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Preferences.java

// License: GPL. Copyright 2007 by Immanuel Scholz and others
package org.openstreetmap.josm.data;

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.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.Map;
import java.util.SortedMap;
import java.util.StringTokenizer;
import java.util.TreeMap;
import java.util.Map.Entry;

import org.openstreetmap.josm.Main;


/**
 * This class holds all preferences for JOSM.
 * 
 * Other classes can register their beloved properties here. All properties will be
 * saved upon set-access.
 * 
 * @author imi
 */
00030 public class Preferences {

      public static interface PreferenceChangedListener {
            void preferenceChanged(String key, String newValue);
      }

      /**
       * Class holding one bookmarkentry.
       * @author imi
       */
00040       public static class Bookmark {
            public String name;
            public double[] latlon = new double[4]; // minlat, minlon, maxlat, maxlon
            @Override public String toString() {
                  return name;
            }
      }

      public final ArrayList<PreferenceChangedListener> listener = new ArrayList<PreferenceChangedListener>();

      /**
       * Map the property name to the property object.
       */
00053       protected final SortedMap<String, String> properties = new TreeMap<String, String>();

      /**
       * Override some values on read. This is intended to be used for technology previews
       * where we want to temporarily modify things without changing the user's preferences
       * file.
       */
00060       protected static final SortedMap<String, String> override = new TreeMap<String, String>();
      static {
            //override.put("osm-server.version", "0.5");
            //override.put("osm-server.additional-versions", "");
            //override.put("osm-server.url", "http://openstreetmap.gryph.de/api");
            //override.put("plugins", null);
      }

      /**
       * Return the location of the user defined preferences file
       */
00071       public String getPreferencesDir() {
            if (System.getenv("APPDATA") != null)
                  return System.getenv("APPDATA")+"/JOSM/";
            return System.getProperty("user.home")+"/.josm/";
      }

      /**
       * @return A list of all existing directories, where resources could be stored.
       */
00080       public Collection<String> getAllPossiblePreferenceDirs() {
          LinkedList<String> locations = new LinkedList<String>();
        locations.add(Main.pref.getPreferencesDir());
        String s;
        if ((s = System.getenv("JOSM_RESOURCES")) != null) {
            if (!s.endsWith("/") && !s.endsWith("\\"))
                  s = s + "/";
            locations.add(s);
        }
        if ((s = System.getProperty("josm.resources")) != null) {
            if (!s.endsWith("/") && !s.endsWith("\\"))
                  s = s + "/";
            locations.add(s);
        }
            String appdata = System.getenv("APPDATA");
            if (System.getenv("ALLUSERSPROFILE") != null && appdata != null && appdata.lastIndexOf("\\") != -1) {
                  appdata = appdata.substring(appdata.lastIndexOf("\\"));
                  locations.add(System.getenv("ALLUSERSPROFILE")+appdata+"/JOSM/");
            }
            locations.add("/usr/local/share/josm/");
            locations.add("/usr/local/lib/josm/");
            locations.add("/usr/share/josm/");
            locations.add("/usr/lib/josm/");
          return locations;
      }


      synchronized public boolean hasKey(final String key) {
            return override.containsKey(key) ? override.get(key) != null : properties.containsKey(key);
      }
      synchronized public String get(final String key) {
            if (override.containsKey(key))
                  return override.get(key);
            if (!properties.containsKey(key))
                  return "";
            return properties.get(key);
      }
      synchronized public String get(final String key, final String def) {
            if (override.containsKey(key)) 
                  return override.get(key);
            final String prop = properties.get(key);
            if (prop == null || prop.equals(""))
                  return def;
            return prop;
      }
      synchronized public Map<String, String> getAllPrefix(final String prefix) {
            final Map<String,String> all = new TreeMap<String,String>();
            for (final Entry<String,String> e : properties.entrySet())
                  if (e.getKey().startsWith(prefix))
                        all.put(e.getKey(), e.getValue());
            for (final Entry<String,String> e : override.entrySet())
                  if (e.getKey().startsWith(prefix))
                        if (e.getValue() == null)
                              all.remove(e.getKey());
                        else
                              all.put(e.getKey(), e.getValue());
            return all;
      }
      
