/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*
* $Header:$
*/
package org.apache.beehive.netui.tags.internal;
import org.apache.beehive.netui.core.chain.Command;
import org.apache.beehive.netui.core.chain.Context;
import org.apache.beehive.netui.core.chain.web.WebChainContext;
import org.apache.beehive.netui.pageflow.PageFlowConstants;
import org.apache.beehive.netui.pageflow.interceptor.InterceptorChain;
import org.apache.beehive.netui.pageflow.interceptor.InterceptorException;
import org.apache.beehive.netui.pageflow.interceptor.request.RequestInterceptorContext;
import org.apache.beehive.netui.pageflow.internal.ViewRenderer;
import org.apache.beehive.netui.tags.AbstractClientRequestInterceptor;
import org.apache.beehive.netui.util.logging.Logger;
import javax.servlet.ServletContext;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* An object to handle a command for rendering framework generated output.
*/
public final class ViewRendererCRI
extends AbstractClientRequestInterceptor
implements Command
{
private static final Logger logger = Logger.getInstance(ViewRendererCRI.class);
public boolean execute(Context context)
throws Exception {
assert context != null;
assert context instanceof WebChainContext;
assert ((WebChainContext)context).getServletRequest() instanceof HttpServletRequest;
assert ((WebChainContext)context).getServletResponse() instanceof HttpServletResponse;
WebChainContext webChainContext = (WebChainContext)context;
HttpServletRequest request = (HttpServletRequest)webChainContext.getServletRequest();
HttpServletResponse response = (HttpServletResponse)webChainContext.getServletResponse();
// Create the command by striping off the context path and the extension
String uri = request.getRequestURI();
String ctxtPath = request.getContextPath();
String cmd = getCommand(uri, ctxtPath);
return handleCommand(request, response, webChainContext.getServletContext(), cmd);
}
public void preRequest(RequestInterceptorContext ctxt, InterceptorChain chain) throws InterceptorException
{
HttpServletRequest request = ctxt.getRequest();
// Create the command by striping off the context path and the extension
String uri = request.getRequestURI();
String ctxtPath = request.getContextPath();
String cmd = getCommand(uri, ctxtPath);
handleCommand(request, ctxt.getResponse(), ctxt.getServletContext(), cmd);
chain.continueChain();
}
public void postRequest(RequestInterceptorContext context, InterceptorChain chain) throws InterceptorException
{
chain.continueChain();
}
private boolean handleCommand(HttpServletRequest request,
HttpServletResponse response,
ServletContext servletContext,
String command) {
if (PageFlowConstants.VIEW_RENDERER_URI_COMMAND.equals(command)) {
handleViewRendering(request, response, servletContext);
return true;
}
else return false;
}
private void handleViewRendering(HttpServletRequest request,
ServletResponse response,
ServletContext servletContext)
{
// get the view renderer from the request attribute
Object obj = request.getAttribute(PageFlowConstants.VIEW_RENDERER_ATTRIBUTE_NAME);
if (obj == null) {
logger.error("ViewRenderer was not found in the request attributes");
return;
}
if (!(obj instanceof ViewRenderer)) {
logger.error("Named view renderer was not an instance of a ViewRenderer");
return;
}
ViewRenderer vr = (ViewRenderer) obj;
// render the response
try {
/*
* Note, this is our own framework response and just javascript
* that calls a javascript routine in another window, passing
* Unicode String values in a map.
* For now, we're setting the content type, but this may be a
* problem for people who whant to control the encoding and the
* content type themselves, as with a JSP.
* If so, then they can implement their own Command to handle the
* ViewRenderer objects.
*/
response.setContentType("text/html; charset=UTF-8");
vr.renderView(request, response, servletContext);
request.removeAttribute(PageFlowConstants.VIEW_RENDERER_ATTRIBUTE_NAME);
}
catch (IOException ioe) {
logger.error("Named view renderer was not able to render. Cause: " + ioe, ioe);
}
}
}