlaceholder, clonedMethod);

            ReturnStmt returnStmt = clonedMethod.findFirst(ReturnStmt.class).orElseThrow(TEMPLATE_WAS_MODIFIED);
            if (ds.getOutputDecision().size() == 1) {
                MethodCallExpr rewrittenReturnExpr = returnStmt.findFirst(MethodCallExpr.class,
                        mce -> mce.getNameAsString().equals("extractContextIfSucceded") || mce.getNameAsString().equals("extractStronglyTypedContextIfSucceded"))
                        .orElseThrow(TEMPLATE_WAS_MODIFIED);
                rewrittenReturnExpr.setName("extractSingletonDSIfSucceded");
            }

            if (context.getAddonsConfig().useMonitoring()) {
                addMonitoringToMethod(clonedMethod, ds.getName());
            }

            template.addMember(clonedMethod);
            template.addMember(cloneForDMNResult(clonedMethod, name + "_dmnresult", ds.getName() + "/dmnresult", path));
        }

        //set the root path for the dmnMethod itself
        interpolateRequestPath("", dmnMethodUrlPlaceholder, dmnMethod);

        if (context.getAddonsConfig().useMonitoring()) {
            addMonitoringImports(clazz);
            addMonitoringFields(template);
            addExceptionMetricsLogging(clazz, nameURL);
            addMonitoringToMethod(dmnMethod, nameURL);
        }

        template.getMembers().sort(new BodyDeclarationComparator());
        return clazz.toString();
    }