view flys-artifacts/src/main/java/de/intevation/flys/artifacts/services/MapInfoService.java @ 4655:cd44d28d0fbc

Move the access to artifact data to the Access object Use BedHeightAccess class to receive the data from the artifact. This abstracts the data access from the actual artifact.
author Björn Ricks <bjoern.ricks@intevation.de>
date Tue, 11 Dec 2012 09:44:04 +0100
parents 8e66293c5369
children 6aa1b8abe2d3
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package de.intevation.flys.artifacts.services;

import org.apache.log4j.Logger;

import java.util.Map;
import java.util.HashMap;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.Element;

import javax.xml.xpath.XPathConstants;

import com.vividsolutions.jts.geom.Envelope;

import de.intevation.artifacts.CallMeta;
import de.intevation.artifacts.GlobalContext;

import de.intevation.artifacts.common.ArtifactNamespaceContext;
import de.intevation.artifacts.common.utils.Config;
import de.intevation.artifacts.common.utils.XMLUtils;
import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;

import de.intevation.artifactdatabase.XMLService;

import de.intevation.flys.utils.GeometryUtils;

/**
 * This service provides information about the supported rivers by this
 * application.
 *
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class MapInfoService extends XMLService {

    /** XPath that points to the river.*/
    public static final String XPATH_RIVER = "/mapinfo/river/text()";

    public static final String XPATH_RIVER_PROJECTION =
        "/artifact-database/floodmap/river[@name=$river]/srid/@value";

    public static final String XPATH_RIVER_BACKGROUND =
        "/artifact-database/floodmap/river[@name=$river]/background-wms";

    public static final String XPATH_RIVER_WMS =
        "/artifact-database/floodmap/river[@name=$river]/river-wms/@url";


    /** The logger used in this service.*/
    private static Logger logger = Logger.getLogger(MapInfoService.class);


    /**
     * The default constructor.
     */
    public MapInfoService() {
    }

    protected static String getStringXPath(
        String              query,
        Map<String, String> variables
    ) {
        return (String)XMLUtils.xpath(
            Config.getConfig(), query, XPathConstants.STRING,
            null, variables);
    }

    protected static Node getNodeXPath(
        String              query,
        Map<String, String> variables
    ) {
        return (Node)XMLUtils.xpath(
            Config.getConfig(), query, XPathConstants.NODE,
            null, variables);
    }

    @Override
    public Document processXML(
        Document      data,
        GlobalContext globalContext,
        CallMeta      callMeta
    ) {
        logger.debug("MapInfoService.process");

        Document result   = XMLUtils.newDocument();
        ElementCreator cr = new ElementCreator(result, null, null);

        Element mapinfo = cr.create("mapinfo");
        result.appendChild(mapinfo);

        String river = extractRiver(data);
        if (river == null || river.length() == 0) {
            logger.warn("Cannot generate information: river is empty!");
            return result;
        }

        Element root = cr.create("river");
        cr.addAttr(root, "name", river);
        mapinfo.appendChild(root);

        Envelope env = GeometryUtils.getRiverBoundary(river);
        if (env != null) {
            String bounds = GeometryUtils.jtsBoundsToOLBounds(env);
            logger.debug("River '" + river + "' bounds: " + bounds);

            Element bbox = cr.create("bbox");
            cr.addAttr(bbox, "value", bounds);
            root.appendChild(bbox);
        }

        Map<String, String> vars = new HashMap<String, String>();
        vars.put("river", river);

        String sridStr = getStringXPath(XPATH_RIVER_PROJECTION, vars);

        if (sridStr != null && sridStr.length() > 0) {
            Element srid = cr.create("srid");
            cr.addAttr(srid, "value", sridStr);
            root.appendChild(srid);
        }

        Element back = (Element)getNodeXPath(XPATH_RIVER_BACKGROUND, vars);
        if (back != null) {
            Element background = cr.create("background-wms");
            cr.addAttr(background, "url", back.getAttribute("url"));
            cr.addAttr(background, "layers", back.getAttribute("layers"));
            root.appendChild(background);
        }

        String wmsStr = getStringXPath(XPATH_RIVER_WMS, vars);
        if (wmsStr != null && wmsStr.length() > 0) {
            Element wms = cr.create("river-wms");
            cr.addAttr(wms, "url", wmsStr);
            root.appendChild(wms);
        }

        return result;
    }


    protected String extractRiver(Document data) {
        return XMLUtils.xpathString(
            data, XPATH_RIVER, ArtifactNamespaceContext.INSTANCE);
    }
}
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