DefaultParamAdvisor.java :  » MVC » nestframework » org » nestframework » core » Java Open Source

/**
 * 
 */
package org.nestframework.core;

import java.io.IOException;
import java.io.PrintWriter;
import java.lang.annotation.Annotation;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import ognl.Ognl;

import org.nestframework.action.ActionException;
import org.nestframework.annotation.WebParam;
import org.nestframework.localization.ActionMessages;
import org.nestframework.utils.NestUtil;
import org.nestframework.utils.RequestParamMapTypeConverter;

/**
 * @author audin
 *
 */
public class DefaultParamAdvisor implements IParamAdvisor {

  /* (non-Javadoc)
   * @see org.nestframework.core.IParamAdvisor#parseParam(java.lang.Class, org.nestframework.core.ExecuteContext)
   */
  public Object parseParam(Class<?> clazz, Annotation[] annotation, ExecuteContext ctx) throws ActionException {
    Object rt = null;
    if (clazz.equals(HttpServletRequest.class)) {
      rt = ctx.getRequest();
    } else if (clazz.equals(HttpServletResponse.class)) {
      rt = ctx.getResponse();
    } else if (clazz.equals(HttpSession.class)) {
      rt = ctx.getRequest().getSession(true);
    } else if (clazz.equals(BeanContext.class)) {
      rt = ctx.getBeanContext();
    } else if (clazz.equals(IExternalContext.class)) {
      rt = ctx.getConfig().getExternalContext();
    } else if (clazz.equals(ActionMessages.class)) {
      rt = ctx.getActionErrors();
    } else if (clazz.equals(PrintWriter.class)) {
      try {
        rt = ctx.getResponse().getWriter();
      } catch (IOException e) {
        throw new ActionException("Can't get PrintWriter from request.", e);
      }
    } else if (clazz.equals(ExecuteContext.class)) {
      rt = ctx;
    } else {
      if (annotation != null) {
        for (Annotation an: annotation) {
          if (an.annotationType().isAssignableFrom(WebParam.class)) {
            WebParam param = (WebParam)an;
            String pn = param.name();
            if (NestUtil.isNotEmpty(pn)) {
              String[] value = ctx.getParams().get(pn);
              Map<?, ?> ognlContext = Ognl.createDefaultContext(null);
              RequestParamMapTypeConverter converter = new RequestParamMapTypeConverter();
              rt = converter.convertValue(ognlContext, value, clazz);
              break;
            }
          }
        }
      }
    }
    return rt;
  }

}