程序包 cn.taketoday.web.bind.resolver

类 ExpressionValueMethodArgumentResolver

java.lang.Object

cn.taketoday.web.bind.resolver.AbstractNamedValueResolvingStrategy

cn.taketoday.web.bind.resolver.ExpressionValueMethodArgumentResolver

所有已实现的接口:

ParameterResolvingStrategy

public class ExpressionValueMethodArgumentResolver
extends AbstractNamedValueResolvingStrategy

Resolves method arguments annotated with @Value.

An @Value does not have a name but gets resolved from the default value string, which may contain ${...} placeholder or Spring Expression Language #{...} expressions.

A WebDataBinder may be invoked to apply type conversion to resolved argument value.

从以下版本开始:

4.0 2022/4/27 13:37

作者:

Rossen Stoyanchev, Harry Yang

构造器概要

构造器

构造器	说明
ExpressionValueMethodArgumentResolver(cn.taketoday.beans.factory.config.ConfigurableBeanFactory beanFactory)	Create a new ExpressionValueMethodArgumentResolver instance.

方法概要

修饰符和类型	方法	说明
protected NamedValueInfo	getNamedValueInfo(ResolvableMethodParameter resolvable)
protected void	handleMissingValue(String name, cn.taketoday.core.MethodParameter parameter)	Invoked when a named value is required, but AbstractNamedValueResolvingStrategy.resolveName(String, ResolvableMethodParameter, RequestContext) returned null and there is no default value.
protected Object	resolveName(String name, ResolvableMethodParameter resolvable, RequestContext context)	Resolve the given parameter type and value name into an argument value.
boolean	supportsParameter(ResolvableMethodParameter resolvable)	Whether the given parameter is supported by this resolver.

从类继承的方法 cn.taketoday.web.bind.resolver.AbstractNamedValueResolvingStrategy

handleMissingValue, handleMissingValueAfterConversion, handleResolvedValue, resolveArgument

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

ExpressionValueMethodArgumentResolver

public ExpressionValueMethodArgumentResolver(@Nullable
 cn.taketoday.beans.factory.config.ConfigurableBeanFactory beanFactory)

Create a new ExpressionValueMethodArgumentResolver instance.

参数:

beanFactory - a bean factory to use for resolving ${...} placeholder and #{...} SpEL expressions in default values; or null if default values are not expected to contain expressions

方法详细资料

supportsParameter

public boolean supportsParameter(ResolvableMethodParameter resolvable)

从接口复制的说明: ParameterResolvingStrategy

Whether the given parameter is supported by this resolver.

static match

getNamedValueInfo

protected NamedValueInfo getNamedValueInfo(ResolvableMethodParameter resolvable)

覆盖:

getNamedValueInfo 在类中 AbstractNamedValueResolvingStrategy

resolveName

@Nullable
protected Object resolveName(String name,
 ResolvableMethodParameter resolvable,
 RequestContext context)
                      throws Exception

从类复制的说明: AbstractNamedValueResolvingStrategy

Resolve the given parameter type and value name into an argument value.

指定者:

resolveName 在类中 AbstractNamedValueResolvingStrategy

参数:

name - the name of the value being resolved

resolvable - the method parameter to resolve to an argument value (pre-nested in case of a Optional declaration)

context - the current request context

返回:

the resolved argument (may be null)

抛出:

Exception - in case of errors

handleMissingValue

protected void handleMissingValue(String name,
 cn.taketoday.core.MethodParameter parameter)

从类复制的说明: AbstractNamedValueResolvingStrategy

Invoked when a named value is required, but AbstractNamedValueResolvingStrategy.resolveName(String, ResolvableMethodParameter, RequestContext) returned null and there is no default value. Subclasses typically throw an exception in this case.

覆盖:

handleMissingValue 在类中 AbstractNamedValueResolvingStrategy

参数:

name - the name for the value

parameter - the method parameter