/*
* Copyright 2008-2009 the original 赵永春(zyc@hasor.net).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.hasor.mvc.web.support;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import net.hasor.core.AppContext;
import net.hasor.mvc.support.MappingDefine;
import net.hasor.mvc.support.RootController;
import net.hasor.web.startup.RuntimeListener;
/**
* action功能的入口。
* @version : 2013-5-11
* @author 赵永春 (zyc@hasor.net)
*/
class ControllerFilter implements Filter {
private RootController rootController = null;
//
public void init(FilterConfig filterConfig) throws ServletException {
AppContext appContext = RuntimeListener.getLocalAppContext();
this.rootController = appContext.getInstance(RootController.class);
if (this.rootController == null) {
throw new NullPointerException("RootController is null.");
}
}
public void destroy() {}
//
//
//
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
String actionPath = request.getRequestURI().substring(request.getContextPath().length());
//1.获取 ActionInvoke
MappingDefine define = this.rootController.findMapping(new WebFindMapping(actionPath, request.getMethod()));
if (define == null) {
chain.doFilter(request, resp);
return;
}
//2.执行调用
this.doInvoke(define, request, resp);
}
private void doInvoke(MappingDefine define, ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
try {
HttpServletRequest httpReq = (HttpServletRequest) servletRequest;
//
httpReq = new HttpServletRequestWrapper(httpReq) {
public RequestDispatcher getRequestDispatcher(final String path) {
final RequestDispatcher dispatcher = getReqDispatcher(path, this);
return null != dispatcher ? dispatcher : super.getRequestDispatcher(path);
}
};
//
define.invoke(new WebCallStrategy(httpReq, (HttpServletResponse) servletResponse), null);
//
} catch (Throwable target) {
//
if (target instanceof ServletException)
throw (ServletException) target;
if (target instanceof IOException)
throw (ServletException) target;
if (target instanceof RuntimeException)
throw (RuntimeException) target;
throw new ServletException(target);
}
}
//
//
/** 为转发提供支持 */
public RequestDispatcher getReqDispatcher(final String newRequestUri, final HttpServletRequest request) {
// TODO 需要检查下面代码是否符合Servlet规范（带request参数情况下也需要检查）
//1.拆分请求字符串
final MappingDefine define = this.rootController.findMapping(new WebFindMapping(newRequestUri, request.getMethod()));
if (define == null)
return null;
//
return new RequestDispatcher() {
public void include(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
servletRequest.setAttribute(REQUEST_DISPATCHER_REQUEST, Boolean.TRUE);
/*执行servlet*/
try {
doInvoke(define, servletRequest, servletResponse);
} finally {
servletRequest.removeAttribute(REQUEST_DISPATCHER_REQUEST);
}
}
public void forward(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
if (servletResponse.isCommitted() == true)
throw new ServletException("Response has been committed--you can only call forward before committing the response (hint: don't flush buffers)");
/*清空缓冲*/
servletResponse.resetBuffer();
ServletRequest requestToProcess;
if (servletRequest instanceof HttpServletRequest) {
requestToProcess = new RequestDispatcherRequestWrapper(servletRequest, newRequestUri);
} else {
//正常情况之下不会执行这段代码。
requestToProcess = servletRequest;
}
/*执行转发*/
servletRequest.setAttribute(REQUEST_DISPATCHER_REQUEST, Boolean.TRUE);
try {
doInvoke(define, requestToProcess, servletResponse);
} finally {
servletRequest.removeAttribute(REQUEST_DISPATCHER_REQUEST);
}
}
};
}
/** 使用RequestDispatcherRequestWrapper类处理request.getRequestURI方法的返回值*/
public static final String REQUEST_DISPATCHER_REQUEST = "javax.servlet.forward.servlet_path";
private static class RequestDispatcherRequestWrapper extends HttpServletRequestWrapper {
private final String newRequestUri;
public RequestDispatcherRequestWrapper(ServletRequest servletRequest, String newRequestUri) {
super((HttpServletRequest) servletRequest);
this.newRequestUri = newRequestUri;
}
public String getRequestURI() {
return newRequestUri;
}
}
}