DisplayChartServlet.java

/**
 * The contents of this file are subject to the OpenMRS Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://license.openmrs.org
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */
package org.openmrs.web.servlet;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jfree.chart.JFreeChart;

/**
 * Servlet for rendering a 3D piechart of categories and values width: Width of the generated image
 * height: Height of the generated image mimeType: Accepts either image/png or image/jpeg
 * chartTitle: The title of the graph
 */
public class DisplayChartServlet extends AbstractGraphServlet {
	
	public static final long serialVersionUID = 1231232L;
	
	private Log log = LogFactory.getLog(DisplayChartServlet.class);
	
	public static final String SERVLET_NAME = "displayChartServlet";
	
	public static final String CHART_KEY = "chartKey";
	
	protected JFreeChart createChart(HttpServletRequest request, HttpServletResponse response) {
		
		String key = request.getParameter(CHART_KEY);
		
		HttpSession session = request.getSession();
		Object o = session.getAttribute(key);
		
		if (o == null)
			log.error("Unable to find chart in session with key: " + key);
		
		return (JFreeChart) o;
		
	}
}