ingo@78: package de.intevation.flys.client.server;
ingo@78: 
ingo@78: import java.io.OutputStream;
ingo@78: import java.io.IOException;
ingo@78: 
ingo@78: import org.w3c.dom.Document;
ingo@280: import org.w3c.dom.Element;
ingo@78: 
ingo@78: import javax.servlet.http.HttpServlet;
ingo@78: import javax.servlet.http.HttpServletRequest;
ingo@78: import javax.servlet.http.HttpServletResponse;
ingo@78: 
ingo@280: import de.intevation.artifacts.common.ArtifactNamespaceContext;
ingo@213: import de.intevation.artifacts.common.utils.ClientProtocolUtils;
ingo@280: import de.intevation.artifacts.common.utils.XMLUtils;
ingo@280: import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
ingo@213: 
ingo@78: import de.intevation.artifacts.httpclient.http.HttpClient;
ingo@78: import de.intevation.artifacts.httpclient.http.HttpClientImpl;
ingo@78: 
ingo@78: 
ingo@78: /**
ingo@78:  * This service is used to request a chart from the artifact server. The
ingo@78:  * response is directed directly to the output stream, so the image that is
ingo@78:  * retrieved is displayed in the UI afterwards.
ingo@78:  *
ingo@78:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@78:  */
ingo@78: public class ChartOutputServiceImpl
ingo@78: extends      HttpServlet
ingo@78: {
ingo@280:     /** The default chart width if no value is specified in the request.*/
ingo@280:     public static final int DEFAULT_CHART_WIDTH  = 600;
ingo@280: 
ingo@280:     /** The default chart height if no value is specified in the request.*/
ingo@280:     public static final int DEFAULT_CHART_HEIGHT = 400;
ingo@280: 
ingo@280: 
ingo@78:     public void doGet(HttpServletRequest req, HttpServletResponse resp) {
ingo@78:         System.out.println("ChartOutputServiceImpl.doGet");
ingo@78: 
ingo@78:         try {
ingo@78:             OutputStream out = resp.getOutputStream();
ingo@78: 
ingo@78:             String serverUrl = req.getParameter("server");
ingo@78:             String uuid      = req.getParameter("uuid");
ingo@213:             String type      = req.getParameter("type");
ingo@254:             String locale    = req.getParameter("locale");
ingo@78: 
ingo@213:             Document request = ClientProtocolUtils.newOutCollectionDocument(
ingo@432:                 uuid, type, type, getChartAttributes(req));
ingo@78: 
ingo@254:             HttpClient client = new HttpClientImpl(serverUrl, locale);
ingo@213:             client.collectionOut(request, uuid, "chart", out);
ingo@78: 
ingo@78:             out.close();
ingo@78:             out.flush();
ingo@78:         }
ingo@78:         catch (IOException ioe) {
ingo@78:             System.err.println(ioe.getMessage());
ingo@78:         }
ingo@280:         catch (Exception e) {
ingo@280:             System.err.println(e.getMessage());
ingo@280:         }
ingo@280:     }
ingo@280: 
ingo@280: 
ingo@280:     /**
ingo@280:      * This method returns a document which might contain parameters to adjust
ingo@280:      * chart settings. The document is created using the information that are
ingo@280:      * contained in the request object.
ingo@280:      *
ingo@280:      * @param req The request document.
ingo@280:      *
ingo@280:      * @return a document to adjust chart settings.
ingo@280:      */
ingo@280:     protected Document getChartAttributes(HttpServletRequest req) {
ingo@280:         Document doc = XMLUtils.newDocument();
ingo@280: 
ingo@280:         ElementCreator ec = new ElementCreator(
ingo@280:             doc,
ingo@280:             ArtifactNamespaceContext.NAMESPACE_URI,
ingo@280:             ArtifactNamespaceContext.NAMESPACE_PREFIX);
ingo@280: 
ingo@280:         appendChartSize(req, doc, ec);
ingo@280: 
ingo@280:         return doc;
ingo@280:     }
ingo@280: 
ingo@280: 
ingo@280:     /**
ingo@280:      * This method extracts the size (width/height) of a chart from request
ingo@280:      * object and append those values - if they exist - to the attribute
ingo@280:      * document used to adjust chart settings.
ingo@280:      *
ingo@280:      * @param req The request object that might contain the chart size.
ingo@280:      * @param doc The attribute document used to adjust chart settings.
ingo@280:      * @param ec The ElementCreator that might be used to create new Elements.
ingo@280:      */
ingo@280:     protected void appendChartSize(
ingo@280:         HttpServletRequest req,
ingo@280:         Document           doc,
ingo@280:         ElementCreator     ec)
ingo@280:     {
ingo@280:         Element size = ec.create("size");
ingo@280: 
ingo@280:         String width  = req.getParameter("width");
ingo@280:         String height = req.getParameter("height");
ingo@280: 
ingo@280:         if (width == null || height == null) {
ingo@280:             width  = Integer.toString(DEFAULT_CHART_WIDTH);
ingo@280:             height = Integer.toString(DEFAULT_CHART_HEIGHT);
ingo@280:         }
ingo@280: 
ingo@280:         ec.addAttr(size, "width", width, true);
ingo@280:         ec.addAttr(size, "height", height, true);
ingo@280: 
ingo@280:         doc.appendChild(size);
ingo@78:     }
ingo@78: }
ingo@280: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :