datafeaturetypesnewaction.java

电子地图服务器,搭建自己的地图服务

/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org.  All rights reserved.
 * This code is licensed under the GPL 2.0 license, availible at the root
 * application directory.
 */
package org.vfny.geoserver.action.data;

import org.apache.struts.action.ActionError;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.geotools.data.DataStore;
import org.geotools.data.FeatureSource;
import org.geotools.feature.FeatureType;
import org.opengis.metadata.Identifier;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.vfny.geoserver.action.ConfigAction;
import org.vfny.geoserver.config.DataConfig;
import org.vfny.geoserver.config.DataStoreConfig;
import org.vfny.geoserver.config.FeatureTypeConfig;
import org.vfny.geoserver.form.data.DataFeatureTypesNewForm;
import org.vfny.geoserver.global.UserContainer;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Iterator;
import java.util.Set;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * DataFeatureTypesNewAction purpose.
 *
 * <p>
 * Description of DataFeatureTypesNewAction ...
 * </p>
 *
 * <p>
 * Capabilities:
 * </p>
 *
 * <ul>
 * <li>
 * Feature: description
 * </li>
 * </ul>
 *
 * <p>
 * Example Use:
 * </p>
 * <pre><code>
 * DataFeatureTypesNewAction x = new DataFeatureTypesNewAction(...);
 * </code></pre>
 *
 * @author rgould, Refractions Research, Inc.
 * @author $Author: cholmesny $ (last modification)
 * @version $Id: DataFeatureTypesNewAction.java 7693 2007-11-01 09:31:11Z aaime $
 */
public class DataFeatureTypesNewAction extends ConfigAction {
    public final static String NEW_FEATURE_TYPE_KEY = "newFeatureType";

    public ActionForward execute(ActionMapping mapping, ActionForm incomingForm,
        UserContainer user, HttpServletRequest request, HttpServletResponse response)
        throws IOException {
        DataFeatureTypesNewForm form = (DataFeatureTypesNewForm) incomingForm;
        String selectedNewFeatureType = form.getSelectedNewFeatureType();

        DataConfig dataConfig = (DataConfig) request.getSession().getServletContext()
                                                    .getAttribute(DataConfig.CONFIG_KEY);
        int index = selectedNewFeatureType.indexOf(DataConfig.SEPARATOR);
        String dataStoreID = selectedNewFeatureType.substring(0, index);
        String featureTypeName = selectedNewFeatureType.substring(index
                + DataConfig.SEPARATOR.length());

        DataStoreConfig dsConfig = dataConfig.getDataStore(dataStoreID);
        DataStore dataStore = null;

        FeatureTypeConfig ftConfig;

        //JD: GEOS-399, wrap rest of method in try catch block in order to 
        // report back nicely to app
        try {
            dataStore = dsConfig.findDataStore(request.getSession().getServletContext());
            FeatureType featureType = dataStore.getSchema(featureTypeName);

            ftConfig = new FeatureTypeConfig(dataStoreID, featureType, false);

            // DJB: this comment looks old - SRS support is much better now.  
            //     TODO: delete this comment (but wait a bit)
            // What is the Spatial Reference System for this FeatureType?
            // 
            // getDefaultGeometry().getCoordinateSystem() should help but is null
            // getDefaultGeometry().getGeometryFactory() could help, with getSRID(), but it is null
            // 
            // So we will use 0 which means Cartisian Coordinates aka don't know
            //
            // Only other thing we could do is ask for a geometry and see what it's
            // SRID number is?
            //
            //            ftConfig.setSRS(0);

            // attempt to get a better SRS
            try {
                CoordinateReferenceSystem crs = featureType.getDefaultGeometry()
                                                           .getCoordinateSystem();

                if (crs != null) {
                    Set idents = crs.getIdentifiers();
                    Iterator it = idents.iterator();

                    while (it.hasNext()) {
                        Identifier id = (Identifier) it.next();

                        if (id.toString().indexOf("EPSG:") != -1) // this should probably use the Citation, but this is easier!
                         {
                            //we have an EPSG #, so lets use it!
                            String str_num = id.toString().substring(id.toString().indexOf(':') + 1);
                            int num = Integer.parseInt(str_num);
                            ftConfig.setSRS(num);

                            break; // take the first EPSG
                        }
                    }
                }
            } catch (Exception e) {
                e.printStackTrace(); // not a big deal - we'll default to 0.
            }

            FeatureSource fs = dataStore.getFeatureSource(featureType.getTypeName());

            // TODO translate to lat long, pending
            //This should not be done by default, as it is an expensive operation.
            //especially for very large tables.  User may know it, if not he
            //can hit the generate button (which is why it's there).
            //ftConfig.setLatLongBBox(DataStoreUtils.getBoundingBoxEnvelope(fs));

            //Extent ex = featureType.getDefaultGeometry().getCoordinateSystem().getValidArea();
            //ftConfig.setLatLongBBox(ex);
        } catch (IOException e) {
            e.printStackTrace();

            if (e instanceof FileNotFoundException) {
                ActionErrors errors = new ActionErrors();
                errors.add(ActionErrors.GLOBAL_ERROR,
                    new ActionError("error.exception", "File not found: " + e.getMessage()));
                saveErrors(request, errors);

                return mapping.findForward("config.data.type.new");
            }

            ActionErrors errors = new ActionErrors();
            errors.add(ActionErrors.GLOBAL_ERROR, new ActionError("error.exception", e.getMessage()));

            saveErrors(request, errors);

            return mapping.findForward("config.data.type.new");
        } finally {
            if(dataStore != null) dataStore.dispose();
        }

        request.getSession().setAttribute(DataConfig.SELECTED_FEATURE_TYPE, ftConfig);
        request.getSession().removeAttribute(DataConfig.SELECTED_ATTRIBUTE_TYPE);

        user.setFeatureTypeConfig(ftConfig);

        return mapping.findForward("config.data.type.editor");
    }
}