Examples of org.eclipse.core.runtime.Preferences

org.eclipse.core.runtime.Preferences
A table of preference settings, mapping named properties to values. Property names are non-empty strings; property values can be either booleans, non-null strings, or values of one of the primitive number types. The table consists of two, sparse, layers: the lower layer holds default values for properties, and the upper layer holds explicitly set values for properties. Normal retrieval looks for an explicitly set value for the given property in the upper layer; if there is nothing for that property in the upper layer, it next looks for a default value for the given property in the lower layer; if there is nothing for that property in the lower layer, it returns a standard default-default value. The default-default values for the primitive types are as follows:
- boolean = false
- double = 0.0
- float = 0.0f
- int = 0
- long = 0L
- String = "" (the empty string)
Internally, all properties values (in both layers) are stored as strings. Standard conversions to and from numeric and boolean types are performed on demand.

The typical usage is to establish the defaults for all known properties and then restore previously stored values for properties whose values were explicitly set. The existing settings can be changed and new properties can be set (setValue). If the values specified is the same as the default value, the explicit setting is deleted from the top layer. It is also possible to reset a property value back to the default value using setToDefault. After the properties have been modified, the properties with explicit settings are written to disk. The default values are never saved. This two-tiered approach to saving and restoring property setting minimizes the number of properties that need to be persisted; indeed, the normal starting state does not require storing any properties at all. It also makes it easy to use different default settings in different environments while maintaining just those property settings the user has adjusted.

A property change event is reported whenever a property's value actually changes (either through setValue, setToDefault). Note, however, that manipulating default values (with setDefault) does not cause any events to be reported.

Clients may instantiate this class. This class was not designed to be subclassed.

The implementation is based on a pair of internal java.util.Properties objects, one holding explicitly set values (set using setValue), the other holding the default values (set using setDefaultValue). The load and store methods persist the non-default property values to streams (the default values are not saved).

If a client sets a default value to be equivalent to the default-default for that type, the value is still known to the preference store as having a default value. That is, the name will still be returned in the result of the defaultPropertyNames and contains methods.
@since 2.0

    setVnsPort(getCDEVnsPort());
  }


  private static String getUimaPrefString(String key, String defaultValue) {
    TAEConfiguratorPlugin plugin = TAEConfiguratorPlugin.getDefault();
    Preferences prefs = plugin.getPluginPreferences();
    boolean isDefault = prefs.isDefault(key);
    if (isDefault)
      prefs.setDefault(key, defaultValue);
    return prefs.getString(key);
  }

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    return prefs.getString(key);
  }


  private static boolean getUimaPrefBoolean(String key, boolean defaultValue) {
    TAEConfiguratorPlugin plugin = TAEConfiguratorPlugin.getDefault();
    Preferences prefs = plugin.getPluginPreferences();
    boolean isDefault = prefs.isDefault(key);
    if (isDefault)
      prefs.setDefault(key, defaultValue);
    return prefs.getBoolean(key);
  }

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    return prefs.getBoolean(key);
  }


  private static int getUimaPrefInt(String key, int defaultValue) {
    TAEConfiguratorPlugin plugin = TAEConfiguratorPlugin.getDefault();
    Preferences prefs = plugin.getPluginPreferences();
    boolean isDefault = prefs.isDefault(key);
    if (isDefault)
      prefs.setDefault(key, defaultValue);
    return prefs.getInt(key);
  }

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          }
        }
      }
    };


    Preferences p= ResourcesPlugin.getPlugin().getPluginPreferences();
    p.addPropertyChangeListener(fPropertyChangeListener);
  }

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  /**
   * Disposes this encoding support.
   */
  public void dispose() {
    Preferences p= ResourcesPlugin.getPlugin().getPluginPreferences();
    p.removePropertyChangeListener(fPropertyChangeListener);


    fTextEditor= null;
  }

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    super.createControl(parent);
    PlatformUI.getWorkbench().getHelpSystem().setHelp(getControl(), ITextEditorHelpContextIds.TEXT_EDITOR_PREFERENCE_PAGE);
  }


  protected Preferences getPreferences() {
    return new Preferences();
  }

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  }
  
  public void addRecentFile(String fileName, String menuID, String recentMenuID, String recentFilesKey, String menuLabel, PropertyChangeListener listener) {
    
    Plugin plugin = Activator.getDefault();
    Preferences prefs = plugin.getPluginPreferences();


    String recentFiles = prefs.getString(recentFilesKey);


    if (recentFiles == null) {
      recentFiles = "";
    }


    String[] recentFilesArray = recentFiles.split(";");
    String[] newFilesArray = new String[10];


    // put new file
    newFilesArray[0] = fileName;


    // move files
    for (int i = 0; i < 9; i++) {


      // check files
      if (i >= recentFilesArray.length) {
        break;
      }


      // check if file has not been already added
      if (!fileName.equals(recentFilesArray[i])) {
        newFilesArray[i + 1] = recentFilesArray[i];
      }
    }


    // now join
    recentFiles = "";
    for (String file : newFilesArray) {
      if (file != null && file != "") {
        recentFiles += file + ";";
      }
    }


    // store preference
    prefs.setValue(recentFilesKey, recentFiles);
    plugin.savePluginPreferences();
    
    // rebuild menu
    rebuildRecentFiles(menuID, recentMenuID, recentFilesKey, menuLabel, listener);
  }

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  }


  public String[] getRecentFiles(String recentFilesKey) {
    Plugin plugin = Activator.getDefault();
    Preferences prefs = plugin.getPluginPreferences();


    String recentFiles = prefs.getString(recentFilesKey);


    return recentFiles.split(";");
  }

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public class Control implements IStartup {


    public void earlyStartup ()
    {
        Preferences pref = Activator.getDefault().getPluginPreferences();
        if (pref.getBoolean(Activator.PrefAutoCheck)) {
            String awhome = pref.getString(Activator.PrefAWPath);
            if (awhome == null || awhome.length() == 0 || !new File(awhome).exists()) {
                Display.getDefault().asyncExec(new Runnable() {
                    public void run ()
                    {
                        PreferenceDialog pd = PreferencesUtil.createPreferenceDialogOn(

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        return ret;
    }


  public void updateAntHome ()
    {
        Preferences pref = Activator.getDefault().getPluginPreferences();


        String awhome = pref.getString(Activator.PrefAWPath);
        File anthome = new File(awhome, "tools/ant/");
        if (awhome.length() > 0 && anthome.exists()) {
            File antLib = new File(anthome, "lib");
            String[] antJars = antLib.list(new FilenameFilter() {
                public boolean accept (File dir, String name)

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