@Override
public String evaluateTemplate(String expressionTemplate, Map<String, Object> evaluationContext) {
    Optional.ofNullable(expressionTemplate)
        .filter(template -> !template.isEmpty())
        .orElseThrow(() -> new IllegalArgumentException("Expression template cannot be null or empty"));

    Optional.ofNullable(evaluationContext)
        .orElseThrow(() -> new IllegalArgumentException("Evaluation context cannot be null"));

    Expression expression = new SpelExpressionParser().parseExpression(expressionTemplate
            ,new TemplateParserContext("@{","}"));

    StandardEvaluationContext standardEvaluationContext = new StandardEvaluationContext();
    try {
        standardEvaluationContext.registerFunction("urlEncode",
                Functions.class.getDeclaredMethod("urlEncode", new Class[] {String.class}));
    } catch (NoSuchMethodException e) {
        throw new EvaluationException("Fail to register function to evaluation context", e);
    }
    standardEvaluationContext.addPropertyAccessor(new MapAccessor());
    standardEvaluationContext.setVariables(evaluationContext);

    return expression.getValue(standardEvaluationContext,String.class);
}
 

@Override
public boolean evaluateConditional(String conditionalExpression, Map<String, Object> evaluationContext) {
    Optional.ofNullable(conditionalExpression)
            .filter(template -> !template.isEmpty())
            .orElseThrow(() -> new IllegalArgumentException("Conditional expression cannot be null or empty"));

    Optional.ofNullable(evaluationContext)
            .orElseThrow(() -> new IllegalArgumentException("Evaluation context cannot be null"));

    Expression expression = new SpelExpressionParser().parseExpression(conditionalExpression);

    StandardEvaluationContext standardEvaluationContext = new StandardEvaluationContext();
    standardEvaluationContext.addPropertyAccessor(new MapAccessor());
    standardEvaluationContext.setVariables(evaluationContext);

    return expression.getValue(standardEvaluationContext,Boolean.class);
}
 

/**
 * 创建SpEL执行上下文
 *
 * @param rootObject
 *            SpEL表达式根对象
 * @param context
 *            Beetl上下文对象
 * @return SpEL表达式执行上下文
 */
private EvaluationContext createEvaluationContext(Object rootObject, Context beetlContext) {
	StandardEvaluationContext context = new StandardEvaluationContext(rootObject);

	// 允许使用#context访问Beetl上下文
	context.setVariable("context", beetlContext);
	// 允许使用#global访问Beetl上下文的全局变量
	context.setVariable("global", beetlContext.globalVar);
	// 注册WebRender定义的全局变量
	context.setVariable("ctxPath", beetlContext.getGlobal("ctxPath"));
	context.setVariable("servlet", beetlContext.getGlobal("servlet"));
	context.setVariable("parameter", beetlContext.getGlobal("parameter"));
	context.setVariable("request", beetlContext.getGlobal("request"));
	context.setVariable("session", beetlContext.getGlobal("session"));
	// 允许使用属性格式访问Map
	context.addPropertyAccessor(new MapAccessor());
	// 允许访问Spring容器Bean
	context.setBeanResolver(new BeanFactoryResolver(applicationContext));

	return context;
}
 

private EvaluationContext createEvaluationContext(PageContext pageContext) {
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.addPropertyAccessor(new JspPropertyAccessor(pageContext));
	context.addPropertyAccessor(new MapAccessor());
	context.addPropertyAccessor(new EnvironmentAccessor());
	context.setBeanResolver(new BeanFactoryResolver(getRequestContext().getWebApplicationContext()));
	ConversionService conversionService = getConversionService(pageContext);
	if (conversionService != null) {
		context.setTypeConverter(new StandardTypeConverter(conversionService));
	}
	return context;
}
 

@Nullable
protected String getDescription(InstanceEvent event, Instance instance) {
    Map<String, Object> root = new HashMap<>();
    root.put("event", event);
    root.put("instance", instance);
    root.put("lastStatus", getLastStatus(event.getInstance()));
    StandardEvaluationContext context = new StandardEvaluationContext(root);
    context.addPropertyAccessor(new MapAccessor());

    return description.getValue(context, String.class);
}
 

@Nullable
protected String getText(InstanceEvent event, Instance instance) {
    Map<String, Object> root = new HashMap<>();
    root.put("event", event);
    root.put("instance", instance);
    root.put("lastStatus", getLastStatus(event.getInstance()));
    StandardEvaluationContext context = new StandardEvaluationContext(root);
    context.addPropertyAccessor(new MapAccessor());
    return message.getValue(context, String.class);
}
 

@Nullable
protected String getMessage(InstanceEvent event, Instance instance) {
    Map<String, Object> root = new HashMap<>();
    root.put("event", event);
    root.put("instance", instance);
    root.put("lastStatus", getLastStatus(event.getInstance()));
    StandardEvaluationContext context = new StandardEvaluationContext(root);
    context.addPropertyAccessor(new MapAccessor());
    return description.getValue(context, String.class);
}
 

@Nullable
protected String getText(InstanceEvent event, Instance instance) {
    Map<String, Object> root = new HashMap<>();
    root.put("event", event);
    root.put("instance", instance);
    root.put("lastStatus", getLastStatus(event.getInstance()));
    StandardEvaluationContext context = new StandardEvaluationContext(root);
    context.addPropertyAccessor(new MapAccessor());
    return message.getValue(context, String.class);
}
 

@Nullable
protected String getText(InstanceEvent event, Instance instance) {
    Map<String, Object> root = new HashMap<>();
    root.put("event", event);
    root.put("instance", instance);
    root.put("lastStatus", getLastStatus(event.getInstance()));
    StandardEvaluationContext context = new StandardEvaluationContext(root);
    context.addPropertyAccessor(new MapAccessor());
    return message.getValue(context, String.class);
}
 

@Nullable
protected String createContent(InstanceEvent event, Instance instance) {
    Map<String, Object> root = new HashMap<>();
    root.put("event", event);
    root.put("instance", instance);
    root.put("lastStatus", getLastStatus(event.getInstance()));
    StandardEvaluationContext context = new StandardEvaluationContext(root);
    context.addPropertyAccessor(new MapAccessor());
    return message.getValue(context, String.class);
}
 

@Nullable
protected String getMessage(InstanceEvent event, Instance instance) {
    Map<String, Object> root = new HashMap<>();
    root.put("event", event);
    root.put("instance", instance);
    root.put("lastStatus", getLastStatus(event.getInstance()));
    StandardEvaluationContext context = new StandardEvaluationContext(root);
    context.addPropertyAccessor(new MapAccessor());
    return description.getValue(context, String.class);
}
 

private EvaluationContext createEvaluationContext(PageContext pageContext) {
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.addPropertyAccessor(new JspPropertyAccessor(pageContext));
	context.addPropertyAccessor(new MapAccessor());
	context.addPropertyAccessor(new EnvironmentAccessor());
	context.setBeanResolver(new BeanFactoryResolver(getRequestContext().getWebApplicationContext()));
	ConversionService conversionService = getConversionService(pageContext);
	if (conversionService != null) {
		context.setTypeConverter(new StandardTypeConverter(conversionService));
	}
	return context;
}
 

@Override
public Object evaluate(final Map<String, Object> context) {
    if (context == null || expression == null) {
        return null;
    }
    StandardEvaluationContext sec = new StandardEvaluationContext(context);
    sec.addPropertyAccessor(new MapAccessor());
    return expression.getValue(sec);
}
 

@Test
public void projection() throws Exception {
  StandardEvaluationContext context = new StandardEvaluationContext();
  context.setTypeLocator(new CommonTypeLocator());
  context.addPropertyAccessor(new MapAccessor());
  context.setVariable("content",
      "{\"blocks\":[{\"data\":{},\"depth\":0,\"entityRanges\":[],\"inlineStyleRanges\":[],\"key\":\"ummxd\",\"text\":\"Test\",\"type\":\"unstyled\"}],\"entityMap\":{}}");
  String value = parser
      .parseExpression("T(SyncUtil).fromJson(#content,T(Map))['blocks'].![text]")
      .getValue(context, String.class);
  Assert.assertEquals(value, "Test");
}
 

private EvaluationContext createEvaluationContext(PageContext pageContext) {
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.addPropertyAccessor(new JspPropertyAccessor(pageContext));
	context.addPropertyAccessor(new MapAccessor());
	context.addPropertyAccessor(new EnvironmentAccessor());
	context.setBeanResolver(new BeanFactoryResolver(getRequestContext().getWebApplicationContext()));
	ConversionService conversionService = getConversionService(pageContext);
	if (conversionService != null) {
		context.setTypeConverter(new StandardTypeConverter(conversionService));
	}
	return context;
}
 

private EvaluationContext createEvaluationContext(PageContext pageContext) {
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.addPropertyAccessor(new JspPropertyAccessor(pageContext));
	context.addPropertyAccessor(new MapAccessor());
	context.addPropertyAccessor(new EnvironmentAccessor());
	context.setBeanResolver(new BeanFactoryResolver(getRequestContext().getWebApplicationContext()));
	ConversionService conversionService = getConversionService(pageContext);
	if (conversionService != null) {
		context.setTypeConverter(new StandardTypeConverter(conversionService));
	}
	return context;
}
 

