org.springframework.web.servlet.handler

Class AbstractHandlerMethodMapping<T>

java.lang.Object

org.springframework.context.support.ApplicationObjectSupport

org.springframework.web.context.support.WebApplicationObjectSupport

org.springframework.web.servlet.handler.AbstractHandlerMapping

org.springframework.web.servlet.handler.AbstractHandlerMethodMapping<T>

Type Parameters:

T - The mapping for a HandlerMethod containing the conditions needed to match the handler method to incoming request.

All Implemented Interfaces:

Aware, InitializingBean, ApplicationContextAware, Ordered, ServletContextAware, HandlerMapping

Direct Known Subclasses:

RequestMappingInfoHandlerMapping

public abstract class AbstractHandlerMethodMapping<T>
extends AbstractHandlerMapping
implements InitializingBean

Abstract base class for HandlerMapping implementations that define a mapping between a request and a HandlerMethod.

For each registered handler method, a unique mapping is maintained with subclasses defining the details of the mapping type <T>.

Since:

3.1

Author:

Arjen Poutsma, Rossen Stoyanchev, Juergen Hoeller

Field Summary

Fields inherited from class org.springframework.context.support.ApplicationObjectSupport

logger

Fields inherited from interface org.springframework.web.servlet.HandlerMapping

BEST_MATCHING_PATTERN_ATTRIBUTE, INTROSPECT_TYPE_LEVEL_MAPPING, MATRIX_VARIABLES_ATTRIBUTE, PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE, PRODUCIBLE_MEDIA_TYPES_ATTRIBUTE, URI_TEMPLATE_VARIABLES_ATTRIBUTE

Fields inherited from interface org.springframework.core.Ordered

HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE

Constructor Summary

Constructors

Constructor and Description
AbstractHandlerMethodMapping()

Method Summary

Modifier and Type	Method and Description
void	afterPropertiesSet() Detects handler methods at initialization.
protected HandlerMethod	createHandlerMethod(Object handler, Method method) Create the HandlerMethod instance.
protected void	detectHandlerMethods(Object handler) Look for handler methods in a handler.
protected HandlerMethod	getHandlerInternal(HttpServletRequest request) Look up a handler method for the given request.
Map<T,HandlerMethod>	getHandlerMethods() Return a map with all handler methods and their mappings.
protected abstract Comparator<T>	getMappingComparator(HttpServletRequest request) Return a comparator for sorting matching mappings.
protected abstract T	getMappingForMethod(Method method, Class<?> handlerType) Provide the mapping for a handler method.
protected abstract Set<String>	getMappingPathPatterns(T mapping) Extract and return the URL paths contained in a mapping.
protected abstract T	getMatchingMapping(T mapping, HttpServletRequest request) Check if a mapping matches the current request and return a (potentially new) mapping with conditions relevant to the current request.
protected void	handleMatch(T mapping, String lookupPath, HttpServletRequest request) Invoked when a matching mapping is found.
protected HandlerMethod	handleNoMatch(Set<T> mappings, String lookupPath, HttpServletRequest request) Invoked when no matching mapping is not found.
protected void	handlerMethodsInitialized(Map<T,HandlerMethod> handlerMethods) Invoked after all handler methods have been detected.
protected void	initHandlerMethods() Scan beans in the ApplicationContext, detect and register handler methods.
protected abstract boolean	isHandler(Class<?> beanType) Whether the given type is a handler with handler methods.
protected HandlerMethod	lookupHandlerMethod(String lookupPath, HttpServletRequest request) Look up the best-matching handler method for the current request.
protected void	registerHandlerMethod(Object handler, Method method, T mapping) Register a handler method and its unique mapping.
void	setDetectHandlerMethodsInAncestorContexts(boolean detectHandlerMethodsInAncestorContexts) Whether to detect handler methods in beans in ancestor ApplicationContexts.

Methods inherited from class org.springframework.web.servlet.handler.AbstractHandlerMapping

adaptInterceptor, detectMappedInterceptors, extendInterceptors, getAdaptedInterceptors, getDefaultHandler, getHandler, getHandlerExecutionChain, getMappedInterceptors, getOrder, getPathMatcher, getUrlPathHelper, initApplicationContext, initInterceptors, setAlwaysUseFullPath, setDefaultHandler, setInterceptors, setOrder, setPathMatcher, setRemoveSemicolonContent, setUrlDecode, setUrlPathHelper

Methods inherited from class org.springframework.web.context.support.WebApplicationObjectSupport

getServletContext, getTempDir, getWebApplicationContext, initApplicationContext, initServletContext, isContextRequired, setServletContext

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport

getApplicationContext, getMessageSourceAccessor, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractHandlerMethodMapping

public AbstractHandlerMethodMapping()

Method Detail

setDetectHandlerMethodsInAncestorContexts

public void setDetectHandlerMethodsInAncestorContexts(boolean detectHandlerMethodsInAncestorContexts)

Whether to detect handler methods in beans in ancestor ApplicationContexts.

Default is "false": Only beans in the current ApplicationContext are considered, i.e. only in the context that this HandlerMapping itself is defined in (typically the current DispatcherServlet's context).

Switch this flag on to detect handler beans in ancestor contexts (typically the Spring root WebApplicationContext) as well.

getHandlerMethods

public Map<T,HandlerMethod> getHandlerMethods()

Return a map with all handler methods and their mappings.

afterPropertiesSet

public void afterPropertiesSet()

Detects handler methods at initialization.

Specified by:

afterPropertiesSet in interface InitializingBean

initHandlerMethods

protected void initHandlerMethods()

Scan beans in the ApplicationContext, detect and register handler methods.

See Also:

isHandler(Class), getMappingForMethod(Method, Class), handlerMethodsInitialized(Map)

isHandler

protected abstract boolean isHandler(Class<?> beanType)

Whether the given type is a handler with handler methods.

Parameters:

beanType - the type of the bean being checked

Returns:

"true" if this a handler type, "false" otherwise.

detectHandlerMethods

protected void detectHandlerMethods(Object handler)

Look for handler methods in a handler.

Parameters:

handler - the bean name of a handler or a handler instance

getMappingForMethod

protected abstract T getMappingForMethod(Method method,
                                         Class<?> handlerType)

Provide the mapping for a handler method. A method for which no mapping can be provided is not a handler method.

Parameters:

method - the method to provide a mapping for

handlerType - the handler type, possibly a sub-type of the method's declaring class

Returns:

the mapping, or null if the method is not mapped

registerHandlerMethod

protected void registerHandlerMethod(Object handler,
                                     Method method,
                                     T mapping)

Register a handler method and its unique mapping.

Parameters:

handler - the bean name of the handler or the handler instance

method - the method to register

mapping - the mapping conditions associated with the handler method

Throws:

IllegalStateException - if another method was already registered under the same mapping

createHandlerMethod

protected HandlerMethod createHandlerMethod(Object handler,
                                            Method method)

Create the HandlerMethod instance.

Parameters:

handler - either a bean name or an actual handler instance

method - the target method

Returns:

the created HandlerMethod

getMappingPathPatterns

protected abstract Set<String> getMappingPathPatterns(T mapping)

Extract and return the URL paths contained in a mapping.

handlerMethodsInitialized

protected void handlerMethodsInitialized(Map<T,HandlerMethod> handlerMethods)

Invoked after all handler methods have been detected.

Parameters:

handlerMethods - a read-only map with handler methods and mappings.

getHandlerInternal

protected HandlerMethod getHandlerInternal(HttpServletRequest request)
                                    throws Exception

Look up a handler method for the given request.

Specified by:

getHandlerInternal in class AbstractHandlerMapping

Parameters:

request - current HTTP request

Returns:

the corresponding handler instance, or null if none found

Throws:

Exception - if there is an internal error

lookupHandlerMethod

protected HandlerMethod lookupHandlerMethod(String lookupPath,
                                            HttpServletRequest request)
                                     throws Exception

Look up the best-matching handler method for the current request. If multiple matches are found, the best match is selected.

Parameters:

lookupPath - mapping lookup path within the current servlet mapping

request - the current request

Returns:

the best-matching handler method, or null if no match

Throws:

Exception

See Also:

handleMatch(Object, String, HttpServletRequest), handleNoMatch(Set, String, HttpServletRequest)

getMatchingMapping

protected abstract T getMatchingMapping(T mapping,
                                        HttpServletRequest request)

Check if a mapping matches the current request and return a (potentially new) mapping with conditions relevant to the current request.

Parameters:

mapping - the mapping to get a match for

request - the current HTTP servlet request

Returns:

the match, or null if the mapping doesn't match

getMappingComparator

protected abstract Comparator<T> getMappingComparator(HttpServletRequest request)

Return a comparator for sorting matching mappings. The returned comparator should sort 'better' matches higher.

Parameters:

request - the current request

Returns:

the comparator, never null

handleMatch

protected void handleMatch(T mapping,
                           String lookupPath,
                           HttpServletRequest request)

Invoked when a matching mapping is found.

Parameters:

mapping - the matching mapping

lookupPath - mapping lookup path within the current servlet mapping

request - the current request

handleNoMatch

protected HandlerMethod handleNoMatch(Set<T> mappings,
                                      String lookupPath,
                                      HttpServletRequest request)
                               throws Exception

Invoked when no matching mapping is not found.

Parameters:

mappings - all registered mappings

lookupPath - mapping lookup path within the current servlet mapping

request - the current request

Throws:

ServletException - in case of errors

Exception