Geonames location searcher for OpenMap

Here is an integration of openmap with geonames that will add a combobox that can be used to search geonames.org to the toolbar by adding the following to your openmap.properties file:

openmap.components=... geonamessearcher
geonamessearcher.class=GeoNamesSearcher

Here is the code

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.DefaultComboBoxModel;
import javax.swing.DefaultListCellRenderer;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JList;
import javax.swing.plaf.basic.BasicComboBoxEditor;

import net.miginfocom.swing.MigLayout;

import org.apache.log4j.Logger;
import org.geonames.Toponym;
import org.geonames.ToponymSearchCriteria;
import org.geonames.ToponymSearchResult;
import org.geonames.WebService;

import com.bbn.openmap.event.CenterListener;
import com.bbn.openmap.event.CenterSupport;
import com.bbn.openmap.gui.OMToolComponent;

public class GeoNamesSearcher extends OMToolComponent {

 private static final Logger log = Logger.getLogger(GeoNamesSearcher.class
   .getName());

 private JComboBox searchBox;

 private CenterSupport centerDelegate;

 private DefaultComboBoxModel searchBoxModel = new DefaultComboBoxModel();

 public GeoNamesSearcher() {
  centerDelegate = new CenterSupport(this);
  setLayout(new MigLayout());
  searchBox = new JComboBox(searchBoxModel);
  searchBox.setEditable(true);
  searchBox.setMaximumRowCount(25);
  searchBox
    .setToolTipText("Enter part of location to search for (and center to).");
  searchBox.setRenderer(new DefaultListCellRenderer() {
   @Override
   public JComponent getListCellRendererComponent(JList list,
     Object value, int index, boolean isSelected,
     boolean cellHasFocus) {
    super.getListCellRendererComponent(list, value, index,
      isSelected, cellHasFocus);
    if (value instanceof Toponym) {
     Toponym toponym = (Toponym) value;
     setText(toponym.getName() + " " + toponym.getCountryCode());
    }
    return this;
   }
  });
  searchBox.setEditor(new BasicComboBoxEditor() {
   @Override
   public void setItem(Object anObject) {
    if (anObject != null) {
     if (anObject instanceof Toponym) {
      Toponym toponym = (Toponym) anObject;
      editor.setText(toponym.getName() + " "
        + toponym.getCountryCode());
      // oldValue = anObject;
     } else {
      super.setItem(anObject);
     }
    } else {
     editor.setText("");
    }
   }
  });


  searchBox.addActionListener(new ActionListener() {
   @Override
   public void actionPerformed(ActionEvent evt) {
    JComboBox cb = (JComboBox) evt.getSource();

    Object selectedItem = cb.getSelectedItem();

    if ("comboBoxEdited".equals(evt.getActionCommand())) {
     // User has typed in a string; only possible with an
     // editable combobox
     try {
      searchBoxModel.removeAllElements();
      ToponymSearchCriteria searchCriteria = new ToponymSearchCriteria();
      // searchCriteria.setCountryCode("DK");
      searchCriteria.setQ((String) selectedItem);
      ToponymSearchResult searchResult = WebService
        .search(searchCriteria);
      for (Toponym toponym : searchResult.getToponyms()) {
       searchBoxModel.addElement(toponym);
      }
      if (searchResult.getTotalResultsCount() == 1) {
       Toponym t = searchResult.getToponyms().get(0);
       centerDelegate.fireCenter(t.getLatitude(), t
         .getLongitude());
      } else if (searchResult.getTotalResultsCount() > 1) {
       searchBox.showPopup();
      }
     } catch (Exception e) {
      log.error("", e);
     }

    } else if ("comboBoxChanged".equals(evt.getActionCommand())) {
     // User has selected an item; it may be the same item
     if (cb.getSelectedItem() instanceof Toponym) {
      Toponym newItem = (Toponym) cb.getSelectedItem();
      centerDelegate.fireCenter(newItem.getLatitude(),
        newItem.getLongitude());
     }
    }

   }
  });
  add(searchBox);
 }

 public synchronized void addCenterListener(CenterListener listener) {
  centerDelegate.add(listener);
 }

 /**
  * Remove a CenterListener
  *
  * @param listener
  *            CenterListener
  */
 public synchronized void removeCenterListener(CenterListener listener) {
  centerDelegate.remove(listener);
 }

 @Override
 public void findAndInit(Object obj) {
  if (obj instanceof CenterListener) {
   addCenterListener((CenterListener) obj);
  }
 }

 @Override
 public void findAndUndo(Object obj) {
  if (obj instanceof CenterListener) {
   removeCenterListener((CenterListener) obj);
  }
 }
}