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:

org.springframework.beans.factory.Aware, org.springframework.context.ApplicationContextAware, org.springframework.core.Ordered, org.springframework.web.context.ServletContextAware, HandlerMapping

Direct Known Subclasses:

AbstractDetectingUrlHandlerMapping, SimpleUrlHandlerMapping

public abstract class AbstractUrlHandlerMapping
extends AbstractHandlerMapping

Abstract base class for URL-mapped HandlerMapping implementations. Provides infrastructure for mapping handlers to URLs and configurable URL lookup. For information on the latter, see "alwaysUseFullPath" property.

Supports direct matches, e.g. a registered "/test" matches "/test", and various Ant-style pattern matches, e.g. a registered "/t*" pattern matches both "/test" and "/team", "/test/*" matches all paths in the "/test" directory, "/test/**" matches all paths below "/test". For details, see the AntPathMatcher javadoc.

Will search all path patterns to find the most exact match for the current request path. The most exact match is defined as 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_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
AbstractUrlHandlerMapping()

Method Summary

Methods

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 registered handlers as an unmodifiable Map, with the registered path as key and the handler object (or handler bean name in case of a lazy-init handler) as value.
Object	getRootHandler() Return the root handler for this handler mapping (registered for "/"), or null if none.
protected Object	lookupHandler(String urlPath, HttpServletRequest request) Look up a handler instance for the given URL path.
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	setRootHandler(Object rootHandler) Set the root handler for this handler mapping, that is, the handler to be registered for the root path ("/").
protected boolean	supportsTypeLevelMappings() Indicates whether this handler mapping support type-level mappings.
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, 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

AbstractUrlHandlerMapping

public AbstractUrlHandlerMapping()

Method Detail

setRootHandler

public void setRootHandler(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

public Object getRootHandler()

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

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

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

protected Object lookupHandler(String urlPath,
                   HttpServletRequest request)
                        throws Exception

Look up a handler instance for the given URL path.

Supports direct matches, e.g. a registered "/test" matches "/test", and various Ant-style pattern matches, e.g. a registered "/t*" matches both "/test" and "/team". For details, see the AntPathMatcher class.

Looks for the most exact pattern, where most exact is defined as the longest path pattern.

Parameters:

urlPath - URL the bean is mapped to

request - current HTTP request (to expose the path within the mapping to)

Returns:

the associated handler instance, 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,
                              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

registerHandler

protected void registerHandler(String[] urlPaths,
                   String beanName)
                        throws org.springframework.beans.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:

org.springframework.beans.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 org.springframework.beans.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:

org.springframework.beans.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 registered handlers as an unmodifiable Map, with the registered path as key and the handler object (or handler bean name in case of a lazy-init handler) as value.

See Also:

AbstractHandlerMapping.getDefaultHandler()

supportsTypeLevelMappings

protected boolean supportsTypeLevelMappings()

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