Java Code Examples for org.springframework.expression.spel.support.StandardEvaluationContext#setBeanResolver()

static Object getValue(SpelExpressionParser parser, BeanFactory beanFactory,
		String entryValue) {
	Object value;
	String rawValue = entryValue;
	if (rawValue != null) {
		rawValue = rawValue.trim();
	}
	if (rawValue != null && rawValue.startsWith("#{") && entryValue.endsWith("}")) {
		// assume it's spel
		StandardEvaluationContext context = new StandardEvaluationContext();
		context.setBeanResolver(new BeanFactoryResolver(beanFactory));
		Expression expression = parser.parseExpression(entryValue,
				new TemplateParserContext());
		value = expression.getValue(context);
	}
	else {
		value = entryValue;
	}
	return value;
}
 

public static Validator testValidator(VerifierMode verifierMode) {
    TestModel.setFit(true);

    Map<String, Object> registeredObjects = singletonMap("env", System.getProperties());

    Supplier<EvaluationContext> spelContextFactory = () -> {
        StandardEvaluationContext context = new StandardEvaluationContext();
        context.registerFunction("fit", TestModel.getFitMethod());
        context.setBeanResolver((ctx, beanName) -> registeredObjects.get(beanName));
        return context;
    };

    return Validation.buildDefaultValidatorFactory()
            .usingContext()
            .constraintValidatorFactory(new ConstraintValidatorFactoryWrapper(verifierMode, type -> Optional.empty(), spelContextFactory))
            .messageInterpolator(new SpELMessageInterpolator(spelContextFactory))
            .getValidator();
}
 

/**
 * Creates the key filter lambda which is responsible to decide how the rate limit will be performed. The key
 * is the unique identifier like an IP address or a username.
 * 
 * @param url is used to generated a unique cache key
 * @param rateLimit the {@link RateLimit} configuration which holds the skip condition string
 * @param expressionParser is used to evaluate the expression if the filter key type is EXPRESSION.
 * @param beanFactory used to get full access to all java beans in the SpEl
 * @return should not been null. If no filter key type is matching a plain 1 is returned so that all requests uses the same key.
 */
public KeyFilter<R> getKeyFilter(String url, RateLimit rateLimit, ExpressionParser expressionParser, BeanFactory beanFactory) {
	
	String expression = rateLimit.getExpression();
	if(StringUtils.isEmpty(expression)) {
		throw new MissingKeyFilterExpressionException();
	}
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.setBeanResolver(new BeanFactoryResolver(beanFactory));
	return  (request) -> {
		//TODO performance problem - how can the request object reused in the expression without setting it as a rootObject
		Expression expr = expressionParser.parseExpression(rateLimit.getExpression()); 
		final String value = expr.getValue(context, request, String.class);
		return url + "-" + value;
	};

	
}
 

/**
 * 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 QueryMethodEvaluationContextProvider delegateContextProvider(
		QueryMethodEvaluationContextProvider evaluationContextProvider) {
	return new QueryMethodEvaluationContextProvider() {
		@Override
		public <T extends Parameters<?, ?>> EvaluationContext getEvaluationContext(
				T parameters, Object[] parameterValues) {
			StandardEvaluationContext evaluationContext = (StandardEvaluationContext)
					evaluationContextProvider
					.getEvaluationContext(parameters, parameterValues);
			evaluationContext.setRootObject(
					DatastoreRepositoryFactory.this.applicationContext);
			evaluationContext.addPropertyAccessor(new BeanFactoryAccessor());
			evaluationContext.setBeanResolver(new BeanFactoryResolver(
					DatastoreRepositoryFactory.this.applicationContext));
			return evaluationContext;
		}
	};
}
 

private static Object getValue(SpelExpressionParser parser, BeanFactory beanFactory,
                               String entryValue) {
    Object value;
    String rawValue = entryValue;
    if (rawValue != null) {
        rawValue = rawValue.trim();
    }
    if (rawValue != null && rawValue.startsWith("#{") && entryValue.endsWith("}")) {
        // assume it's spel
        StandardEvaluationContext context = new StandardEvaluationContext();
        context.setBeanResolver(new BeanFactoryResolver(beanFactory));
        Expression expression = parser.parseExpression(entryValue,
                new TemplateParserContext());
        context.lookupVariable("api");
        value = expression.getValue(context);
    } else {
        value = entryValue;
    }
    return value;
}
 

