Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/ChartInfoServiceImpl.java @ 1577:322f2626fb5d
Create a better label in IntegerRangeData for the selected item.
flys-client/trunk@3843 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author | Ingo Weinzierl <ingo.weinzierl@intevation.de> |
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date | Tue, 31 Jan 2012 15:42:02 +0000 |
parents | bc06a671ef60 |
children | 8bbaa0d173cf |
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package de.intevation.flys.client.server; import java.io.InputStream; import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.Map; import javax.xml.xpath.XPathConstants; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.apache.log4j.Logger; 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.Axis; import de.intevation.flys.client.shared.model.ChartInfo; 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 { private static final Logger logger = Logger.getLogger(ChartInfoServiceImpl.class); public static final String XPATH_TRANSFORM_MATRIX = "/art:chartinfo/art:transformation-matrix/art:matrix"; public static final String XPATH_X_AXES = "/art:chartinfo/art:axes/art:domain"; public static final String XPATH_Y_AXES = "/art:chartinfo/art:axes/art:range"; public static final String EXCEPTION_STRING = "error_chart_info_service"; public ChartInfo getChartInfo( Collection collection, String locale, String type, Map<String, String> attr) throws ServerException { logger.info("ChartInfoServiceImpl.getChartInfo"); String url = getServletContext().getInitParameter("server-url"); 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) { ioe.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } logger.debug("Error while fetching chart info."); throw new ServerException(EXCEPTION_STRING); } protected ChartInfo parseInfoDocument(Document doc) { Transform2D[] transformer = parseTransformationMatrix(doc); Axis[] xAxes = parseXAxes(doc); Axis[] yAxes = parseYAxes(doc); return new ChartInfo(xAxes, yAxes, transformer); } protected Axis[] parseXAxes(Document doc) { logger.debug("ChartInfoServiceImpl.parseXAxes"); NodeList axes = (NodeList) XMLUtils.xpath( doc, XPATH_X_AXES, XPathConstants.NODESET, ArtifactNamespaceContext.INSTANCE); return parseAxes(axes); } protected Axis[] parseYAxes(Document doc) { logger.debug("ChartInfoServiceImpl.parseYAxes"); NodeList axes = (NodeList) XMLUtils.xpath( doc, XPATH_Y_AXES, XPathConstants.NODESET, ArtifactNamespaceContext.INSTANCE); return parseAxes(axes); } protected Axis[] parseAxes(NodeList axes) { logger.debug("ChartInfoServiceImpl.parseAxes"); int count = axes != null ? axes.getLength() : 0; logger.debug("Chart has " + count + " axes."); if (count == 0) { return null; } Axis[] result = new Axis[count]; for (int i = 0; i < count; i++) { Node node = axes.item(i); String posStr = XMLUtils.xpathString( node, "@art:pos", ArtifactNamespaceContext.INSTANCE); String fromStr = XMLUtils.xpathString( node, "@art:from", ArtifactNamespaceContext.INSTANCE); String toStr = XMLUtils.xpathString( node, "@art:to", ArtifactNamespaceContext.INSTANCE); String minStr = XMLUtils.xpathString( node, "@art:min", ArtifactNamespaceContext.INSTANCE); String maxStr = XMLUtils.xpathString( node, "@art:max", ArtifactNamespaceContext.INSTANCE); try { int pos = Integer.parseInt(posStr); double from = Double.parseDouble(fromStr); double to = Double.parseDouble(toStr); double min = Double.parseDouble(minStr); double max = Double.parseDouble(maxStr); if (pos >= result.length) { // this should never happen logger.debug("The axis is out of valid range: " + pos); continue; } result[pos] = new Axis(pos, from, to, min, max); } catch (NumberFormatException nfe) { nfe.printStackTrace(); } } logger.debug("Parsed " + result.length + " axes"); return result; } /** * 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[] parseTransformationMatrix(Document doc) { logger.debug("ChartInfoServiceImpl.parseTransformationMatrix"); NodeList matrix = (NodeList) XMLUtils.xpath( doc, XPATH_TRANSFORM_MATRIX, XPathConstants.NODESET, ArtifactNamespaceContext.INSTANCE); int num = matrix != null ? matrix.getLength() : 0; List<Transform2D> transformer = new ArrayList<Transform2D>(num); for (int i = 0; i < num; i++) { Transform2D t = createTransformer(matrix.item(i)); if (t == null) { logger.warn("Broken transformation matrix at pos: " + i); continue; } transformer.add(t); } return (Transform2D[]) transformer.toArray(new Transform2D[num]); } protected Transform2D createTransformer(Node matrix) { 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) { logger.warn("Error while parsing matrix values."); } } logger.warn("No matrix values found."); return new Transform2D(1d, 1d, 0d, 0d); } } // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :