org.springframework.web.servlet.handler

Class AbstractUrlHandlerMapping

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.AbstractUrlHandlerMapping

All Implemented Interfaces:

Aware, BeanNameAware, ApplicationContextAware, Ordered, ServletContextAware, MatchableHandlerMapping, HandlerMapping

Direct Known Subclasses:

AbstractDetectingUrlHandlerMapping, SimpleUrlHandlerMapping

public abstract class AbstractUrlHandlerMapping
extends AbstractHandlerMapping
implements MatchableHandlerMapping

Abstract base class for URL-mapped HandlerMapping implementations.

Supports literal matches and pattern matches such as "/test/*", "/test/**", and others. For details on pattern syntax refer to PathPattern when parsed patterns are enabled or see AntPathMatcher otherwise. The syntax is largely the same but the PathPattern syntax is more tailored for web applications, and its implementation is more efficient.

All path patterns are checked in order to find the most exact match for the current request path where the "most exact" is the longest path pattern that matches the current request path.

Since:

16.04.2003

Author:

Juergen Hoeller, Arjen Poutsma

Field Summary

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

logger

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

BEST_MATCHING_HANDLER_ATTRIBUTE, BEST_MATCHING_PATTERN_ATTRIBUTE, INTROSPECT_TYPE_LEVEL_MAPPING, LOOKUP_PATH, 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
AbstractUrlHandlerMapping()

Method Summary

Modifier and Type	Method and Description
protected Object	buildPathExposingHandler(Object rawHandler, String bestMatchingPattern, String pathWithinMapping, Map<String,String> uriTemplateVariables) Build a handler object for the given raw handler, exposing the actual handler, the HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE, as well as the HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE before executing the handler.
protected void	exposePathWithinMapping(String bestMatchingPattern, String pathWithinMapping, HttpServletRequest request) Expose the path within the current mapping as request attribute.
protected void	exposeUriTemplateVariables(Map<String,String> uriTemplateVariables, HttpServletRequest request) Expose the URI templates variables as request attribute.
protected Object	getHandlerInternal(HttpServletRequest request) Look up a handler for the URL path of the given request.
Map<String,Object>	getHandlerMap() Return the handler mappings as a read-only Map, with the registered path or pattern as key and the handler object (or handler bean name in case of a lazy-init handler), as value.
Map<PathPattern,Object>	getPathPatternHandlerMap() Identical to getHandlerMap() but populated when parsed patterns are enabled; otherwise empty.
Object	getRootHandler() Return the root handler for this handler mapping (registered for "/"), or null if none.
protected Object	lookupHandler(RequestPath path, String lookupPath, HttpServletRequest request) Look up a handler instance for the given URL path.
protected Object	lookupHandler(String lookupPath, HttpServletRequest request) Look up a handler instance for the given URL path.
RequestMatchResult	match(HttpServletRequest request, String pattern) Determine whether the request matches the given pattern.
protected void	registerHandler(String[] urlPaths, String beanName) Register the specified handler for the given URL paths.
protected void	registerHandler(String urlPath, Object handler) Register the specified handler for the given URL path.
void	setLazyInitHandlers(boolean lazyInitHandlers) Set whether to lazily initialize handlers.
void	setPatternParser(PathPatternParser patternParser) Enable use of pre-parsed PathPatterns as an alternative to String pattern matching with AntPathMatcher.
void	setRootHandler(Object rootHandler) Set the root handler for this handler mapping, that is, the handler to be registered for the root path ("/").
void	setUseTrailingSlashMatch(boolean useTrailingSlashMatch) Whether to match to URLs irrespective of the presence of a trailing slash.
protected boolean	supportsTypeLevelMappings() Indicates whether this handler mapping support type-level mappings.
boolean	useTrailingSlashMatch() Whether to match to URLs irrespective of the presence of a trailing slash.
protected void	validateHandler(Object handler, HttpServletRequest request) Validate the given handler against the current request.

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

adaptInterceptor, detectMappedInterceptors, extendInterceptors, formatMappingName, getAdaptedInterceptors, getCorsConfiguration, getCorsConfigurationSource, getCorsHandlerExecutionChain, getCorsProcessor, getDefaultHandler, getHandler, getHandlerExecutionChain, getMappedInterceptors, getOrder, getPathMatcher, getPatternParser, getUrlPathHelper, hasCorsConfigurationSource, initApplicationContext, initInterceptors, initLookupPath, setAlwaysUseFullPath, setBeanName, setCorsConfigurations, setCorsConfigurationSource, setCorsProcessor, setDefaultHandler, setInterceptors, setOrder, setPathMatcher, setRemoveSemicolonContent, setUrlDecode, setUrlPathHelper, usesPathPatterns

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, obtainApplicationContext, requiredContextClass, setApplicationContext

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.springframework.web.servlet.handler.MatchableHandlerMapping

getPatternParser

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

getHandler, usesPathPatterns

Constructor Detail

AbstractUrlHandlerMapping

public AbstractUrlHandlerMapping()

Method Detail

setPatternParser

public void setPatternParser(PathPatternParser patternParser)

Description copied from class: AbstractHandlerMapping

Enable use of pre-parsed PathPatterns as an alternative to String pattern matching with AntPathMatcher. The syntax is largely the same but the PathPattern syntax is more tailored for web applications, and its implementation is more efficient.

This property is mutually exclusive with the following others which are effectively ignored when this is set:

• AbstractHandlerMapping.setAlwaysUseFullPath(boolean) -- PathPatterns always use the full path and ignore the servletPath/pathInfo which are decoded and partially normalized and therefore not comparable against the requestURI.
• AbstractHandlerMapping.setRemoveSemicolonContent(boolean) -- PathPatterns always ignore semicolon content for path matching purposes, but path parameters remain available for use in controllers via @MatrixVariable.
• AbstractHandlerMapping.setUrlDecode(boolean) -- PathPatterns match one decoded path segment at a time and never need the full decoded path which can cause issues due to decoded reserved characters.
• AbstractHandlerMapping.setUrlPathHelper(org.springframework.web.util.UrlPathHelper) -- the request path is pre-parsed globally by the DispatcherServlet or by ServletRequestPathFilter using ServletRequestPathUtils and saved in a request attribute for re-use.
• AbstractHandlerMapping.setPathMatcher(org.springframework.util.PathMatcher) -- patterns are parsed to PathPatterns and used instead of String matching with PathMatcher.

By default this is not set.

Overrides:

setPatternParser in class AbstractHandlerMapping

Parameters:

patternParser - the parser to use

setRootHandler

public void setRootHandler(@Nullable
                           Object rootHandler)

Set the root handler for this handler mapping, that is, the handler to be registered for the root path ("/").

Default is null, indicating no root handler.

getRootHandler

@Nullable
public Object getRootHandler()

Return the root handler for this handler mapping (registered for "/"), or null if none.

setUseTrailingSlashMatch

public void setUseTrailingSlashMatch(boolean useTrailingSlashMatch)

Whether to match to URLs irrespective of the presence of a trailing slash. If enabled a URL pattern such as "/users" also matches to "/users/".

The default value is false.

useTrailingSlashMatch

public boolean useTrailingSlashMatch()

Whether to match to URLs irrespective of the presence of a trailing slash.

setLazyInitHandlers

public void setLazyInitHandlers(boolean lazyInitHandlers)

Set whether to lazily initialize handlers. Only applicable to singleton handlers, as prototypes are always lazily initialized. Default is "false", as eager initialization allows for more efficiency through referencing the controller objects directly.

If you want to allow your controllers to be lazily initialized, make them "lazy-init" and set this flag to true. Just making them "lazy-init" will not work, as they are initialized through the references from the handler mapping in this case.

getHandlerInternal

@Nullable
protected Object getHandlerInternal(HttpServletRequest request)
                                       throws Exception

Look up a handler for the URL path of the given request.

Specified by:

getHandlerInternal in class AbstractHandlerMapping

Parameters:

request - current HTTP request

Returns:

the handler instance, or null if none found

Throws:

Exception - if there is an internal error

lookupHandler

@Nullable
protected Object lookupHandler(RequestPath path,
                                         String lookupPath,
                                         HttpServletRequest request)
                                  throws Exception

Look up a handler instance for the given URL path. This method is used when parsed PathPatterns are enabled.

