Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 551:13c7f90917fc
Added a PanControl to pan charts.
flys-client/trunk@2064 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 07 Jun 2011 13:07:27 +0000 |
parents | e74bf6bfeeb6 |
children | 6050d49eaba3 |
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package de.intevation.flys.client.server; import java.io.InputStream; import java.io.IOException; import java.util.Map; import javax.xml.xpath.XPathConstants; import org.w3c.dom.Document; import org.w3c.dom.Node; import com.google.gwt.user.server.rpc.RemoteServiceServlet; import de.intevation.artifacts.common.ArtifactNamespaceContext; import de.intevation.artifacts.common.utils.ClientProtocolUtils; import de.intevation.artifacts.common.utils.XMLUtils; import de.intevation.artifacts.httpclient.http.HttpClient; import de.intevation.artifacts.httpclient.http.HttpClientImpl; import de.intevation.flys.client.shared.Transform2D; import de.intevation.flys.client.shared.exceptions.ServerException; import de.intevation.flys.client.shared.model.Collection; import de.intevation.flys.client.client.services.ChartInfoService; /** * This service fetches a document that contains meta information for a specific * chart. * * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a> */ public class ChartInfoServiceImpl extends RemoteServiceServlet implements ChartInfoService { public static final String XPATH_TRANSFORM_MATRIX = "/art:chartinfo/art:transformation-matrix"; public static final String EXCEPTION_STRING = "error_chart_info_service"; public Transform2D getChartInfo( Collection collection, String url, String locale, String type, Map<String, String> attr) throws ServerException { System.out.println("ChartInfoServiceImpl.getChartInfo"); Document request = ClientProtocolUtils.newOutCollectionDocument( collection.identifier(), type, type, ChartServiceHelper.getChartAttributes(attr)); try { HttpClient client = new HttpClientImpl(url, locale); InputStream in = client.collectionOut( request, collection.identifier(), type + "_chartinfo"); Document info = XMLUtils.parseDocument(in); return parseInfoDocument(info); } catch (IOException ioe) { // do nothing } System.err.println("Error while fetching chart info."); throw new ServerException(EXCEPTION_STRING); } /** * Parses the chart info document and extract the Transform2D values. * * @param doc The chart info document. * * @return a Transform2D object to transfrom pixel coordinates into chart * coordinates. */ protected Transform2D parseInfoDocument(Document doc) { System.out.println("ChartInfoServiceImpl.parseInfoDocument"); Node matrix = (Node) XMLUtils.xpath( doc, XPATH_TRANSFORM_MATRIX, XPathConstants.NODE, ArtifactNamespaceContext.INSTANCE); if (matrix == null) { return new Transform2D(1d, 1d, 0d, 0d); } String sx = XMLUtils.xpathString( matrix, "@art:sx", ArtifactNamespaceContext.INSTANCE); String sy = XMLUtils.xpathString( matrix, "@art:sy", ArtifactNamespaceContext.INSTANCE); String tx = XMLUtils.xpathString( matrix, "@art:tx", ArtifactNamespaceContext.INSTANCE); String ty = XMLUtils.xpathString( matrix, "@art:ty", ArtifactNamespaceContext.INSTANCE); if (sx != null && sy != null && tx != null && ty != null) { try { return new Transform2D( Double.parseDouble(sx), Double.parseDouble(sy), Double.parseDouble(tx), Double.parseDouble(ty)); } catch (NumberFormatException nfe) { System.err.println("Error while parsing matrix values."); } } System.err.println("No matrix values found."); return new Transform2D(1d, 1d, 0d, 0d); } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :