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## org.springframework.web.servlet.handler
Class AbstractHandlerMapping

    java.lang.Object
      org.springframework.context.support.ApplicationObjectSupport
          org.springframework.web.context.support.WebApplicationObjectSupport
              org.springframework.web.servlet.handler.AbstractHandlerMapping

All Implemented Interfaces:
  ApplicationContextAware, Ordered, ServletContextAware, HandlerMapping

Direct Known Subclasses:
  AbstractUrlHandlerMapping

    public abstract class AbstractHandlerMapping

extends WebApplicationObjectSupport
implements HandlerMapping, Ordered

Abstract base class for `HandlerMapping` implementations. Supports ordering, a default handler, and handler interceptors.

Note: This base class does not support exposure of the `HandlerMapping.PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE`. Support for this attribute is up to concrete subclasses, typically based on request URL mappings.

Since:
  07.04.2003
Author:
  Juergen Hoeller
See Also:
  `getHandlerInternal(javax.servlet.http.HttpServletRequest)`, `setDefaultHandler(java.lang.Object)`, `setInterceptors(java.lang.Object[])`, `HandlerInterceptor`

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, PATH_WITHIN_HANDLER_MAPPING_ATTRIBUTE, URI_TEMPLATE_VARIABLES_ATTRIBUTE`

Fields inherited from interface org.springframework.core.Ordered
`HIGHEST_PRECEDENCE, LOWEST_PRECEDENCE`

Constructor Summary
`AbstractHandlerMapping()`

Method Summary
`protected HandlerInterceptor` | `adaptInterceptor(Object interceptor)` Adapt the given interceptor object to the HandlerInterceptor interface.
`protected void` | `extendInterceptors(List<Object> interceptors)` Extension hook that subclasses can override to register additional interceptors, given the configured interceptors (see `setInterceptors(java.lang.Object[])`).
`protected HandlerInterceptor[]` | `getAdaptedInterceptors()` Return the adapted interceptors as HandlerInterceptor array.
`Object` | `getDefaultHandler()` Return the default handler for this handler mapping, or `null` if none.
`HandlerExecutionChain` | `getHandler(HttpServletRequest request)` Look up a handler for the given request, falling back to the default handler if no specific one is found.
`protected HandlerExecutionChain` | `getHandlerExecutionChain(Object handler, HttpServletRequest request)` Build a HandlerExecutionChain for the given handler, including applicable interceptors.
`protected abstract Object` | `getHandlerInternal(HttpServletRequest request)` Look up a handler for the given request, returning `null` if no specific one is found.
`int` | `getOrder()` Return the order value of this object, with a higher value meaning greater in terms of sorting.
`protected void` | `initApplicationContext()` Initializes the interceptors.
`protected void` | `initInterceptors()` Initialize the specified interceptors, adapting them where necessary.
`void` | `setDefaultHandler(Object defaultHandler)` Set the default handler for this handler mapping.
`void` | `setInterceptors(Object[] interceptors)` Set the interceptors to apply for all handlers mapped by this handler mapping.
`void` | `setOrder(int order)` Specify the order value for this HandlerMapping bean.

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

### AbstractHandlerMapping

    public AbstractHandlerMapping()

Method Detail

### setOrder

    public final void setOrder(int order)

  Specify the order value for this HandlerMapping bean.

  Default value is `Integer.MAX_VALUE`, meaning that it's non-ordered.

  See Also:
    `Ordered.getOrder()`

### getOrder

    public final int getOrder()

  Description copied from interface: `Ordered`
  Return the order value of this object, with a higher value meaning greater in terms of sorting.

  Normally starting with 0, with `Integer.MAX_VALUE` indicating the greatest value. Same order values will result in arbitrary positions for the affected objects.

  Higher values can be interpreted as lower priority. As a consequence, the object with the lowest value has highest priority (somewhat analogous to Servlet "load-on-startup" values).

  Specified by:
    `getOrder` in interface `Ordered`
  Returns:
    the order value

### setDefaultHandler

    public void setDefaultHandler(Object defaultHandler)

  Set the default handler for this handler mapping. This handler will be returned if no specific mapping was found.

  Default is `null`, indicating no default handler.

### getDefaultHandler

    public Object getDefaultHandler()

  Return the default handler for this handler mapping, or `null` if none.

### setInterceptors

    public void setInterceptors(Object[] interceptors)

  Set the interceptors to apply for all handlers mapped by this handler mapping.

