source: josm/src/org/openstreetmap/josm/gui/BookmarkList.java@ 153

package org.openstreetmap.josm.gui;

import static org.openstreetmap.josm.tools.I18n.tr;

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

import org.openstreetmap.josm.Main;

/**
 * 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
                @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);
        }

        /**
         * Loads the bookmarks from file.
         */
        public void load() {
                DefaultListModel model = (DefaultListModel)getModel();
                model.removeAllElements();
                File bookmarkFile = new File(Main.pref.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() != 5)
                                        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());
                                        model.addElement(b);
                                } catch (NumberFormatException x) {
                                        // line not parsed
                                }
                        }
                        in.close();
                } catch (IOException e) {
                        JOptionPane.showMessageDialog(Main.parent, tr("Could not read bookmarks.")+"\n"+e.getMessage());
                }
        }

        /**
         * Save all bookmarks to the preferences file
         */
        public void save() {
                File bookmarkFile = new File(Main.pref.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]+(i<b.latlon.length-1?",":""));
                                out.println();
                        }
                        out.close();
                } catch (IOException e) {
                        JOptionPane.showMessageDialog(Main.parent,tr("Could not write bookmark.")+"\n"+e.getMessage());
                }
        }
}