Examples of com.opensymphony.xwork2.interceptor.ChainingInterceptor

Package com.opensymphony.xwork2.interceptor

Examples of com.opensymphony.xwork2.interceptor.ChainingInterceptor

com.opensymphony.xwork2.ActionContext
An interceptor that copies all the properties of every object in the value stack to the currently executing object, except for any object that implements {@link Unchainable}. A collection of optional includes and excludes may be provided to control how and which parameters are copied. Only includes or excludes may be specified. Specifying both results in undefined behavior. See the javadocs for {@link ReflectionProvider#copy(Object,Object,java.util.Map,java.util.Collection,java.util.Collection)} for more information.

Note: It is important to remember that this interceptor does nothing if there are no objects already on the stack.
This means two things:
One, you can safely apply it to all your actions without any worry of adverse affects.
Two, it is up to you to ensure an object exists in the stack prior to invoking this action. The most typical way this is done is through the use of the chain result type, which combines with this interceptor to make up the action chaining feature.
Note: By default Errors, Field errors and Message aren't copied during chaining, to change the behaviour you can specify the below three constants in struts.properties or struts.xml:
- struts.xwork.chaining.copyErrors - set to true to copy Action Errors
- struts.xwork.chaining.copyFieldErrors - set to true to copy Field Errors
- struts.xwork.chaining.copyMessages - set to true to copy Action Messages
Example:
```
 <constant name="struts.xwork.chaining.copyErrors" value="true"/> 
```
Note: By default actionErrors and actionMessages are excluded when copping object's properties.
Interceptor parameters:
- excludes (optional) - the list of parameter names to exclude from copying (all others will be included).
- includes (optional) - the list of parameter names to include when copying (all others will be excluded).
Extending the interceptor:
There are no known extension points to this interceptor.
Example code:
```
   <action name="someAction" class="com.examples.SomeAction"> <interceptor-ref name="basicStack"/> <result name="success" type="chain">otherAction</result> </action> 
 <action name="otherAction" class="com.examples.OtherAction"> <interceptor-ref name="chain"/> <interceptor-ref name="basicStack"/> <result name="success">good_result.ftl</result> </action> 
  
```
@author mrdon @author tm_jee ( tm_jee(at)yahoo.co.uk ) @see com.opensymphony.xwork2.ActionChainResult

public class SimpleServletConfigInterceptor extends AbstractInterceptor implements StrutsStatics {
  private static final long serialVersionUID = -595817586173434580L;


  public String intercept(ActionInvocation invocation) throws Exception {
    final Object action = invocation.getAction();
    final ActionContext context = invocation.getInvocationContext();


    if (action instanceof ServletRequestAware) {
      HttpServletRequest request = (HttpServletRequest) context.get(HTTP_REQUEST);
      ((ServletRequestAware) action).setServletRequest(request);
    }


    if (action instanceof ServletResponseAware) {
      HttpServletResponse response = (HttpServletResponse) context.get(HTTP_RESPONSE);
      ((ServletResponseAware) action).setServletResponse(response);
    }


    return invocation.invoke();
  }

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  public Map<String, List<String>> getFieldErrors() {
    return validationAware.getFieldErrors();
  }


  public Locale getLocale() {
    ActionContext ctx = ActionContext.getContext();
    if (ctx != null) {
      return ctx.getLocale();
    } else {
      logger.debug("Action context not initialized");
      return null;
    }
  }

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  protected ClassLoaderInterface getClassLoaderInterface() {
    if (isReloadEnabled()) return new ClassLoaderInterfaceDelegate(reloadingClassLoader);
    else {
      ClassLoaderInterface classLoaderInterface = null;
      ActionContext ctx = ActionContext.getContext();
      if (ctx != null) classLoaderInterface = (ClassLoaderInterface) ctx
          .get(ClassLoaderInterface.CLASS_LOADER_INTERFACE);
      return (ClassLoaderInterface) ObjectUtils.defaultIfNull(classLoaderInterface,
          new ClassLoaderInterfaceDelegate(getClassLoader()));
    }
  }

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    public void clearActionErrors()
    {
        actionError = null;
        fieldErrors = null;
        // Remove from Session
        ActionContext context = ActionContext.getContext();
        if (context!=null)
            context.getSession().remove(LAST_ACTION_ERROR_ATTRIBUTE);
    }

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    /*
     * @see org.apache.empire.struts2.action.ActionErrorProvider#getLastActionError(boolean)
     */
    public ErrorInfo getLastActionError(boolean clear)
    {
        ActionContext context = ActionContext.getContext();
        ErrorInfo error = (ErrorInfo)context.getSession().get(LAST_ACTION_ERROR_ATTRIBUTE);
        if (clear)
            context.getSession().remove(LAST_ACTION_ERROR_ATTRIBUTE);
        return error;
    }

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        if (error instanceof ActionError)
            actionError = ((ActionError)error);
        else 
            actionError = new ActionError(error);
        // put Error on session
        ActionContext context = ActionContext.getContext();
        context.getSession().put(LAST_ACTION_ERROR_ATTRIBUTE, actionError);
    }

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    /*
     * @see org.apache.empire.struts2.action.ActionErrorProvider#getLastActionMessage(boolean)
     */
    public String getLastActionMessage(boolean clear)
    {
        ActionContext context = ActionContext.getContext();
        Object msg = context.getSession().get(LAST_ACTION_MESSAGE_ATTRIBUTE);
        if (clear)
            context.getSession().remove(LAST_ACTION_MESSAGE_ATTRIBUTE);
        return StringUtils.toString(msg);
    }

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    protected void setActionMessage(String message)
    {   // put Message on session
        if (message.startsWith("!"))
            message = getText(message.substring(1));
        ActionContext context = ActionContext.getContext();
        context.getSession().put(LAST_ACTION_MESSAGE_ATTRIBUTE, message);
    }

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    // ------- Request Param accessors -------
    
    public final Map getRequestParameters()
    {
        ActionContext context = ActionContext.getContext();
        return (context!=null) ? context.getParameters() : null;
    }

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    }
    
    protected Object getActionObject(String name)
    {
        // Get the object key
        ActionContext context = ActionContext.getContext();
        String key = getActionObjectName(context, name);
        if (key==null)
            return null;
        // Get the object from the session
        return context.getSession().get(key);
    }

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