source: josm/src/org/openstreetmap/josm/gui/BookmarkList.java@ 73

package org.openstreetmap.josm.gui;

import java.awt.Component;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.StringTokenizer;

import javax.swing.DefaultListCellRenderer;
import javax.swing.DefaultListModel;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.Preferences;
import org.openstreetmap.josm.tools.ImageProvider;

/**
 * List class that read and save its content from the bookmark file.
 * @author imi
 */
public class BookmarkList extends JList {

        /**
         * Class holding one bookmarkentry.
         * @author imi
         */
        public static class Bookmark {
                public String name;
                public double[] latlon = new double[4]; // minlat, minlon, maxlat, maxlon
                public boolean rawgps;
                @Override public String toString() {
                        return name;
                }
        }
        
        /**
         * Create a bookmark list as well as the Buttons add and remove.
         */
        public BookmarkList() {
                setModel(new DefaultListModel());
                load();
                setVisibleRowCount(7);
                setCellRenderer(new DefaultListCellRenderer(){
                        @Override
                        public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
                                Component c = super.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
                                if (c instanceof JLabel) {
                                        Bookmark b = (Bookmark)value;
                                        ((JLabel)c).setIcon(ImageProvider.get("layer/"+(b.rawgps?"rawgps_small":"osmdata_small")));
                                }
                                return c;
                        }
                });
        }

        /**
         * Loads the bookmarks from file.
         */
        public void load() {
                DefaultListModel model = (DefaultListModel)getModel();
                model.removeAllElements();
                File bookmarkFile = new File(Preferences.getPreferencesDir()+"bookmarks");
                try {
                        if (!bookmarkFile.exists())
                                bookmarkFile.createNewFile();
                        BufferedReader in = new BufferedReader(new FileReader(bookmarkFile));
                        
                        for (String line = in.readLine(); line != null; line = in.readLine()) {
                                StringTokenizer st = new StringTokenizer(line, ",");
                                if (st.countTokens() != 6)
                                        continue;
                                Bookmark b = new Bookmark();
                                b.name = st.nextToken();
                                try {
                                        for (int i = 0; i < b.latlon.length; ++i)
                                                b.latlon[i] = Double.parseDouble(st.nextToken());
                                        b.rawgps = Boolean.parseBoolean(st.nextToken());
                                        model.addElement(b);
                                } catch (NumberFormatException x) {
                                        // line not parsed
                                }
                        }
                        in.close();
                } catch (IOException e) {
                        JOptionPane.showMessageDialog(Main.main, "Could not read bookmarks.\n"+e.getMessage());
                }
        }

        /**
         * Save all bookmarks to the preferences file
         */
        public void save() {
                File bookmarkFile = new File(Preferences.getPreferencesDir()+"bookmarks");
                try {
                        if (!bookmarkFile.exists())
                                bookmarkFile.createNewFile();
                        PrintWriter out = new PrintWriter(new FileWriter(bookmarkFile));
                        DefaultListModel m = (DefaultListModel)getModel();
                        for (Object o : m.toArray()) {
                                Bookmark b = (Bookmark)o;
                                b.name.replace(',', '_');
                                out.print(b.name+",");
                                for (int i = 0; i < b.latlon.length; ++i)
                                        out.print(b.latlon[i]+",");
                                out.println(b.rawgps);
                        }
                        out.close();
                } catch (IOException e) {
                        JOptionPane.showMessageDialog(Main.main, "Could not write bookmark.\n"+e.getMessage());
                }
        }
}