/**
* 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.ambari.view.weather;
import org.apache.ambari.view.ResourceProvider;
import org.apache.ambari.view.ViewContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.util.Collections;
import java.util.Map;
/**
* Servlet class for Weather view UI.
*/
public class WeatherServlet extends HttpServlet {
/**
* The view context.
*/
private ViewContext viewContext;
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
ServletContext context = config.getServletContext();
viewContext = (ViewContext) context.getAttribute(ViewContext.CONTEXT_ATTRIBUTE);
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException
{
response.setContentType("text/html");
response.setStatus(HttpServletResponse.SC_OK);
PrintWriter writer = response.getWriter();
writer.println("<h1>" + viewContext.getInstanceName() + " Weather</h1>");
String targetCity = request.getParameter("city");
if (targetCity == null) {
Map<String, String> properties = viewContext.getProperties();
String cityStr = properties.get("cities");
String[] cities = cityStr.split(";");
writer.println("<ul>");
for (String city : cities) {
writer.println("<li><A href=" + request.getRequestURI() + "?city=" + URLEncoder.encode(city, "UTF-8") + ">" + city + "</A></li>");
}
writer.println("</ul>");
} else {
// Use the view's resource provider...
ResourceProvider resourceProvider = viewContext.getResourceProvider("city");
if (resourceProvider != null) {
writer.println("<b>" + targetCity + "</b><br><br>");
CityResource resource;
try {
resource = (CityResource) resourceProvider.getResource(targetCity, Collections.singleton("weather"));
} catch (Exception e) {
throw new IOException(e);
}
String icon_src = (String) resource.getWeather().get("icon_src");
Map<String, Object> weather = (Map<String, Object>) resource.getWeather().get("weather");
Map<String, Object> main = (Map<String, Object>) resource.getWeather().get("main");
writer.println("<b>" +
weather.get("main") + ":" +
weather.get("description") +
"</b><br><IMG SRC=\"" +
icon_src +
"\" ALT=\"Weather\">");
writer.println("<table border=\"1\">");
writer.println("<tr><td>");
writer.println("Temp");
writer.println("</td><td>");
writer.println(main.get("temp"));
writer.println("</td></tr>");
writer.println("<tr><td>");
writer.println("High");
writer.println("</td><td>");
writer.println(main.get("temp_max"));
writer.println("</td></tr>");
writer.println("<tr><td>");
writer.println("Low");
writer.println("</td><td>");
writer.println(main.get("temp_min"));
writer.println("</td></tr>");
writer.println("<tr><td>");
writer.println("Humidity");
writer.println("</td><td>");
writer.println(main.get("humidity"));
writer.println("</td></tr>");
writer.println("</table>");
}
}
}
}