package anni.tools;

import java.lang.reflect.Method;

import javax.servlet.http.HttpServletRequest;


/**
 * 功能跟struts的DispathAction差不多吧?
 * 使用反射自動轉發請求
 *
 * @author Lingo
 * @version 1.0
 * @since 2006-01-01 19:41
 */
public class ServiceSupport implements Service {
    /**
     * 類.
     */
    private Class clazz;

    /**
     * 參數類型.
     */
    private Class[] paramTypes;

    /**
     * 參數數組.
     */
    private Object[] params;

    /**
     * 構造方法.
     * 初始化反射需要的參數
     *
     * @author Lingo
     * @since 2006-01-01 19:41
     */
    public ServiceSupport() {
        clazz = this.getClass();
        paramTypes = new Class[] {HttpServletRequest.class};
    }

    /**
     * 修改了請求轉發的主方法.
     * 這里采用了反射，以后就不用再進行手工添加了。
     *
     * @author Lingo
     * @since 2005-12-25 17:07
     * @param request 請求
     * @return String 跳轉的URL
     */
    public final String service(final HttpServletRequest request) {
        String action = request.getParameter("action");

        try {
            /*
             * Log.info(clazz);
             * Method[] m=clazz.getDeclaredMethods();
             * Log.info(Arrays.asList(m));
             */
            Method method = clazz.getDeclaredMethod(action, paramTypes);
            /*
             * Log.info(method);
             */
            params = new Object[] {request};

            Object result = method.invoke(this, params);

            return result.toString();
        } catch (Throwable ex) {
            /*
             * Log.info("error : "+ex.getMessage());
             */
            System.out.println("找不到請求的對應方法 : " + action);

            return "/";
        }
    }
}