Parameters:

path - the parsed RequestPath

lookupPath - the String lookupPath for checking direct hits

request - current HTTP request

Returns:

a matching handler, or null if not found

Throws:

Exception

Since:

5.3

lookupHandler

@Nullable
protected Object lookupHandler(String lookupPath,
                                         HttpServletRequest request)
                                  throws Exception

Look up a handler instance for the given URL path. This method is used when String pattern matching with PathMatcher is in use.

Parameters:

lookupPath - the path to match patterns against

request - current HTTP request

Returns:

a matching handler, or null if not found

Throws:

Exception

See Also:

exposePathWithinMapping(java.lang.String, java.lang.String, javax.servlet.http.HttpServletRequest), AntPathMatcher

validateHandler

protected void validateHandler(Object handler,
                               HttpServletRequest request)
                        throws Exception

Validate the given handler against the current request.

The default implementation is empty. Can be overridden in subclasses, for example to enforce specific preconditions expressed in URL mappings.

Parameters:

handler - the handler object to validate

request - current HTTP request

Throws:

Exception - if validation failed

buildPathExposingHandler

protected Object buildPathExposingHandler(Object rawHandler,
                                          String bestMatchingPattern,
                                          String pathWithinMapping,
                                          @Nullable
                                          Map<String,String> uriTemplateVariables)

Build a handler object for the given raw handler, exposing the actual handler, the HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE, as well as the HandlerMapping.URI_TEMPLATE_VARIABLES_ATTRIBUTE before executing the handler.

The default implementation builds a HandlerExecutionChain with a special interceptor that exposes the path attribute and URI template variables

Parameters:

rawHandler - the raw handler to expose

pathWithinMapping - the path to expose before executing the handler

uriTemplateVariables - the URI template variables, can be null if no variables found

Returns:

the final handler object

exposePathWithinMapping

protected void exposePathWithinMapping(String bestMatchingPattern,
                                       String pathWithinMapping,
                                       HttpServletRequest request)

Expose the path within the current mapping as request attribute.

Parameters:

pathWithinMapping - the path within the current mapping

request - the request to expose the path to

See Also:

HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE

exposeUriTemplateVariables

protected void exposeUriTemplateVariables(Map<String,String> uriTemplateVariables,
                                          HttpServletRequest request)

Expose the URI templates variables as request attribute.

Parameters:

uriTemplateVariables - the URI template variables

request - the request to expose the path to

See Also:

HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE

match

@Nullable
public RequestMatchResult match(HttpServletRequest request,
                                          String pattern)

Description copied from interface: MatchableHandlerMapping

Determine whether the request matches the given pattern. Use this method when MatchableHandlerMapping.getPatternParser() returns null which means that the HandlerMapping is uses String pattern matching.

Specified by:

match in interface MatchableHandlerMapping

Parameters:

request - the current request

pattern - the pattern to match

Returns:

the result from request matching, or null if none

registerHandler

protected void registerHandler(String[] urlPaths,
                               String beanName)
                        throws BeansException,
                               IllegalStateException

Register the specified handler for the given URL paths.

Parameters:

urlPaths - the URLs that the bean should be mapped to

beanName - the name of the handler bean

Throws:

BeansException - if the handler couldn't be registered

IllegalStateException - if there is a conflicting handler registered

registerHandler

protected void registerHandler(String urlPath,
                               Object handler)
                        throws BeansException,
                               IllegalStateException

Register the specified handler for the given URL path.

Parameters:

urlPath - the URL the bean should be mapped to

handler - the handler instance or handler bean name String (a bean name will automatically be resolved into the corresponding handler bean)

Throws:

BeansException - if the handler couldn't be registered

IllegalStateException - if there is a conflicting handler registered

getHandlerMap

public final Map<String,Object> getHandlerMap()

Return the handler mappings as a read-only Map, with the registered path or pattern as key and the handler object (or handler bean name in case of a lazy-init handler), as value.

See Also:

AbstractHandlerMapping.getDefaultHandler()

getPathPatternHandlerMap

public final Map<PathPattern,Object> getPathPatternHandlerMap()

Identical to getHandlerMap() but populated when parsed patterns are enabled; otherwise empty.

Since:

5.3

supportsTypeLevelMappings

protected boolean supportsTypeLevelMappings()

Indicates whether this handler mapping support type-level mappings. Default to false.