package org.jrest4guice.rest.helper;
import java.io.IOException;
import java.lang.reflect.Method;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.jrest4guice.client.ModelMap;
import org.jrest4guice.guice.GuiceContext;
import org.jrest4guice.rest.annotations.Action;
import org.jrest4guice.rest.annotations.Delete;
import org.jrest4guice.rest.annotations.Get;
import org.jrest4guice.rest.annotations.HttpMethodType;
import org.jrest4guice.rest.annotations.MimeType;
import org.jrest4guice.rest.annotations.Post;
import org.jrest4guice.rest.annotations.Put;
import org.jrest4guice.rest.annotations.RESTful;
import org.jrest4guice.rest.commons.cache.ResourceCacheManager;
import org.jrest4guice.rest.exception.Need2RedirectException;
import org.jrest4guice.rest.exception.ServiceNotFoundException;
import org.jrest4guice.rest.reader.RequestContentReader;
import org.jrest4guice.rest.reader.RequestContentReaderRegister;
import org.jrest4guice.rest.writer.JsonResponseWriter;
/**
*
* @author <a href="mailto:zhangyouqun@gmail.com">cnoss (QQ:86895156)</a>
*
*/
@SuppressWarnings("unchecked")
public class JRestGuiceProcessorHelper {
private String charset;
public void setCharset(String charset) {
this.charset = charset;
}
/**
* 从缓存中处理当前请求
* @param request
* @param response
* @param uri
* @return
* @throws IOException
* @throws ServletException
*/
public boolean checkResourceCache(HttpServletRequest request,
HttpServletResponse response, String uri) throws IOException,
ServletException {
String mimeType = RequestHelper.getMimeType(request);
String resourceUrl = ResourceCacheManager.getInstance()
.findStaticCacheResource(uri, mimeType, request);
if (resourceUrl != null) {
// HttpSession session = request.getSession();
// String fName = resourceUrl;
// int index = fName.lastIndexOf("/");
// if (index != -1) {
// fName = fName.substring(index + 1);
// }
// final String key = ResourceCacheProvider.ETAGS_SESSION_KEY + fName;
// Object cached = session.getAttribute(key);
// if (cached != null) {
// System.out.println("not modified：" + resourceUrl);
// response.sendError(HttpServletResponse.SC_NOT_MODIFIED);
// response.setHeader("Last-Modified", request
// .getHeader("If-Modified-Since"));
// } else {
// System.out.println("从缓存中直接重定向：" + resourceUrl);
// session.setAttribute(key, "true");
// Calendar cal = Calendar.getInstance();
// cal.set(Calendar.MILLISECOND, 0);
// Date lastModified = cal.getTime();
// response.setDateHeader("Last-Modified", lastModified.getTime());
response.setContentType(mimeType);
RequestDispatcher rd = request.getSession().getServletContext()
.getRequestDispatcher(resourceUrl);
rd.forward(request, response);
// }
return true;
}
return false;
}
public void writeRestServiceNotFoundMessage(HttpServletRequest request,
String uri) {
String mimeType = RequestHelper.getMimeType(request);
String msg = "没有提供指定的Rest服务 (" + uri + ") ！";
if (MimeType.MIME_OF_TEXT_HTML.equals(mimeType)) {
throw new ServiceNotFoundException(msg);
} else
this.writeErrorMessage(new Exception(msg));
}
public void writeErrorMessage(Exception e) {
try {
GuiceContext.getInstance().getBean(JsonResponseWriter.class)
.writeResult(null, null, e,charset, null);
} catch (Need2RedirectException e1) {
}
}
public HttpMethodType getHttpMethodType(String method) {
if (RESTful.METHOD_OF_GET.equalsIgnoreCase(method))
return HttpMethodType.GET;
else if (RESTful.METHOD_OF_POST.equalsIgnoreCase(method))
return HttpMethodType.POST;
else if (RESTful.METHOD_OF_PUT.equalsIgnoreCase(method))
return HttpMethodType.PUT;
else if (RESTful.METHOD_OF_DELETE.equalsIgnoreCase(method))
return HttpMethodType.DELETE;
return null;
}
public static HttpMethodType getHttpMethodType(Method m) {
String methodName = m.getName();
HttpMethodType type = null;
if (m.isAnnotationPresent(Get.class)) {
type = HttpMethodType.GET;
} else if (m.isAnnotationPresent(Post.class)) {
type = HttpMethodType.POST;
} else if (m.isAnnotationPresent(Put.class)) {
type = HttpMethodType.PUT;
} else if (m.isAnnotationPresent(Delete.class)) {
type = HttpMethodType.DELETE;
} else if (m.isAnnotationPresent(Action.class)) {
type = HttpMethodType.ACTION;
} else {
if (methodName.startsWith(RESTful.METHOD_OF_GET)) {
type = HttpMethodType.GET;
} else if (methodName.startsWith(RESTful.METHOD_OF_POST)) {
type = HttpMethodType.POST;
} else if (methodName.startsWith(RESTful.METHOD_OF_PUT)) {
type = HttpMethodType.PUT;
} else if (methodName.startsWith(RESTful.METHOD_OF_DELETE)) {
type = HttpMethodType.DELETE;
}
}
return type;
}
/**
* 填充参数
*
* @modelMap request
* @modelMap params
*/
public void fillParameters(HttpServletRequest request, ModelMap params) {
RequestContentReader reader = RequestContentReaderRegister.getInstance().getRequestReader(RequestHelper.getContentType(request));
if(reader != null)
reader.readData(request, params, charset);
}
}