Package org.springframework.web.method.support

Class HandlerMethodReturnValueHandlerComposite

java.lang.Object

org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite

All Implemented Interfaces:

HandlerMethodReturnValueHandler

public class HandlerMethodReturnValueHandlerComposite
extends Object
implements HandlerMethodReturnValueHandler

Handles method return values by delegating to a list of registered HandlerMethodReturnValueHandlers. Previously resolved return types are cached for faster lookups.

Since:

3.1

Author:

Rossen Stoyanchev

Constructor Summary

Constructors

Constructor	Description
HandlerMethodReturnValueHandlerComposite()

Method Summary

Modifier and Type	Method	Description
HandlerMethodReturnValueHandlerComposite	addHandler(HandlerMethodReturnValueHandler handler)	Add the given HandlerMethodReturnValueHandler.
HandlerMethodReturnValueHandlerComposite	addHandlers(List<? extends HandlerMethodReturnValueHandler> handlers)	Add the given HandlerMethodReturnValueHandlers.
List<HandlerMethodReturnValueHandler>	getHandlers()	Return a read-only list with the registered handlers, or an empty list.
void	handleReturnValue(Object returnValue, MethodParameter returnType, ModelAndViewContainer mavContainer, NativeWebRequest webRequest)	Iterate over registered HandlerMethodReturnValueHandlers and invoke the one that supports it.
boolean	supportsReturnType(MethodParameter returnType)	Whether the given method return type is supported by any registered HandlerMethodReturnValueHandler.

Methods inherited from class java.lang.Object

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

Constructor Details

HandlerMethodReturnValueHandlerComposite

public HandlerMethodReturnValueHandlerComposite()

Method Details

getHandlers

public List<HandlerMethodReturnValueHandler> getHandlers()

Return a read-only list with the registered handlers, or an empty list.

supportsReturnType

public boolean supportsReturnType(MethodParameter returnType)

Whether the given method return type is supported by any registered HandlerMethodReturnValueHandler.

Specified by:

supportsReturnType in interface HandlerMethodReturnValueHandler

Parameters:

returnType - the method return type to check

Returns:

true if this handler supports the supplied return type; false otherwise

handleReturnValue

public void handleReturnValue(@Nullable
 Object returnValue,
 MethodParameter returnType,
 ModelAndViewContainer mavContainer,
 NativeWebRequest webRequest)
                       throws Exception

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

Specified by:

handleReturnValue in interface HandlerMethodReturnValueHandler

Parameters:

returnValue - the value returned from the handler method

returnType - the type of the return value. This type must have previously been passed to HandlerMethodReturnValueHandler.supportsReturnType(org.springframework.core.MethodParameter) which must have returned true.

mavContainer - the ModelAndViewContainer for the current request

webRequest - the current request

Throws:

IllegalStateException - if no suitable HandlerMethodReturnValueHandler is found.

Exception - if the return value handling results in an error

addHandler

public HandlerMethodReturnValueHandlerComposite addHandler(HandlerMethodReturnValueHandler handler)

Add the given HandlerMethodReturnValueHandler.

addHandlers

public HandlerMethodReturnValueHandlerComposite addHandlers(@Nullable
 List<? extends HandlerMethodReturnValueHandler> handlers)

Add the given HandlerMethodReturnValueHandlers.