@Test
public void SPR11445_beanReference() {
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.setBeanResolver(new Spr11445Class());
	Expression expr = new SpelExpressionParser().parseRaw("@bean.echo(@bean.parameter())");
	assertEquals(1, expr.getValue(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;
}
 

private boolean isVisible(String visible) {
    if (StringUtils.isNotEmpty(visible)) {
        ExpressionParser parser = new SpelExpressionParser();
        StandardEvaluationContext context = new StandardEvaluationContext();
        context.setBeanResolver(new ApplicationContextBeanResolver());
        return parser.parseExpression(visible).getValue(context, Boolean.class);
    }
    return true;
}
 

/**
 * 设置 request/response 参数的上下文
 *
 * @param secureExpressionHandler 上下文处理器
 * @param request                 请求
 * @param response                响应
 * @return 上下文
 */
public static StandardEvaluationContext getEvaluationContext(SecureExpressionHandler secureExpressionHandler, HttpServletRequest request, HttpServletResponse response) {
	// 初始化Sp el表达式上下文，并设置 处理函数
	StandardEvaluationContext context = new StandardEvaluationContext(secureExpressionHandler);
	// 设置表达式支持spring bean
	context.setBeanResolver(new BeanFactoryResolver(SpringUtil.getContext()));
	context.setVariable(SecureConstants.REQUEST, request);
	context.setVariable(SecureConstants.RESPONSE, response);
	return context;
}
 

/**
 * 包含方法上的参数的上下文
 *
 * @param secureExpressionHandler 上下文处理器
 * @param method                  方法
 * @param args                    参数
 * @return 上下文
 */
public static StandardEvaluationContext getEvaluationContext(SecureExpressionHandler secureExpressionHandler, Method method, Object[] args) {
	// 初始化Spel表达式上下文，并设置 处理函数
	StandardEvaluationContext context = new StandardEvaluationContext(secureExpressionHandler);
	// 设置表达式支持spring bean
	context.setBeanResolver(new BeanFactoryResolver(SpringUtil.getContext()));
	for (int i = 0; i < args.length; i++) {
		// 读取方法参数
		MethodParameter methodParam = ClassUtil.getMethodParameter(method, i);
		// 设置方法 参数名和值 为sp el变量
		context.setVariable(methodParam.getParameterName(), args[i]);
	}
	return context;
}
 

@Test
public void evaluateWithArgumentAndBeanReferencing() {
    // given
    StandardEvaluationContext evaluationContext = new StandardEvaluationContext();
    evaluationContext.setBeanResolver(new BeanFactoryResolver(applicationContext));
    ExpressionEvaluator expressionEvaluator = new ExpressionEvaluator(expressionParser, evaluationContext);

    String string = "@string.toString()";
    Argument argument = new Argument();
    // when
    Object result = expressionEvaluator.evaluate(string, argument);
    // then
    assertThat(result, is("bean string"));
}
 

public static void main(String[] args) {
    ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext();
    ctx.refresh();
    ExpressionParser parser = new SpelExpressionParser();
    StandardEvaluationContext context = new StandardEvaluationContext();
    context.setBeanResolver(new BeanFactoryResolver(ctx));
    Properties result = parser.parseExpression("@systemProperties").getValue(context, Properties.class);
    Assert.assertEquals(System.getProperties(), result);
}
 

