com.hmsinc.epicenter.webapp.map.MapStylingController.java Source code

Introduction

Here is the source code for com.hmsinc.epicenter.webapp.map.MapStylingController.java

Source

/**
 * Copyright (C) 2008 University of Pittsburgh
 * 
 * 
 * This file is part of Open EpiCenter
 * 
 *     Open EpiCenter is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * 
 *     Open EpiCenter is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 * 
 *     You should have received a copy of the GNU General Public License
 *     along with Open EpiCenter.  If not, see <http://www.gnu.org/licenses/>.
 * 
 * 
 *   
 */
package com.hmsinc.epicenter.webapp.map;

import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Properties;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.lang.Validate;
import org.joda.time.DateTime;
import org.springframework.stereotype.Controller;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.ServletRequestDataBinder;
import org.springframework.web.bind.annotation.RequestMapping;

import com.hmsinc.epicenter.model.analysis.AnalysisParameters;
import com.hmsinc.epicenter.spatial.service.SpatialScanService;
import com.hmsinc.epicenter.spatial.util.GoogleProjection;
import com.hmsinc.epicenter.webapp.dto.AnalysisParametersDTO;
import com.hmsinc.epicenter.webapp.remoting.AbstractRemoteService;
import com.hmsinc.epicenter.webapp.util.DateTimePropertyEditor;
import com.hmsinc.epicenter.webapp.util.EncodedPropertiesPropertyEditor;

/**
 * Creates dynamic map styles that are applied by Geoserver to map overlays.
 * Works as an interface between Geoserver and our algorithms.
 * 
 * @author Olek Poplavsky
 * @version $Id: MapStylingController.java 1801 2008-07-02 15:08:37Z steve.kondik $
 */
@Controller
public class MapStylingController extends AbstractRemoteService {

    private static final String SLD_CONTENT_TYPE = "text/xml";

    private static final String PNG_CONTENT_TYPE = "image/png";

    @Resource
    private StyleBuilder styleBuilder;

    @Resource
    private SpatialScanService spatialScanService;

    /*
     * (non-Javadoc)
     * 
     * @see org.springframework.web.HttpRequestHandler#handleRequest(javax.servlet.http.HttpServletRequest,
     *      javax.servlet.http.HttpServletResponse)
     */
    @Transactional(readOnly = true)
    @RequestMapping("/map-style")
    public void handleMapStyleRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        final StyleParameters styleParameters = parse(request);

        response.setContentType(SLD_CONTENT_TYPE);
        response.addHeader("cache-control", "must-revalidate");

        styleBuilder.build(response.getOutputStream(), styleParameters);

    }

    @Transactional(readOnly = true)
    @RequestMapping("/spatial-scan")
    public void handleSpatialScanRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        final StyleParameters styleParameters = parse(request);

        response.setContentType(PNG_CONTENT_TYPE);
        response.addHeader("cache-control", "must-revalidate");

        final BufferedImage image = spatialScanService.scan(styleParameters.getParameters(),
                styleParameters.getGeographyClass(), GoogleProjection.GOOGLE_MERCATOR, 800, 600, false, false)
                .getImage();
        if (image == null) {
            logger.debug("No image to render: {}", styleParameters);
        } else {
            ImageIO.write(image, "png", response.getOutputStream());
        }
    }

    /**
     * @param request
     * @return
     * @throws ServletException
     * @throws IOException
     */
    private StyleParameters parse(HttpServletRequest request) throws ServletException, IOException {

        final AnalysisParametersDTO queryParams = new AnalysisParametersDTO();

        final ServletRequestDataBinder binder = new ServletRequestDataBinder(queryParams);
        binder.registerCustomEditor(DateTime.class, new DateTimePropertyEditor());
        binder.registerCustomEditor(Properties.class, new EncodedPropertiesPropertyEditor());

        binder.bind(request);
        Validate.notNull(queryParams, "No parameters were specified");

        final AnalysisParameters params = convertParameters(queryParams);
        Validate.notNull(params);

        final StyleParameters styleParameters = new StyleParameters(request, params, queryParams, getPrincipal());
        logger.trace("Parameters: {}", styleParameters);

        return styleParameters;
    }
}