Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/ChartOutputServiceImpl.java @ 548:aff225e07720
Repaired broken zoom-out control.
flys-client/trunk@2058 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Mon, 06 Jun 2011 11:56:15 +0000 |
parents | 7c57149e8715 |
children | e74bf6bfeeb6 |
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package de.intevation.flys.client.server; import java.io.OutputStream; import java.io.IOException; import org.w3c.dom.Document; import org.w3c.dom.Element; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import de.intevation.artifacts.common.ArtifactNamespaceContext; import de.intevation.artifacts.common.utils.ClientProtocolUtils; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator; import de.intevation.artifacts.httpclient.http.HttpClient; import de.intevation.artifacts.httpclient.http.HttpClientImpl; /** * This service is used to request a chart from the artifact server. The * response is directed directly to the output stream, so the image that is * retrieved is displayed in the UI afterwards. * * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public class ChartOutputServiceImpl extends HttpServlet { /** The default chart width if no value is specified in the request.*/ public static final int DEFAULT_CHART_WIDTH = 600; /** The default chart height if no value is specified in the request.*/ public static final int DEFAULT_CHART_HEIGHT = 400; public void doGet(HttpServletRequest req, HttpServletResponse resp) { System.out.println("ChartOutputServiceImpl.doGet"); try { OutputStream out = resp.getOutputStream(); String serverUrl = req.getParameter("server"); String uuid = req.getParameter("uuid"); String type = req.getParameter("type"); String locale = req.getParameter("locale"); Document request = ClientProtocolUtils.newOutCollectionDocument( uuid, type, type, getChartAttributes(req)); HttpClient client = new HttpClientImpl(serverUrl, locale); client.collectionOut(request, uuid, "chart", out); out.close(); out.flush(); } catch (IOException ioe) { System.err.println(ioe.getMessage()); } catch (Exception e) { System.err.println(e.getMessage()); } } /** * This method returns a document which might contain parameters to adjust * chart settings. The document is created using the information that are * contained in the request object. * * @param req The request document. * * @return a document to adjust chart settings. */ protected Document getChartAttributes(HttpServletRequest req) { Document doc = XMLUtils.newDocument(); ElementCreator ec = new ElementCreator( doc, ArtifactNamespaceContext.NAMESPACE_URI, ArtifactNamespaceContext.NAMESPACE_PREFIX); Element attributes = ec.create("attributes"); appendChartSize(req, attributes, ec); appendXRange(req, attributes, ec); appendYRange(req, attributes, ec); doc.appendChild(attributes); return doc; } /** * This method extracts the size (width/height) of a chart from request * object and append those values - if they exist - to the attribute * document used to adjust chart settings. * * @param req The request object that might contain the chart size. * @param attributes The attributes element used to adjust chart settings. * @param ec The ElementCreator that might be used to create new Elements. */ protected void appendChartSize( HttpServletRequest req, Element attributes, ElementCreator ec) { Element size = ec.create("size"); String width = req.getParameter("width"); String height = req.getParameter("height"); if (width == null || height == null) { width = Integer.toString(DEFAULT_CHART_WIDTH); height = Integer.toString(DEFAULT_CHART_HEIGHT); } ec.addAttr(size, "width", width, true); ec.addAttr(size, "height", height, true); attributes.appendChild(size); } /** * This method extracts the x range for the chart from request object and * appends those range - if it exists - to the attribute document used to * adjust the chart settings. * * @param req The request object that might contain the chart size. * @param doc The attribute document used to adjust chart settings. * @param ec The ElementCreator that might be used to create new Elements. */ protected void appendXRange( HttpServletRequest req, Element attributes, ElementCreator ec) { Element range = ec.create("xrange"); String from = req.getParameter("minx"); String to = req.getParameter("maxx"); if (from != null && to != null) { ec.addAttr(range, "from", from, true); ec.addAttr(range, "to", to, true); attributes.appendChild(range); } } /** * This method extracts the x range for the chart from request object and * appends those range - if it exists - to the attribute document used to * adjust the chart settings. * * @param req The request object that might contain the chart size. * @param doc The attribute document used to adjust chart settings. * @param ec The ElementCreator that might be used to create new Elements. */ protected void appendYRange( HttpServletRequest req, Element attributes, ElementCreator ec) { Element range = ec.create("yrange"); String from = req.getParameter("miny"); String to = req.getParameter("maxy"); if (from != null && to != null) { ec.addAttr(range, "from", from, true); ec.addAttr(range, "to", to, true); attributes.appendChild(range); } } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :