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

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org.springframework.web.jsf
Class DelegatingVariableResolver

java.lang.Object
  javax.faces.el.VariableResolver
      org.springframework.web.jsf.DelegatingVariableResolver

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public class DelegatingVariableResolver
extends javax.faces.el.VariableResolver

JSF VariableResolver that first delegates to the original resolver of the underlying JSF implementation, then to the Spring root WebApplicationContext.

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

 <application>
   ...
   <variable-resolver>org.springframework.web.jsf.DelegatingVariableResolver</variable-resolver>
 </application>

All your JSF expressions can then implicitly refer to the names of Spring-managed service layer beans, for example in property values of JSF-managed beans:

 <managed-bean>
   <managed-bean-name>myJsfManagedBean</managed-bean-name>
   <managed-bean-class>example.MyJsfManagedBean</managed-bean-class>
   <managed-bean-scope>session</managed-bean-scope>
   <managed-property>
     <property-name>mySpringManagedBusinessObject</property-name>
     <value>#{mySpringManagedBusinessObject}</value>
   </managed-property>
 </managed-bean>

with "mySpringManagedBusinessObject" defined as Spring bean in applicationContext.xml:

 <bean id="mySpringManagedBusinessObject" class="example.MySpringManagedBusinessObject">
   ...
 </bean>

Since:

1.1

Author:

Juergen Hoeller

See Also:

WebApplicationContextVariableResolver, FacesContextUtils.getRequiredWebApplicationContext(javax.faces.context.FacesContext)

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Field Summary
protected  Log	logger           Logger available to subclasses
protected  javax.faces.el.VariableResolver	originalVariableResolver

 

Constructor Summary
DelegatingVariableResolver(javax.faces.el.VariableResolver originalVariableResolver)           Create a new DelegatingVariableResolver, using the given original VariableResolver.

 

Method Summary
protected  BeanFactory	getBeanFactory(javax.faces.context.FacesContext facesContext)           Retrieve the Spring BeanFactory to delegate bean name resolution to.
protected  javax.faces.el.VariableResolver	getOriginalVariableResolver()           Return the original JSF VariableResolver that this resolver delegates to.
protected  WebApplicationContext	getWebApplicationContext(javax.faces.context.FacesContext facesContext)           Retrieve the web application context to delegate bean name resolution to.
Object	resolveVariable(javax.faces.context.FacesContext facesContext, String name)           Delegate to the original VariableResolver first, then try to resolve the variable as Spring bean in the root WebApplicationContext.

 

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

 

Field Detail

logger

protected final Log logger

Logger available to subclasses

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originalVariableResolver

protected final javax.faces.el.VariableResolver originalVariableResolver

Constructor Detail

DelegatingVariableResolver

public DelegatingVariableResolver(javax.faces.el.VariableResolver originalVariableResolver)

Create a new DelegatingVariableResolver, using the given original VariableResolver.

A JSF implementation will automatically pass its original resolver into the constructor of a configured resolver, provided that there is a corresponding constructor argument.

Parameters:

originalVariableResolver - the original VariableResolver

Method Detail

getOriginalVariableResolver

protected final javax.faces.el.VariableResolver getOriginalVariableResolver()

Return the original JSF VariableResolver that this resolver delegates to. Used to resolve standard JSF-managed beans.

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resolveVariable

public Object resolveVariable(javax.faces.context.FacesContext facesContext,
                              String name)
                       throws javax.faces.el.EvaluationException

Delegate to the original VariableResolver first, then try to resolve the variable as Spring bean in the root WebApplicationContext.

Specified by:

resolveVariable in class javax.faces.el.VariableResolver

Throws:

javax.faces.el.EvaluationException

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getBeanFactory

protected BeanFactory getBeanFactory(javax.faces.context.FacesContext facesContext)

Retrieve the Spring BeanFactory to delegate bean name resolution to.

The 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)

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getWebApplicationContext

protected WebApplicationContext getWebApplicationContext(javax.faces.context.FacesContext facesContext)

Retrieve the web application context to delegate bean name resolution to.

The 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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