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DelegatingNavigationHandlerProxy (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.web.jsf
Class DelegatingNavigationHandlerProxy

java.lang.Object
  extended by javax.faces.application.NavigationHandler
      extended by org.springframework.web.jsf.DelegatingNavigationHandlerProxy

public class DelegatingNavigationHandlerProxy
extends javax.faces.application.NavigationHandler

JSF NavigationHandler implementation that delegates to a NavigationHandler bean obtained from the Spring root WebApplicationContext.

Configure this handler proxy in your faces-config.xml file as follows: 

 <application>
   ...
   <navigation-handler>
           org.springframework.web.jsf.DelegatingNavigationHandlerProxy
   </navigation-handler>
   ...
 </application>
By default, the Spring ApplicationContext will be searched for the NavigationHandler under the bean name "jsfNavigationHandler". In the simplest case, this is a plain Spring bean definition like the following. However, all of Spring's bean configuration power can be applied to such a bean, in particular all flavors of dependency injection. 
 <bean name="jsfNavigationHandler" class="mypackage.MyNavigationHandler">
   <property name="myProperty" ref="myOtherBean"/>
 </bean>
The target NavigationHandler bean will typically extend the standard JSF NavigationHandler class. However, note that decorating the original NavigationHandler (the JSF provider's default handler) is not supported in such a scenario, since we can't inject the original handler in standard JSF style (that is, as constructor argument).

For decorating the original NavigationHandler, make sure that your target bean extends Spring's DecoratingNavigationHandler class. This allows to pass in the original handler as method argument, which this proxy automatically detects. Note that a DecoratingNavigationHandler subclass will still work as standard JSF NavigationHandler as well!

This proxy may be subclassed to change the bean name used to search for the navigation handler, change the strategy used to obtain the target handler, or change the strategy used to access the ApplicationContext (normally obtained via FacesContextUtils.getWebApplicationContext(FacesContext)).

Since:
1.2.7
Author:
Juergen Hoeller, Colin Sampaleanu
See Also:
DecoratingNavigationHandler

Field Summary
static String DEFAULT_TARGET_BEAN_NAME
          Default name of the target bean in the Spring application context: "jsfNavigationHandler"
 
Constructor Summary
DelegatingNavigationHandlerProxy()
          Create a new DelegatingNavigationHandlerProxy.
DelegatingNavigationHandlerProxy(javax.faces.application.NavigationHandler originalNavigationHandler)
          Create a new DelegatingNavigationHandlerProxy.
 
Method Summary
protected  BeanFactory getBeanFactory(javax.faces.context.FacesContext facesContext)
          Retrieve the Spring BeanFactory to delegate bean name resolution to.
protected  javax.faces.application.NavigationHandler getDelegate(javax.faces.context.FacesContext facesContext)
          Return the target NavigationHandler to delegate to.
protected  String getTargetBeanName(javax.faces.context.FacesContext facesContext)
          Return the name of the target NavigationHandler bean in the BeanFactory.
protected  WebApplicationContext getWebApplicationContext(javax.faces.context.FacesContext facesContext)
          Retrieve the web application context to delegate bean name resolution to.
 void handleNavigation(javax.faces.context.FacesContext facesContext, String fromAction, String outcome)
          Handle the navigation request implied by the specified parameters, through delegating to the target bean in the Spring application context.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

DEFAULT_TARGET_BEAN_NAME

public static final String DEFAULT_TARGET_BEAN_NAME
Default name of the target bean in the Spring application context: "jsfNavigationHandler"

See Also:
Constant Field Values
Constructor Detail

DelegatingNavigationHandlerProxy

public DelegatingNavigationHandlerProxy()
Create a new DelegatingNavigationHandlerProxy.

DelegatingNavigationHandlerProxy

public DelegatingNavigationHandlerProxy(javax.faces.application.NavigationHandler originalNavigationHandler)
Create a new DelegatingNavigationHandlerProxy.

Parameters:
originalNavigationHandler - the original NavigationHandler
Method Detail

handleNavigation

public void handleNavigation(javax.faces.context.FacesContext facesContext,
                             String fromAction,
                             String outcome)
Handle the navigation request implied by the specified parameters, through delegating to the target bean in the Spring application context.

The target bean needs to extend the JSF NavigationHandler class. If it extends Spring's DecoratingNavigationHandler, the overloaded handleNavigation method with the original NavigationHandler as argument will be used. Else, the standard handleNavigation method will be called.

Specified by:
handleNavigation in class javax.faces.application.NavigationHandler

getDelegate

protected javax.faces.application.NavigationHandler getDelegate(javax.faces.context.FacesContext facesContext)
Return the target NavigationHandler to delegate to.

By default, a bean with the name "jsfNavigationHandler" is obtained from the Spring root WebApplicationContext, for every invocation.

Parameters:
facesContext - the current JSF context
Returns:
the target NavigationHandler to delegate to
See Also:
getTargetBeanName(javax.faces.context.FacesContext), getBeanFactory(javax.faces.context.FacesContext)

getTargetBeanName

protected String getTargetBeanName(javax.faces.context.FacesContext facesContext)
Return the name of the target NavigationHandler bean in the BeanFactory. Default is "jsfNavigationHandler".

Parameters:
facesContext - the current JSF context
Returns:
the name of the target bean

getBeanFactory

protected BeanFactory getBeanFactory(javax.faces.context.FacesContext facesContext)
Retrieve the Spring BeanFactory to delegate bean name resolution to.

Default implementation delegates to getWebApplicationContext. Can be overridden to provide an arbitrary BeanFactory reference to resolve against; usually, this will be a full Spring ApplicationContext.

Parameters:
facesContext - the current JSF context
Returns:
the Spring BeanFactory (never null)
See Also:
getWebApplicationContext(javax.faces.context.FacesContext)

getWebApplicationContext

protected WebApplicationContext getWebApplicationContext(javax.faces.context.FacesContext facesContext)
Retrieve the web application context to delegate bean name resolution to.

Default implementation delegates to FacesContextUtils.

Parameters:
facesContext - the current JSF context
Returns:
the Spring web application context (never null)
See Also:
FacesContextUtils.getRequiredWebApplicationContext(javax.faces.context.FacesContext)
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