  Supported interceptor types are HandlerInterceptor and WebRequestInterceptor.

  Parameters:
    `interceptors` - array of handler interceptors, or `null` if none
  See Also:
    `adaptInterceptor(java.lang.Object)`, `HandlerInterceptor`, `WebRequestInterceptor`

### initApplicationContext

    protected void initApplicationContext()
                                   throws BeansException

  Initializes the interceptors.

  Overrides:
    `initApplicationContext` in class `ApplicationObjectSupport`
  Throws:
    `ApplicationContextException` - in case of initialization errors
    `BeansException` - if thrown by ApplicationContext methods
  See Also:
    `extendInterceptors(java.util.List)`, `initInterceptors()`

### extendInterceptors

    protected void extendInterceptors(List<Object> interceptors)

  Extension hook that subclasses can override to register additional interceptors, given the configured interceptors (see `setInterceptors(java.lang.Object[])`).

  Will be invoked before `initInterceptors()` adapts the specified interceptors into `HandlerInterceptor` instances.

  The default implementation is empty.

  Parameters:
    `interceptors` - the configured interceptor List (never `null`), allowing to add further interceptors before as well as after the existing interceptors

### initInterceptors

    protected void initInterceptors()

  Initialize the specified interceptors, adapting them where necessary.

  See Also:
    `setInterceptors(java.lang.Object[])`, `adaptInterceptor(java.lang.Object)`

### adaptInterceptor

    protected HandlerInterceptor adaptInterceptor(Object interceptor)

  Adapt the given interceptor object to the HandlerInterceptor interface.

  Supported interceptor types are HandlerInterceptor and WebRequestInterceptor. Each given WebRequestInterceptor will be wrapped in a WebRequestHandlerInterceptorAdapter. Can be overridden in subclasses.

  Parameters:
    `interceptor` - the specified interceptor object
  Returns:
    the interceptor wrapped as HandlerInterceptor
  See Also:
    `HandlerInterceptor`, `WebRequestInterceptor`, `WebRequestHandlerInterceptorAdapter`

### getAdaptedInterceptors

    protected final HandlerInterceptor[] getAdaptedInterceptors()

  Return the adapted interceptors as HandlerInterceptor array.

  Returns:
    the array of HandlerInterceptors, or `null` if none

### getHandler

    public final HandlerExecutionChain getHandler(HttpServletRequest request)
                                           throws Exception

  Look up a handler for the given request, falling back to the default handler if no specific one is found.

  Specified by:
    `getHandler` in interface `HandlerMapping`
  Parameters:
    `request` - current HTTP request
  Returns:
    the corresponding handler instance, or the default handler
  Throws:
    `Exception` - if there is an internal error
  See Also:
    `getHandlerInternal(javax.servlet.http.HttpServletRequest)`

### getHandlerInternal

    protected abstract Object getHandlerInternal(HttpServletRequest request)
                                          throws Exception

  Look up a handler for the given request, returning `null` if no specific one is found. This method is called by `getHandler(javax.servlet.http.HttpServletRequest)`; a `null` return value will lead to the default handler, if one is set.

  Note: This method may also return a pre-built `HandlerExecutionChain`, combining a handler object with dynamically determined interceptors. Statically specified interceptors will get merged into such an existing chain.

  Parameters:
    `request` - current HTTP request
  Returns:
    the corresponding handler instance, or `null` if none found
  Throws:
    `Exception` - if there is an internal error

### getHandlerExecutionChain

    protected HandlerExecutionChain getHandlerExecutionChain(Object handler,
                                                             HttpServletRequest request)

  Build a HandlerExecutionChain for the given handler, including applicable interceptors.

  The default implementation simply builds a standard HandlerExecutionChain with the given handler and this handler mapping's common interceptors. Subclasses may override this in order to extend/rearrange the list of interceptors.

  NOTE: The passed-in handler object may be a raw handler or a pre-built HandlerExecutionChain. This method should handle those two cases explicitly, either building a new HandlerExecutionChain or extending the existing chain.

  For simply adding an interceptor, consider calling `super.getHandlerExecutionChain` and invoking `HandlerExecutionChain.addInterceptor(org.springframework.web.servlet.HandlerInterceptor)` on the returned chain object.

  Parameters:
    `handler` - the resolved handler instance (never `null`)
    `request` - current HTTP request
  Returns:
    the HandlerExecutionChain (never `null`)
  See Also:
    `getAdaptedInterceptors()`

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