com.github.javaparser.ast.expr.ThisExpr Java Examples

private MethodDeclaration createInstanceMethod(String processInstanceFQCN) {
    MethodDeclaration methodDeclaration = new MethodDeclaration();

    ReturnStmt returnStmt = new ReturnStmt(
            new ObjectCreationExpr()
                    .setType(processInstanceFQCN)
                    .setArguments(NodeList.nodeList(
                            new ThisExpr(),
                            new NameExpr("value"),
                            createProcessRuntime())));

    methodDeclaration.setName("createInstance")
            .addModifier(Modifier.Keyword.PUBLIC)
            .addParameter(modelTypeName, "value")
            .setType(processInstanceFQCN)
            .setBody(new BlockStmt()
                             .addStatement(returnStmt));
    return methodDeclaration;
}
 

private MethodDeclaration createInstanceWithBusinessKeyMethod(String processInstanceFQCN) {
    MethodDeclaration methodDeclaration = new MethodDeclaration();

    ReturnStmt returnStmt = new ReturnStmt(
            new ObjectCreationExpr()
                    .setType(processInstanceFQCN)
                    .setArguments(NodeList.nodeList(
                            new ThisExpr(),
                            new NameExpr("value"),
                            new NameExpr(BUSINESS_KEY),
                            createProcessRuntime())));

    methodDeclaration.setName("createInstance")
            .addModifier(Modifier.Keyword.PUBLIC)
            .addParameter(String.class.getCanonicalName(), BUSINESS_KEY)
            .addParameter(modelTypeName, "value")
            .setType(processInstanceFQCN)
            .setBody(new BlockStmt()
                             .addStatement(returnStmt));
    return methodDeclaration;
}
 

private MethodDeclaration createInstanceGenericWithBusinessKeyMethod(String processInstanceFQCN) {
    MethodDeclaration methodDeclaration = new MethodDeclaration();

    ReturnStmt returnStmt = new ReturnStmt(
            new MethodCallExpr(new ThisExpr(), "createInstance")
            .addArgument(new NameExpr(BUSINESS_KEY))
            .addArgument(new CastExpr(new ClassOrInterfaceType(null, modelTypeName), new NameExpr("value"))));

    methodDeclaration.setName("createInstance")
            .addModifier(Modifier.Keyword.PUBLIC)
            .addParameter(String.class.getCanonicalName(), BUSINESS_KEY)
            .addParameter(Model.class.getCanonicalName(), "value")
            .setType(processInstanceFQCN)
            .setBody(new BlockStmt()
                             .addStatement(returnStmt));
    return methodDeclaration;
}
 

@Override
public List<Statement> setupStatements() {
    return Collections.singletonList(
            new IfStmt(
                    new BinaryExpr(
                            new MethodCallExpr(new MethodCallExpr(null, "config"), "decision"),
                            new NullLiteralExpr(),
                            BinaryExpr.Operator.NOT_EQUALS
                    ),
                    new BlockStmt().addStatement(new ExpressionStmt(new MethodCallExpr(
                            new NameExpr("decisionModels"), "init", NodeList.nodeList(new ThisExpr())
                    ))),
                    null
            )
    );
}
 

private MethodDeclaration generateExtractEventListenerConfigMethod() {
    BlockStmt body = new BlockStmt().addStatement(new ReturnStmt(
            new MethodCallExpr(new ThisExpr(), METHOD_MERGE_DECISION_EVENT_LISTENER_CONFIG, nodeList(
                    annotator.getMultiInstance(VAR_DECISION_EVENT_LISTENER_CONFIG),
                    annotator.getMultiInstance(VAR_DMN_RUNTIME_EVENT_LISTENERS)
            ))
    ));

    return method(Modifier.Keyword.PRIVATE, DecisionEventListenerConfig.class, METHOD_EXTRACT_DECISION_EVENT_LISTENER_CONFIG, body);
}
 

@Override
public void visit(final ThisExpr n, final Void arg) {
    printJavaComment(n.getComment(), arg);
    if (n.getClassExpr().isPresent()) {
        n.getClassExpr().get().accept(this, arg);
        printer.print(".");
    }
    printer.print("this");
}
 

public String generate() {
    CompilationUnit clazz = parse(
            this.getClass().getResourceAsStream("/class-templates/MessageProducerTemplate.java"));
    clazz.setPackageDeclaration(process.getPackageName());

