package com.aver.web;

import static java.lang.System.out;

import java.lang.reflect.Field;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import com.aver.web.annotation.InjectService;
import com.opensymphony.xwork.ActionInvocation;
import com.opensymphony.xwork.interceptor.AroundInterceptor;

public class ServiceInjector extends AroundInterceptor
{
    protected void after(ActionInvocation arg0, String arg1) throws Exception
    {
    }

    protected void before(ActionInvocation invocation) throws Exception
    {
        Object action = invocation.getAction();
        Class clazz = action.getClass();
        out.println(action.getClass().getName());
        for (Field field : clazz.getDeclaredFields())
        {
            out.println(">>> " + field.getName());
            if (field.isAnnotationPresent(InjectService.class))
            {
                out.println("FIELD " + field.getName() + " IS ANNOTATED WITH @InjectService -> "
                        + field.getType().getSimpleName());
                field.set(action, getService("myapp/" + field.getType().getSimpleName() + "Bean/local"));
            }
        }

    }

    private Object getService(String serviceJndiName)
    {
        Context ctx;
        try
        {
            ctx = new InitialContext();
            return ctx.lookup(serviceJndiName);
        }
        catch (NamingException e)
        {
            e.printStackTrace();
        }
        return null;
    }
}