Package org.springframework.web.reactive.result.method.annotation

Class RequestParamMethodArgumentResolver

java.lang.Object

org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport

org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver

org.springframework.web.reactive.result.method.annotation.AbstractNamedValueSyncArgumentResolver

org.springframework.web.reactive.result.method.annotation.RequestParamMethodArgumentResolver

All Implemented Interfaces:

HandlerMethodArgumentResolver, SyncHandlerMethodArgumentResolver

public class RequestParamMethodArgumentResolver
extends AbstractNamedValueSyncArgumentResolver

Resolver for method arguments annotated with @RequestParam from URI query string parameters.

This resolver can also be created in default resolution mode in which simple types (int, long, etc.) not annotated with @RequestParam are also treated as request parameters with the parameter name derived from the argument name.

If the method parameter type is Map, the name specified in the annotation is used to resolve the request parameter String value. The value is then converted to a Map via type conversion assuming a suitable Converter has been registered. Or if a request parameter name is not specified the RequestParamMapMethodArgumentResolver is used instead to provide access to all request parameters in the form of a map.

Since:

5.0

Author:

Rossen Stoyanchev

See Also:

• RequestParamMapMethodArgumentResolver

Nested Class Summary

Nested classes/interfaces inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver

AbstractNamedValueArgumentResolver.NamedValueInfo

Field Summary

Fields inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport

logger

Constructor Summary

Constructors

Constructor	Description
RequestParamMethodArgumentResolver(ConfigurableBeanFactory factory, ReactiveAdapterRegistry registry, boolean useDefaultResolution)	Class constructor with a default resolution mode flag.

Method Summary

Modifier and Type	Method	Description
protected AbstractNamedValueArgumentResolver.NamedValueInfo	createNamedValueInfo(MethodParameter parameter)	Create the AbstractNamedValueArgumentResolver.NamedValueInfo object for the given method parameter.
protected void	handleMissingValue(String name, MethodParameter parameter, ServerWebExchange exchange)	Invoked when a named value is required, but AbstractNamedValueArgumentResolver.resolveName(String, MethodParameter, ServerWebExchange) returned null and there is no default value.
protected Object	resolveNamedValue(String name, MethodParameter parameter, ServerWebExchange exchange)	Actually resolve the value synchronously.
boolean	supportsParameter(MethodParameter param)	Whether this resolver supports the given method parameter.

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueSyncArgumentResolver

resolveArgument, resolveArgumentValue, resolveName

Methods inherited from class org.springframework.web.reactive.result.method.annotation.AbstractNamedValueArgumentResolver

handleMissingValue, handleResolvedValue

Methods inherited from class org.springframework.web.reactive.result.method.HandlerMethodArgumentResolverSupport

checkAnnotatedParamNoReactiveWrapper, checkParameterType, checkParameterTypeNoReactiveWrapper, getAdapterRegistry

Methods inherited from class java.lang.Object

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

Constructor Details

RequestParamMethodArgumentResolver

public RequestParamMethodArgumentResolver(@Nullable
 ConfigurableBeanFactory factory,
 ReactiveAdapterRegistry registry,
 boolean useDefaultResolution)

Class constructor with a default resolution mode flag.

Parameters:

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

registry - for checking reactive type wrappers

useDefaultResolution - in default resolution mode a method argument that is a simple type, as defined in BeanUtils.isSimpleProperty(java.lang.Class<?>), is treated as a request parameter even if it isn't annotated, the request parameter name is derived from the method parameter name.

Method Details

supportsParameter

public boolean supportsParameter(MethodParameter param)

Description copied from interface: HandlerMethodArgumentResolver

Whether this resolver supports the given method parameter.

Parameters:

param - the method parameter

createNamedValueInfo

protected AbstractNamedValueArgumentResolver.NamedValueInfo createNamedValueInfo(MethodParameter parameter)

Description copied from class: AbstractNamedValueArgumentResolver

Create the AbstractNamedValueArgumentResolver.NamedValueInfo object for the given method parameter. Implementations typically retrieve the method annotation by means of MethodParameter.getParameterAnnotation(Class).

Specified by:

createNamedValueInfo in class AbstractNamedValueArgumentResolver

Parameters:

parameter - the method parameter

Returns:

the named value information

resolveNamedValue

protected Object resolveNamedValue(String name,
 MethodParameter parameter,
 ServerWebExchange exchange)

Description copied from class: AbstractNamedValueSyncArgumentResolver

Actually resolve the value synchronously.

Specified by:

resolveNamedValue in class AbstractNamedValueSyncArgumentResolver

handleMissingValue

protected void handleMissingValue(String name,
 MethodParameter parameter,
 ServerWebExchange exchange)

Description copied from class: AbstractNamedValueArgumentResolver

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

Overrides:

handleMissingValue in class AbstractNamedValueArgumentResolver

Parameters:

name - the name for the value

parameter - the method parameter

exchange - the current exchange