@Override
public MailMessage create(MailTemplate mailTemplate, MailSource source) {
    MailMessageImpl.Builder b = MailMessageImpl.builder();
    final StandardEvaluationContext ctx = new StandardEvaluationContext(source.getVariables());
    ctx.addPropertyAccessor(new MapAccessor());
    UnaryOperator<Object> processor = (o) -> MailTemplateUtils.process((s) -> evaluate(ctx, s), o);
    b.setHead(MailHeadImpl.builder().from(mailTemplate.getHeadSource(), processor).build());
    MailPartTemplate bs = mailTemplate.getBodySource();
    String bodyText = (String) evaluate(ctx, bs.getData());
    b.setBody(new MailTextBody(bodyText, bs.getMime()));
    return b.build();
}
 

@Nullable
protected String getDescription(InstanceEvent event, Instance instance) {
	Map<String, Object> root = new HashMap<>();
	root.put("event", event);
	root.put("instance", instance);
	root.put("lastStatus", getLastStatus(event.getInstance()));
	StandardEvaluationContext context = new StandardEvaluationContext(root);
	context.addPropertyAccessor(new MapAccessor());

	return description.getValue(context, String.class);
}
 

@Nullable
protected String getText(InstanceEvent event, Instance instance) {
	Map<String, Object> root = new HashMap<>();
	root.put("event", event);
	root.put("instance", instance);
	root.put("lastStatus", getLastStatus(event.getInstance()));
	StandardEvaluationContext context = new StandardEvaluationContext(root);
	context.addPropertyAccessor(new MapAccessor());
	return message.getValue(context, String.class);
}
 

@Nullable
protected String getMessage(InstanceEvent event, Instance instance) {
	Map<String, Object> root = new HashMap<>();
	root.put("event", event);
	root.put("instance", instance);
	root.put("lastStatus", getLastStatus(event.getInstance()));
	StandardEvaluationContext context = new StandardEvaluationContext(root);
	context.addPropertyAccessor(new MapAccessor());
	return description.getValue(context, String.class);
}
 

@Nullable
protected String getText(InstanceEvent event, Instance instance) {
	Map<String, Object> root = new HashMap<>();
	root.put("event", event);
	root.put("instance", instance);
	root.put("lastStatus", getLastStatus(event.getInstance()));
	StandardEvaluationContext context = new StandardEvaluationContext(root);
	context.addPropertyAccessor(new MapAccessor());
	return message.getValue(context, String.class);
}
 

@Nullable
protected String getText(InstanceEvent event, Instance instance) {
	Map<String, Object> root = new HashMap<>();
	root.put("event", event);
	root.put("instance", instance);
	root.put("lastStatus", getLastStatus(event.getInstance()));
	StandardEvaluationContext context = new StandardEvaluationContext(root);
	context.addPropertyAccessor(new MapAccessor());
	return message.getValue(context, String.class);
}
 

@Nullable
protected String createContent(InstanceEvent event, Instance instance) {
	Map<String, Object> root = new HashMap<>();
	root.put("event", event);
	root.put("instance", instance);
	root.put("lastStatus", getLastStatus(event.getInstance()));
	StandardEvaluationContext context = new StandardEvaluationContext(root);
	context.addPropertyAccessor(new MapAccessor());
	return message.getValue(context, String.class);
}
 

@Nullable
protected String getMessage(InstanceEvent event, Instance instance) {
	Map<String, Object> root = new HashMap<>();
	root.put("event", event);
	root.put("instance", instance);
	root.put("lastStatus", getLastStatus(event.getInstance()));
	StandardEvaluationContext context = new StandardEvaluationContext(root);
	context.addPropertyAccessor(new MapAccessor());
	return description.getValue(context, String.class);
}
 

public RoutingFunction(FunctionCatalog functionCatalog, FunctionInspector functionInspector, FunctionProperties functionProperties) {
	this.functionCatalog = functionCatalog;
	this.functionProperties = functionProperties;
	this.functionInspector = functionInspector;
	this.evalContext.addPropertyAccessor(new MapAccessor());
}
 

/**
 * Creates a new instance with {@link StandardEvaluationContext} including
 * {@link org.springframework.expression.spel.support.ReflectivePropertyAccessor ReflectivePropertyAccessor}
 * and {@link MapAccessor}.
 */
public SpelMessageInterpolator() {
    StandardEvaluationContext ctx = new StandardEvaluationContext();
    ctx.addPropertyAccessor(new MapAccessor());
    this.evalContext = ctx;
}