org.springframework.messaging.handler.method

Class HandlerMethodArgumentResolverComposite

java.lang.Object

org.springframework.messaging.handler.method.HandlerMethodArgumentResolverComposite

All Implemented Interfaces:

HandlerMethodArgumentResolver

public class HandlerMethodArgumentResolverComposite
extends java.lang.Object
implements HandlerMethodArgumentResolver

Resolves method parameters by delegating to a list of registered HandlerMethodArgumentResolver. Previously resolved method parameters are cached for faster lookups.

Since:

4.0

Author:

Rossen Stoyanchev

Field Summary

Fields

Modifier and Type	Field and Description
private java.util.Map<MethodParameter,HandlerMethodArgumentResolver>	argumentResolverCache
private java.util.List<HandlerMethodArgumentResolver>	argumentResolvers
protected Log	logger

Constructor Summary

Constructors

Constructor and Description
HandlerMethodArgumentResolverComposite()

Method Summary

Modifier and Type	Method and Description
HandlerMethodArgumentResolverComposite	addResolver(HandlerMethodArgumentResolver argumentResolver) Add the given HandlerMethodArgumentResolver.
HandlerMethodArgumentResolverComposite	addResolvers(java.util.List<? extends HandlerMethodArgumentResolver> argumentResolvers) Add the given HandlerMethodArgumentResolvers.
private HandlerMethodArgumentResolver	getArgumentResolver(MethodParameter parameter) Find a registered HandlerMethodArgumentResolver that supports the given method parameter.
java.util.List<HandlerMethodArgumentResolver>	getResolvers() Return a read-only list with the contained resolvers, or an empty list.
java.lang.Object	resolveArgument(MethodParameter parameter, Message<?> message) Iterate over registered HandlerMethodArgumentResolvers and invoke the one that supports it.
boolean	supportsParameter(MethodParameter parameter) Whether the given method parameter is supported by any registered HandlerMethodArgumentResolver.

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final Log logger

argumentResolvers

private final java.util.List<HandlerMethodArgumentResolver> argumentResolvers

argumentResolverCache

private final java.util.Map<MethodParameter,HandlerMethodArgumentResolver> argumentResolverCache

Constructor Detail

HandlerMethodArgumentResolverComposite

public HandlerMethodArgumentResolverComposite()

Method Detail

getResolvers

public java.util.List<HandlerMethodArgumentResolver> getResolvers()

Return a read-only list with the contained resolvers, or an empty list.

supportsParameter

public boolean supportsParameter(MethodParameter parameter)

Whether the given method parameter is supported by any registered HandlerMethodArgumentResolver.

Specified by:

supportsParameter in interface HandlerMethodArgumentResolver

Parameters:

parameter - the method parameter to check

Returns:

true if this resolver supports the supplied parameter; false otherwise

resolveArgument

public java.lang.Object resolveArgument(MethodParameter parameter,
                               Message<?> message)
                                 throws java.lang.Exception

Iterate over registered HandlerMethodArgumentResolvers and invoke the one that supports it.

Specified by:

resolveArgument in interface HandlerMethodArgumentResolver

Parameters:

parameter - the method parameter to resolve. This parameter must have previously been passed to HandlerMethodArgumentResolver.supportsParameter(org.springframework.core.MethodParameter) and it must have returned true

Returns:

the resolved argument value, or null.

Throws:

java.lang.IllegalStateException - if no suitable HandlerMethodArgumentResolver is found.

java.lang.Exception - in case of errors with the preparation of argument values

getArgumentResolver

private HandlerMethodArgumentResolver getArgumentResolver(MethodParameter parameter)

Find a registered HandlerMethodArgumentResolver that supports the given method parameter.

addResolver

public HandlerMethodArgumentResolverComposite addResolver(HandlerMethodArgumentResolver argumentResolver)

Add the given HandlerMethodArgumentResolver.

addResolvers

public HandlerMethodArgumentResolverComposite addResolvers(java.util.List<? extends HandlerMethodArgumentResolver> argumentResolvers)

Add the given HandlerMethodArgumentResolvers.