// docs start source
/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2006-2008, Open Source Geospatial Foundation (OSGeo)
*
* This file is hereby placed into the Public Domain. This means anyone is
* free to do whatever they wish with this file. Use it well and enjoy!
*/
package org.geotools.tutorial.filter;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.util.Map;
import javax.swing.ComboBoxModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableModel;
import org.geotools.data.DataStore;
import org.geotools.data.DataStoreFactorySpi;
import org.geotools.data.DataStoreFinder;
import org.geotools.data.Query;
import org.geotools.data.postgis.PostgisNGDataStoreFactory;
import org.geotools.data.shapefile.ShapefileDataStoreFactory;
import org.geotools.data.simple.SimpleFeatureCollection;
import org.geotools.data.simple.SimpleFeatureIterator;
import org.geotools.data.simple.SimpleFeatureSource;
import org.geotools.filter.text.cql2.CQL;
import org.geotools.swing.action.SafeAction;
import org.geotools.swing.data.JDataStoreWizard;
import org.geotools.swing.table.FeatureCollectionTableModel;
import org.geotools.swing.wizard.JWizard;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.type.FeatureType;
import org.opengis.filter.Filter;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.Point;
/**
* The Query Lab is an excuse to try out Filters and Expressions on your own data with a table to
* show the results.
* <p>
* Remember when programming that you have other options then the CQL parser, you can directly make
* a Filter using CommonFactoryFinder.getFilterFactory2(null).
*/
public class QueryLab extends JFrame {
private DataStore dataStore;
private JComboBox featureTypeCBox;
private JTable table;
private JTextField text;
public static void main(String[] args) throws Exception {
JFrame frame = new QueryLab();
frame.setVisible(true);
}
// docs end main
// docs start constructor
public QueryLab() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
getContentPane().setLayout(new BorderLayout());
text = new JTextField(80);
text.setText("include"); // include selects everything!
getContentPane().add(text, BorderLayout.NORTH);
table = new JTable();
table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
table.setModel(new DefaultTableModel(5, 5));
table.setPreferredScrollableViewportSize(new Dimension(500, 200));
JScrollPane scrollPane = new JScrollPane(table);
getContentPane().add(scrollPane, BorderLayout.CENTER);
JMenuBar menubar = new JMenuBar();
setJMenuBar(menubar);
JMenu fileMenu = new JMenu("File");
menubar.add(fileMenu);
featureTypeCBox = new JComboBox();
menubar.add(featureTypeCBox);
JMenu dataMenu = new JMenu("Data");
menubar.add(dataMenu);
pack();
// docs start file menu
fileMenu.add(new SafeAction("Open shapefile...") {
public void action(ActionEvent e) throws Throwable {
connect(new ShapefileDataStoreFactory());
}
});
fileMenu.add(new SafeAction("Connect to PostGIS database...") {
public void action(ActionEvent e) throws Throwable {
connect(new PostgisNGDataStoreFactory());
}
});
fileMenu.add(new SafeAction("Connect to DataStore...") {
public void action(ActionEvent e) throws Throwable {
connect(null);
}
});
fileMenu.addSeparator();
fileMenu.add(new SafeAction("Exit") {
public void action(ActionEvent e) throws Throwable {
System.exit(0);
}
});
// docs end file menu
// docs start data menu
dataMenu.add(new SafeAction("Get features") {
public void action(ActionEvent e) throws Throwable {
filterFeatures();
}
});
dataMenu.add(new SafeAction("Count") {
public void action(ActionEvent e) throws Throwable {
countFeatures();
}
});
dataMenu.add(new SafeAction("Geometry") {
public void action(ActionEvent e) throws Throwable {
queryFeatures();
}
});
// docs end data menu
dataMenu.add(new SafeAction("Center") {
public void action(ActionEvent e) throws Throwable {
centerFeatures();
}
});
}
// docs end constructor
// docs start connect
private void connect(DataStoreFactorySpi format) throws Exception {
JDataStoreWizard wizard = new JDataStoreWizard(format);
int result = wizard.showModalDialog();
if (result == JWizard.FINISH) {
Map<String, Object> connectionParameters = wizard.getConnectionParameters();
dataStore = DataStoreFinder.getDataStore(connectionParameters);
if (dataStore == null) {
JOptionPane.showMessageDialog(null, "Could not connect - check parameters");
}
updateUI();
}
}
// docs end connect
// docs start update
private void updateUI() throws Exception {
ComboBoxModel cbm = new DefaultComboBoxModel(dataStore.getTypeNames());
featureTypeCBox.setModel(cbm);
table.setModel(new DefaultTableModel(5, 5));
}
// docs end update
// docs start filterFeatures
private void filterFeatures() throws Exception {
String typeName = (String) featureTypeCBox.getSelectedItem();
SimpleFeatureSource source = dataStore.getFeatureSource(typeName);
Filter filter = CQL.toFilter(text.getText());
SimpleFeatureCollection features = source.getFeatures(filter);
FeatureCollectionTableModel model = new FeatureCollectionTableModel(features);
table.setModel(model);
}
// docs end filterFeatures
// docs start countFeatures
private void countFeatures() throws Exception {
String typeName = (String) featureTypeCBox.getSelectedItem();
SimpleFeatureSource source = dataStore.getFeatureSource(typeName);
Filter filter = CQL.toFilter(text.getText());
SimpleFeatureCollection features = source.getFeatures(filter);
int count = features.size();
JOptionPane.showMessageDialog(text, "Number of selected features:" + count);
}
// docs end countFeatures
// docs start queryFeatures
private void queryFeatures() throws Exception {
String typeName = (String) featureTypeCBox.getSelectedItem();
SimpleFeatureSource source = dataStore.getFeatureSource(typeName);
FeatureType schema = source.getSchema();
String name = schema.getGeometryDescriptor().getLocalName();
Filter filter = CQL.toFilter(text.getText());
Query query = new Query(typeName, filter, new String[] { name });
SimpleFeatureCollection features = source.getFeatures(query);
FeatureCollectionTableModel model = new FeatureCollectionTableModel(features);
table.setModel(model);
}
// docs end queryFeatures
// docs start centerFeatures
private void centerFeatures() throws Exception {
String typeName = (String) featureTypeCBox.getSelectedItem();
SimpleFeatureSource source = dataStore.getFeatureSource(typeName);
Filter filter = CQL.toFilter(text.getText());
FeatureType schema = source.getSchema();
String name = schema.getGeometryDescriptor().getLocalName();
Query query = new Query(typeName, filter, new String[] { name });
SimpleFeatureCollection features = source.getFeatures(filter);
double totalX = 0.0;
double totalY = 0.0;
long count = 0;
SimpleFeatureIterator iterator = features.features();
try {
while (iterator.hasNext()) {
SimpleFeature feature = iterator.next();
Geometry geom = (Geometry) feature.getDefaultGeometry();
Point centroid = geom.getCentroid();
totalX += centroid.getX();
totalY += centroid.getY();
count++;
}
} finally {
iterator.close(); // IMPORTANT
}
double averageX = totalX / (double) count;
double averageY = totalY / (double) count;
Coordinate center = new Coordinate(averageX, averageY);
JOptionPane.showMessageDialog(text, "Center of selected features:" + center);
}
// docs end centerFeatures
}
// docs end source