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ParameterHandlerMapping (Spring Framework API 2.1) - Spring Framework 2.1.0 API 文档英文版

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org.springframework.web.portlet.handler
Class ParameterHandlerMapping

java.lang.Object
  org.springframework.context.support.ApplicationObjectSupport
      org.springframework.web.portlet.handler.AbstractHandlerMapping
          org.springframework.web.portlet.handler.AbstractMapBasedHandlerMapping
              org.springframework.web.portlet.handler.ParameterHandlerMapping

All Implemented Interfaces:

ApplicationContextAware, Ordered, HandlerMapping

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public class ParameterHandlerMapping
extends AbstractMapBasedHandlerMapping

Implementation of the HandlerMapping interface to map from a request parameter to request handler beans.

The default name of the parameter is "action", but can be changed using setParameterName().

The bean configuration for this mapping will look somthing like this:

 <bean id="parameterHandlerMapping" class="org.springframework.web.portlet.handler.ParameterHandlerMapping">
   <property name="parameterMap">
     <map>
             <entry key="add"><ref bean="addItemHandler"/></entry>
       <entry key="edit"><ref bean="editItemHandler"/></entry>
       <entry key="delete"><ref bean="deleteItemHandler"/></entry>
     </map>
   </property>
 </bean>

Thanks to Rainer Schmitz for suggesting this mapping strategy!

Since:

2.0

Author:

John A. Lewis, Juergen Hoeller

See Also:

ParameterMappingInterceptor

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Field Summary
static String	DEFAULT_PARAMETER_NAME           Default request parameter name to use for mapping to handlers: "action".

 

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

 

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

 

Constructor Summary
ParameterHandlerMapping()

 

Method Summary
protected  Object	getLookupKey(PortletRequest request)           Uses the value of the specified parameter as lookup key.
void	initApplicationContext()           Calls the registerHandlers method in addition to the superclass's initialization.
protected  void	registerHandlers(Map parameterMap)           Register all handlers specified in the Portlet mode map for the corresponding modes.
void	setParameterMap(Map parameterMap)           Set a Map with parameters as keys and handler beans or bean names as values.
void	setParameterName(String parameterName)           Set the name of the parameter used for mapping to handlers.

 

Methods inherited from class org.springframework.web.portlet.handler.AbstractMapBasedHandlerMapping
getHandlerInternal, registerHandler, setLazyInitHandlers

 

Methods inherited from class org.springframework.web.portlet.handler.AbstractHandlerMapping
adaptInterceptor, extendInterceptors, getAdaptedInterceptors, getDefaultHandler, getHandler, getHandlerExecutionChain, getOrder, initInterceptors, setApplyWebRequestInterceptorsToRenderPhaseOnly, setDefaultHandler, setInterceptors, setOrder

 

Methods inherited from class org.springframework.context.support.ApplicationObjectSupport
getApplicationContext, getMessageSourceAccessor, isContextRequired, requiredContextClass, setApplicationContext

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

DEFAULT_PARAMETER_NAME

public static final String DEFAULT_PARAMETER_NAME

Default request parameter name to use for mapping to handlers: "action".

See Also:

Constant Field Values

Constructor Detail

ParameterHandlerMapping

public ParameterHandlerMapping()

Method Detail

setParameterName

public void setParameterName(String parameterName)

Set the name of the parameter used for mapping to handlers.

Default is "action".

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setParameterMap

public void setParameterMap(Map parameterMap)

Set a Map with parameters as keys and handler beans or bean names as values. Convenient for population with bean references.

Parameters:

parameterMap - map with parameters as keys and beans as values

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initApplicationContext

public void initApplicationContext()
                            throws BeansException

Calls the registerHandlers method in addition to the superclass's initialization.

Overrides:

initApplicationContext in class AbstractHandlerMapping

Throws:

ApplicationContextException - in case of initialization errors

BeansException - if thrown by ApplicationContext methods

See Also:

registerHandlers(java.util.Map)

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registerHandlers

protected void registerHandlers(Map parameterMap)
                         throws BeansException

Register all handlers specified in the Portlet mode map for the corresponding modes.

Overrides:

registerHandlers in class AbstractMapBasedHandlerMapping

Parameters:

parameterMap - Map with parameter names as keys and handler beans or bean names as values

Throws:

BeansException - if the handler couldn't be registered

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getLookupKey

protected Object getLookupKey(PortletRequest request)
                       throws Exception

Uses the value of the specified parameter as lookup key.

Specified by:

getLookupKey in class AbstractMapBasedHandlerMapping

Parameters:

request - current portlet request

Returns:

the lookup key (never null)

Throws:

Exception - if key computation failed

See Also:

setParameterName(java.lang.String)

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