WebApplicationContextVariableResolver (Spring Framework) - Spring Framework 1.2.9 API 文档英文版

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org.springframework.web.jsf
Class WebApplicationContextVariableResolver

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

public class WebApplicationContextVariableResolver
extends javax.faces.el.VariableResolver
extends javax.faces.el.VariableResolver

Special VariableResolver that exposes the Spring WebApplicationContext instance under a variable named "webApplicationContext".

In contrast to DelegatingVariableResolver, this VariableResolver does not resolve JSF variable names as Spring bean names. It rather exposes Spring's root WebApplicationContext itself under a special name. JSF-managed beans can then use Spring's WebApplicationContext API to retrieve Spring-managed beans, access resources, etc.

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

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

Since:: 1.2.5
Author:: Colin Sampaleanu, Juergen Hoeller
See Also:: DelegatingVariableResolver, FacesContextUtils.getWebApplicationContext(javax.faces.context.FacesContext)

Field Summary

protected javax.faces.el.VariableResolver originalVariableResolver


static String WEB_APPLICATION_CONTEXT_VARIABLE_NAME
          Name of the exposed WebApplicationContext variable: "webApplicationContext".

Constructor Summary

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

Method Summary

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 WebApplicationContext reference to expose.

Object resolveVariable(javax.faces.context.FacesContext context, String name)
          Check for the special "webApplicationContext" variable first, then delegate to the original VariableResolver.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Summary
`protected javax.faces.el.VariableResolver`	`originalVariableResolver`
`static String`	`WEB_APPLICATION_CONTEXT_VARIABLE_NAME` Name of the exposed WebApplicationContext variable: "webApplicationContext".

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

Method Summary
`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 WebApplicationContext reference to expose.
`Object`	`resolveVariable(javax.faces.context.FacesContext context, String name)` Check for the special "webApplicationContext" variable first, then delegate to the original VariableResolver.

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

Field Detail

WEB_APPLICATION_CONTEXT_VARIABLE_NAME

public static final String WEB_APPLICATION_CONTEXT_VARIABLE_NAME

Name of the exposed WebApplicationContext variable: "webApplicationContext".

See Also:: Constant Field Values

originalVariableResolver

protected final javax.faces.el.VariableResolver originalVariableResolver

Constructor Detail

WebApplicationContextVariableResolver

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

Create a new WebApplicationContextVariableResolver, 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.

resolveVariable

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

Check for the special "webApplicationContext" variable first, then delegate to the original VariableResolver.

If no WebApplicationContext is available, all requests will be delegated to the original VariableResolver.

Specified by:: resolveVariable in class javax.faces.el.VariableResolver

Throws:: javax.faces.el.EvaluationException

getWebApplicationContext

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

Retrieve the WebApplicationContext reference to expose.

Default implementation delegates to FacesContextUtils, returning null if no WebApplicationContext found.

Parameters:: facesContext - the current JSF context
Returns:: the Spring web application context
See Also:: FacesContextUtils.getWebApplicationContext(javax.faces.context.FacesContext)