view flys-client/src/main/java/de/intevation/flys/client/server/MetaDataServiceImpl.java @ 4241:49cb65d5932d

Improved the historical discharge calculation. The calculation now creates new HistoricalWQKms (new subclass of WQKms). Those WQKms are used to create new facets from (new) type 'HistoricalDischargeCurveFacet'. The chart generator is improved to support those facets.
author Ingo Weinzierl <ingo.weinzierl@intevation.de>
date Wed, 24 Oct 2012 14:34:35 +0200
parents f2039d030b5e
children 2dac0e5b927e
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package de.intevation.flys.client.server;

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

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.XMLUtils;

import de.intevation.flys.client.shared.exceptions.ServerException;

import de.intevation.flys.client.client.services.MetaDataService;

import de.intevation.artifacts.httpclient.exceptions.ConnectionException;

import de.intevation.artifacts.httpclient.http.HttpClient;
import de.intevation.artifacts.httpclient.http.HttpClientImpl;

import de.intevation.flys.client.shared.model.DataCageTree;

import de.intevation.flys.client.server.meta.Converter;

/**
 * Service that returns certain meta-data from the backends data, polished to
 * inclusion into current project.
 */
public class MetaDataServiceImpl
extends      RemoteServiceServlet
implements   MetaDataService
{
    /** Our very own logger. */
    private static final Logger logger =
        Logger.getLogger(MetaDataServiceImpl.class);

    public static final String ERROR_NO_META_DATA_FOUND =
        "error_no_meta_data_found";


    /**
     * @param locale needed for i18n.
     * @param artifactId ID of masterartifact (can be null)
     * @param userId can be null
     * @param outs can be null
     * @param parameters can be null
     */
    @Override
    public DataCageTree getMetaData(
        String locale,
        String artifactId,
        String userId,
        String outs,
        String parameters
    ) throws ServerException
    {
        logger.info("MetaDataService.getMetaData");

        // Create the query document.
        String url = getServletContext().getInitParameter("server-url");

        Document doc = XMLUtils.newDocument();

        XMLUtils.ElementCreator ec = new XMLUtils.ElementCreator(
            doc,
            ArtifactNamespaceContext.NAMESPACE_URI,
            ArtifactNamespaceContext.NAMESPACE_PREFIX);

        Element meta = ec.create("meta");

        if (artifactId != null) {
            Element artifactEl = ec.create("artifact-id");
            artifactEl.setAttribute("value", artifactId);
            meta.appendChild(artifactEl);
        }

        if (userId != null) {
            Element userEl = ec.create("user-id");
            userEl.setAttribute("value", userId);
            meta.appendChild(userEl);
        }

        if (outs != null) {
            Element outsEl = ec.create("outs");
            outsEl.setAttribute("value", outs);
            meta.appendChild(outsEl);
        }

        if (parameters != null) {
            Element paramsEl = ec.create("parameters");
            paramsEl.setAttribute("value", parameters);
            meta.appendChild(paramsEl);
        }

        doc.appendChild(meta);

        // Fire.
        HttpClient client = new HttpClientImpl(url, locale);

        try {
            Converter converter = new Converter();
            return converter.convert(client.callService(url, "metadata", doc));
        }
        catch (ConnectionException ce) {
            ce.printStackTrace();
        }

        throw new ServerException(ERROR_NO_META_DATA_FOUND);
    }
}
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