org.web_auth.utils
Class ActionUtils

java.lang.Object
  org.web_auth.utils.ActionUtils

public class ActionUtils

extends java.lang.Object

This class provides utility functions for struts actions.

Version:

1.0

Author:

Zhengrong Tang

Field Summary

static java.lang.String	ACTION_FAILURE
static java.lang.String	ACTION_SUCCESS
static java.lang.String	UserClass
static java.lang.String	UserSessionClass

Constructor Summary

ActionUtils()

Method Summary

static java.lang.Object

getObject(org.apache.struts.action.ActionMapping actionMapping, java.lang.String paramName) This method finds the value of a parameter defined in a struts action mapping.

Methods inherited from class java.lang.Object

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

Field Detail

UserClass

public static final java.lang.String UserClass

See Also:

Constant Field Values

UserSessionClass

public static final java.lang.String UserSessionClass

See Also:

Constant Field Values

ACTION_SUCCESS

public static final java.lang.String ACTION_SUCCESS

See Also:

Constant Field Values

ACTION_FAILURE

public static final java.lang.String ACTION_FAILURE

See Also:

Constant Field Values

Constructor Detail

ActionUtils

public ActionUtils()

Method Detail

getObject

public static java.lang.Object getObject(org.apache.struts.action.ActionMapping actionMapping,
                                         java.lang.String paramName)
                                  throws ActionMappingException

This method finds the value of a parameter defined in a struts action mapping. The value is expected to be a class name. This method then returns an instance of the class.

 For example, an struts action mapping might be
  <action path="/members/login"
          type="org.web_auth.ui.action.LoginAction"
          name="loginForm"
          input="/members/login.jsp"
          parameter="UserClass=application.Member;UserSessionClass=application.MemberSession"
          scope="request">
  </action>
 

A call of ActionUtils.getObject(actionMapping, "UserClass") would return an instance of application.Member.
A call of ActionUtils.getObject(actionMapping, "UserSessionClass") would return an instance of application.MemberSession.

For efficiency, a read-only cache is used.

Parameters:

actionMapping - a struts action mapping

paramName - a parameter name defined in "parameter" of this action mapping

Returns:

an instance of a class, whose name is the value of the parameter name

Throws:

ActionMappingException - if the expected parameter name cannot be found in the action mapping or if class cannot be found or any other expected exception happens