@Test
public void SPR11445_beanReference() {
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.setBeanResolver(new Spr11445Class());
	Expression expr = new SpelExpressionParser().parseRaw("@bean.echo(@bean.parameter())");
	assertEquals(1, expr.getValue(context));
}
 

/**
 * Creates the lambda for the skip condition which will be evaluated on each request
 * 
 * @param rateLimit the {@link RateLimit} configuration which holds the skip condition string
 * @param expressionParser is used to evaluate the skip expression
 * @param beanFactory used to get full access to all java beans in the SpEl
 * @return the lamdba condition which will be evaluated lazy - null if there is no condition available.
 */
public Condition<R> skipCondition(RateLimit rateLimit, ExpressionParser expressionParser, BeanFactory beanFactory) {
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.setBeanResolver(new BeanFactoryResolver(beanFactory));
	
	if(rateLimit.getSkipCondition() != null) {
		return  (request) -> {
			Expression expr = expressionParser.parseExpression(rateLimit.getSkipCondition()); 
			Boolean value = expr.getValue(context, request, Boolean.class);
			return value;
		};
	}
	return null;
}
 

/**
 * Creates the lambda for the execute condition which will be evaluated on each request.
 * 
 * @param rateLimit the {@link RateLimit} configuration which holds the execute condition string
 * @param expressionParser is used to evaluate the execution expression
 * @param beanFactory used to get full access to all java beans in the SpEl
 * @return the lamdba condition which will be evaluated lazy - null if there is no condition available.
 */
public Condition<R> executeCondition(RateLimit rateLimit, ExpressionParser expressionParser, BeanFactory beanFactory) {
	StandardEvaluationContext context = new StandardEvaluationContext();
	context.setBeanResolver(new BeanFactoryResolver(beanFactory));
	
	if(rateLimit.getExecuteCondition() != null) {
		return (request) -> {
			Expression expr = expressionParser.parseExpression(rateLimit.getExecuteCondition()); 
			Boolean value = expr.getValue(context, request, Boolean.class);
			return value;
		};
	}
	return null;
}
 

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;
}
 

public DefaultEntitySanitizer(VerifierMode verifierMode,
                              List<Function<Object, Optional<Object>>> sanitizers,
                              boolean annotationSanitizersEnabled,
                              boolean stdValueSanitizersEnabled,
                              Function<Class<?>, Boolean> includesPredicate,
                              Function<String, Optional<Object>> templateResolver,
                              Map<String, Method> registeredFunctions,
                              Map<String, Object> registeredBeans,
                              Function<Class<?>, Optional<ConstraintValidator<?, ?>>> applicationValidatorFactory) {

    Supplier<EvaluationContext> spelContextFactory = () -> {
        StandardEvaluationContext context = new StandardEvaluationContext();
        registeredFunctions.forEach(context::registerFunction);
        context.setBeanResolver((ctx, beanName) -> registeredBeans.get(beanName));
        context.setMethodResolvers(Collections.singletonList(new ReflectiveMethodResolver()));
        return context;
    };

    this.validator = Validation.buildDefaultValidatorFactory()
            .usingContext()
            .constraintValidatorFactory(new ConstraintValidatorFactoryWrapper(verifierMode, applicationValidatorFactory, spelContextFactory))
            .messageInterpolator(new SpELMessageInterpolator(spelContextFactory))
            .getValidator();

    List<Function<Object, Optional<Object>>> allSanitizers = new ArrayList<>();
    if (annotationSanitizersEnabled) {
        allSanitizers.add(new AnnotationBasedSanitizer(spelContextFactory.get(), includesPredicate));
    }
    if (stdValueSanitizersEnabled) {
        allSanitizers.add(new StdValueSanitizer(includesPredicate));
    }
    allSanitizers.add(new TemplateSanitizer(templateResolver, includesPredicate));
    allSanitizers.addAll(sanitizers);
    this.sanitizers = allSanitizers;
}
 

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;
}