    ClassOrInterfaceDeclaration template = clazz.findFirst(ClassOrInterfaceDeclaration.class).get();
    template.setName(resourceClazzName);        
    
    template.findAll(ClassOrInterfaceType.class).forEach(cls -> interpolateTypes(cls, trigger.getDataType()));
    template.findAll(MethodDeclaration.class).stream().filter(md -> md.getNameAsString().equals("produce")).forEach(md -> md.getParameters().stream().filter(p -> p.getNameAsString().equals(EVENT_DATA_VAR)).forEach(p -> p.setType(trigger.getDataType())));
    template.findAll(MethodDeclaration.class).stream().filter(md -> md.getNameAsString().equals("configure")).forEach(md -> md.addAnnotation("javax.annotation.PostConstruct"));
    template.findAll(MethodDeclaration.class).stream().filter(md -> md.getNameAsString().equals("marshall")).forEach(md -> {
        md.getParameters().stream().filter(p -> p.getNameAsString().equals(EVENT_DATA_VAR)).forEach(p -> p.setType(trigger.getDataType()));
        md.findAll(ClassOrInterfaceType.class).forEach(t -> t.setName(t.getNameAsString().replace("$DataEventType$", messageDataEventClassName)));
    });
    
    if (useInjection()) {
        annotator.withApplicationComponent(template);
        
        FieldDeclaration emitterField = template.findFirst(FieldDeclaration.class).filter(fd -> fd.getVariable(0).getNameAsString().equals("emitter")).get();
        annotator.withInjection(emitterField);
        annotator.withOutgoingMessage(emitterField, trigger.getName());
        emitterField.getVariable(0).setType(annotator.emitterType("String"));
        
        MethodDeclaration produceMethod = template.findAll(MethodDeclaration.class).stream().filter(md -> md.getNameAsString().equals("produce")).findFirst().orElseThrow(() -> new IllegalStateException("Cannot find produce methos in MessageProducerTemplate"));
        BlockStmt body = new BlockStmt();
        MethodCallExpr sendMethodCall = new MethodCallExpr(new NameExpr("emitter"), "send");
        annotator.withMessageProducer(sendMethodCall, trigger.getName(), new MethodCallExpr(new ThisExpr(), "marshall").addArgument(new NameExpr("pi")).addArgument(new NameExpr(EVENT_DATA_VAR)));
        body.addStatement(sendMethodCall);
        produceMethod.setBody(body);

        template.findAll(FieldDeclaration.class,
                fd -> fd.getVariable(0).getNameAsString().equals("useCloudEvents")).forEach(fd -> annotator.withConfigInjection(fd, "kogito.messaging.as-cloudevents"));
        
    } 
    template.getMembers().sort(new BodyDeclarationComparator());
    return clazz.toString();
}
 

private MethodDeclaration generateExtractEventListenerConfigMethod() {
    BlockStmt body = new BlockStmt().addStatement(new ReturnStmt(
            new MethodCallExpr(new ThisExpr(), METHOD_MERGE_RULE_EVENT_LISTENER_CONFIG, NodeList.nodeList(
                    annotator.getMultiInstance(VAR_RULE_EVENT_LISTENER_CONFIGS),
                    annotator.getMultiInstance(VAR_AGENDA_EVENT_LISTENERS),
                    annotator.getMultiInstance(VAR_RULE_RUNTIME_EVENT_LISTENERS)
            ))
    ));

    return method(Modifier.Keyword.PRIVATE, RuleEventListenerConfig.class, METHOD_EXTRACT_RULE_EVENT_LISTENER_CONFIG, body);
}
 

private MethodDeclaration generateExtractEventListenerConfigMethod() {
    BlockStmt body = new BlockStmt().addStatement(new ReturnStmt(
            new MethodCallExpr(new ThisExpr(), METHOD_MERGE_PROCESS_EVENT_LISTENER_CONFIG, NodeList.nodeList(
                    annotator.getMultiInstance(VAR_PROCESS_EVENT_LISTENER_CONFIGS),
                    annotator.getMultiInstance(VAR_PROCESS_EVENT_LISTENERS)
            ))
    ));

    return method(Modifier.Keyword.PRIVATE, ProcessEventListenerConfig.class, METHOD_EXTRACT_PROCESS_EVENT_LISTENER_CONFIG, body);
}
 

private MethodDeclaration createInstanceGenericMethod(String processInstanceFQCN) {
    MethodDeclaration methodDeclaration = new MethodDeclaration();

    ReturnStmt returnStmt = new ReturnStmt(
            new MethodCallExpr(new ThisExpr(), "createInstance").addArgument(new CastExpr(new ClassOrInterfaceType(null, modelTypeName), new NameExpr("value"))));

    methodDeclaration.setName("createInstance")
            .addModifier(Modifier.Keyword.PUBLIC)
            .addParameter(Model.class.getCanonicalName(), "value")
            .setType(processInstanceFQCN)
            .setBody(new BlockStmt()
                             .addStatement(returnStmt));
    return methodDeclaration;
}
 

