CODEWITHSUNDEEP
struts2annotations
Alireza Fattahi
Alireza Fattahi

Reputation: 45475

Struts 2 get custom action anotation in interceptors

Consider below action class with three action mappings. Two of them are annotated with a custom annotation @AjaxAction

public class MyAction extends ActionSupport{

  @Action("action1")
  @AjaxAction  //My custom anotation
  public String action1(){    
  }    

  @Action("action2")
   public String action2(){    
    }

  @Action("action3")
  @AjaxAction  //My custom anotation
  public String action3(){    
  }    
}

In an interceptor I want to access the @AjaxAction annotation. Is there any built in support for this?!

If not can I shall read the action name with ActionContext.getContext().getName(); and save a list of ajaxAction names in interceptor as an array and compare action name with this array! any better way?!

private static final String[] AJAX_ACTIONS = new String[] {"action1", "action3"}

//in interceptor
String actionName = ActionContext.getContext().getName();
if (Arrays.asList(AJAX_ACTIONS).contains(actionName)) {
           // do something
        }

Upvotes: 1

Views: 742

Answers (1)

prem30488
prem30488

Reputation: 2856

Here is the way

import java.lang.reflect.Method;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class YourInterceptor implements Interceptor {
@Override
public String intercept(ActionInvocation inv) throws Exception {

Class myActionClass = inv.getAction().getClass(); 
    for (Method method : myActionClass.getMethods()) 
    {
        if(method.isAnnotationPresent(AjaxAction.class)) 
        {
            // do something
        }
    }
  return inv.invoke();
  }
  }

Alternative is

import com.opensymphony.xwork2.util.AnnotationUtils;
import java.lang.reflect.Method;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class YourInterceptor implements Interceptor {
@Override
public String intercept(ActionInvocation inv) throws Exception {
 AnnotationUtils myutil = new AnnotationUtils();
    Class myActionClass = inv.getAction().getClass(); 
    for (Method method : myActionClass.getMethods()) 
    {
        if(myutil.getAnnotatedMethods(myActionClass, AjaxAction.class).contains(method))
        {
            // do something
        }
    }
  return inv.invoke();
  }
 }

Edit :

To find exact executed method.

Note: Change Namespace="/" as per your configuration in struts.xml.

import org.apache.struts2.dispatcher.Dispatcher;

ActionContext context = inv.getInvocationContext();
String executedAction=context.getName();

String executedMethod=Dispatcher.getInstance().getConfigurationManager().getConfiguration().getRuntimeConfiguration().getActionConfigs().get("/").get(executedAction).getMethodName();
    if(executedMethod==null)
    {
        executedMethod="execute";
    }

for (Method method : myActionClass.getMethods()) 
    {
        if(method.getName().equalsIgnoreCase(executedMethod) || method.isAnnotationPresent(Action.class)) 
        {
            // do something
        }
    }
Class myActionClass = inv.getAction().getClass();
for (Method method : myActionClass.getMethods()) 
{
     //check whether called method has annotation?
     if(method.getName().equalsIgnoreCase(executedAction) && method.isAnnotationPresent(AjaxAction.class)) 
     {
            // do something
     }
 }

I hope this will work.

Note: This is just a workaround I found. Better way would be possible....

Upvotes: 1

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