Application: gvSIG desktop

package org.gvsig.example.postgis;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.ResultSet;

import java.sql.ResultSetMetaData;

import java.sql.SQLException;

import java.sql.Statement;

import javax.swing.JOptionPane;

import org.cresques.cts.ICoordTrans;

import org.cresques.cts.IProjection;

import com.hardcode.driverManager.DriverLoadException;

import com.iver.andami.PluginServices;

import com.iver.andami.plugins.Extension;

import com.iver.andami.ui.mdiManager.IWindow;

import com.iver.cit.gvsig.fmap.MapControl;

import com.iver.cit.gvsig.fmap.ViewPort;

import com.iver.cit.gvsig.fmap.core.ICanReproject;

import com.iver.cit.gvsig.fmap.crs.CRSFactory;

import com.iver.cit.gvsig.fmap.drivers.DBLayerDefinition;

import com.iver.cit.gvsig.fmap.drivers.VectorialJDBCDriver;

import com.iver.cit.gvsig.fmap.layers.FLayer;

import com.iver.cit.gvsig.fmap.layers.FLyrVect;

import com.iver.cit.gvsig.fmap.layers.LayerFactory;

import com.iver.cit.gvsig.project.documents.view.gui.View;

public class LoadLayer extends Extension {

        public void initialize() {

        }

        public void execute(String actionCommand) {

                // IN CONFIG.XML, the actionCommand should be the layer name. (table name)

                View v = (View) PluginServices.getMDIManager().getActiveWindow();

                MapControl mapCtrl = v.getMapControl();

        String dbURL = "jdbc:postgresql://localhost:5432/latin1"; // latin1 is the catalog name

        String user = "postgres";

        String pwd = "aquilina";

        String layerName = actionCommand;

        String tableName = actionCommand;

        Connection conn;

                try {

                        conn = DriverManager.getConnection(dbURL, user, pwd);

                conn.setAutoCommit(false);

                String fidField = "gid"; // BE CAREFUL => MAY BE NOT!!!

                String geomField = "the_geom"; // BE CAREFUL => MAY BE NOT!!! => You should read table GEOMETRY_COLUMNS.

                                                                                // See PostGIS help.

                // To obtain the fields, make a connection and get them.

                        Statement st = conn.createStatement();

                        ResultSet rs = st.executeQuery("select * from " + tableName + " LIMIT 1");

                        ResultSetMetaData rsmd = rs.getMetaData();

                        String[] fields = new String[rsmd.getColumnCount()-1]; // We don't want to include the_geom field

                        int j = 0;

                        for (int i = 0; i < fields.length; i++) {

                                if (!rsmd.getColumnName(i+1).equalsIgnoreCase(geomField))

                                {

                                        fields[j++] = rsmd.getColumnName(i+1);

                                }

                        }

                        rs.close();

                /* String[] fields = new String[1];

                fields[0] = "gid"; */

                String whereClause = "";

                VectorialJDBCDriver driver = (VectorialJDBCDriver) LayerFactory.getDM()

                                        .getDriver("PostGIS JDBC Driver");

                // Here you can set the workingArea

                // driver.setWorkingArea(dbLayerDefinition.getWorkingArea());

                String strEPSG = mapCtrl.getViewPort()

                            .getProjection().getAbrev()

                            .substring(5);

                DBLayerDefinition lyrDef = new DBLayerDefinition();

                lyrDef.setName(layerName);

                lyrDef.setTableName(tableName);

                lyrDef.setWhereClause(whereClause);

                lyrDef.setFieldNames(fields);

                lyrDef.setFieldGeometry(geomField);

                lyrDef.setFieldID(fidField);

                // if (dbLayerDefinition.getWorkingArea() != null)

                //     lyrDef.setWorkingArea(dbLayerDefinition.getWorkingArea());

                lyrDef.setSRID_EPSG(strEPSG);

                if (driver instanceof ICanReproject)

                {

                    ((ICanReproject)driver).setDestProjection(strEPSG);

                }

                driver.setData(conn, lyrDef);

                IProjection proj = null;

                if (driver instanceof ICanReproject)

                {

                    proj = CRSFactory.getCRS("EPSG:" + ((ICanReproject)driver).getSourceProjection());

                }

                FLayer lyr = LayerFactory.createDBLayer(driver, layerName, proj);

                        if (lyr != null) {

                                lyr.setVisible(true);

                                v.getMapControl().getMapContext().beginAtomicEvent();

                                // You shoud checkProjection to see if it is necesary to reproject

                    checkProjection(lyr, v.getMapControl().getViewPort());

                                v.getMapControl().getMapContext().getLayers()

                                           .addLayer(lyr);

                                v.getMapControl().getMapContext().endAtomicEvent();

                        }

                } catch (SQLException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                } catch (DriverLoadException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                }

        }

        public boolean isEnabled() {

                return true;

        }

        public boolean isVisible() {

                IWindow v = PluginServices.getMDIManager().getActiveWindow();

                if  (v instanceof View)

                        return true;

                else

                        return false;

        }

    private void checkProjection(FLayer lyr, ViewPort viewPort)

    {

        if (lyr instanceof FLyrVect)

        {

            FLyrVect lyrVect = (FLyrVect) lyr;

            IProjection proj = lyr.getProjection();

            // Comprobar que la projecci?n es la misma que la vista

            if (proj == null)

            {

                // SUPONEMOS que la capa est? en la proyecci?n que

                // estamos pidiendo (que ya es mucho suponer, ya).

                lyrVect.setProjection(viewPort.getProjection());

                return;

            }

            if (proj != viewPort.getProjection()) {

                int option = JOptionPane.showConfirmDialog(null,

                        PluginServices.getText(this, "reproyectar_aviso"),

                        PluginServices.getText(this, "reproyectar_pregunta"),

                        JOptionPane.YES_NO_OPTION);

                if (option == JOptionPane.NO_OPTION) {

                    return;

                } else {

                    ICoordTrans ct = proj.getCT(viewPort.getProjection());

                    lyrVect.setCoordTrans(ct);

                    System.err.println("coordTrans = " +

                        proj.getAbrev() + " " +

                        viewPort.getProjection().getAbrev());

                }

            }

        }

    }

}