@Override
public ClassOrInterfaceDeclaration classDeclaration() {

    NodeList<BodyDeclaration<?>> declarations = new NodeList<>();

    // declare field `application`
    FieldDeclaration applicationFieldDeclaration = new FieldDeclaration();
    applicationFieldDeclaration
            .addVariable( new VariableDeclarator( new ClassOrInterfaceType(null, "Application"), "application") )
            .setModifiers( Modifier.Keyword.PRIVATE, Modifier.Keyword.FINAL );
    declarations.add(applicationFieldDeclaration);

    ConstructorDeclaration constructorDeclaration = new ConstructorDeclaration("RuleUnits")
            .addModifier(Modifier.Keyword.PUBLIC)
            .addParameter( "Application", "application" )
            .setBody( new BlockStmt().addStatement( "this.application = application;" ) );
    declarations.add(constructorDeclaration);

    // declare field `ruleRuntimeBuilder`
    FieldDeclaration kieRuntimeFieldDeclaration = new FieldDeclaration();
    kieRuntimeFieldDeclaration
            .addVariable(new VariableDeclarator( new ClassOrInterfaceType(null, KieRuntimeBuilder.class.getCanonicalName()), "ruleRuntimeBuilder")
            .setInitializer(new ObjectCreationExpr().setType(ProjectSourceClass.PROJECT_RUNTIME_CLASS)))
            .setModifiers( Modifier.Keyword.PRIVATE, Modifier.Keyword.FINAL );
    declarations.add(kieRuntimeFieldDeclaration);

    // declare method ruleRuntimeBuilder()
    MethodDeclaration methodDeclaration = new MethodDeclaration()
            .addModifier(Modifier.Keyword.PUBLIC)
            .setName("ruleRuntimeBuilder")
            .setType(KieRuntimeBuilder.class.getCanonicalName())
            .setBody(new BlockStmt().addStatement(new ReturnStmt(new FieldAccessExpr(new ThisExpr(), "ruleRuntimeBuilder"))));
    declarations.add(methodDeclaration);

    declarations.addAll(factoryMethods);
    declarations.add(genericFactoryById());

    ClassOrInterfaceDeclaration cls = super.classDeclaration()
            .setMembers(declarations);

    cls.getMembers().sort(new BodyDeclarationComparator());

    return cls;
}
 

private MethodCallExpr createProcessRuntime() {
    return new MethodCallExpr(
            new ThisExpr(),
            "createLegacyProcessRuntime");
}
 

public MethodCallExpr fromMap(String variableName, String mapVarName) {
    return new MethodCallExpr(new NameExpr(variableName), "fromMap").addArgument(new MethodCallExpr(new ThisExpr(), "id")).addArgument(mapVarName);
}
 

@SuppressWarnings({"unchecked"})
private CompilationUnit compilationUnitOutput() {
    CompilationUnit compilationUnit = parse(this.getClass().getResourceAsStream("/class-templates/TaskOutputTemplate.java"));
    compilationUnit.setPackageDeclaration(packageName);
    Optional<ClassOrInterfaceDeclaration> processMethod = compilationUnit.findFirst(ClassOrInterfaceDeclaration.class, sl1 -> true);

    if (!processMethod.isPresent()) {
        throw new RuntimeException("Cannot find class declaration in the template");
    }
    ClassOrInterfaceDeclaration modelClass = processMethod.get();
    compilationUnit.addOrphanComment(new LineComment("Task output model for user task '" + humanTaskNode.getName() + "' in process '" + processId + "'"));
    addUserTaskAnnotation(modelClass);
    modelClass.setName(outputModelClassSimpleName);

    // setup of the toMap method body
    BlockStmt toMapBody = new BlockStmt();
    ClassOrInterfaceType toMap = new ClassOrInterfaceType(null, new SimpleName(Map.class.getSimpleName()), NodeList.nodeList(new ClassOrInterfaceType(null, String.class.getSimpleName()), new ClassOrInterfaceType(
                                                                                                                                                                                                                    null,
                                                                                                                                                                                                                    Object.class.getSimpleName())));
    VariableDeclarationExpr paramsField = new VariableDeclarationExpr(toMap, "params");
    toMapBody.addStatement(new AssignExpr(paramsField, new ObjectCreationExpr(null, new ClassOrInterfaceType(null, HashMap.class.getSimpleName()), NodeList.nodeList()), AssignExpr.Operator.ASSIGN));

    for (Entry<String, String> entry : humanTaskNode.getOutMappings().entrySet()) {
        if (entry.getValue() == null || INTERNAL_FIELDS.contains(entry.getKey())) {
            continue;
        }

        Variable variable = Optional.ofNullable(variableScope.findVariable(entry.getValue()))
                .orElse(processVariableScope.findVariable(entry.getValue()));

        if (variable == null) {
            // check if given mapping is an expression
            Matcher matcher = PatternConstants.PARAMETER_MATCHER.matcher(entry.getValue());
            if (matcher.find()) {
                Map<String, String> dataOutputs = (Map<String, String>) humanTaskNode.getMetaData("DataOutputs");
                variable = new Variable();
                variable.setName(entry.getKey());
                variable.setType(new ObjectDataType(dataOutputs.get(entry.getKey())));
            } else {
                throw new IllegalStateException("Task " + humanTaskNode.getName() +" (output) " + entry.getKey() + " reference not existing variable " + entry.getValue());
            }
        }

        FieldDeclaration fd = new FieldDeclaration().addVariable(
                                                                 new VariableDeclarator()
                                                                                         .setType(variable.getType().getStringType())
                                                                                         .setName(entry.getKey()))
                                                    .addModifier(Modifier.Keyword.PRIVATE);
        modelClass.addMember(fd);
        addUserTaskParamAnnotation(fd, UserTaskParam.ParamType.OUTPUT);

        fd.createGetter();
        fd.createSetter();

        // toMap method body
        MethodCallExpr putVariable = new MethodCallExpr(new NameExpr("params"), "put");
        putVariable.addArgument(new StringLiteralExpr(entry.getKey()));
        putVariable.addArgument(new FieldAccessExpr(new ThisExpr(), entry.getKey()));
        toMapBody.addStatement(putVariable);
    }

    Optional<MethodDeclaration> toMapMethod = modelClass.findFirst(MethodDeclaration.class, sl -> sl.getName().asString().equals("toMap"));

    toMapBody.addStatement(new ReturnStmt(new NameExpr("params")));
    toMapMethod.ifPresent(methodDeclaration -> methodDeclaration.setBody(toMapBody));
    return compilationUnit;
}
 

@Override
public void visit(ThisExpr n, Void arg) {
    out.println("ThisExpr: " + (extended ? n : n));
    super.visit(n, arg);
}
 

@Override public ThisExpr doMerge(ThisExpr first, ThisExpr second) {
  ThisExpr te = new ThisExpr();

  te.setClassExpr(mergeSingle(first.getClassExpr(),second.getClassExpr()));

  return te;
}
 

/**
 * Generates something like
 * <code>P_INDEX_UPDATER.lazySet(this, newValue)</code>
 *
 * @param fieldUpdaterFieldName
 * @param newValueName
 * @return
 */
protected BlockStmt fieldUpdaterLazySet(String fieldUpdaterFieldName, String newValueName) {
    BlockStmt body = new BlockStmt();
    body.addStatement(new ExpressionStmt(
            methodCallExpr(fieldUpdaterFieldName, "lazySet", new ThisExpr(), new NameExpr(newValueName))));
    return body;
}
 

/**
 * Generates something like
 * <code>return P_INDEX_UPDATER.compareAndSet(this, expectedValue, newValue)</code>
 *
 * @param fieldUpdaterFieldName
 * @param expectedValueName
 * @param newValueName
 * @return
 */
protected BlockStmt fieldUpdaterCompareAndSet(String fieldUpdaterFieldName, String expectedValueName,
        String newValueName) {
    BlockStmt body = new BlockStmt();
    body.addStatement(new ReturnStmt(methodCallExpr(fieldUpdaterFieldName, "compareAndSet", new ThisExpr(),
            new NameExpr(expectedValueName), new NameExpr(newValueName))));
    return body;
}
 

/**
 * Generates something like
 * <code>return P_INDEX_UPDATER.getAndSet(this, newValue)</code>
 *
 * @param fieldUpdaterFieldName
 * @param newValueName
 * @return
 */
private BlockStmt fieldUpdaterGetAndSet(String fieldUpdaterFieldName, String newValueName) {
    BlockStmt body = new BlockStmt();
    body.addStatement(new ReturnStmt(
            methodCallExpr(fieldUpdaterFieldName, "getAndSet", new ThisExpr(), new NameExpr(newValueName))));
    return body;
}
 

@Override public boolean doIsEquals(ThisExpr first, ThisExpr second) {

    if(!isEqualsUseMerger(first.getClassExpr(),second.getClassExpr())) return false;

    return true;
  }