      synchronized public boolean getBoolean(final String key) {
            return getBoolean(key, false);
      }
      synchronized public boolean getBoolean(final String key, final boolean def) {
            if (override.containsKey(key))
                  return override.get(key) == null ? def : Boolean.parseBoolean(override.get(key));
            return properties.containsKey(key) ? Boolean.parseBoolean(properties.get(key)) : def;
      }

      synchronized public void put(final String key, final String value) {
            if (value == null)
                  properties.remove(key);
            else
                  properties.put(key, value);
            save();
            firePreferenceChanged(key, value);
      }
      synchronized public void put(final String key, final boolean value) {
            properties.put(key, Boolean.toString(value));
            save();
            firePreferenceChanged(key, Boolean.toString(value));
      }

      private final void firePreferenceChanged(final String key, final String value) {
            for (final PreferenceChangedListener l : listener)
                  l.preferenceChanged(key, value);
      }

      /**
       * Called after every put. In case of a problem, do nothing but output the error
       * in log.
       */
00171       public void save() {
            try {
                  final PrintWriter out = new PrintWriter(new FileWriter(getPreferencesDir() + "preferences"), false);
                  for (final Entry<String, String> e : properties.entrySet()) {
                        if (!e.getValue().equals(""))
                              out.println(e.getKey() + "=" + e.getValue());
                  }
                  out.close();
            } catch (final IOException e) {
                  e.printStackTrace();
                  // do not message anything, since this can be called from strange
                  // places.
            }           
      }

      public void load() throws IOException {
            properties.clear();
            final BufferedReader in = new BufferedReader(new FileReader(getPreferencesDir()+"preferences"));
            int lineNumber = 0;
            ArrayList<Integer> errLines = new ArrayList<Integer>();
            for (String line = in.readLine(); line != null; line = in.readLine(), lineNumber++) {
                  final int i = line.indexOf('=');
                  if (i == -1 || i == 0) {
                        errLines.add(lineNumber);
                        continue;
                  }
                  properties.put(line.substring(0,i), line.substring(i+1));
            }
            if (!errLines.isEmpty()) {
                  throw new IOException("Malformed config file at lines " + errLines);
            }
      }

      public final void resetToDefault() {
            properties.clear();
            properties.put("projection", "org.openstreetmap.josm.data.projection.Epsg4326");
            properties.put("draw.segment.direction", "true");
            properties.put("draw.wireframe", "false");
            properties.put("layerlist.visible", "true");
            properties.put("propertiesdialog.visible", "true");
            properties.put("selectionlist.visible", "true");
            properties.put("commandstack.visible", "true");
            properties.put("osm-server.url", "http://www.openstreetmap.org/api");
            if (System.getProperty("os.name").toUpperCase().indexOf("WINDOWS") == -1) {
                  properties.put("laf", "javax.swing.plaf.metal.MetalLookAndFeel");
            } else {
                  properties.put("laf", "com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            }
            save();
      }

      public Collection<Bookmark> loadBookmarks() throws IOException {
            File bookmarkFile = new File(getPreferencesDir()+"bookmarks");
            if (!bookmarkFile.exists())
                  bookmarkFile.createNewFile();
            BufferedReader in = new BufferedReader(new FileReader(bookmarkFile));

            Collection<Bookmark> bookmarks = new LinkedList<Bookmark>();
            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());
                        bookmarks.add(b);
                  } catch (NumberFormatException x) {
                        // line not parsed
                  }
            }
            in.close();
            return bookmarks;
      }

      public void saveBookmarks(Collection<Bookmark> bookmarks) throws IOException {
            File bookmarkFile = new File(Main.pref.getPreferencesDir()+"bookmarks");
            if (!bookmarkFile.exists())
                  bookmarkFile.createNewFile();
            PrintWriter out = new PrintWriter(new FileWriter(bookmarkFile));
            for (Bookmark b : bookmarks) {
                  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();
      }
}

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