/*
* 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.
*/
package org.apache.sling.servlets.get;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.Servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.ResourceNotFoundException;
import org.apache.sling.api.resource.ResourceUtil;
import org.apache.sling.api.servlets.SlingSafeMethodsServlet;
import org.apache.sling.servlets.get.helpers.HtmlRendererServlet;
import org.apache.sling.servlets.get.helpers.JsonRendererServlet;
import org.apache.sling.servlets.get.helpers.PlainTextRendererServlet;
import org.apache.sling.servlets.get.helpers.StreamRendererServlet;
/**
* A SlingSafeMethodsServlet that renders the current Resource as simple HTML
*
* @scr.component immediate="true" metatype="no"
* @scr.service interface="javax.servlet.Servlet"
*
* @scr.property name="service.description" value="Default GET Servlet"
* @scr.property name="service.vendor" value="The Apache Software Foundation"
*
* Use this as a default servlet for Sling
* @scr.property name="sling.servlet.resourceTypes"
* value="sling/servlet/default"
*
* Generic handler for all get requests
* @scr.property name="sling.servlet.methods" value="GET"
*/
public class DefaultGetServlet extends SlingSafeMethodsServlet {
private static final long serialVersionUID = -5815904221043005085L;
private Map<String, Servlet> rendererMap = new HashMap<String, Servlet>();
private Servlet streamerServlet;
@Override
public void init() throws ServletException {
super.init();
// Register renderer servlets
setupServlet(rendererMap, HtmlRendererServlet.EXT_HTML,
new HtmlRendererServlet());
setupServlet(rendererMap, PlainTextRendererServlet.EXT_TXT,
new PlainTextRendererServlet());
setupServlet(rendererMap, JsonRendererServlet.EXT_JSON,
new JsonRendererServlet());
setupServlet(rendererMap, StreamRendererServlet.EXT_RES,
new StreamRendererServlet());
// use the servlet for rendering StreamRendererServlet.EXT_RES as the
// streamer servlet
streamerServlet = rendererMap.get(StreamRendererServlet.EXT_RES);
}
/**
* @throws ResourceNotFoundException if the resource of the request is a non
* existing resource.
*/
@Override
protected void doGet(SlingHttpServletRequest request,
SlingHttpServletResponse response) throws ServletException,
IOException {
// cannot handle the request for missing resources
if (ResourceUtil.isNonExistingResource(request.getResource())) {
throw new ResourceNotFoundException(
request.getResource().getPath(), "No Resource found");
}
Servlet rendererServlet;
String ext = request.getRequestPathInfo().getExtension();
if (ext == null) {
rendererServlet = streamerServlet;
} else {
rendererServlet = rendererMap.get(ext);
}
// fail if we should not just stream or we cannot support the ext.
if (rendererServlet == null) {
response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
"No renderer for extension='" + ext + "'");
return;
}
request.getRequestProgressTracker().log("Using "
+ rendererServlet.getClass().getName()
+ " to render for extension=" + ext);
rendererServlet.service(request, response);
}
@Override
public void destroy() {
for (Servlet servlet : rendererMap.values()) {
try {
servlet.destroy();
} catch (Throwable t) {
// TODO: log
}
}
streamerServlet = null;
rendererMap.clear();
super.destroy();
}
private void setupServlet(Map<String, Servlet> rendererMap, String key,
Servlet servlet) {
try {
servlet.init(getServletConfig());
rendererMap.put(key, servlet);
} catch (Throwable t) {
// TODO: log
}
}
}